TEXAS INSTRUMENTS SLTS163 Technical data

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PT7615—5V

20-A Low-Voltage Programmable
Integrated Switching Regulator

Description

The PT7615 power module is a 20-A
fully integrated switching regulator (ISR)
housed in a 27-pin aluminum SIP package.
Operating from a 5V-input bus, the
PT7615 produces a tightly regulated
supply voltage that is programmable over
the range, 1.075V to 1.85V. The output
voltage is selected via a 5-bit code. The
code adjusts the voltage in steps of 25mV
and is VRM 9.0 compatible.

This regulator is most suitable for
applications that employ microprocessor
and DSP products that require core supply
voltages as low as 1.075V.

The PT7615 includes a Shutdown
control, Differential Remote Sense, and
Short-Circuit Protection.

Features

• Single-Device: +5V Input

• 20A Output

• 5-bit Programmable:

1.075V to 1.85V (25mV Steps)

• VRM 9.0 Compatible

• High Efficiency (87%)

Ordering Information

PT7615o = 1.075 to 1.85Volts
PT7743o = 20A Booster

PT Series Suffix

Case/Pin Order Package
Configuration Suffix Code

Vertical N (EHD)
Horizontal A (EHA)
SMD C (EHC)

(Reference the applicable package code draw­ing for the dimensions and PC board layout)

(PT1234x )

(Revised 12/13/2001)

• Differential Remote Sense

• Short-Circuit Protection

• Compatible with PT7743

20A “Current Booster”

Pin-Out Information

Pin Function

1 VID0
2 VID1
3 VID2
4 VID3
5 STBY *
6 VID4
7V

in

8V

in

9V

in

10 V

in

11 V

in
12 Remote Sense (–)
13 GND
14 GND

For STBY* pin: open =output enabled

ground =output disabled.

Pin Function

15 GND
16 GND
17 GND
18 GND
19 GND
20 V
21 V
22 V
23 V
24 V
25 V
26 Remote Sense (+)
27 Sync Out

SLTS163

out
out
out
out
out
out

Standard Application

For technical support and more information, see inside back cover or visit www.ti.com

VID0
VID1
VID2
VID3
VID4

V

IN

SYNC OUT

GND

STBY*

PROGRAMMING PINS

L1

H

1

7-11

+

C

IN

4321 26

6

PT7615

27

REMOTE SENSE(+)

20-25

125 13-19

REMOTE SENSE(–)

V

OUT

+

C

OUT

GND

Cin= Required 1500µF electrolytic
C

= Required 330µF electrolytic

out

L1= Optional 1µH input choke

L
O
A
D

PT7615—5V

20-A Low-Voltage Programmable
Integrated Switching Regulator

Programming Information

VID3 VID2 VID1 VID0 Vout Vout

1111 1.075V 1.475V
1110 1.100V 1.500V
1101 1.125V 1.525V
1100 1.150V 1.550V
1011 1.175V 1.575V
1010 1.200V 1.600V
1001 1.225V 1.625V
1000 1.250V 1.650V
0111 1.275V 1.675V
0110 1.300V 1.700V
0101 1.325V 1.725V
0100 1.350V 1.750V
0011 1.375V 1.775V
0010 1.400V 1.800V
0001 1.425V 1.825V
0000 1.450V 1.850V

Logic 0 = Pin 12 potential (Rem Sense Gnd)
Logic 1 = Open circuit (no pull-up resistors)
VID4 may not be changed while the unit is operating.

VID4=1 VID4=0

Specifications (Unless otherwise stated, T

=25°C, Vin =5V, Cin =1,500µF, C

a

20-A Programmable SIP Family

Product Voltage Description Method Range

PT7709 5V VID 5-Bit 1.3V– 3.5V
PT7708 3.3V VID 4-Bit 1.3V– 2.05V
PT7615 5V VID 5-Bit 1.075V–1.85V
PT7742 3.3V Booster — —
PT7743 5V Booster — —

out

Input Adjust Output

=330µF, and Io =Iomax)

PT7615

Characteristics Symbols Conditions Min Typ Max Units

Output Current Io Ta = +60°C, 200 LFM, pkg N 0.1

Ta = +25°C, natural convection 0.1

(1)

—20A

(1)

—20

Input Voltage Range Vin Over Io range 4.5 — 5.5 V

Set-Point Voltage Tolerance Vo tol — ±10 ±25

Temperature Variation Reg

temp

–40°C ≤Ta ≤ +85°C — ±1.5 — %V

(2)

mV

Line Regulation Regline Over Vin range — ±5 ±10 mV

Load Regulation Regload Over Io range — ±5 ±10 mV
Total Output Voltage Variation ∆V

Efficiency η I

tol Set-point, line, load

o

–40°C ≤Ta ≤ +85°C

o = 10A Vo = 1.8V — 87 —

I

o = 20A Vo = 1.8V — 82 —

—±2±3%V

o = 1.5V — 84 — %

V

Vo = 1.2V — 81 —

o = 1.5V — 79 — %

V

Vo = 1.2V — 75 —

Vo Ripple (pk-pk) Vr 20MHz bandwidth — 40 — mV

Transient Response ttr 1A/µs load step, 10A and 20A — 50 — µSec

Vos Vo over/undershoot — ±100 — mV

Short Circuit Threshold Isc (pk) — 32 — A

Switching Frequency ƒs Over Vin range 300 350 400 kHz

STBY* Input Requirements Referenced to GND

Input High Voltage V
Input Low Voltage V

Input Low Current I

IH
IL

IL

Pin 5 to GND — 0.3 — mA

2.0 —

-0.2 — 0.8

Open

(3)

V

Standby Input Current Iin standby Pin 5 to GND — 30 — mA

External Capacitance C

out

Operating Temperature Range Ta Over Vin Range –40 — +85

330

(4)

— 15,000 µF

(5)

°C

Storage Temperature Ts — -40 — +125 °C

Mechanical Shock Per Mil-STD-883D, Method 2002.3

Mechanical Vibration Per Mil-STD-883D, Method 2007.2, — 10 — G’s

1 msec, Half Sine, mounted to a fixture — 500 — G’s

20-2000 Hz, Soldered in a PC board

Weight — Vertical/Horizontal — 36 — grams

Flammability — Materials meet UL 94V-0

Notes:

(1) ISR-will operate down to no load with reduced specifications.
(2) If the remote sense is not used, pin 12 must be connected to pin 13 for optimum output voltage accuracy.
(3) The STBY* control (pin 5) has an internal pull-up. If it is left open-circuit, the module will operate when input power is applied. A low-leakage (<1µA)

MOSFET must be used to control this pin. The open-circuit voltage may be as high as Vin.
(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 or consult factory for the appropriate derating.

External Capacitors:

which must be rated for a minimum of 1.4Arms of ripple current. For transient or dynamic load applications, additional capacitance may be required. For further
information refer to the application note regarding capacitor selection for this product.

Input Filter:

The PT7615 require a minimum output capacitance of 330µF for proper operation. The PT7615 also requires an input capacitance of 1500µF,

An input filter inductor is optional for most applications. The inductor must be sized to handle 10ADC with a typical value of 1µH.

o

o

pp

For technical support and more information, see inside back cover or visit www.ti.com

PT7615—5V

)

)

)

)

)

20 Amp Low Voltage Programmable
Integrated Switching Regulator

T ypical Characteristics

PT7615 Characteristic Data, Vin =5.0 (See Note A)

Efficiency vs Output Current

90.0

80.0

70.0

Efficiency - %

60.0

50.0
048121620

Ripple vs Output Current

50

40

30

20

Ripple - mV

10

0

048121620

Iout (A

Iout (A

V

OUT

1.8

1.5

1.2

V

OUT

1.8

1.5

1.2

PT7615 Safe Operating Area, Vin =5.0 (See Note B)

PT7615; Vo =1.2V

90

80

70

60

50

40

Ambient Temperature (°C)

30

20

0 4 8 12 16 20

PT7615; Vo =1.8V

90

80

70

60

50

40

Ambient Temperature (°C)

30

20

0 4 8 12 16 20

Iout (A

Iout (A

Airflow

200LFM
120LFM
60LFM
Nat conv

Airflow

200LFM
120LFM
60LFM
Nat conv

Power Dissipation vs Output Current

8

6

4

Pd - Watts

2

0

048121620

Note A:

All characteristic data in the above graphs has been developed from actual products tested at 25°C. This data is considered typical for the ISR.

Note B:

SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.

Iout (A

V

OUT

1.8

1.5

1.2

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT7708/09, PT7615, PT7742/PT7743

Capacitor Recommendations for 20-A

Programmable Switching Regulators

Input Capacitors

The recommended input capacitance is determined by the

1.4 ampere minimum ripple current rating and 1500µF
minimum capacitance. Capacitors listed below must be

rated for a minimum of two times (2×) the input voltage
with +5V operation. Ripple current and ≤100mΩ ESR

(equivalent series resistance) 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
microprocessor high frequency noise components apparent
during higher current excursions. Preferred low ESR type
capacitor part numbers are identified in the Table 1 below.

Table 1 Capacitors Characteristic Data

Tantalum Characteristics

Tantalum capacitors with a minimum 10-V rating are
recommended on the output bus, but only the AVX TPS
Series, Sprague 594/595 Series, or Kemet T495/T510
Series. These AVX, Sprague, and Kemet 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 also less reliable compared to the TPS
series when determining power dissipation capability.

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. Capacitors from
other vendors are available with comparible specifications.
The RMS ripple current rating and ESR (Equivalent Series
Resistance at 100kHz) are the critical parameters necessary
to insure both optimum regulator performance and long
capacitor life.

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Note:

(N/R) is not recommended for this application, due to extremely low Equivalent Series Resistance (ESR)

V61
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V01
V61

V52
V61
V61

V01
V01
V52

V01
V01

V01
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V01
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830.0 Ω

560.0 Ω

090.0 Ω

230.0 Ω

480.0 Ω

830.0 Ω

480.0 ÷Ω 240.0=2 Ω

090.0 Ω

440.0 Ω

590.0 Ω

520.0 ÷Ω 600.0=4 Ω

20.0 ÷Ω 500.0=4 Ω

1.0 ÷Ω 20.0=5 Ω

60.0 Ω

540.0 ÷Ω 110.0=4 Ω

90.0 Ω

530.0 Ω

70.0 ÷Ω 530.0=2 Ω

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6HHM186A1LPU
6HHM281A1LPU

6HPM133E1LPU

M033SS01

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T2R0100X733D495
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For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

y

)

)

continued

PT7708/09, PT7615

Using the Standby Function on 20-A
Programmable Switching Regulators

For applications requiring On/Off control of the output
voltage, the 20-A programmable regulators incorporate
a standby function. This feature may be used for power­up/shutdown sequencing, or to change the output voltage
while input power is applied. See related note: “Pin-Coded
Output Voltage Adjustment of 20-A Programmable Regu­lators”

The standby function is provided by the STBY* control,
pin 5. If pin 5 is left open-circuit the regulator operates
normally, providing a regulated output whenever a valid
supply voltage is applied to V

(pins 7-11) with respect to

in

GND (pins 13-19). Connecting pin 5 to ground 1 will set

2

the regulator output to zero volts

. This places the regu­lator in standby mode, and reduces the input current to
typcially 30mA (60mA max). If a ground signal is applied
to pin 5 prior to power-up, the regulator output will be
held at zero volts during the period that input power is
applied.

The standby input must be controlled with an open­collector (or open-drain) discrete transistor (See Figure 1).
Table 1 gives the input requirements.

Table 1 Standby Control Input Requirements

Parameter Min Typ Max

Enable 2V Open Cct.
Disable –0.2V 0.8V
I

stby (low)

Vstby (o/c) V

in

(1, 2)

1

0.5mA

Figure 1

64321 26

5V

Inhibit

COM

VID4 - VID0

7-11

PT770x/PT761x

S

nch

STBY

Out

27

+

C

in

Q1
BSS138

GND

Rem Sns (+)

VoVin

Rem Sns (–)

125 13-19

20-25

C

Vo =3.3V

L

+

out

O
A
D

COM

Turn-On Time: Turning Q1 in Figure 1 off, removes the
low-voltage signal at pin 5 and enables the output.
Following a delay of approximately 10ms, the regulator

3

output voltage rises to full regulation within 30ms

.
Figure 2 shows the typical output voltage waveform of a
PT7709 following the turn-off of Q1 at time t =0 secs.
The output voltage is set to 3.3V by connecting VID0
(pin 1), VID2 (pin 3), and VID3 (pin 4) to the ‘Rem

*

Sns (–)’, (pin 12)

. The waveform was measured with a

+5V input source voltage, and 10-A resistive load.

Figure 2

Notes:

1. The Standby input must be controlled using an open­collector (or open-drain) discrete transistor.

Do Not use a
pull-up resistor. The control input has an open-circuit
voltage equal to V

. To set the regulator output to zero,

in

the control pin must be “pulled” to less than 0.8Vdc with a

0.5mA sink to ground.

2. When placed in the standby mode, the regulator output
discharges the output capacitance with a low impedance to
ground.

3. The turn-off time of Q1, or rise time of the standby input
is not critical with these regulators. Turning Q

off slowly,

1

over periods up to 100ms, will not affect regulator operation.
A slow turn-off time will merely increase both the initial
delay and rise-time of the output voltage.

For technical support and more information, see inside back cover or visit www.ti.com

Vo (2V / Div

Iin 10A / Div

0 5 10 15 20 25 30

t (milli - secs)

*

Consult the data sheet for details on other VID codes.

Application Notes

PT7708/09, PT7615

Pin-Coded Output Voltage Adjustment of
20-A Programmable Regulators

The 20-A family of programmable ISRs incorporate a pin­coded control to adjust the output voltage. This feature
uses the control pins VID0–VID4 (pins 1–6). When
the control pins are left open-circuit, the ISR output
regulates at its default output voltage. Each control pin
is internally connected to a precision resistor, which
when grounded applies a weighted change to the output
voltage. By selectively grounding VID0–VID4, the output
voltage of these ISRs can be programmed in incremental
steps over the module’s output voltage range. The program
codes and output voltage range offered by these ISRs are
compatible with the Voltage ID specifications defined by
Intel Corporation for VRMs (voltage regulator mod­ules). The codes are used by both the Pentium® and
Athlon® microprocessors. Refer to Figure 1 for the
connection schematic, and the respective device Data Sheet
for the programming code information.

Notes:

1. The programming convention is as follows:

Logic 0: Connect to pin 12 (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. Use pin 12 (Remote Sense Ground) as the logic “0”
reference. While the regular ground (pins 13-19) can also
be used for programming, doing so will degrade the load
reglation of the product. If the remote sense ground is
not used, pin 12 must be connected to pin 13 for
optimum output voltage accuracy.

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
divider network. Discrete transistors such as the BSS138,
2N7002, or IRLML2402 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 V

is enabled induces high current

out

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 non­incremental changes to VID3 or VID4 while the output
is enabled is discouraged. The transients induced can
overstress the device. If the program code cannot be
asserted priot to power-up, pull pin 5 (STBY) control to
GND during the period that the input voltage is applied
to Vin. Releasing pin 5 will then allow the device to per­form a soft-start to the programmed voltage. For more
information on the use of the Standby function, consult
the related application note, “Using the Standby Function
on 20-A Programmable Switching Regulators”

Figure 1

64321 26

VID4 - VID0

+5V

1µH
(Optional)

7-11

+

C

in

PT770X/PT761X

Synch

STBY

Out

27

GND

STBY

COM

For technical support and more information, see inside back cover or visit www.ti.com

SNS(+)

SNS(-)

20-25

VoVin

125 13-19

+

C

out

L

O

A

D

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