A1

A2

A3

B2

C2

B3

C3

B1

C1

A1

A2

A3

B2

C2

B3

C3

B1

C1

BOTTOM VIEW

TOP VIEW

Undervoltage

Lockout

Thermal

Shutdown

Softstart

Control

Logic

PMOS

Valley

Current

Sense

V

REF

VOUT

GND

SW

VIN

NMOS

Modulator

BP

EN

TPS61253, TPS61254, TPS61256, TPS61258

SLVSAG8B – SEPTEMBER 2011 – REVISED MAY 2012

www.ti.com

PIN ASSIGNMENTS

Table 1. TERMINAL FUNCTIONS

TERMINAL

I/O

DESCRIPTION

NAME

NO.

This is the mode selection pin of the device and is only of relevance when the device is disabled

(EN = Low). This pin must not be left floating and must be terminated. Refer to Table 3 for more

details.

BP

C3

I

BP = Low: The device is in true shutdown mode.

BP = High: The output is biased at the input voltage level with a maximum load current capability of

ca. 150mA. In standby mode, the device only consumes a standby current of 22µA (typ).

This is the enable pin of the device. Connecting this pin to ground forces the device into shutdown

EN

B3

I

mode. Pulling this pin high enables the device. This pin must not be left floating and must be

terminated.

GND

C1, C2

Ground pin.

SW

B1, B2

I/O

This is the switch pin of the converter and is connected to the drain of the internal Power MOSFETs.

VIN

A3

I

Power supply input.

VOUT

A1, A2

O

Boost converter output.

FUNCTIONAL BLOCK DIAGRAM

6

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