LT3150 View Datasheet(PDF) - Linear Technology

Part Name

Description

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LT3150

Fast Transient Response, Low Input Voltage, Very Low Dropout Linear Regulator Controller

Linear Technology 

LT3150

TYPICAL PERFOR A CE CHARACTERISTICS Linear Regulator Controller

SHDN2 Source Current

vs Temperature

–10

– 11

– 12

– 13

– 14

– 15

– 16

– 17

– 18

– 19

– 20

–75 – 50 –25 0 25 50 75 100 125 150 175

TEMPERATURE (°C)

3150 G18

SHDN2 High Clamp Voltage

vs Temperature

2.1

2.0

1.9

1.8

1.7

1.6

1.5

–75 – 50 –25 0 25 50 75 100 125 150 175

TEMPERATURE (°C)

3150 G20

SHDN2 Low Clamp Voltage

vs Temperature

0.25

0.20

0.15

0.10

0.05

0

– 75 – 50 – 25 0 25 50 75 100 125 150 175

TEMPERATURE (°C)

3150 G19

SHDN2 Hysteresis vs Temperature

150

140

130

120

110

100

90

80

70

60

50

–75 – 50 –25 0 25 50 75 100 125 150 175

TEMPERATURE (°C)

3150 G21

PI FU CTIO S

SW (Pin 1): Boost Converter Switch Pin. Connect induc-

tor/diode here. Minimize trace area at this pin to keep EMI

down.

SWGND (Pin 2): Switch Ground. Tie directly to the local

ground plane and the GNDs at Pins 6 and 15.

VIN1 (Pin 3): Boost Converter Input Supply Pin. Must be

locally bypassed.

SHDN2 (Pin 4): This is a multifunction shutdown pin that

provides GATE drive latchoff capability. A 15µA current

source, that turns on when current limit is activated,

6

charges a capacitor placed in series with SHDN2 to GND

and performs a current limit time-out function. The pin is

also the input to a comparator referenced to VREF (1.21V).

When the pin pulls above VREF, the comparator latches the

gate drive to the external MOSFET off. The comparator

typically has 100mV of hysteresis and the SHDN2 pin can

be pulled low to reset the latchoff function. This pin

provides overvoltage protection or thermal shutdown

protection when driven from various resistor divider

schemes.

3150f

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