LOGIC

and

CONTROL

5.5V or 7.5V

LDO

R

S

1.22V

OSC/PLL

1.21V

FB

Reverse

Current

Detect

3.2µA

SS

COMP

FB

RT/CLK

EN

AGND

PGOOD

PGND

LDRV

VCC

SW

HDRV

BOOT

VIN

ISNS-

ISNS+

OVP

5µA

1.8µA

TPS43061

only

O

1.098V

1.342V

Slope

Compensation

TPS43060

TPS43061

www.ti.com

SLVSBP4A – DECEMBER 2012 – REVISED DECEMBER 2012

PIN FUNCTIONS (continued)

PIN

DESCRIPTION

NAME

NO.

Output of an internal LDO and power supply for internal control circuits and gate drivers. VCC is

VCC

10

typically 7.5V for the TPS43060 and 5.5 V for the TPS43061. Connect a low ESR ceramic capacitor

from this pin to PGND. The recommended capacitance range is from 0.47 µF to 10µF.

Bootstrap capacitor node for high-side MOSFET gate driver. Connect the bootstrap capacitor from this

BOOT

11

pin to the SW pin. For the TPS43060, also connect a bootstrap diode from VCC to BOOT.

Switching node of the boost converter. Connect this pin to the junction of the drain of the low side

SW

12

MOSFET, the source of high side synchronous MOSFET and the inductor.

High side gate driver output. Connect this pin to the gate of the high side synchronous rectifier

HDRV

13

MOSFET. When VIN bias is removed, this pin is connected to SW through an internal 200 k

Ω resistor.

Power good indicator. This pin is an open-drain output. A 10 k

Ω pull-up resistor is recommended

PGOOD

14

between PGOOD and VCC or an external logic supply pin.

Enable pin with internal pull-up current source. Floating this pin will enable the IC. Pull below 1.2 V to

EN

15

enter low current standby mode. Pull below 0.4 V to enter shutdown mode. The EN pin can be used to

implement adjustable undervoltage lockout (UVLO) using two resistors.

Analog signal ground of the IC. AGND should be connected to PGND at a single point on printed circuit

AGND

16

board.

The PowerPAD should be connected to AGND. If possible, use thermal vias to connect to an internal

PowerPAD

17

ground plane for improved power dissipation.

FUNCTIONAL BLOCK DIAGRAM

Copyright © 2012, Texas Instruments Incorporated

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