Datasheet > LTC1174CN8

LTC1174CN8

更新时间： 2024-02-24 10:20:20

品牌	Logo	应用领域
凌特 - Linear		转换器
页数	文件大小	规格书
16页	354K
描述
High Efficiency Step-Down and Inverting DC/DC Converter

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数据手册

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LTC1174CN8 数据手册

LTC1174

LTC1174-3.3/LTC1174-5

U W

TYPICAL PERFOR A CE CHARACTERISTICS

DC Supply Current

Supply Current in Shutdown

Efficiency vs Input Voltage

500

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

= 0V

PGM

ACTIVE MODE

= 5V

OUT

SHUTDOWN = 0V

450

400

350

300

250

200

150

100

L = 100µH

= 25°C

= V

PGM

COIL = CTX100-4

CURRENT INTO PIN 6 ONLY

= 100mA

LOAD

= 0V

PGM

= 300mA

LOAD

= V

PGM

SLEEP MODE

= 25°C

10 11 12 13 14

INPUT VOLTAGE (V)

1174 G12

1174 G10

1174 G11

Operating Frequency

vs V_IN– V_OUT

Switch Resistance vs

Input Voltage

Off-Time vs Output Voltage

1.7

1.6

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

2.0

1.5

1.0

0.5

= 25°C

= 5V

OUT

= 25°C

= 70°C

LTC1174HV

LTC1174

LTC1174-5

LTC1174HV-5

LTC1174-3.3

LTC1174HV-3.3

10 12 14 16 18 20

INPUT VOLTAGE (V)

1174 G14

OUTPUT VOLTAGE (V)

(V – V ) VOLTAGE (V)

OUT

1174 G15

1174 G13

PI FU CTIO S

SW(Pin5):DrainoftheP-ChannelMOSFETSwitch.Cathode

V_OUT(V_FB)(Pin1):FortheLTC1174,thispinconnectstothe

main voltage comparator’s input. On the LTC1174-3.3 and

LTC1174-5 this pin goes to an internal resistive divider

which sets the output voltage.

of Schottky diode must be closely connected to this pin.

V_IN(Pin 6): Input Supply Voltage. It must be decoupled

close to ground pin 4.

LB_OUT(Pin 2): Open Drain of an N-Channel Pull-Down. This

pin will sink current when pin 3 (LB_IN) goes below 1.25V.

During shutdown this pin goes to high impedance.

I_PGM(Pin 7): Selects the Current Limit of the P-Channel

Switch. With I_PGM= V_IN, the current trip point is 600mA and

with I_PGM= 0V, the current trip value is reduced to 340mA.

LB_IN(Pin 3): The “–” Input of the Low-Battery Voltage

Comparator. The “+” input is connected to a reference

voltage of 1.25V.

SHUTDOWN (Pin 8): Pulling this pin to ground keeps the

internal switch off and puts the LTC1174 in micropower

shutdown.

GND (Pin 4): Ground Pin.

1 2 3 456 7 8...16

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