TI PT6703A

PT6703—3.3V/5V
13-A Low-Voltage Programmable
Integrated Switching Regulator
SLTS151
(Revised 6/26/2001)
Features
• +3.3V/5V Input
• 13-A Output Current
• 5-Bit Programmable Output:
1.1V to 1.85V (25mV Steps)
• VRM 9.0 Compatible
• 86% Efficiency
• Standby On/Off Control
•
•
•
•
•
•
Differential Remote Sense
Over-Voltage Protection Drive
Power Good Signal
Short Circuit Protection
Space Saving Solderable Case
4.7·106 Hrs. MTBF
Pin-Out Information
Description
Ordering Information
The PT6703 is a fully integrated
13 A switching regulator housed in
a space-saving solderable package. The
PT6703 will operate from either a
3.3V or 5V input to provide a highperformance low-voltage output that is
programmable over the range 1.1V to
1.85V. This output voltage range is
specifically suited to high performance
µP and DSP applications that require
core supply voltages below 1.3V. The
voltage control inputs are also TTL
compatible. Additional features include output short circuit protection,
a “Power Good” output, and an overvoltage protection (OVP) drive.
PT6703o = 1.1 to 1.85 Volts
(For dimensions and PC board
layout, see Package Styles 1300 &
1310.)
PT Series Suffix (PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
Horizontal Through-Hole
Horizontal Surface Mount
N
A
C
Pin Function
Pin Function
1
OVP Drive
13
Remote Sense Gnd
2
3
Pwr Good
VID0
14
15
GND
GND
4
VID1
16
GND
5
VID2
17
GND
6
7
VID3
VID4
18
19
GND
Vout
8
STBY*
20
Vout
9
Do not connect
21
Vout
10
11
Vin
Vin
22
23
Vout
Remote Sense Vout
12
Vin
( 2)
For STBY* pin: open = output enabled
ground = output disabled.
Standard Application
PROGRAMMING PINS
OVP DRV
VID0
VID1
VID2
VID3
VID4
VIN
REMOTE SENSE (+)
7 6 5 4 3
L1
10–12
CIN
1,000µF
+
23
2
8
14–18
VOUT
19–22
PT6703
1µH
R1
1
13
COUT
330µF
+
LOAD
PWR GOOD
GND
GND
STBY*
REMOTE SENSE (-)
C in/C out : Required electrolytic capacitors –see footnotes.
L 1: Optional 1µH input choke –see footnotes
R1 : 10-kΩ pull-up for Pwr Good signal.
Pwr Good is high when the output is within specification.
For technical support and more information, see inside back cover or visit www.ti.com
PT6703—3.3V/5V
13-A Low-Voltage Programmable
Integrated Switching Regulator
Programming Information
VID3
VID2
VID1
VID0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
VID4=1
Vout
PT6700 Product Family Comparison
VID4=0
Vout
0.000V
1.100V
1.125V
1.150V
1.175V
1.200V
1.225V
1.250V
1.275V
1.300V
1.325V
1.350V
1.375V
1.400V
1.425V
1.450V
Input
Voltage
1.475V
1.500V
1.525V
1.550V
1.575V
1.600V
1.625V
1.650V
1.675V
1.700V
1.725V
1.750V
1.775V
1.800V
1.825V
1.850V
Program
Range
OVP/
+12V Bias
Pwr Good Required
PT6701
5V
5-Bit
1.3V– 3.5V
ü
PT6702
3.3V
4-Bit
1.3V– 2.05V
ü
PT6703
3.3V/5V
5-Bit
1.1V– 1.85V
ü
# PT6705
5V
Resistor
1.5V–3.3V
# PT6715
5V
Resistor
1.5V–3.3V
PT6721
12V
5-Bit
1.3V– 3.5V
ü
PT6722
12V
5-Bit
1.1V– 1.85V
ü
# PT6725
12V
Resistor
1.5V–5.0V
ü
# –Indicates a series of products that have a nominal output voltage
set-point and may be adjusted with an external resistor.
Logic 0 = Pin 13 potential (remote sense gnd)
Logic 1 = Open circuit (no pull-up resistors)
VID4 may not be changed while the unit is operating.
Specifications
Adjust
Method
(Unless otherwise stated, Ta =25°C, V in =3.3V, C out =330µF, and I o =Iomax)
Characteristic
Symbol
Output Current
Io
Input Voltage Range
Set Point Voltage Tolerance
Temperature Variation
Line Regulation
Load Regulation
Total Output Voltage Variation
Vin
Vo tol
Regtemp
Regline
Regload
∆Votot
Efficiency
η
Vo Ripple (pk-pk)
Transient Response
Vr
ttr
∆Vtr
Isc
ƒo
20MHz bandwidth
0.1A/µs load step, 6A to 12A
Vo over/undershoot
VIH
V IL
IIL
Iin standby
Cout
Ta
Referenced to GND (pin 14)
Short Circuit Current
Switching Frequency
Standby Control (pin 8)
Input High Voltage
Input Low Voltage
Input Low Current
Standby Input Current
External Output Capacitance
Maximum Operating
Temperature Range
Storage Temperature
Reliability
Ts
MTBF
Mechanical Shock
—
Mechanical Vibration
—
Weight
Flammability
—
—
Conditions
Min
Ta =+60°C, 200LFM
Ta =+25°C, natural convection
Over Io Range
–40° >Ta > +85°C
Over Vin range
Over Io range
Includes set-point, line, load,
–40° >Ta > +85°C
Io =8A
Over Vin range
Pin 8 to GND
pins 8 & 14 connected
Over Vin range
—
Per Bellcore TR-332
50% stress, Ta =40°C, ground benign
Per Mil-Std-883D, method 2002.3,
1mS, half-sine, mounted to a fixture
Per Mil-Std-883D, method 2007.2,
20-2000Hz, soldered in a PC board
—
Materials meet UL 94V-0
Vo =1.8V
Vo =1.2V
PT6703 SERIES
Typ
Max
Units
0.1 (1)
0.1 (1)
3.1
—
—
—
—
—
—
—
±10
±0.5
±2.5
±2.5
13.0
13.0
5.5
±20 (2)
—
±5
±10
—
±25
—
—
—
—
—
—
—
300
86
81
25
50
±100
20
350
—
—
—
—
—
—
400
mVpp
µs
mV
A
kHz
—
–0.2
—
—
330 (4)
-40
—
0.4
10
20
—
—
Open (3)
1.0
–
30
15,000
+85 (5)
µA
mA
µF
°C
A
VDC
mV
%Vo
mV
mV
mV
%
V
-40
—
+125
°C
4.7
—
—
106 Hrs
—
500
—
G’s
—
15
—
G’s
—
26
—
grams
Notes: (1) ISR-will operate down to no load with reduced specifications.
(2) If the remote sense ground is not used, pin 13 must be connected to pin 14 for optimal output voltage accuracy.
(3) The Standby control (pin 8) has an internal pull-up, and if left open-circuit the module will operate when input power is applied. A small low-leakage (<100nA)
MOSFET must be used to control this input. The open-circuit voltage is less than 10V. See application notes for further information.
(4) For operation below 0°C, Cin and Cout must have stable characteristics. Use either low ESR tantalum or Oscon® capacitors.
(5) See Safe Operating Area curves.
External Capacitors: The PT6703 requires a minimum ouput capacitance of 330µF, and a minimum input capacitance of 1,000µF for proper operation. The input
capacitance must be rated for a minimum of 1.0Arms of ripple current. For transient or dynamic load applications, additional input and output capacitance may be
required.The maximum allowable output capacitance is 15,000µF. For more information refer to the application note regarding capacitor selection for this product.
Input Inductor: An input filter inductor is optional for most applications. The inductor must be sized to handle 10.0ADC with a typical value of 1µH.
For technical support and more information, see inside back cover or visit www.ti.com
Typical Characteristics
PT6703 Series
20-Watt 48V-Input Isolated
DC/DC Converter
PT6703 Characterization, Vin =3.3V
(See Note A)
PT6703 Characterization, Vin =5V
Efficiency vs Output Current
Efficiency vs Output Current
90
90
VIN
80
1.8V
1.2V
70
Efficiency - %
100
Efficiency - %
100
60
VIN
80
1.8V
1.2V
70
60
50
50
0
2
4
6
8
10
12
0
2
4
Iout (A)
25
20
20
VIN
15
1.8V
1.2V
10
Ripple - mV
Ripple - mV
8
10
12
Ripple vs Output Current
25
5
VIN
15
1.8V
1.2V
10
5
0
0
0
2
4
6
8
10
12
0
2
4
Iout (A)
6
8
10
12
Iout (A)
Power Dissipation vs Output Current
Power Dissipation vs Output Current
6
6
5
5
VIN
1.8V
1.2V
3
4
Pd - Watts
4
Pd - Watts
6
Iout (A)
Ripple vs Output Current
VIN
1.8V
1.2V
3
2
2
1
1
0
0
0
2
4
6
8
10
12
0
2
4
Iout (A)
6
8
10
12
Iout (A)
Safe Operating Area Curve
Safe Operating Area Curve
(See Note B)
(See Note B)
PT6703, @Vin =5.0V
PT6703, @Vin =3.3V
90
90
80
Airflow
70
200LFM
120LFM
60LFM
Nat conv
60
50
40
Ambient Temperature (°C)
80
Ambient Temperature (°C)
(See Note A)
Airflow
70
200LFM
120LFM
60LFM
Nat conv
60
50
40
30
30
20
20
0
2
4
6
8
10
12
Iout (A)
0
2
4
6
8
10
Iout (A)
Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures
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12
Application Notes
PT6701/6702/6703, & PT6721/6722
Operating Features of the Programmable
PT6700 “Excalibur™” Series ISRs
Power Good
Programmable versions of the PT6700 Series regulators
incorporate a PWR Good output (pin 2). This output is
open-drain and generates an acitve-high signal when the
sensed output from the ISR is within a nominal ±10% of
the programmed set point. When the regulated output is
outside this range, pin 2 asserts a logic low (typically <0.1V). A
10-kΩ pull-up resistor to a valid bus voltage is required.
If the power good feature is not used, the pull-up resistor
can be omitted. The maximum voltage that may be applied to the pull-up resistor is 15V.
Figure 1
OVP DRV
7 6 5 4 3
VID4 - VID0
10-12
5V
R1
10k
+
1
OVP
23
SNS(+)
PT6700
Vin
Pwr
Good
2
STBY
8
GND
14-18
C in
19-22
Vo
V o =2.5V
SNS(-)
13
+
C out
L
O
A
D
Pwr
Good
Q1
BSS138
Inhibit
COM
COM
Over-Voltage Protection (OVP)
The PT6700 programmable regulators also incorporate
an OVP function. The OVP DRV (pin 1) normally has a
logic low output (typically <0.1V). When the ISR’s sensed
output exceeds the programmed output setting by 15%,
pin 1 produces a 60mA, +12V drive signal. This drive
signal can trigger an SCR, which can be used to disable
the input voltage (via a fuse), or alternatively interface to
another external monitoring device. When the ISR output
voltage returns to within 15% of its programmed setting,
pin 1 reverts back to its low state. If the OVP function is
not used, pin 1 may be left open circuit.
Stand-By Function
The PT6700 series ISRs incorporate a standby function.
This feature may be used for power-up sequencing, or
wherever there is a requirement for the output voltage
to be controlled by external circuitry.
If the STBY* input (pin 8) is left open-circuit the regulator
operates normally, providing a regulated output when a
valid supply voltage is applied to Vin (pins 10-12) with
respect to GND (pins 14-18). Connecting pin 8 to ground1
places the regulator in standby mode 2, and reduces the input
current to typically 20mA (30mA max). Applying a ground
signal to pin 8 prior to power-up, will disable the output
during the period that input power is applied. To ensure
that the regulator output is properly enabled, pin 8 must
be open circuit.
Notes:
1. The standby on a PT6700 series regulator must be controlled
with an open-drain low-leakage (<100nA) MOSFET (See
fig. 1). Table 1 gives the threshold requirements. Do Not use a
pull-up resistor. The control input has an open-circuit voltage of
between 4Vdc and 5Vdc. To set the regulator output to zero,
the control pin must be “pulled” to less than 1.0Vdc by sinking
current to ground.
2. When placed in the standby mode, the regulator output may
assert a low impedance to ground. If an external voltage is
applied to the output, it will sink current and possibly overstress the part.
Turn-On Time
Turning Q1 in Figure 1 off, removes the low-voltage signal
at pin 8. After a 10-15ms delay the regulator output
rises and reaches full output voltage within 30ms. Fig. 2
shows the typical waveforms of a PT6701 following the
prompt turn-off of Q1 at time t =0 secs. The output voltage was set to 2.5V, and the waveforms were measured
with a 5V input source, and 10A resistive load.
Figure 2
Vout (2V/Div)
Table 1 Standby Control Requirements
Parameter
Min
Typ
Enable
Open Cct. 1
Disable
-0.1V
Istby
0.4V
2
Iin (5A/Div)
Max
1.0V
VPWGD (10V/Div)
10µA
0
5
10
15
20
25
30
35
t (milli - secs)
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40
Application Notes continued
PT6701/6702/6703, & PT6721
Pin-Coded Output Voltage Adjustment on the NonIsolated “Excalibur™” Series ISRs
The PT6701/6702/6703, and PT6721/6722 Excalibur™
ISRs incorporate a pin-coded control to program the
output voltage. Depending on the resolution and adjustment range, there are up to five control pins. They are
identified VID0–VID4 (pins 3–7) respectively. When the
control pins are left open-circuit the ISR output will
regulate at its factory trimmed output voltage. By selectively grounding VID0-VID4, the output voltage can be
programmed in incremental steps over the specified output voltage range. The program code and output voltage
range of these ISRs may also be compatible with the “Voltage ID” specification defined for popular microprocessors.
Refer to Figure 1 below for the connection schematic, and
the applicable Data Sheet for the program code.
Notes:
1. The programming convention is as follows:Logic 0:
Connect to pin13 (Remote Sense Ground).
Logic 1:
Open circuit/open drain (See notes 2, & 4)
2. Do not connect pull-up resistors to the voltage
programming pins.
3. To minimize output voltage error, always use pin 13
(Remote Sense Ground) as the logic “0” reference. While
the regular ground (pins 14-18) can also be used for
programming, doing so will degrade the load regulation of
the product.
4. If active devices are used to ground the voltage control
pins, low-level open drain MOSFET devices should be
used over bipolar transistors. The inherent Vce(sat) in
bipolar devices introduces errors in the device’s internal
voltage control circuit. Discrete transistors such as the
BSS138, 2N7002, IRLML2402, or the 74C906 hex opendrain buffer are examples of appropriate devices.
Active Voltage Programming:
Special precautions should be taken when making changes
to the voltage control progam code while the unit is
powered. It is highly recommended that the ISR be either
powered down or held in standby. Changes made to the
program code while Vout is enabled induces high current
transients through the device. This is the result of the
electrolytic output capacitors being either charged or discharged to the new output voltage set-point. The transient
current can be minimized by making only incremental
changes to the binary code, i.e. one LSB at a time. A
minimum of 100µs settling time between each program
state is also recommended. Making non-incremental
changes to VID3 and VID4 with the output enabled is
discouraged. If they are changed, the transients induced
can overstress the device resulting in a permanent drop
in efficiency. If the use of active devices prevents the
program code being asserted prior to power-up, pull pin
8 (STBY) to the device GND during the period that the
input voltage is applied to Vin. Releasing pin 8 will then
allow the device output to initiate a soft-start power-up
to the new program voltage.
Figure 1
7
V in
10-12
1 µH
(Optional)
6 5 4 3
VID4 - VID0
1
OVP
23
SNS(+)
PT6700
Vin
Pwr
Good
2
STBY
GND
14-18
8
Vo
19-22
V out
SNS(-)
13
+
+
C in
C out
L
O
A
D
Q1
STBY
COM
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COM
Application Notes
PT6703
Capacitor Recommendations for the Non-Isolated
13-A Excalibur™ Series of Regulators
Tantalum Characteristics
Tantalum capacitors with a minimum 10V rating are
recommended on the output bus, but only the AVX TPS
Series, Sprague 594/595 Series, or Kemet T495/T510
Series. The AVX TPS Series, Sprague Series or Kemet
Series capacitors are specified over other types due to
their higher surge current, excellent power dissipation and
ripple current ratings. As a caution, the TAJ Series by AVX
is not recommended. This series exhibits considerably higher
ESR, reduced power dissipation and lower ripple current
capability. The TAJ Series is a less reliable compared to the
TPS series when determining power dissipation capability.
Input Capacitors
The recommended input capacitance is determined by the
1.0 ampere minimum ripple current rating and 1000µF
minimum capacitance. Capacitors listed below must be
rated for a minimum of 2x the input voltage with +5V
operation. Ripple current and ≤100mΩ Equivalent Series
Resistance (ESR) values are the major considerations along
with temperature when selecting the proper capacitor.
Output Capacitors
The minimum required output capacitance is 330µF with a
maximum ESR less than or equal to 100mΩ. Failure to
observe this requirement may lead to regulator instability
or oscillation. Electrolytic capacitors have poor ripple
performance at frequencies greater than 400kHz, but
excellent low frequency transient response. Above the
ripple frequency ceramic decoupling 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 below.
Capacitor Table
Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The suggested minimum quantities per regulator for both the input and output buses are identified.
This is not an extensive capacitor list. The table below is a
suggested selection guide for input and output capacitors. Other
capacitor vendors are available with comparable RMS ripple
current rating and ESR (Equivalent Series Resistance at 100kHz).
These critical parameters are necessary to insure both optimum regulator performance and long capacitor life.
Table 1 Capacitors Characteristic Data
Capac i t or
Vendor
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
Panasonic
FC Surface Mtg
10V
35V
1000
330
0.065Ω
0.065Ω
1205mA
1205mA
12.5x16.5
12.5x16.5
1
1
1
EEVFC1A102LQ
EEVFC1V331LQ
FC Radial
25V
10V
330
1200
0.090Ω
0.065Ω
765mA
1205mA
10x12.5
12.5x15
1
1
1
EEUFA1E331
EEUFC1A122S
United
Chemi -Con
LFZ Radial
FX Surface Mtg
25V
10V
6.3V
10V
330
1000
1000
680
0.090Ω
0.068Ω
0.013Ω
0.015Ω/2=0.007Ω
760mA
1050mA
4935mA
>7000mA
10x12.5
10x16
10x10.5
10X10.5
1
1
2
1
1
1
1
LXZ25VB331M10X12LL
LXZ35VB102M10X16LL
6FX1000M(Vin 3.3V)
10FX680M(Os-con)
Nichicon
PL Series
PM Series
25V
10V
25V
330
1000
330
0.095Ω
0.065Ω
0.095Ω
750mA
1040mA
750mA
10x15
12.5x15
10x15
1
1
1
1
UPL1E331MPH6
UPL1A102MHH6
UPM1E331MPH6
Oscon SS
SV
10V
10V
330
330
0.025Ω/3=0.008Ω
0.020Ω/3=0.007Ω
>7000mA
>7000mA
10x10.5
10.3x12.6
3
3
1
1
10SS330M
10SV330M(Surface Mtg)
AVX
Tanatalum
TPS- Series
10V
10V
330
330
0.100Ω/3=0.034Ω
0.060Ω/3=0.02Ω
>3500mA
>3500mA
7.0Lx
5.97Wx
3.45H
3
3
1
1
TPSV337M010R0100
TPSV337M010R0060
Vishay/Sprague
Tantalum
595D/594D
10V
330
0.045Ω/3=0.015Ω
>4600mA
1
680
0.090Ω/4=0.023Ω
>2500mA
7.2L x
6.0W x
3.5H
3
10V
2
1
594D337X0010R2T
Surface Mount
595D687X0010R2T
Kemet
Tantalum
T510/T495
Series
10V
330
0.035Ω/3=0.012Ω
>5000mA
10V
220
0.070Ω/5=0.035Ω
>3000mA
Sanyo Poscap
TPB
10V
220
0.040Ω/5=0.008Ω
>3000mA
4.3Wx7.3L
x4.0H
7.2L x
4.3W x
3.1H
Vendor Number
3
1
T510X337M010AS
5
2
T495X227M010AS
Surface Mount
5
2
10TPB220M
Surface Mount
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