LTC1981_15 Datasheet, PDF (1/8 Pages) Linear Technology – Single and Dual Micropower High Side Switch Controllers in SOT-23

LTC1981/LTC1982
Single and Dual Micropower
High Side Switch Controllers
in SOT-23
FEATURES
s _{No External Components Required}
s _{Internal Voltage Triplers Produce High Side}
Gate Drive for Logic Level FETs
s _{Ultralow Power:}
10µA Per Driver ON Current (LTC1982)
20µA ON Current (LTC1981)
<1µA Shutdown Current
s _{VCC Range: 1.8V to 5V}
s _{Gate Drive Outputs Driven to Ground During}
Shutdown
s _{Gate Drive Outputs Internally Clamped to 7.5V Max}
s _{“Gate Drive Ready” Output (LTC1981)}
s _{Ultrasmall Application Circuit}
s _{5-Pin SOT-23 Package (LTC1981)}
s _{6-Pin SOT-23 Package (LTC1982)}
U
APPLICATIO S
s _{Cellular Telephones}
s _{Portable POS Terminal}
s _{Handheld Battery Powered Equipment}
DESCRIPTIO
The LTC^®1981/LTC1982 are low-power, self-contained
N-channel MOSFET drivers. An internal voltage tripler
allows gates to be driven without the use of any external
components. Internal regulation circuitry allows quies-
cent current to drop to 10µA per driver (20µA for LTC1981)
once the gates are charged.
Low quiescent current and low shutdown current (under
1µA) make these parts ideal for battery and other power
constrained systems. The wide input voltage range ac-
commodates a variety of battery/input configurations.
Gate drive is internally clamped to 7.5V providing protec-
tion to the external MOSFET gate. The MOSFETs can be
driven in either high side or low side mode.
The LTC1981 single driver version also includes a gate
drive ready pin and twice the drive current capacity of the
dual driver LTC1982.
The LTC1981 is available in a 5-pin SOT-23. The LTC1982
is available in a 6-pin SOT-23.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIONS
Single High Side Switch Controller
V_CC
1.8V TO 5.0V
+
10µF
Q1
Si3442DV
100k
GATE
DRIVE
READY
SHDN
5
4
V_CC
GATE
LTC1981
GDR GND SHDN
1
2
3
LOAD
1981/82 TA01
V_CC
1.8V TO 5.0V
+
10µF
SHDN 1
SHDN 2
Dual High Side Switch Controller
6
5
4
V_CC GATE 1 GATE 2
LTC1982
SHDN 1 GND SHDN 2
1
2
3
Q1
1/2 Si6925DQ
Q2
1/2 Si6925DQ
LOAD 1
LOAD 2
1981/82 TA02
1