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LT1432CN8

5V High Efficiency Step-Down Switching Regulator Controller

Linear Technology 

LT1432

ELECTRICAL CHARACTERISTICS

Operating parameters in standard circuit configuration.

VIN = +12V, IOUT = 0, unless otherwise noted. These parameters guaranteed where indicated, but not tested.

PARAMETER

CONDITIONS

MIN TYP MAX

Burst Mode Quiescent Input Supply Current

1.3

1.8

Burst Mode Output Ripple Voltage

Normal Mode Equivalent Input Supply Current

Normal Mode Minimum Operating Input Voltage

Burst Mode Minimum Operating Input Voltage

Efficiency

Load Regulation

IOUT = 0

IOUT = 50mA

Extrapolated from IOUT = 20mA

100mA < IOUT < 1.5A

5mA < IOUT < 50mA

Normal Mode IOUT = 0.5A

Burst Mode IOUT = 25mA

Normal Mode 50mA < IOUT < 2A

Burst Mode 0 < IOUT < 50mA

100

130

6

6

6.2

91

77

10

25

50

UNITS

mA

mVp-p

mVp-p

mA

V

V

%

%

mV

mV

EQUIVALE T SCHE ATIC

VIN

VSW

VIN

LT1271

FB

VC

GND

+5V

VLIM 1

VOUT

2

60mV

+–

3 VIN

V+

4

6 VC

DIODE

5

S1**

S3*

* S3 IS CLOSED ONLY DURING STARTUP.

** S1 AND S2 ARE SHOWN IN NORMAL

MODE. REVERSE FOR BURST MODE.

S2**

MODE

CONTROL

Figure 2

MODE

8

7

GND

LT1432 F02

3

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