TPS51727RHAR datasheet(9/42 Pages) TI

Part #	TPS51727RHAR

Description	DUAL-PHASE, ECO-MODE??STEP-DOWN POWER MANAGEMENT IC FOR 50-A APPLICATIONS

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Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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TPS51727

www.ti.com .............................................................................................................................................................. SLUS806A – APRIL 2008 – REVISED MAY 2008

TERMINAL FUNCTIONS (continued)

TERMINAL

I/O

DESCRIPTION

NAME

NO.

OSRSEL

38

I

Overshoot reduction (OSR) setting. The OSR threshold can be selected or OSR can be disabled.

PAD

-

Thermal pad; Connect directly to system GND plane with multiple vias.

PCNT

13

I

Phase control input. 0.5-V threshold logic. High is dual phase mode.

PD1

12

I

Test pin. Tie to GND.

PD2

15

PGOOD

31

O

Open-drain PWRGD output.

PGND

25

-

Synchronous N-channel MOSFET gate drive return.

PMON

35

O

Power monitor output. VPMON = VOUT × ΣVISENSE × K. See applications section for more detail.

SLP

32

I

Sleep mode control. 3.3-V I/O Level; disallows switching when entering sleep mode.

THAL

11

O

Thermal alarm; open drain output, Active low. 1-ms de-glitch filter.

Thermal sensor input. An internal 60-

µA current source flows into an NTC thermistor connected to GND. The

THRM

10

I/O

voltage threshold is 0.75-V. Also is a ‘Faults off’ input, (VTHRM = VV5FILT) for debug mode.

On-time selection pin. The operating frequency can be set between 200-kHz and 500-kHz in 100-kHz steps.

TONSEL

37

I

Frequency can be changed during operation.

Overcurrent protection (OCP) setting. The valley current limit at the CS inputs can be selected in a range

TRIPSEL

36

I

between approximately 10-mV to 20-mV.

V5IN

26

I

5-V power input for drivers; bypass to PGND with

≥ 1

µF ceramic capacitor.

5-V power input for control circuitry. Has internal, 3-

Ω resistor to 5VFILT. Bypass to GND with ≥ 1-µF

V5FILT

40

I

ceramic capacitor.

VBST1

22

I

Top N-channel MOSFET bootstrap voltage inputs.

VBST2

29

Voltage sense line tied directly to VOUT. Tie to VOUT with a 100-

Ω resistor to close feedback when voltage

VFB

9

I

sensing through a socket.

VID0

20

VID1

19

VID2

18

I

DAC programming bits most significant bit (MSB) to least significant bit (LSB). 0.5-V threshold logic.

VID3

17

VID4

16

VREF

2

O

1.7-V, 250-

µA voltage reference. Bypass to GND with a 0.22-µF ceramic capacitor.

9

Product Folder Link(s): TPS51727

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