Step-Down Controllers with Prebias Startup,

Lossless Sensing, Synchronization, and OVP

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

POK

Power-OK Threshold

typical hysteresis is 3%

88

91

94

%

POK Output Voltage, Low

25

200

mV

POK Leakage Current, High

0.001

1

µA

OVERVOLTAGE PROTECTION (OVP)

Output Overvoltage Fault-Trip level

Rising edge compared to regulation set point;

triggers after one or two clock cycles

+110

+115

+120

%

MODE CONTROL

MODE Logic-Level Low

3V

0.4

V

MODE Logic-Level High

3V

1.8

V

-1

+1

MODE Input Current

MODE = VL

5

10

µA

SHUTDOWN CONTROL

EN Logic-Level Low

3V

0.45

V

EN Logic-Level High

3V

2

V

-1

+4

EN Input Current

1.5

6

µA

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

MAX

UNITS

Operating Input Voltage Range

3.0

13.2

V

Quiescent Supply Current

3

mA

EN = GND, MODE = GND, IN not connected to VL

10

Shutdown Supply Current

EN = GND, VL = IN, MODE = GND

20

µA

VL Undervoltage-Lockout Trip Level

2.52

2.88

V

(Note 1)

0.8

V

VL Output Voltage

4.5

5.5

V

VL Output Current

75

mA

VOLTAGE REFERENCE

SS Shutdown Resistance

100

Ω

SS Soft-Start Current

14

34

µA

ERROR AMPLIFIER

FB Regulation Voltage

0.788

0.808

V

Transconductance

70

160

µS

COMP Shutdown Resistance

100

Ω

FB Input Leakage Current

100

nA

FB Input Common-Mode Range

-0.1

+0.9

V