LTC1982 Linear Technology, LTC1982 Datasheet

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LTC1982

Manufacturer Part Number
LTC1982
Description
(LTC1981 / LTC1982) Single and Dual Micropower High Side Switch Controllers
Manufacturer
Linear Technology
Datasheet

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FEATURES
TYPICAL APPLICATIONS
APPLICATIO S
www.DataSheet4U.com
No External Components Required
Internal Voltage Triplers Produce High Side
Gate Drive for Logic Level FETs
Ultralow Power:
V
Gate Drive Outputs Driven to Ground During
Shutdown
Gate Drive Outputs Internally Clamped to 7.5V Max
“Gate Drive Ready” Output (LTC1981)
Ultrasmall Application Circuit
5-Pin SOT-23 Package (LTC1981)
6-Pin SOT-23 Package (LTC1982)
Cellular Telephones
Portable POS Terminal
Handheld Battery Powered Equipment
CC
1.8V TO 5.0V
10 A Per Driver ON Current (LTC1982)
20 A ON Current (LTC1981)
<1 A Shutdown Current
Range: 1.8V to 5V
READY
DRIVE
SHDN
GATE
10 F
V
CC
Single High Side Switch Controller
+
100k
U
GDR
V
CC
5
1
LTC1981
GND
2
U
SHDN
GATE
4
3
LOAD
1981/82 TA01
Q1
Si3442DV
Single and Dual Micropower
High Side Switch Controllers
1.8V TO 5.0V
DESCRIPTIO
The LTC
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 10 A per driver (20 A for LTC1981)
once the gates are charged.
Low quiescent current and low shutdown current (under
1 A) 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.
SHDN 1
SHDN 2
10 F
V
CC
+
®
1981/LTC1982 are low-power, self-contained
SHDN 1
Dual High Side Switch Controller
V
CC
6
1
U
LTC1982
LTC1981/LTC1982
GATE 1 GATE 2
GND
5
2
SHDN 2
4
3
LOAD 1
in SOT-23
Q1
1/2 Si6925DQ
LOAD 2
Q2
1/2 Si6925DQ
1981/82 TA02
1

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LTC1982 Summary of contents

Page 1

... 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. ...

Page 2

... IH C SHDN Input Capacitance IN I SHDN Input Leakage Current (Notes 1, 2) Operating Temperature Range LTC1981E/LTC1982E (Note 3) ............ – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 ORDER PART NUMBER TOP VIEW SHDN 1 1 LTC1981ES5 GND 2 ...

Page 3

... GATE Voltage Falling After GATE is Above the GDR Trip Threshold 10k Pull- Note 3: the LTC1982E is guaranteed to meet performance specifications from Specifications over the – operating temperature range are assured by design, characterization and correlation with statistical process controls. ...

Page 4

... GATE output pin to ground. GATE (Pin 4): Gate Drive Output to an External High Side Switch. Fully enhanced by internal charge pump. Con- trolled by the SHDN input pin. Output voltage on this pin will be approximately 2.5 times V CC less. 4 Turn-Off Time (LTC1982 1000pF GATE ...

Page 5

... 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 (<1 A). ...

Page 6

... The start up current can be substantially reduced by limiting the slew rate at the gate of an N-channel as shown in Figure 1. The gate drive output of the LTC1981/LTC1982 have an internal 30k resistor (15k LTC1981) in series with each of the output gate drive pins (see Functional Block Diagram) ...

Page 7

... APPLICATIONS www.DataSheet4U.com INFORMATION Reverse Battery Protection The LTC1981/LTC1982 can be protected against reverse battery conditions by connecting a 150 resistor in series with the supply pin as shown in Figure 4. The resistor limits the supply current to less than 24mA with –3.6V applied. Because the LTC1981/LTC1982 draw very little current while in normal operation, the drop across the resistor is minimal ...

Page 8

... FAX: (408) 434-0507 www.linear-tech.com Driving Both High Side and Low Side Switches EXT 1.8 to 5.0V (30V MAX LOW SIDE LOAD SHDN 1 CC LTC1982 GND GATE 1 0 SHDN 2 GATE 2 1k 0.1 F COMMENTS Circuit Breaker with Auto Reset Latchoff Current Limit ...

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