Datasheet > LTC1981_15

LTC1981_15

更新时间： 2022-02-26 13:14:13

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
8页	158K
描述
Single and Dual Micropower High Side Switch Controllers in SOT-23

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LTC1981_15 数据手册

LTC1981/LTC1982

PIN FUNCTIONS

GATE 2(Pin 4): Gate Drive Output to an External High Side

Switch. Fully enhanced by internal charge pump. Con-

trolled by the SHDN 2 input pin. Output voltage on this pin

will be approximately 2.5 times V_CCor 7.25V, whichever is

less.

GATE 1 (Pin 5): Gate Drive Output to an External High Side

Switch. Fully enhanced by internal charge pump. Con-

trolled by the SHDN 1 input pin. Output voltage on this pin

will be approximately 2.5 times V_CCor 7.25V, whichever is

less.

V_CC(Pin 6):InputSupplyVoltage.Rangefrom1.8Vto 5.5V.

BLOCK DIAGRA SM

LTC1981 Single High Side Switch Driver

15k

REGULATING

CHARGE PUMP

LTC1982 Dual High Side Switch Driver

GATE

SHDN

REGULATING

CHARGE

PUMP 1

30k

GATE 1

SHDN 1

GDR

–

REGULATING

CHARGE

PUMP 2

30k

–

GATE 2

SHDN 2

REF

1981/82 BD02

1981/82 BD01

OPERATIO

Charge Pump

the related gate drive output pin high. A logic low input on

one of the shutdown input pins disables the correspond-

ing charge pump and drives the related gate drive output

pin low. If shutdown input on the LTC1981 is low or both

of the shutdown input pins on the LTC1982 are low, the

part will be placed into a low current shutdown mode

(<1µA).

To fully enhance the external N-channel switches, internal

charge pumps are used to boost the output gate drive to

approximately 2.5 times the supply voltage, or 7.25V,

whichever is less. A feedback network is used to regulate

the output gate drive. This keeps the supply current low in

addition to providing a maximum output voltage limit. The

reason for the maximum output voltage limit is to avoid

switch gate source breakdown due to excessive gate

overdrive.

Gate Drive Ready (LTC1981 Only)

Thegatedrivereadypin(GDR)isusedtoindicatewhenthe

gate drive output (GATE) is greater than 90% of its final

value. This can be useful in applications that require

knowledge of the state of the gate drive for initialization

purposes or as fault detection should something be load-

ing the gate drive down.

The gate drive outputs (GATE 1, GATE 2, or GATE) are

controlled by the shutdown input pins (SHDN 1, SHDN 2

or SHDN). A logic high input on one of the shutdown input

pins enables the corresponding charge pump and drives

1 2 3 456 7 8

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