NX2139A

4

Rev. 2.3

03/19/09

NOTE1: This parameter is guaranteed by design but not tested in production(GBNT).

PARAMETER

SYM

Test Condition

Min

TYP

MAX

Units

ENSW/MODE threshold and

bias current

PFM/Non Synchronous Mode

80%

VCC

VCC+0

.3V

V

Ultrasonic Mode

60%

VCC

80%

VCC

V

Synchronous Mode

Leave it open or use limits in

spec

2

60%

VCC

V

Shutdown mode

0

0.8

V

ENSW/MODE=VCC

5

uA

ENSW/MODE=GND

-5

uA

LDO Controller

Quiescent current

PWM OFF, LDOEN=HI,

IOUT=0mA

1

mA

LDOEN logic high voltage

2

V

LDOEN logic low voltage

0.8

V

LDOFB reference voltage

0.728

0.75

0.773

V

Output UVLO threshold

70

%Vref

Open loop gain

NOTE1

60

DB

LDOFB input bias current

1

uA

LDODrv sourcing current

LDOFB=0.72V

2

mA

LDODrv sinking current

LDOFB=0.78V

2

mA

LDO PGOOD threshold

90

%Vref

LDO PGOOD propagation

delay filter

NOTE1

2

us

LDO PGOOD impedance

13

ohm

Current Limit

Ocset setting current

20

24

28

uA

Over temperature

Threshold

NOTE1

155

Hysteresis

15

Under voltage

FB threshold

70

%Vref

Over voltage

Over voltage tripp point

125

%Vref

Internal Schottky Diode

Forward voltage drop

Forward current=50mA

500

mV

Input bias current