1

2

3

4

5

6

7

8

BOOT

VIN

EN

SS

PH

GND

COMP

VSENSE

TPS54331-Q1

SLVSAB5 – NOVEMBER 2010

www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

TJ = –40°C to 150°C, VIN = 3.5V to 28V (unless otherwise noted)

DESCRIPTION

TEST CONDITIONS

MIN

TYP

MAX

UNIT

PULSE SKIPPING ECO-MODE™

Pulse skipping Eco-mode™ switch current threshold

160

mA

CURRENT LIMIT

Current limit threshold

VIN = 12 V

3.5

5.8

A

THERMAL SHUTDOWN

Thermal Shutdown

165

°C

SLOW START (SS PIN)

Charge current

V(SS) = 0.4 V

2

mA

SS to VSENSE matching

V(SS) = 0.4 V

10

mV

DEVICE INFORMATION

PIN ASSIGNMENTS

TERMINAL FUNCTIONS

TERMINAL

DESCRIPTION

NAME

NO.

BOOT

1

A 0.1 mF bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor falls below the

minimum requirement, the high-side MOSFET is forced to switch off until the capacitor is refreshed.

VIN

2

Input supply voltage, 3.5 V to 28 V.

EN

3

Enable pin. Pull below 1.25V to disable. Float to enable. Programming the input undervoltage lockout with two

resistors is recommended.

SS

4

Slow start pin. An external capacitor connected to this pin sets the output rise time.

VSENSE

5

Inverting node of the gm error amplifier.

COMP

6

Error amplifier output, and input to the PWM comparator. Connect frequency compensation components to this pin.

GND

7

Ground.

PH

8

The source of the internal high-side power MOSFET.

4

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Product Folder Link(s): TPS54331-Q1