LT1432-3.3 Ver la hoja de datos (PDF) - Linear Technology

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Fabricante

LT1432-3.3

3.3V High Efficiency Step-Down Switching Regulator Controller

Linear Technology 

LT1432-3.3

ELECTRICAL CHARACTERISTICS

Operating parameters in standard circuit configuration.

VIN = 7V, IOUT = 0, unless otherwise noted. These parameters guaranteed where indicated, but not tested.

PARAMETER

Burst Mode Operation Quiescent Input Supply Current

Burst Mode Operation Output Ripple Voltage

Normal Mode Equivalent Input Supply Current

Normal Mode Minimum Operating Input Voltage

Burst Mode Operation Minimum Operating Input Voltage

Efficiency

Load Regulation

CONDITIONS

IOUT = 0

IOUT = 50mA

Extrapolated from IOUT = 20mA

100mA < IOUT < 1.5A

5mA < IOUT < 50mA

Normal Mode

IOUT = 0.5A

Burst Mode Operation IOUT = 25mA

Normal Mode

50mA < IOUT < 2A

Burst Mode Operation 0 < IOUT < 50mA

MIN TYP MAX UNITS

1.6 2.2

mA

80

mVp-p

120

mVp-p

3.0

mA

4.5

V

4.1

V

86

%

70

%

5

15

mV

30

mV

The q denotes specifications which apply over the full operating

temperature range.

Note 1: Does not include current drawn by the power IC. See operating

parameters in standard circuit.

Note 2: Breakdown voltage on the Mode pin is 7V. External current must

be limited to value shown.

Note 3: Current limit sense voltage temperature coefficient is +0.33%/°C

to match TC of copper trace material.

Note 4: VOUT pin switched from 3.6V to 3.0V.

EQUIVALE T SCHE ATIC

D2

VIN

VSW

VIN

LT1271

FB

OPTIONAL

CONNECTION

OF D2

VC

GND

3.3V

VLIM 1

VOUT

2

60mV

3 VIN

V+

4

6 VC

DIODE

5

+–

S1**

S3*

* S3 IS CLOSED ONLY DURING START-UP.

** S1 AND S2 ARE SHOWN IN NORMAL

MODE. REVERSE FOR Burst Mode

OPERATION.

S2**

MODE

CONTROL

Figure 2

MODE

8

7

GND

LT1432-3.3 F02

3

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