LTC1142_00 Datasheet(数据表) 5 Page

5 page

LTC1142/LTC1142L/LTC1142HV

LTC1142/LTC1142HV

SENSE+3 (Pin 1): The (+) Input to the 3.3V Section

Current Comparator. A built-in offset between Pins 1 and

28 in conjunction with RSENSE3 sets the current trip

threshold for the 3.3V section.

SHDN3 (Pin 2): When grounded, the 3.3V section oper-

ates normally. Pulling Pin 2 high holds both MOSFETs off

and puts the 3.3V section in micropower shutdown mode.

Requires CMOS logic-level signal with tr, tf < 1µs. Do not

“float” Pin 2.

PI FU CTIO S

SGND3 (Pin 3): The 3.3V section small-signal ground

must be routed separately from other grounds to the (–)

terminal of the 3.3V section output capacitor.

PGND3 (Pin 4): The 3.3V section driver power ground

connects to source of N-channel MOSFET and the (–)

terminal of the 3.3V section input capacitor.

NC (Pin 5): No Connection.

NDRIVE 3 (Pin 6): High Current Drive for Bottom N-Channel

MOSFET, 3.3V Section. Voltage swing at Pin 6 is from

ground to VIN3.

Operating Frequency vs

VIN – VOUT

Current Sense Threshold Voltage

Supply Current in Shutdown

Off-Time vs Output Voltage

DC Supply Current

Gate Charge Supply Current

INPUT VOLTAGE (V)

2.1

1.8

1.5

1.2

0.9

0.6

0.3

1142 G07

PER REGULATOR BLOCK

NOT INCLUDING

GATE CHARGE CURRENT

PINS 10, 24

ACTIVE MODE

SLEEP MODE

INPUT VOLTAGE (V)

1142 G08

PER REGULATOR BLOCK

PINS 10, 24

VSHUTDOWN = 2V

VIN – VOUT VOLTAGE (V)

1142 G09

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

°C

VOUT = 5V

TEMPERATURE (

°C)

175

150

125

100

1142 G12

100

MAXIMUM

THRESHOLD

MINIMUM

THRESHOLD

OUTPUT VOLTAGE (V)

1142 G11

VSENSE = VOUT

VOUT = 5V

VOUT = 3.3V

OPERATING FREQUENCY (kHz)

140

1142 G10

260

200

QN + QP = 100nC

QN + QP = 50nC

TYPICAL PERFOR A CE CHARACTERISTICS

LTC1142_00 Datasheet(数据表) 5 Page - Linear Technology

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