TPS70345, TPS70348

TPS70351, TPS70358

TPS70302

www.ti.com

SLVS285H – AUGUST 2000 – REVISED APRIL 2010

ELECTRICAL CHARACTERISTICS (continued)

Over recommended operating junction temperature range (TJ = –40°C to +125°C), VIN1 or VIN2 = VOUTX(nom) + 1V, IOUTX = 1mA,

EN = 0V, COUT1 = 22mF, and COUT2 = 47mF (unless otherwise noted).

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VOUT1 Terminal

VOUT1 UV comparator: positive-going

input threshold voltage at VOUT2 UV

80

83

86

%VOUT

comparator

%VOUT,

VOUT1 UV comparator: hysteresis

3

mV

VOUT1 UV comparator: falling edge

VSENSE1 decreasing below threshold

140

ms

deglitch

IO = 1 A, VIN1 = 3.2 V

TJ = +25°C

160

Dropout voltage(4)

mV

IO = 1 A, VIN1 = 3.2 V

250

Peak output current

2ms pulse width

1.2

A

Discharge transistor current

VOUT1 = 1.5 V

7.5

mA

VIN1/VIN2 Terminal

UVLO threshold

2.3

2.65

V

UVLO hysteresis

110

mV

FB Terminal

Input current: TPS70302

FB = 1.8 V

1

mA

(4)

Input voltage (VIN1 or VIN2) = VO(typ) – 100mV. For 1.5 V, 1.8 V and 2.5 V regulators, the dropout voltage is limited by input voltage

range. The 3.3 V regulator input is set to 3.2 V to perform this test.

TERMINAL FUNCTIONS

TERMINAL

I/O

DESCRIPTION

NAME

NO.

EN

7

I

Active low enable

GND

9

—

Regulator ground

GND/HEATSI

1, 12, 13, 24

—

Ground/heatsink

NK

MR1

6

I

Manual reset input 1, active low, pulled up internally

MR2

5

I

Manual reset input 2, active low, pulled up internally

NC

4, 17, 20

—

No connection

PG1

19

O

Open drain output, low when VOUT1 voltage is less than 95% of the nominal regulated voltage

RESET

18

O

Open drain output, SVS (power-on reset) signal, active low

Power-up sequence control: SEQ = High, VOUT2 powers up first; SEQ = Low, VOUT1 powers up

SEQ

8

I

first. SEQ terminal pulled up internally.

VIN1

2, 3

I

Input voltage of regulator 1

VIN2

10, 11

I

Input voltage of regulator 2

VOUT1

22, 23

O

Output voltage of regulator 1

VOUT2

14, 15

O

Output voltage of regulator 2

VSENSE2/FB2

16

I

Regulator 2 output voltage sense/regulator 2 feedback for adjustable

VSENSE1/FB1

21

I

Regulator 1 output voltage sense/regulator 1 feedback for adjustable

Copyright © 2000–2010, Texas Instruments Incorporated

Submit Documentation Feedback

7