PI34xx-00

Cool-Power®
PI34xx-00
8 V to 18 Vin, 15 A Cool-Power ZVS Buck Regulator
Product Description
Features & Benefits
The PI34xx-00 is a family of high efficiency DC-DC ZVS-Buck
regulators integrating the controller, power switches and
support components within a high density
System-in-Package (SiP).
• High Efficiency ZVS-Buck Topology
The PI34xx-00 is designed to achieve optimum efficiency at
low input voltage ranges (8 V to 18 V). The utilization of zero
current soft turn-on provided by the high performance ZVS
topology within the PI34xx-00 series increases point of load
performance, providing best in class power efficiency with
high throughput power.
The PI34xx-00 requires only an external inductor and
minimal capacitors to form a complete DC-DC switching
mode buck regulator.
• Input voltage range of 8 V to 18 V
• Very-Fast transient response
• Power-up into pre-biased load
• High accuracy pre-trimmed output voltage
• User adjustable soft-start & tracking
• Parallel capable with single wire current sharing
• Input Over/Undervoltage Lockout (OVLO/UVLO)
• Output Overvoltage Protection (OVP)
• Overtemperature Protection (OTP)
• Fast and slow current limits
• -40°C to 125°C operating range (TJ)
Output Voltage
Device
IOUT Max
Set
Range
PI3420-00-LGIZ
1.0 V
1.0 V to 1.4 V
15 A
PI3421-00-LGIZ
1.8 V
1.4 V to 2.0 V
15 A
PI3422-00-LGIZ
2.5 V
2.0 V to 3.1 V
15 A
PI3423-00-LGIZ
3.3 V
2.3 V to 4.1 V
15 A
PI3424-00-LGIZ
5.0 V
3.3 V to 6.5 V
15 A
The ZVS architecture enables high frequency operation while
minimizing switching losses and maximizing efficiency. The
high switching frequency operation reduces the size of the
external filtering components, improves power density, and
enables very fast dynamic response to line and load
transients.
Applications
• High efficiency systems
• Computing, Communications, Industrial,
Automotive Equipment
Package Information
• 10 mm x 14 mm x 2.6 mm LGA SiP
The ZVS architecture enables operation up to 750 kHz while
minimizing switching losses and the use of variable frequency
extends high efficiency over a very wide dynamic range. The
PI34xx-00 series has a minimum on time of 20ns which
enables large step down conversion ratios.
Cool-Power®
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PI34xx-00
Contents
Contents
Page
Contents
Application Description
Page
23
Order Information
3
Thermal, Storage, and Handling Information
3
Output Voltage Trim
23
Absolute Maximum Ratings
4
Soft-Start Adjust and Tracking
24
Functional Block Diagram
4
Inductor Pairing
25
Pin Description
5
Thermal Derating
25
Package Pin-Out
5
Filter Considerations
25
PI3420-00-LGIZ Electrical Characteristics
6
Layout Guidelines
26
PI3421-00-LGIZ Electrical Characteristics
9
Recommended PCB Footprint and Stencil
27
PI3422-00-LGIZ Electrical Characteristics
12
Package Drawings
28
PI3423-00-LGIZ Electrical Characteristics
15
Revision History
29
PI3424-00-LGIZ Electrical Characteristics
18
Warranty
30
Thermal Derating Curves
21
Functional Description
22
ENABLE
22
Remote Sensing
22
Switching Frequency Synchronization
22
Soft-Start
22
Output Voltage Trim
22
Output Current Limit Protection
22
Input Undervoltage Lockout
22
Input Overvoltage Lockout
22
Output Ovevoltage Protection
23
Overtemperature Protection
23
Parallel Operation
23
Pulse Skip Mode (PSM)
23
Variable Frequency Operation
23
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PI34xx-00
Order Information
Cool-Power
Output Range
IOUT Max
Package
Transport
Media
Set
Range
PI3420-00-LGIZ
1.0 V
1.0 to 1.4 V
15 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3421-00-LGIZ
1.8 V
1.4 to 2.0 V
15 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3422-00-LGIZ
2.5 V
2.0 to 3.1 V
15 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3423-00-LGIZ
3.3 V
2.3 to 4.1 V
15 A
10 mm x 14 mm 123-pin LGA
TRAY
PI3424-00-LGIZ
5.0 V
3.3 to 6.5 V
15 A
10 mm x 14 mm 123-pin LGA
TRAY
Thermal, Storage, and Handling Information
Name
Rating
Storage Temperature
-65°C to 150°C
Operating Junction Temperature
-40°C to 125°C
Soldering Temperature for 20 seconds
245°C
MSL Rating
2 kV HBM
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800 927.9474
PI34xx-00
Absolute Maximum Ratings
Name
Rating
VIN
-0.7 V to 22 V
VS1
-0.7 to 22 V, 25 V for 5 ns, -4 V for 5 ns
VOUT
See relevant product section
SGND
100 mA
PGD, SYNCO, SYNCI, EN, EAO, ADJ, TRK, ADR1, ADR2, SCL, SDA, REM
-0.3 V to 5.5 V / 5 mA
Notes: At 25°C ambient temperature. Stresses beyond these limits may cause permanent damage to the device. Operation at these conditions or conditions
beyond those listed in the Electrical Characteristics is not guaranteed. All voltage nodes are referenced to PGND unless otherwise noted. Test conditions are
per the specifications within the individual product Electrical Characteristics.
Functional Block Diagram
Vin
VS1
VIN
Q2
Q1
VOUT
R4
REM
Power
Control
R1
VCC
ZVS Control
SYNCO
SYNCI
PGD
EN
PGND
Memory
ADJ
+
1V R2
Interface
0Ω
ADR1
SDA
ADR0
SCL
SGND
Simplified Block Diagram (I2C pins SCL, SDA, ADR0, and ADR1 are for factory use only. Not for use in application.)
Cool-Power®
Rev 1.2
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EAO
TRK
Vout
PI34xx-00
Pin Description
Name
Location
Description
SGND
Block 1
Signal ground: Internal logic ground for EA, TRK, SYNCI, SYNCO and ADJ. SGND and PGND are star connected
within the regulator package.
PGND
Block 2
Power ground: VIN and VOUT power returns.
VIN
Block 3
Input voltage: and sense for UVLO, OVLO and feed forward ramp.
VOUT
Block 5
Output voltage: and sense for power switches and feed-forward ramp.
VS1
Block 4
Switching node: and ZVS sense for power switches.
PGD
A1
Parallel Good: Used for parallel timing management intended for lead regulator.
EAO
A2
Error amp output: External connection for additional compensation and current sharing.
EN
A3
Enable Input: Regulator enable control. Asserted high or left floating – regulator enabled; Asserted low,
regulator output disabled.
REM
A5
Remote Sense: High side connection. Connect to output regulation point.
ADJ
B1
Adjust input: An external resistor may be connected between ADJ pin and SGND or VOUT to trim the output
voltage up or down.
TRK
C1
Soft-start and track input: An external capacitor may be connected between TRK pin and SGND to decrease
the rate of rise during soft-start.
NC
K3, A4
SYNCO
K4
Synchronization output: Outputs a high signal for ½ of the minimum period for synchronization of other
regulators.
SYNCI
K5
Synchronization input: Synchronize to the falling edge of external clock frequency. SYNCI is a high
impedance digital input node and should always be connected to SGND when not in use.
SDA
D1
Data Line: Connect to SGND. Factory use only. Not for use in application.
SCL
E1
Clock Line: Connect to SGND. Factory use only. Not for use in application.
ADR1
H1
Tri-state Address: No connect. Factory use only. Not for use in application.
ADR0
G1
Tri-state Address: No connect. Factory use only. Not for use in application.
No Connect: Leave pins floating.
SYNCO
2
SYNCI
1
NC
123-Lead LGA (10mmx 14mm)
Top View
Package Pin-Out
3
4
5
6
7
PGND
Block 2
8
9
10
11
12
13
14
SGND K
Block 1
J
VIN
Block 3
ADR1 H
Block 1:
B2-4, C2-4, D2-3, E2-3, F1-3, G2-3, H2-3, J1-3, K1-2
Block 2:
A8-10, B8-10, C8-10, D8-10, E4-10, F4-10, G4-10, H4-10, J4-10, K6-10
Block 3:
G12-14, H12-14, J12-14, K12-14
Block 4:
A12-14, B12-14, C12-14, D12-14, E12-14,
Block 5:
A6-7, B6-7, C6-7, D6-7
ADR0 G
SGND F
SCL E
SDA D
TRK C
VS1
Block 4
ADJ B
PGD A
REM
NC
EN
EAO
VOUT
Block 5
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Rev 1.2
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09/2015
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PI34xx-00
PI3420-00-LGIZ (1.0 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 85 nH (Note 1) unless other conditions are noted.
Parameter
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
Symbol
Conditions
VIN_DC
IIN_DC
Input Specifications
Minimum 1 mA load required
VIN = 12 V, TC = 25°C, IOUT = 15 A
IIN_Short
Note [2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Specifications
Note [2]
Note [3]
@25°C, 8 V <VIN <18 V
@25°C, 0.5 A <IOUT <15 A
IOUT = 7.5 A, COUT = 8 x100µF, 20 MHz BW, Note [4]
UVLO Start Threshold
UVLO Stop Hysteresis
UVLO Stop Threshold
OVLO Start Hysteresis
UVLO/OVLO Fault Delay Time
UVLO/OVLO Response Time
Output Overvoltage Protection
Over-Temperature Fault Threshold
Over-Temperature Restart Hysteresis
Protection
VUVLO_START
VUVLO_HYS
VOVLO
VOVLO_HYS
tf_DLY
Number of the switching frequency cycles
tf
+1% overdrive
VOVP
Above Set VOUT
TOTP
TOTP_HYS
[3]
[4]
[5]
[6]
Max
Unit
8
12
1.437
18
V
A
10
mA
2.6
4
VOUT_DC
VOUT_DC
∆VOUT(∆VIN)
∆VOUT(∆IOUT)
VOUT_AC
IOUT_DC
IOUT_CL
[2]
Typ
Disabled
Enabled (no load)
Note [2]
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
[1]
Min
0.987
1.0
1.0
mA
1
V/µs
1.013
1.4
V
V
%
%
mVp-p
A
A
0.10
0.20
27
0.001
15
18
7.20
4
19.71
1.56
130
7.60
5
20.75
1.83
128
500
20
135
30
8.00
6
21.78
2.1
140
V
V
V
V
Cycles
ns
%
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Cool-Power®
Rev 1.2
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Page 6 of 30
09/2015
800 927.9474
PI34xx-00
PI3420-00-LGIZ (1.0 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 85 nH (Note 1) unless other conditions are noted.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
∆fSYNCI
VSYNCI
Note [6]
600
30
Sync In (SYNCI)
Relative to set switching frequency. Note [3]
50
kHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft–Start)
Discharge Current (Fault)
Soft-Start Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
VTRK
VTRK_MAX
VTRK_OV
ITRK
ITRK_DIS
tSS
Source 1mA
Sink 1mA
20pF load
20pF load
4.5
0.5
10
10
Soft Start And Tracking
Internal reference tracking range.
0
20
-70
CTRK = 0uF
1.2
1.2
40
-50
6.8
2.2
V
V
ns
ns
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
[1]
[2]
[3]
[4]
[5]
[6]
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Cool-Power®
Rev 1.2
vicorpower.com
Page 7 of 30
09/2015
800 927.9474
PI34xx-00
PI3420-00-LGIZ (1.0 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency %
90
85
80
8 Vin
12 Vin
18 Vin
75
70
65
60
55
50
0
1
2
4
3
5
6
7
9
8
10
11
12
13
14
15
IOUT (A)
Figure 1 — Regulator and inductor performance
Figure 4 — 12 VIN to 1.0 VOUT, COUT = 8 X 100 µF Ceramic
VOUT (Ch4) = 100 mV/Div, IOUT (Ch1) = 10 A/Div, 100 µS/Div
Figure 2 — VOUT (Ch1) = 500 mV/Div, IIN (Ch4) = 1 A/Div, 800 µs/Div
Figure 5 — COUT = 8 X 100 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Switching Frequency vs. Load Current
Switching Frequency (kHz)
800
700
600
500
8 Vin
12 Vin
18 Vin
400
300
200
100
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
IOUT (A)
Figure 6 — COUT = 8 X 100 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Figure 3 — Switching Frequency vs. Load Current
Cool-Power®
Rev 1.2
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Page 8 of 30
09/2015
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PI34xx-00
PI3421-00-LGIZ (1.8 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 125 nH (Note 1) unless other conditions are noted.
Parameter
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
Symbol
Conditions
VIN_DC
IIN_DC
Input Specifications
Minimum 1 mA load required
VIN = 12 V, TC = 25°C, IOUT = 15 A
IIN_Short
Note [2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Specifications
Note [2]
Note [3]
@25°C, 8 V <VIN <18 V
@25°C, 0.5 A <IOUT <15 A
IOUT = 7.5 A, COUT = 8 x100µF, 20 MHz BW, Note [4]
UVLO Start Threshold
UVLO Stop Hysteresis
UVLO Stop Threshold
OVLO Start Hysteresis
UVLO/OVLO Fault Delay Time
UVLO/OVLO Response Time
Output Overvoltage Protection
Over-Temperature Fault Threshold
Over-Temperature Restart Hysteresis
Protection
VUVLO_START
VUVLO_HYS
VOVLO
VOVLO_HYS
tf_DLY
Number of the switching frequency cycles
tf
+1% overdrive
VOVP
Above Set VOUT
TOTP
TOTP_HYS
[3]
[4]
[5]
[6]
Max
Unit
8
12
2.46
18
V
A
10
mA
2.6
4.3
VOUT_DC
VOUT_DC
∆VOUT(∆VIN)
∆VOUT(∆IOUT)
VOUT_AC
IOUT_DC
IOUT_CL
[2]
Typ
Disabled
Enabled (no load)
Note [2]
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
[1]
Min
1.776
1.4
1.8
1.8
0.10
0.20
20.2
mA
1
V/µs
1.823
2.0
V
V
%
%
mVp-p
A
A
15
18
7.20
4
19.71
1.56
130
7.60
5
20.75
1.83
128
500
20
135
30
8.00
6
21.78
2.1
140
V
V
V
V
Cycles
ns
%
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Cool-Power®
Rev 1.2
vicorpower.com
Page 9 of 30
09/2015
800 927.9474
PI34xx-00
PI3421-00-LGIZ (1.8 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 125 nH (Note 1) unless other conditions are noted.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
∆fSYNCI
VSYNCI
Note [6]
550
30
Sync In (SYNCI)
Relative to set switching frequency. Note [3]
50
kHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft–Start)
Discharge Current (Fault)
Soft-Start Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
VTRK
VTRK_MAX
VTRK_OV
ITRK
ITRK_DIS
tSS
Source 1mA
Sink 1mA
20pF load
20pF load
4.5
0.5
10
10
Soft Start And Tracking
Internal reference tracking range.
0
20
-70
CTRK = 0uF
1.2
1.2
40
-50
6.8
2.2
V
V
ns
ns
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
[1]
[2]
[3]
[4]
[5]
[6]
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Cool-Power®
Rev 1.2
vicorpower.com
Page 10 of 30
09/2015
800 927.9474
PI34xx-00
PI3421-00-LGIZ (1.8 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency %
90
85
80
8 Vin
12 Vin
18 Vin
75
70
65
60
55
50
0
1
2
4
3
5
6
7
9
8
10
11
12
13
14
15
IOUT (A)
Figure 7 — Regulator and inductor performance
Figure 10 — 12 VIN to 1.8 VOUT, COUT = 8 X 100 µF Ceramic
VOUT (Ch2) = 100 mV/Div, IIN (Ch1) = 10 A/Div, 100 µS/Div
Figure 8 — VOUT (Ch1) = 1V/Div, IIN (Ch4) = 2 A/Div, 800 µs/Div
Figure 11 — COUT = 8 X 100 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Switching Frequency vs. Load Current
Switching Frequency (kHz)
800
700
600
500
8 Vin
12 Vin
18 Vin
400
300
200
100
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
IOUT (A)
Figure 12 — COUT = 8 X 100 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Figure 9 — Switching Frequency vs. Load Current
Cool-Power®
Rev 1.2
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Page 11 of 30
09/2015
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PI34xx-00
PI3422-00-LGIZ (2.5 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 125 nH (Note 1) unless other conditions are noted.
Parameter
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
Symbol
Conditions
VIN_DC
IIN_DC
Input Specifications
Minimum 1 mA load required
VIN = 12 V, TC = 25°C, IOUT = 15 A
IIN_Short
Note [2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Specifications
Note [2]
Note [3]
@25°C, 8 V <VIN <18 V
@25°C, 0.5 A <IOUT <15 A
IOUT = 7.5 A, COUT = 8 x100µF, 20 MHz BW, Note [4]
UVLO Start Threshold
UVLO Stop Hysteresis
UVLO Stop Threshold
OVLO Start Hysteresis
UVLO/OVLO Fault Delay Time
UVLO/OVLO Response Time
Output Overvoltage Protection
Over-Temperature Fault Threshold
Over-Temperature Restart Hysteresis
Protection
VUVLO_START
VUVLO_HYS
VOVLO
VOVLO_HYS
tf_DLY
Number of the switching frequency cycles
tf
+1% overdrive
VOVP
Above Set VOUT
TOTP
TOTP_HYS
[3]
[4]
[5]
[6]
[7]
Max
Unit
8
12
3.37
18
V
A
10
mA
2.6
4.0
VOUT_DC
VOUT_DC
∆VOUT(∆VIN)
∆VOUT(∆IOUT)
VOUT_AC
IOUT_DC
IOUT_CL
[2]
Typ
Disabled
Enabled (no load)
Note [2]
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
[1]
Min
2.465
2.0
2.5
2.5
0.10
0.20
14
mA
1
V/µs
2.535
3.1
V
V
%
%
mVp-p
A
A
15
18
7.20
4
19.71
1.56
130
7.60
5
20.75
1.83
128
500
20
135
30
8.00
6
21.78
2.1
140
V
V
V
V
Cycles
ns
%
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Minimum 5 V between Vin-Vout must be maintained or a minimum load of 1 mA required.
Cool-Power®
Rev 1.2
vicorpower.com
Page 12 of 30
09/2015
800 927.9474
PI34xx-00
PI3422-00-LGIZ (2.5 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 125 nH (Note 1) unless other conditions are noted.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
∆fSYNCI
VSYNCI
Note [6]
650
30
Sync In (SYNCI)
Relative to set switching frequency. Note [3]
50
kHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft–Start)
Discharge Current (Fault)
Soft-Start Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
VTRK
VTRK_MAX
VTRK_OV
ITRK
ITRK_DIS
tSS
Source 1mA
Sink 1mA
20pF load
20pF load
4.5
0.5
10
10
Soft Start And Tracking
Internal reference tracking range.
0
20
-70
CTRK = 0uF
1.2
1.2
40
-50
6.8
2.2
V
V
ns
ns
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
[1]
[2]
[3]
[4]
[5]
[6]
[7]
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Minimum 5 V between Vin-Vout must be maintained or a minimum load of 1 mA required.
Cool-Power®
Rev 1.2
vicorpower.com
Page 13 of 30
09/2015
800 927.9474
PI34xx-00
PI3422-00-LGIZ (2.5 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency %
90
85
80
8 Vin
12 Vin
18 Vin
75
70
65
60
55
50
0
1
2
4
3
5
6
7
9
8
10
11
12
13
14
15
IOUT (A)
Figure 13 — Regulator and inductor performance
Figure 16 — 12 VIN to 2.5 VOUT, COUT = 8 X 100 µF Ceramic
VOUT (Ch2) = 100 mV/Div, IIN (Ch1) = 10 A/Div, 100 µS/Div
Figure 14 — VOUT (Ch3) = 1V/Div, IIN (Ch4) = 2 A/Div, 800 µs/Div
Figure 17 — COUT = 8 X 100 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Switching Frequency vs. Load Current
Switching Frequency (kHz)
800
700
600
500
8 Vin
12 Vin
18 Vin
400
300
200
100
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
IOUT (A)
Figure 18 — COUT = 8 X 100 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Figure 15 — Switching Frequency vs. Load Current
Cool-Power®
Rev 1.2
vicorpower.com
Page 14 of 30
09/2015
800 927.9474
PI34xx-00
PI3423-00-LGIZ (3.3 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 150 nH (Note 1) unless other conditions are noted.
Parameter
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
Symbol
Conditions
VIN_DC
IIN_DC
Input Specifications
Minimum 1 mA load required
VIN = 12 V, TC = 25°C, IOUT = 15 A
IIN_Short
Note [2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Specifications
Note [2]
Note [3]
@25°C, 8 V <VIN <18 V
@25°C, 0.5 A <IOUT <15 A
IOUT = 7.5 A, COUT = 8 x100µF, 20 MHz BW, Note [4]
UVLO Start Threshold
UVLO Stop Hysteresis
UVLO Stop Threshold
OVLO Start Hysteresis
UVLO/OVLO Fault Delay Time
UVLO/OVLO Response Time
Output Overvoltage Protection
Over-Temperature Fault Threshold
Over-Temperature Restart Hysteresis
Protection
VUVLO_START
VUVLO_HYS
VOVLO
VOVLO_HYS
tf_DLY
Number of the switching frequency cycles
tf
+1% overdrive
VOVP
Above Set VOUT
TOTP
TOTP_HYS
[3]
[4]
[5]
[6]
[7]
Max
Unit
8
12
4.43
18
V
A
10
mA
2.6
4
VOUT_DC
VOUT_DC
∆VOUT(∆VIN)
∆VOUT(∆IOUT)
VOUT_AC
IOUT_DC
IOUT_CL
[2]
Typ
Disabled
Enabled (no load)
Note [2]
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
[1]
Min
3.25
2.3
3.30
3.3
0.10
0.10
17
mA
1
V/µs
3.36
4.1
V
V
%
%
mVp-p
A
A
15
18
7.20
4
19.71
1.56
130
7.60
5
20.75
1.83
128
500
20
135
30
8.00
6
21.78
2.1
140
V
V
V
V
Cycles
ns
%
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Minimum 5 V between Vin-Vout must be maintained or a minimum load of 1 mA required.
Cool-Power®
Rev 1.2
vicorpower.com
Page 15 of 30
09/2015
800 927.9474
PI34xx-00
PI3423-00-LGIZ (3.3 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 150 nH (Note 1) unless other conditions are noted.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
∆fSYNCI
VSYNCI
Note [6]
700
30
Sync In (SYNCI)
Relative to set switching frequency. Note [3]
50
kHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft–Start)
Discharge Current (Fault)
Soft-Start Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
VTRK
VTRK_MAX
VTRK_OV
ITRK
ITRK_DIS
tSS
Source 1mA
Sink 1mA
20pF load
20pF load
4.5
0.5
10
10
Soft Start And Tracking
Internal reference tracking range.
0
20
-70
CTRK = 0uF
1.2
1.2
40
-50
6.8
2.2
V
V
ns
ns
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
[1]
[2]
[3]
[4]
[5]
[6]
[7]
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Minimum 5 V between Vin-Vout must be maintained or a minimum load of 1 mA required.
Cool-Power®
Rev 1.2
vicorpower.com
Page 16 of 30
09/2015
800 927.9474
PI34xx-00
PI3423-00-LGIZ (3.3 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency %
90
85
80
8 Vin
12 Vin
18 Vin
75
70
65
60
55
50
0
1
2
4
3
5
6
7
9
8
10
11
12
13
14
15
IOUT (A)
Figure 19 — Regulator and inductor performance
Figure 22 — 12 VIN to 2.5 VOUT, COUT = 8 X 100 µF Ceramic
VOUT (Ch2) = 100 mV/Div, IIN (Ch1) = 10 A/Div, 100 µS/Div
Figure 20 — VOUT (Ch3) = 1 V/Div, IIN (Ch4) = 2 A/Div, 800 µs/Div
Figure 23 — COUT = 8 X 100 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Switching Frequency vs. Load Current
Switching Frequency (kHz)
800
700
600
500
8 Vin
12 Vin
18 Vin
400
300
200
100
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
IOUT (A)
Figure 24 — COUT = 8 X 100 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Figure 21 — Switching Frequency vs. Load Current
Cool-Power®
Rev 1.2
vicorpower.com
Page 17 of 30
09/2015
800 927.9474
PI34xx-00
PI3424-00-LGIZ (5.0 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 150 nH (Note 1) unless other conditions are noted.
Parameter
Input Voltage
Input Current
Input Current At Output Short
(fault condition duty cycle)
Symbol
Conditions
VIN_DC
IIN_DC
Input Specifications
Minimum 1 mA load required
VIN = 12 V, TC = 25°C, IOUT = 15 A
IIN_Short
Note [2]
Input Quiescent Current
IQ_VIN
Input Voltage Slew Rate
VIN_SR
Output Specifications
Note [2]
Note [3]
@25°C, 8 V <VIN <18 V
@25°C, 0.5 A <IOUT <15 A
IOUT = 7.5 A, COUT = 8 x100µF, 20 MHz BW, Note [4]
UVLO Start Threshold
UVLO Stop Hysteresis
UVLO Stop Threshold
OVLO Start Hysteresis
UVLO/OVLO Fault Delay Time
UVLO/OVLO Response Time
Output Overvoltage Protection
Over-Temperature Fault Threshold
Over-Temperature Restart Hysteresis
Protection
VUVLO_START
VUVLO_HYS
VOVLO
VOVLO_HYS
tf_DLY
Number of the switching frequency cycles
tf
+1% overdrive
VOVP
Above Set VOUT
TOTP
TOTP_HYS
[3]
[4]
[5]
[6]
[7]
Max
Unit
8
12
6.57
18
V
A
10
mA
2.6
4
VOUT_DC
VOUT_DC
∆VOUT(∆VIN)
∆VOUT(∆IOUT)
VOUT_AC
IOUT_DC
IOUT_CL
[2]
Typ
Disabled
Enabled (no load)
Note [2]
Output Voltage Total Regulation
Output Voltage Trim Range
Line Regulation
Load Regulation
Output Voltage Ripple
Continuous Output Current Range
Current Limit
[1]
Min
4.93
3.3
5
mA
1
V/µs
5.07
6.5
V
V
%
%
mVp-p
A
A
0.10
0.10
20.8
15
18
7.20
4
19.71
1.56
130
7.60
5
20.75
1.83
128
500
20
135
30
8.00
6
21.78
2.1
140
V
V
V
V
Cycles
ns
%
°C
°C
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Minimum 5 V between Vin-Vout must be maintained or a minimum load of 1 mA required.
Cool-Power®
Rev 1.2
vicorpower.com
Page 18 of 30
09/2015
800 927.9474
PI34xx-00
PI3424-00-LGIZ (5.0 VOUT) Electrical Characteristics
Specifications apply for -40°C < TJ < 125°C, VIN =12 V, L1 = 150 nH (Note 1) unless other conditions are noted.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Timing
Switching Frequency
Fault Restart Delay
fS
tFR_DLY
Synchronization Frequency Range
SYNCI Threshold
∆fSYNCI
VSYNCI
Note [6]
750
30
Sync In (SYNCI)
Relative to set switching frequency. Note [3]
50
kHz
ms
110
2.5
%
V
Sync Out (SYNCO)
SYNCO High
SYNCO Low
SYNCO Rise Time
SYNCO Fall Time
TRK Active Input Range
TRK Max Output Voltage
TRK Disable Threshold
Charge Current (Soft–Start)
Discharge Current (Fault)
Soft-Start Time
VSYNCO_HI
VSYNCO_LO
tSYNCO_RT
tSYNCO_FT
VTRK
VTRK_MAX
VTRK_OV
ITRK
ITRK_DIS
tSS
Source 1mA
Sink 1mA
20pF load
20pF load
4.5
0.5
10
10
Soft Start And Tracking
Internal reference tracking range.
0
20
-70
CTRK = 0uF
1.2
1.2
40
-50
6.8
2.2
V
V
ns
ns
60
-30
V
V
mV
µA
mA
ms
1.1
0.9
300
V
V
mV
Enable
High Threshold
Low Threshold
Threshold Hysteresis
Enable Pull-Up Voltage
(floating, unfaulted)
Enable Pull-Down Voltage
(floating, faulted)
Source Current
Sink Current
[1]
[2]
[3]
[4]
[5]
[6]
[7]
VEN_HI
VEN_LO
VEN_HYS
0.9
0.7
100
1
0.8
200
VEN_PU
2
V
VEN_PD
0
V
IEN_SO
IEN_SK
-50
50
uA
uA
All parameters reflect regulator and inductor system performance. Measurements were made using a standard PI34xx-00 evaluation board with 3 x 4”
dimensions and 4 layer, 2oz copper. Refer to inductor pairing table within Application Description section for specific inductor manufacturer and value.
Regulator is assured to meet performance specifications by design, test correlation, characterization, and/or statistical process control.
Output current capability may be limited and other performance may vary from noted electrical characteristics when switching frequency or
VOUT is modified.
Refer to Output Ripple plots.
Refer to Load Current vs. Ambient Temperature curves.
Refer to Switching Frequency vs. Load current curves.
Minimum 5 V between Vin-Vout must be maintained or a minimum load of 1 mA required.
Cool-Power®
Rev 1.2
vicorpower.com
Page 19 of 30
09/2015
800 927.9474
PI34xx-00
PI3424-00-LGIZ (5.0 VOUT) Electrical Characteristics
Efficiency at 25°C
100
95
Efficiency %
90
85
80
8 Vin
12 Vin
18 Vin
75
70
65
60
55
50
0
1
2
4
3
5
6
7
9
8
10
11
12
13
14
15
IOUT (A)
Figure 25 — Regulator and inductor performance
Figure 28 — 12 VIN to 5.0 VOUT, COUT = 8 X 47 µF Ceramic
VOUT (Ch2) = 200 mV/Div, IOUT (Ch1) = 10 A/Div, 100 µS/Div
Figure 26 — VOUT (Ch1) = 2 V/Div, IIN (Ch4) = 5 A/Div, 800 µs/Div
Figure 29 — COUT = 8 X 47 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Switching Frequency vs. Load Current
Switching Frequency (kHz)
800
700
600
500
8 Vin
12 Vin
18 Vin
400
300
200
100
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
IOUT (A)
Figure 30 — COUT = 8 X 47 µF Ceramic, VOUT = 20 mV/Div, 2.0 µs/Div
Figure 27 — Switching Frequency vs. Load Current
Cool-Power®
Rev 1.2
vicorpower.com
Page 20 of 30
09/2015
800 927.9474
PI34xx-00
Thermal Derating Curves
PI3421 Load Current vs.
Ambient Temperature, 0 LFM
16
16
14
14
12
10
8 Vin
12 Vin
18 Vin
8
6
4
Load Current (A)
Load Current (A)
PI3420 Load Current vs.
Ambient Temperature, 0 LFM
12
10
8 Vin
12 Vin
18 Vin
8
6
4
2
2
0
0
25
35
45
55
65
75
85
95
105
25
115
35
45
Figure 31 — PI3420 - Load Current vs. Ambient Temperature, 0 LFM
75
85
95
105
115
PI3423 Load Current vs.
Ambient Temperature, 0 LFM
16
16
14
14
12
10
8 Vin
12 Vin
18 Vin
8
6
4
2
Load Current (A)
Load Current (A)
65
Figure 34 — PI3421 - Load Current vs. Ambient Temperature, 0 LFM
PI3422 Load Current vs.
Ambient Temperature, 0 LFM
12
10
8 Vin
12 Vin
18 Vin
8
6
4
2
0
0
25
35
45
55
65
75
85
95
105
115
25
35
45
Ambient Temperature (°C)
16
14
12
10
8 Vin
12 Vin
18 Vin
8
6
4
2
0
35
45
55
65
75
85
95
65
75
85
95
105
115
Figure 35 — PI3423 - Load Current vs. Ambient Temperature, 0 LFM
PI3424 Load Current vs.
Ambient Temperature, 0 LFM
25
55
Ambient Temperature (°C)
Figure 32 — PI3422 - Load Current vs. Ambient Temperature, 0 LFM
Load Current (A)
55
Ambient Temperature (°C)
Ambient Temperature (°C)
105
115
Ambient Temperature (°C)
Figure 33 — PI3424 - Load Current vs. Ambient Temperature, 0 LFM
Cool-Power®
Rev 1.2
vicorpower.com
Page 21 of 30
09/2015
800 927.9474
PI34xx-00
Functional Description
The PI34xx-00 is a family of highly integrated ZVS-Buck
regulators. The PI34xx-00 has a set output voltage that is
trimmable within a prescribed range shown in Table 1.
Performance and maximum output current are characterized
with a specific external power inductor
(see Table 4).
L1
VIN
VIN
CIN
PGND
PI34xx
VOUT
VS1
COUT
VOUT
Soft-Start
The PI34xx-00 includes an internal soft-start capacitor to
ramp the output voltage in 2ms from 0 V to full output
voltage. Connecting an external capacitor from the TRK pin
to SGND will increase the start-up ramp period. See, “Soft
Start Adjustment and Track,” in the Applications Description
section for more details.
Output Voltage Trim
The PI34xx-00 output voltage can be trimmed up from the
preset output by connecting a resistor from ADJ pin to SGND
and can be trimmed down by connecting a resistor from ADJ
pin to VOUT. The Table 1 defines the voltage ranges for the
PI34xx-00 family.
REM
TRK
SYNCO
ADJ
EN
EAO
SGND
SYNCI
Device
Figure 36 — ZVS-Buck with required components
For basic operation, Figure 36 shows the connections and
components required. No additional design or settings are
required.
ENABLE (EN)
EN is the enable pin of the regulator. The EN Pin is referenced
to SGND and permits the user to turn the regulator on or off.
The EN polarity is a positive logic assertion. If the EN pin is
left floating or asserted high, the regulator output is enabled.
Pulling EN pin below 0.8 Vdc with respect to SGND will
disable the regulator output.
Remote Sensing
An internal 100 Ω resistor is connected between REM pin and
VOUT pin to provide regulation when the REM connection is
broken. Referring to Figure 36, it is important to note that L1
and Cout are the output filter and the local sense point for
the power supply output. As such, the REM pin should be
connected at Cout as the default local sense connection
unless remote sensing to compensate additional distribution
losses in the system. The REM pin should not be left floating.
Switching Frequency Synchronization
The SYNCI input allows the user to synchronize the
controller switching frequency by an external clock
referenced to SGND. The external clock can synchronize the
unit between 50% and 110% of the preset switching
frequency (fS).
The PI34xx-00 syncs to the falling edge of the applied clock
providing 180° phase shift from SYNCO. This allows for the
paralleling of two PI34xx-00 devices. When using the
internal oscillator, the SYNCO pin provides a 5 V clock that
can be used to sync other regulators. Therefore, one PI34xx00 can act as the lead regulator and have additional
PI34xx-00s running in parallel and interleaved.
Output Voltage
Set
Range
PI3420-00-LGIZ
1.0 V
1.0 to 1.4 V
PI3421-00-LGIZ
1.8 V
1.4 to 2.0 V
PI3422-00-LGIZ
2.5 V
2.0 to 3.1 V
PI3423-00-LGIZ
3.3 V
2.3 to 4.1 V
PI3424-00-LGIZ
5.0 V
3.3 to 6.5 V
Table 1 — PI34xx-00 family output voltage ranges
Output Current Limit Protection
PI34xx-00 has two methods implemented to protect from
output short or over current condition.
Slow Current Limit protection: prevents the output load from
sourcing current higher than the regulator’s maximum rated
current. If the output current exceeds the Current Limit
(IOUT_CL) for 1024 us, a slow current limit fault is initiated and
the regulator is shutdown which eliminates output current
flow. After Fault Restart Delay (tFR_DLY), a soft-start cycle is
initiated. This restart cycle will be repeated indefinitely until
the excessive load is removed.
Fast Current Limit protection: PI34xx-00 monitors the
regulator inductor current pulse-by-pulse to prevent the
output from supplying very high current due to sudden low
impedance short
(50 A Typical). If the regulator senses a high inductor current
pulse, it will initiate a fault and stop switching until Fault
Restart Delay ends and then initiate a soft-start cycle.
Input Undervoltage Lockout
If VIN falls below the input Undervoltage Lockout (UVLO)
threshold, the regulator will enter a low power state and
initiate a fault. The system will restart once the input voltage
is reestablished and after the Fault Restart Delay.
Input Overvoltage Lockout
If VIN exceeds the input Overvoltage Lockout (OVLO)
threshold (VOVLO), while the regulator is running, the
PI34xx-00 will complete the current cycle and stop
switching. The system will resume operation after the Fault
Restart Delay.
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Output Overvoltage Protection
The PI34xx-00 family is equipped with output Overvoltage
Protection (OVP) to prevent damage to input voltage
sensitive devices. If the output voltage exceeds 20% of its set
regulated value, the regulator will complete the current cycle,
stop switching and issue an OVP fault. The system will
resume operation once the output voltage falls below the
OVP threshold and after Fault Restart Delay.
Overtemperature Protection
The internal package temperature is monitored to prevent
internal components from reaching their thermal maximum.
If the Over Temperature Protection Threshold (OTP) is
exceeded (TOTP), the regulator will complete the current
switching cycle, enter a low power mode, set a fault flag, and
will soft-start when the internal temperature falls below OverTemperature Restart (TOTP_HYS).
Parallel Operation
Paralleling modules can be used to increase the output
current capability of a single power rail and reduce output
voltage ripple.
L1
VIN
VIN
CIN
R1
SYNCO(#2)
VS1
VOUT
VOUT
COUT
PGND
PGD
ZVS Buck
(#1) REM
EN(#2)
EN
EAO
TRK(#2)
TRK
SGND
L1
VIN
VIN
CIN
SYNCO(#1)
SYNCI(#1)
EN(#1)
VS1
VOUT
PGND
PGD
Variable Frequency Operation
Each PI34xx-00 is preprogrammed to a base operating
frequency, with respect to the power stage inductor (see
Table 4), to operate at peak efficiency across line and load
variations. At low line and high load applications, the base
frequency will decrease to accommodate these extreme
operating ranges. By stretching the frequency, the ZVS
operation is preserved throughout the total input line voltage
range therefore maintaining optimum efficiency.
Output Voltage Trim
SYNCO
EAO(#2)
Pulse Skip Mode (PSM)
PI34xx-00 features a PSM to achieve high efficiency at light
loads. The regulators are setup to skip pulses if EAO falls
below a PSM threshold. Depending on conditions and
component values, this may result in single pulses or several
consecutive pulses followed by skipped pulses. Skipping
cycles significantly reduces gate drive power and improves
light load efficiency. The regulator will leave PSM once the
EAO rises above the Skip Mode threshold.
Application Description
SYNCI
SYNCI(#2)
initialize the open-loop startup synchronization. Once the
regulators reach regulation, SYNCI is released and the system
is now synchronized in a closed-loop configuration which
allows the system to adjust, on the fly, when any of the
individual regulators begin to enter variable frequency mode
in the loop.
COUT
ZVS Buck
(#2) REM
The PI34xx-00 family of Buck Regulators provides five
common output voltages: 1.0 V, 1.8 V, 2.5 V, 3.3 V and 5.0 V. A
post-package trim step is implemented to offset any resistor
divider network errors ensuring maximum output accuracy.
With a single resistor connected from the ADJ pin to SGND or
REM, each device’s output can be varied above or below the
nominal set voltage (the PI3420-00 can only be adjusted
above the set voltage of 1 V).
SYNCI
SYNCO
Device
EN
EAO(#1)
EAO
TRK(#1)
TRK
SGND
Figure 37 — PI34xx-00 parallel operation
By connecting the EAO pins and SGND pins of each module
together the units will share the current equally. When the
TRK pins of each unit are connected together, the units will
track each other during soft-start and all unit EN pins have to
be released to allow the units to start (See Figure 37). Also,
any fault event in any regulator will disable the other
regulators. The two regulators will be out of phase with each
other reducing output ripple (refer to Switching Frequency
Synchronization).
Output Voltage
Set
Range
PI3420-00-LGIZ
1.0 V
1.0 to 1.4 V
PI3421-00-LGIZ
1.8 V
1.4 to 2.0 V
PI3422-00-LGIZ
2.5 V
2.0 to 3.1 V
PI3423-00-LGIZ
3.3 V
2.3 to 4.1 V
PI3424-00-LGIZ
5.0 V
3.3 to 6.5 V
Table 2 — PI34xx-00 family output voltage ranges
The remote pin (REM) should always be connected to the
VOUT pin to prevent an output voltage offset. Figure 38 shows
the internal feedback voltage divider network.
To provide synchronization between regulators over the
entire operational frequency range, the Parallel Good (PGD)
pin must be connected to the lead regulator’s (#1) SYNCI pin
and a 2.5 kΩ Resistor, R1, must be placed between SYNCO
(#2) return and the lead regulator’s SYNCI (#1) pin, as shown
in Figure 37. In this configuration, at system soft-start, the
PGD pin pulls SYNCI low forcing the lead regulator to
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Resistor R_high should be connected as shown in Figure 38
to achieve the desired 4.0 V regulator output. No external
R_low resistor is need in this design example since the trim is
above the regulator set voltage.
VOUT
The PI3420 output voltage can only be trimmed higher than
the factory 1 V setting. The following Equation (3) can be
used calculate Rhigh values for the PI3420 regulators.
R4
REM
Rlow
R1
ADJ
+
Rhigh
R2
1.0 Vdc
SGND
Figure 38 — Internal resistor divider network
R1, R2, and R4 are all internal 1.0 % resistors and R_low and
R_high are external resistors for which the designer can add
to modify VOUT to a desired output. The internal resistor
values for each regulator are listed next in Table 3.
Device
R1
R2
R4
PI3420-00-LGIZ
1k
∞
100
PI3421-00-LGIZ
0.806 k
1.0 k
100
PI3422-00-LGIZ
1.5 k
1.0 k
100
PI3423-00-LGIZ
2.61 k
1.13 k
100
PI3424-00-LGIZ
4.53 k
1.13 k
100
Table 3 — PI34xx-00 Internal divider values
By choosing an output voltage value within the ranges stated
in Table 2, VOUT can simply be adjusted up or down by
selecting the proper R_high or R_low value, respectively. The
following equations can be used to calculate R_high and
R_low values:
Soft-Start Adjust and Tracking
The TRK pin offers a means to increase the regulator’s softstart time or to track with additional regulators. . The softstart slope is controlled by an internal capacitor and a fixed
charge current to provide a Soft-Start Time tSS for all for all
PI34xx-00 regulators. By adding an additional external
capacitor to the TRK pin, the soft-start time can be increased
further. The following equation can be used to calculate the
proper capacitor for a desired soft-start times:
CTRK = (tTRK x ITRK) – 100 x 10 -9,
where, tTRK is the soft-start time and ITRK is a 50 μA internal
charge current (see Electrical Characteristics for limits).
There is typically either a proportional or direct tracking
method implemented within a tracking design. For
proportional tracking between several regulators at startup,
simply connect all devices TRK pins together. This type of
tracking will force all connected regulators to startup and
reach regulation at the same time (see Figure 39 (a)).
For Direct Tracking, choose the regulator with the highest
output voltage as the master and connect the master TRK pin
to the TRK pin of the other regulators through a divider
(Figure 40) with the same ratio as the slave’s feedback
divider (see Table 3 for values).
VOUT 1
VOUT 2
(a)
Master VOUT
VOUT 2
If, for example, a 4.0 V output is needed, the user should
choose the regulator with a trim range covering 4.0 V from
Table 2. For this example, the PI3423 is selected (3.3 V set
voltage). First step would be to use Equation (1) to calculate
R_HIGH since the required output voltage is higher than the
regulator set voltage. The resistor-divider network values for
the PI3423 can be found in Table 3 and are
R1 = 2.61k Ω and R2 = 1.13 kΩ. Inserting these values in to
Equation (1), R_HIGH is calculated as follows:
(b)
t
Figure 39 — PI34xx-00 tracking methods
All connected regulators’ soft-start slopes will track with this
method. Direct tracking timing is demonstrated in
Figure 39 (b).
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PI34xx-00
Thermal Derating
Thermal de-rating curves are provided that are based on
component temperature changes versus load current, input
voltage and air flow. It is recommended to use these curves
as a guideline for proper thermal de-rating. These curves
represent the entire system and are inclusive to both the
Picor regulator and the external inductor. Maximum thermal
operation is limited by either the MOSFETs or inductor
depending upon line and load conditions.
Thermal measurements were made using a standard PI34xx00 Evaluation board which is 3 x 4 inches in area and uses 4layer, 2oz copper. Thermal measurements were made on the
three main power devices, the two internal MOSFETs and the
external inductor.
Master VOUT
R1
PI34xx
TRK
Slave
R2
SGND
Filter Considerations
The PI34xx-00 requires input bulk storage capacitance as
well as low impedance ceramic X5R input capacitors to
ensure proper start up and high frequency decoupling for the
power stage. The PI34xx-00 will draw nearly all of the high
frequency current from the low impedance ceramic
capacitors when the main high side MOSFET is conducting.
During the time the high side MOSFET is off, they are
replenished from the bulk capacitor. If the input impedance
is high at the switching frequency of the regulator, the bulk
capacitor must supply all of the average current into the
regulator, including replenishing the ceramic capacitors. This
value has been chosen to be 100μF so that the PI34xx-00 can
start up into a full resistive load and supply the output
capacitive load with the default minimum soft start capacitor
when the input source impedance is 50 Ohms at 1MHz. The
ESR for this capacitor should be approximately 20mΩ. The
RMS ripple current in this capacitor is small, so it should not
be a concern if the input recommended ceramic capacitors
are used. Table 5 shows the recommended input and output
capacitors to be used for the various models as well as
expected transient response, RMS ripple currents per
capacitor, and input and output ripple voltages. Table 6
includes the recommended input and output
ceramic capacitors.
Figure 40 — Voltage divider connections for direct tracking
All tracking regulators should have their Enable (EN) pins
connected together to work properly.
Inductor Pairing
The PI34xx-00 utilizes an external inductor from the Eaton
Inductor line at Cooper Industries. This inductor has been
optimized for maximum efficiency performance. Table 4
details the specific inductor value and part number utilized
for each PI34xx-00 device. Datasheets are available at
www.cooperindustries.com.
Inductor
Inductor
[nH}
Part Number
PI3420-00
85
FPV1006-85-R
Eaton
PI3421-00
125
FPV1006-125-R
Eaton
PI3422-00
125
FPV1006-125-R
Eaton
PI3423-00
150
FPV1006-150-R
Eaton
PI3424-00
150
FPV1006-150-R
Eaton
Device
Manufacturer
Table 4 — PI34xx-00 Inductor pairing
Device
VIN
(V)
PI3420
12
ILOAD
(A)
15
7.5
15
PI3421
12
7.5
15
PI3422
12
7.5
15
PI3423
12
7.5
15
PI3424
12
7.5
CINPUT
Bulk
Elec.
CINPUT
Ceramic
X5R
COUTPUT
Ceramic
X5R
CINPUT
Ripple
Current
(IRMS)
COUTPUT
Ripple
Current
(IRMS)
100 µF
50 V
6 x 22 µF
8 X 100 µF
2 X 1 µF
1 X 0.1 µF
0.85
1.24
100 µF
50 V
6 x 22 µF
8 X 100 µF
2 X 1 µF
1 X 0.1 µF
1.0
100 µF
50 V
6 x 22 µF
8 X 100 µF
2 X 1 µF
1 X 0.1 µF
1.12
100 µF
50 V
6 x 22 µF
8 X 100 µF
2 X 1 µF
1 X 0.1 µF
1.20
100 µF
50 V
6 x 22 µF
8 X 47 µF
2 X 1 µF
1 X 0.1 µF
1.29
Input
Ripple
(mVpp)
Output
Ripple
(mVpp)
98
36
43
27
139
32
45
20.4
145
28
74
14
179
26
97
17
209
34
98
24.8
1.18
1.16
1.15
1.13
Table 5 — Recommended input and output capacitance
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Output
Ripple
(mVpk)
Recovery
Time
(µs)
Load
Step
(A)
(Slew/µs)
-/+41
42
7.5
(5 A/µs)
-/+50
50
7.5
(5 A/µs)
-/+46
60
7.5
(5 A/µs)
-/+73
70
7.5
(5 A/µs)
-/+98
60
7.5
(5 A/µs)
PI34xx-00
Murata Part Number
Description
GRM188R71C105KA12D
1 µF 16 V 0603 X7R
GRM319R71H104KA01D
0.1 µF 50 V 1206 X7R
GRM31CR60J107ME39L
100 µF 6.3 V 1206 X5R
GRM31CR61A476ME15L
47 µF 10 V 1206 X5R
GRM31CR61E226KE15L
22 µF 25 V 1206 X5R
When Q1 is on and Q2 is off, the majority of CIN’s current is
used to satisfy the output load and to recharge the COUT
capacitors. When Q1 is off and Q2 is on, the load current is
supplied by the inductor and the COUT capacitor as shown in
Figure 43. During this period CIN is also being recharged by
the VIN. Minimizing CIN loop inductance is important to
reduce peak voltage excursions when Q1 turns off. Also, the
difference in area between the CIN loop and COUT loop is vital
to minimize switching and GND noise.
Table 6 — Capacitor manufacturer part numbers
Layout Guidelines
To achieve maximum efficiency and low noise performance
from a PI34xx-00 design, layout considerations are necessary.
Reducing trace resistance and minimizing high current loop
returns along with proper component placement will
contribute to optimal performance.
I
CNV
NV
A typical buck regulator circuit is shown in Figure 41. The
potential areas of high parasitic inductance and resistance
are the circuit return paths, shown as LR below.
COUT
Figure 43 — Current flow: Q2 closed
VIN
The recommended component placement, shown in Figure
44, illustrates the tight path between CIN and COUT (and VIN
and VOUT) for the high AC return current. This optimized
layout is used on the PI34xx-00 evaluation board.
Figure 41 — Typical Buck Regulator
The path between the COUT and CIN capacitors is of particular
importance since the AC currents are flowing through both
of them when Q1 is turned on.
Figure 42, schematically, shows the reduced trace length
between input and output capacitors. The shorter path
lessens the effects that copper trace parasitics can have on
the PI34xx-00 performance.
VOUT
COUT
GND
CIN
VSW
VIN
GND
I
NV
CNV
Figure 44 — Recommended component placement and metal routing
Figure 45 details the recommended receiving footprint for
PI34xx-00 10 mm x 14 mm package. All pads should have a
final copper size of 0.55 mm x 0.5 5mm, whether they are
solder-mask defined or copper defined, on a 1 mm x 1 mm
grid. All stencil openings are 0.55 mm when using
6mil stencil.
COUT
Figure 42 — Current flow: Q1 closed
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PI34xx-00
Recommended PCB Footprint and Stencil
Figure 45 — Recommended Receiving PCB footprint
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Package Drawings
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PI34xx-00
Revision History
Revision
Date
1.0
02/13
1.1
1.2
Description
Page Number(s)
Last release in old format
n/a
08/03/15
Reformatted in new template
n/a
09/03/15
Inductor pairing table updates
6, 7 & 25
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PI34xx-00
Vicor’s comprehensive line of power solutions includes high density AC-DC and DC-DC modules and
accessory components, fully configurable AC-DC and DC-DC power supplies, and complete custom
power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for its use. Vicor makes no
representations or warranties with respect to the accuracy or completeness of the contents of this publication. Vicor reserves the right to make
changes to any products, specifications, and product descriptions at any time without notice. Information published by Vicor has been checked and
is believed to be accurate at the time it was printed; however, Vicor assumes no responsibility for inaccuracies. Testing and other quality controls are
used to the extent Vicor deems necessary to support Vicor’s product warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
Specifications are subject to change without notice.
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All sales are subject to Vicor’s Standard Terms and Conditions of Sale, which are available on Vicor’s webpage or upon request.
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Vicor will repair or replace defective products in accordance with its own best judgment. For service under this warranty, the buyer must contact
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VICOR’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS
PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL COUNSEL OF VICOR CORPORATION. As used herein, life support
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products described in this data sheet. No license, whether express, implied, or arising by estoppel or otherwise, to any intellectual property rights is
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The products described on this data sheet are protected by the following U.S. Patents Numbers:
6,788,033; 7,154,250; 7,561,446; 7,361,844; D496,906; D506,438; 6,940,013; 7,038,917; 6,969,909; 7,166,898; 6,421,262; 7,368,957;
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Vicor Corporation
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Andover, MA 01810 USA
Picor Corporation
51 Industrial Drive
North Smithfield, RI 02896 USA
email
Customer Service: [email protected]
Technical Support: [email protected]
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