TI PT6931C

PT6930 Series
8-A 5V-Input Dual-Output
Integrated Switching Regulator
SLTS062B
(Revised 7/20/2001)
Features
Description
• Dual Outputs:
The PT6930 Excalibur™ series of 8-A
dual-output ISRs are designed to power
DSP ICs. Both output voltages are independently adjustable with external resistors.
The second output may also be set to an
alternate lower bus voltage with a simple
pin strap. Internal power sequencing of
both outputs, during both power-up and
power-down, meets the requirements of
most DSP chipsets.
+3.3V/2.5V
+3.3V/1.5V
+3.3V/1.8V
•
•
•
•
•
•
•
Adjustable Output Voltages
Remote Sense (both outputs)
Standby Function
Over-Temperature Protection
Soft-Start
Internal Sequencing
23-pin Excalibur™ Package
Pin-Out Information
Standard Application
Vo2 Sense
Vo1 Sense
STBY
3
V IN
4,5,6
22
1
PT6930
16
C1
Pin
Function
1
Vo1 Sense
13
Vo1
2
No Connect
14
Vo1
3
STBY
15
Vo1
4
V IN
16
Vo1 Adjust
PT6931o = +3.3 Volts
+2.5/1.8 Volts
PT6932o = +3.3 Volts
+1.5/1.2 Volts
PT6933o = +3.3 Volts
+1.8/1.2 Volts
18-21
Vo2
5
V IN
17
No Connect
12-15
Vo1
6
V IN
18
Vo2
7
GND
19
Vo2
PT Series Suffix (PT1234X)
8
GND
20
Vo2
9
GND
21
Vo2
10
GND
22
Vo2 Sense
11
GND
23
Vo2 Adjust*
12
Vo1
Case/Pin
Configuration
Vertical Through-Hole
Horizontal Through-Hole
Horizontal Surface Mount
+
7-11
Ordering Information
Pin Function
23
+
C3
C2
GND
GND
C 1/C 2 =Req’d 330µF electrolytic (See table footnotes)
C 3 =Optional 100µF electrolytic
N
A
C
(For dimensions and PC board layout, see
Package Styles 1320 and 1330).
* Note:Vo1 & Vo2 Adjust can be pin-strapped to an
alternative lower bus voltage. Consult the voltage
adjustment application note for more information.
Specifications
PT6930 SERIES
Characteristics
(Ta= 25°C unless noted)
Symbols
Output Current
Io1, Io2
Conditions
Ta = +60°C, 200 LFM, pkg N
Ta = +25°C, natural convection
Min
Vo1 =3.3V
Vo2 =2.5V
Vo2 =1.8V
Vo2 =1.5V
Vo1 =1.2V
0.1
0
0
0
0
(1)
Vo1 =3.3V
Vo2 =2.5V
Vo2 =1.8V
Vo2 =1.5V
Vo1 =1.2V
0.1
0
0
0
0
(1)
Max
Units
—
—
—
—
—
Typ
5.5 (2)
2.2 (2)
1.75 (2)
1.45 (2)
1.2 (2)
A
—
—
—
—
—
6.0 (2)
2.2 (2)
1.75 (2)
1.45 (2)
1.2 (2)
A
A
Input Voltage Range
V in
0.1A ≤ Io ≤ Ityp
4.5
—
5.5
V
Output Voltage Tolerance
∆V o
Vin = +5V, Io =Ityp, both outputs
0°C ≤ T a ≤ +65°C
Vo-0.1
—
Vo+0.1
V
Line Regulation
Regline
4.5V ≤ Vin ≤ 5.5V, Io =Ityp
Vo1
Vo2
—
—
±7
±7
±17
±13
V
Load Regulation
Regload
Vin = +5V, 0.1 ≤ Io ≤ Ityp
Vo1
Vo2
—
—
±17
±4
±33
±10
mV
Vo Ripple/Noise
Vn
Vin = +5V, Io =Ityp
Vo1
Vo2
—
—
50
25
—
—
mV
Transient Response
with C2 = 330µF
ttr
V os
Io step between 0.5xItyp and Ityp
Vo over/undershoot
Vo1
Vo2
—
—
—
25
60
60
—
—
—
µSec
Efficiency
η
Vin = +5V, Io =4A total
—
75
—
%
Switching Frequency
ƒo
4.5V ≤ Vin ≤5.5V
0.1A ≤ Io ≤ Ityp
475
600
725
mV
kHz
(Continued)
For technical support and more information, see inside back cover or visit www.ti.com
PT6930 Series
8-A 5V-Input Dual-Output
Integrated Switching Regulator
Specifications (From previous page)
PT6930 SERIES
Characteristics
(Ta= 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
+85 (4)
°C
Absolute Maximum
Operating Temperature Range
Ta
—
Storage Temperature
Ts
—
-40
—
+125
°C
Weight
—
Vertical/Horizontal
—
29
—
grams
—
-40 (3)
Notes: (1) Iomin current of 0.1A can be divided btween both outputs; Vo1, or Vo2. The ISR will operate down to no-load with reduced specifications.
(2) Iomax listed for each output assumes the maximum current drawn simultaneously on both outputs. Consult the factory for the absolute maximum.
(3) For operating temperatures below 0°C, use tantalum type capacitors at both the input and output.
(4) See Safe Operating Area curves for appropriate derating.
Input/Output Capacitors: The PT6930 series requires a minimumm capacitance of 330µF at both the input and Vo1 output for proper operation in all applications. In addition,
the input capacitor, C1, must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic dynamic loads, additional capacitance may be required.
T Y P I C A L
PT6930 Series Performance
90
C H A R A C T E R I S T I C S
Safe Operating Area @VIN =5V
(See Note A)
Total Efficiency vs Io1; Io2 =Io2(max)
90.0
(See Note B)
PT6931 (Io2 fixed at 2.2A)
Efficiency - %
PT6931
PT6932
PT6933
70
60
Ambient Temperature (°C)
80.0
80
VOUT
70.0
200LFM
120LFM
60LFM
Nat conv
60.0
50.0
40.0
30.0
50
20.0
0
1
2
3
4
5
6
0.0
Io1 (A) [ Io2 fixed at Io2(max) ]
1.0
2.0
3.0
4.0
5.0
6.0
Io1 (A) [ Io2 fixed at 2.2A ]
Vo1 Ripple vs Io1; Io2 =Io2(max)
50
Ripple - mV
40
30
PT6931
PT6932
PT6933
20
10
0
0
1
2
3
4
5
6
Io1(A) [ Io2 fixed at Io2(max) ]
Total Power Dissipation vs Io1; Io2 =Io2(max)
7
6
Pd - Watts
5
4
PT6931
PT6932
PT6933
3
2
1
0
0
1
2
3
4
5
6
Io1 (A) [ Io2 fixed at Io2(max) ]
Note A: All characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note B: SOA curves represent operating conditions at which internal components are at or below the manufactuer’s maximum rated operating temperatures.
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6920/PT6930 Series
Adjusting the Output Voltage of the PT6920 and
PT6930 Dual Output Voltage ISRs
Each output voltage from the PT6920 and PT6930 series
of ISRs can be independantly adjusted higher or lower than
the factory trimmed pre-set voltage. Vo1 or Vo2 may each
be adjusted either up or down using a single external resistor 2. Table 1 gives the adjustment range for both Vo1 and
Vo2 for each model in the series as Va(min) and Va(max).
Note that Vo2 must always be lower than Vo1 3.
Vo1 Adjust Up: To increase the output, add a resistor R4
between pin 16 (V1 Adjust) and pins 7-11 (GND) 2.
5. If Vo1 is increased above 3.3V, the minimum input voltage
to the ISR must also be increased. The minimum
required input voltage must be (Vo1 + 1.2)V or 4.5V,
whichever is greater. Do not exceed 5.5V
6. Never connect capacitors to either the Vo1 Adjust or Vo2
Adjust pins. Any capacitance added to these control pins
will affect the stability of the respective regulated output.
7. Adjusting either voltage (Vo1 or Vo2) may increase the
power dissipation in the regulator, and correspondingly
change the maximum current available at either output.
Consult the factory for application assistance.
The adjust up and adjust down resistor values can also be
calculated using the following formulas. Be sure to select
the correct formula parameter from Table 1 for the output
and model being adjusted.
Vo1 Adjust Down: Add a resistor (R3), between pin 16
(Vo1 Adjust) and pin 1 (Vo1 Sense) 2.
Vo2 Adjust Up: Add a resistor R2 between pin 23
(Vo2 Adjust) and pins 7-11 (GND) 2.
Vo2 Adjust Down: Add a resistor (R1) between pin 23
(Vo2 Adjust) and pin 22 (Vo2 Sense) 2.
Refer to Figure 1 and Table 2 for both the placement and value of
the required resistor.
(R1) or (R3)
=
Ro (Va – Vr)
– Rs
Vo – Va
kΩ
R2 or R4
=
Vr . Ro
Va – Vo
kΩ
Where:
Vo
Va
Vr
Ro
Rs
Notes:
1. The output voltages, Vo1 and Vo2, may be adjusted
independantly.
2. Use only a single 1% resistor in either the (R3) or R4
location to adjust Vo1, and in the (R1) or R2 location to
adjust Vo2. Place the resistor as close to the ISR as
possible.
3. Vo2 must always be at least 0.2V lower than Vo1.
4. Vo2 on both the PT6921 and PT6931 models may be
adjusted from 2.5V to 1.8V by simply connecting pin
22 (Vo2 Sense) to pin 23 (Vo2 Adjust). For more
details, consult the data sheet.
– Rs
= Original output voltage, (Vo1 or Vo2)
= Adjusted output voltage
= The reference voltage from Table 1
= The resistance value from Table 1
= The series resistance from Table 1
Table 1
PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS
Output Bus
Series Pt #
Standard Case
Excalibur Case
Adj. Resistor
Vo1
Vo2
PT6921/22
PT6931/32
(R3)/R4
PT6921
PT6931
(R1)/R2
PT6922
PT6932
(R1)/R2
PT6933
(R1)/R2
Vo(nom)
3.3V
2.5V
1.5V
1.8V
Va(min)
2.3V
1.8V
1.2V
1.2V
Va(max)
3.6V
3.0V
3.0V
3.0V
Vr
1.02V
1.0V
1.0V
1.0V
Ω)
Ro (kΩ
12.1
10.0
9.76
Ω)
Rs (kΩ
12.1
11.5
6.49
Figure 1
22
V 2 (sns)
V 2 out
4,5,6
Vin
1
V 1 (sns)
V 1 out
STBY
3
+
18 - 21
V 2o
12 - 15
V 1o
PT6920
Vin
GND
7 - 11
Vo 2 (adj) Vo 1 (adj)
23
16
(R3)
Adj Down
(R1)
C1
+
C2
R4
Adjust Up
+
C3
L
O
A
D
L
O
A
D
R2
COM
CO
Adjust V1out
For technical support and more information, see inside back cover or visit www.ti.com
Adjust V2out
10.0
3.32
Application Notes continued
PT6920/PT6930 Series
Table 2
PT6920/PT6930 ADJUSTMENT RESISTOR VALUES
Output Bus
Series Pt#
Standard Case
Excalibur Case
Adj Resistor
Vo(nom)
Vo1
Vo2
PT6921/6922
PT6931/6932
(R3)/R4
3.3Vdc
PT6921
PT6931
(R1)/R2
2.5Vdc
Va(req’d)
1.2
PT6922
PT6932
(R1)/R2
1.5Vdc
PT6933
(R1)/R2
1.8Vdc
(0.0)kΩ
(0.0)kΩ
1.25
(3.3)kΩ
(1.2)kΩ
1.3
(8.2)kΩ
(2.7)kΩ
1.35
(16.3)kΩ
(4.5)kΩ
1.4
(32.6)kΩ
(6.7)kΩ
1.45
(81.4)kΩ
1.5
(9.5)kΩ
(13.3)kΩ
1.55
189.0kΩ
(18.7)kΩ
1.6
91.1kΩ
(26.7)kΩ
1.65
58.6kΩ
(40.0)kΩ
1.7
42.3kΩ
(66.7)kΩ
1.75
32.6kΩ
(147.0)kΩ
1.8
(0.0)kΩ
26.0kΩ
1.85
(1.6)kΩ
21.4kΩ
197.0kΩ
1.9
(3.5)kΩ
17.9kΩ
96.7kΩ
1.95
(5.8)kΩ
15.2kΩ
63.3kΩ
2.0
(8.5)kΩ
13.0kΩ
46.7kΩ
2.05
(11.8)kΩ
11.3kΩ
36.7kΩ
2.1
(16.0)kΩ
9.8kΩ
30.0kΩ
2.15
(21.4)kΩ
8.5kΩ
25.3kΩ
2.2
(28.5)kΩ
7.5kΩ
21.7kΩ
2.25
(38.5)kΩ
6.5kΩ
18.9kΩ
2.3
(3.4)kΩ
(53.5)kΩ
5.7kΩ
16.7kΩ
2.35
(4.8)kΩ
(78.5)kΩ
5.0kΩ
14.9kΩ
2.4
(6.5)kΩ
(129.0)kΩ
4.4kΩ
13.3kΩ
2.45
(8.3)kΩ
(279.0)kΩ
3.8kΩ
12.1kΩ
2.5
(10.3)kΩ
3.3kΩ
11.0kΩ
2.55
(12.6)kΩ
189.0kΩ
2.8kΩ
10.0kΩ
2.6
(15.2)kΩ
88.5kΩ
2.4kΩ
9.2kΩ
2.65
(18.2)kΩ
55.2kΩ
2.0kΩ
8.4kΩ
2.7
(21.8)kΩ See Note 3
38.5kΩ
1.6kΩ
7.8kΩ
2.75
(26.0)kΩ
28.5kΩ
1.3kΩ
7.2kΩ
2.8
(31.0)kΩ
21.8kΩ
1.0kΩ
6.7kΩ
2.85
(37.1)kΩ
17.1kΩ
0.7kΩ
6.2kΩ
2.9
(44.8)kΩ
13.5kΩ
0.5kΩ
5.8kΩ
2.95
(54.6)kΩ
10.7kΩ
0.2kΩ
5.4kΩ
3.0
(67.8)kΩ
8.5kΩ
0.0kΩ
5.0kΩ
3.05
(86.2)kΩ
3.1
(114.0)kΩ
3.15
(160.0)kΩ
3.2
(252.0)kΩ
3.25
(528.0)kΩ
3.3
3.4
111.0kΩ See Note 5
3.5
49.6kΩ
3.6
29.0kΩ
R1/R3 = (Blue)
R2/R4 = Black
For technical support and more information, see inside back cover or visit www.ti.com
Application Notes
PT6920/PT6930 Series
Using the Standby Function on the PT6920 and
PT6930 Dual Output Voltage Converters
Figure 1
22
Both output voltages of the 23-pin PT6920/6930 dual
output converter may be disabled using the regulator’s
standby function. This function may be used in applications
that require power-up/shutdown sequencing, or wherever
there is a requirement to control the output voltage On/
Off status with external circuitry.
The standby function is provided by the STBY* control
(pin 3). If pin 3 is left open-circuit the regulator operates
normally, and provides a regulated output at both Vo1
(pins 12–15) and Vo2 (pins 18–21) whenever a valid supply
voltage is applied to Vin (pins 4, 5, & 6) with respect to
GND (pins 7–11). If a low voltage 2 is then applied to pin 3,
both regulator outputs will be simultaneously disabled and
the input current drawn by the ISR will typcially drop to
less than 30mA (50mA max). The standby control may also
be used to hold-off both regulator outputs during the period that input power is applied.
The standby pin is ideally controlled using an open-collector
(or open-drain) discrete transistor (See Figure 1). It may
also be driven directly from a dedicated TTL3 compatible
gate. Table 1 provides details of the threshold requirements.
Table 1 Inhibit Control Thresholds 2,3
Parameter
Min
Max
Enable (VIH)
Disable (VIL)
1.8V
Vin
–0.1V
0.8V
Notes:
1. The Standby/Inhibit control logic is similar for all
Power Trends’ modules, but the flexibility and
threshold tolerances will be different. For specific
information on this function for other regulator
models, consult the applicable application note.
V 2 (sns)
1
V 1 (sns)
V 2 out
4,5,6
V in
V 1 out
STBY
3
+
18 - 21
V 2 out
12 - 15
V 1 out
PT6921
Vin
GND
Vo 2 (adj)
7 - 11
23
V 0 1 (adj)
16
C1
+
C2
COM
+
C3
COM
Q1
BSS138
Inhibit
+5V V in
Turn-On Time: Turning Q1 in Figure 1 off removes the lowvoltage signal at pin 3 and enables both outputs from the
PT6920/6930 regulator. Following a delay of about 10–20ms,
Vo 1 and Vo2 rise together until the lower voltage, Vo2,
reaches its set output. Vo1 then continues to rise until both
outputs reach full regulation voltage. The total power-up
time is less than 25ms, and is relatively independant of load,
temperature, and output capacitance. Figure 2 shows waveforms of the output voltages Vo1 and Vo2, for a PT6931
(3.3V/2.5V). The turn-off of Q1 corresponds to the rise in
Vstby. The waveforms were measured with a 5Vdc input
voltage, and with resistive loads of 5A and 2A at the Vo1
and Vo2 outputs respectively.
Figure 2
2. The Standby control pin is ideally controlled using an
open-collector (or open-drain) discrete transistor and
requires no external pull-up resistor. To disable the
regulator output, the control pin must be pulled to
less than 0.8Vdc with a low-level 0.5mA sink to
ground.
3. The Standby input on the PT6920/6930 series may
be driven by a differential output device, making it
directly compatible with TTL logic. The control
input has an internal pull-up to the input voltage Vin.
A voltage of 1.8V or greater ensures that the
regulator is enabled. Do not use devices that can drive
the Standby control input above 5.5V or Vin.
For technical support and more information, see inside back cover or visit www.ti.com
Vo1 (3.3V)
Vo2 (2.5V)
Vstby
Ch1 1V/Div
Ch2 1V/Div
Timebase: 5ms/Div
Ch3 5V/Div
Application Notes continued
PT6920/PT6930 Series
Capacitor Recommendations for the Dual-Output
PT6920/30 Regulator Series
Input Capacitors:
The recommended input capacitance is determined by 1.0
ampere minimum ripple current rating and 330µF minimum
capacitance (300µF for Oscon® or low ESR tantalum).
Ripple current and <100mΩ equivalent series resistance
(ESR) values are the major considerations, along with temperature, when designing with different types of capacitors.
Tantalum capacitors have a recommended minimum voltage
rating of 2 × the maximum DC voltage + AC ripple. This is
necessary to insure reliability for input voltage bus applications.
Output Capacitors: C2(Required), C3(Optional)
The ESR of the required capacitor (C2) must not be greater
than 150mΩ. Electrolytic capacitors have poor ripple performance at frequencies greater than 400kHz but excellent
low frequency transient response. Above the ripple frequency, ceramic capacitors are necessary to improve the
transient response and reduce any high frequency noise
components apparent during higher current excursions.
Preferred low ESR type capacitor part numbers are identified
in Table 1. The optional 100µF capacitor (C3) for Vo2 can
have an ESR of up to 200mΩ for optimum performance
and ripple reduction. (Note: Vendor part numbers for the
optional capacitor, C3, are not identified in the table. Use the
same series selected for C2)
Tantalum Capacitors
Tantalum type capacitors can be used for the output but only
the AVX TPS series, Sprague 593D/594/595 series or Kemet
T495/T510 series. The AVX TPS series, Kemet or Sprague
series tantalums are recommended over many other types
due to their higher rated surge, power dissipation, and ripple
current capability. As a caution the TAJ series by AVX is not
recommended. This series has considerably higher ESR,
reduced power dissipation and lower ripple current capability.
The TAJ Series is a less reliable when compared to the AVX
TPS series when determining power dissipation capability.
Tantalum types are recommended for applications where
ambient temperatures fall below 0°C.
Capacitor Table
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The number of capacitors required at both the
input and output buses is identified for each capacitor type.
This is not an extensive capacitor list. Capacitors from other
vendors are available with comparable specifications. Those listed
are for guidance. The RMS ripple current rating and ESR
(Equivalent Series Resistance at 100kHz) are critical parameters
necessary to insure both optimum regulator performance and
long capacitor life.
Table 1: Input/Output Capacitors
Capac i t or
Vendor/
C o mp o n e n t
Ser i es
Capac i t or Char ac t e r i s t i c s
Qu a n t i t y
Working
Voltage
Value(µF)
( ESR) Equi v al e nt
Se r i e s Re s i s t anc e
8 5 ° C Ma x i m u m
Ri ppl e
C u r r e n t ( I r ms )
Phy s i c al
S i z e ( mm)
I nput
Bu s
Ou t p u t
Bu s
Vendor Number
Panasonic
FC
25V
35V
35V
560µF
390µF
330µF
0.0065W
0.065W
0.117W
1205mA
1205mA
555mA
12.5x15
12.5x15
8x11.5
1
2
(a)
1
1
1
EEUFC1E561S
EEUFC1V391S
EEUFC1C331
United
Chemi -con
LXV/FS/
LXZ
16V
35V
10V
20V
330µF
470µF
330µF
150µF
0.120W
0.052W
0.025W
0.030/2W
555mA
1220mA
3500mA
3200mA
8x12
10x20
10x10.5
10x10.5
(a)
1
1
2
1
1
(N/R)
(N/R)
LXZ16VB331M8X12LL
LXZ35VB471M10X20LL
10FS330M
20FS150M
Nichicon
PL
PM
35V
35V
50V
560µF
330µF
470µF
0.048W
0.065/2W
0.046W
1360mA
1020mA
1470mA
16x15
12.5x15
18x15
1
1
1
1
1
1
UPL1V561MHH6
UPL1V331MHH6
UPM1H4711MHH6
Panasonic
FC
Surface Mtg
10V
35V
16V
1000µF
330µF
330µF
0.043W
0.065W
0.150W
1205mA
1205mA
670mA
12x16.5
12.5x16
10x10.2
1
1
(a)
1
1
1
EEVFC1A102LQ
EEVFC1V331LQ
EEVFC1C331P
Oscon- SS
SV
10V
10V
20V
330µF
330µF
150µF
0.025W
0.025W
0.024/2W
>3500mA
>3800mA
3600mA
10.0x10.5
10.3x10.3
10.3x10.3
1
1
2
(N/R)
(N/R)
(N/R)
10SS330M
10SV300M
20SV150M
SV= Surface Mount
10V
10V
10V
330µF
330µF
220µF
0.100/2W
0.100/2W
0.095W
>2500mA
>3000mA
>2000mA
7.3Lx
4.3Wx
4.1H
2
2
2
1
1
2
TPSV337M010R0100
TPSV337M010R0060
TPSV227M0105R0100
Kemet
T510
T495
10V
10V
330µF
220µF
0.033W
0.070W/2=0.035W
1400mA
>2000mA
7.3Lx5.7W
x 4.0H
2
2
1
2
T510X337M010AS
T495X227M010AS
Sprague
594D
10V
10V
330µF
220µF
0.0450W
0.065W
2350mA
>2000mA
7.3Lx
6.0Wx
4.1H
2
2
1
2
4D337X0010R2T
594D227X0010D2T
AVX
Tantalum
TPS
(a) -Not recommended. The maximum ripple current rating of these capacitors does not meet the operating limits.
(N/R) -Oscon Type Capcitors are not recommended for this application due to extremely low equivatlent series resistance (ESR)
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