LINEAR TECHNOLOGY LTC1155 User's Manual
Summary
LTC1155 is a dual high-side micropower MOSFET driver enabling N-channel FETs for high-side switching. Features internal charge pump, 8uA standby, 85uA operating current, 4.5-18V supply, overcurrent protection, and short-circuit shutdown. In 8-pin PDIP/SO, it targets laptop, cellular phone, and battery-powered system designers needing efficient power switching.
Page 1 Text Content
LTC1155
Dual High Side
Micropower MOSFET Driver SFEATURE ESCRIPTIO
Fully Enhances N-Channel Power MOSFETs The LTC®1155 dual high side gate driver allows using low 8µA Standby Current cost N-channel FETs for high side switching applications. 85µA ON Current An internal charge pump boosts the gate above the posi- Short-Circuit Protection tive rail, fully enhancing an N-channel MOSFET with no Wide Power Supply Range: 4.5V to 18V external components. Micropower operation, with 8µA
Controlled Switching ON and OFF Times standby current and 85µA operating current, allows use in
No External Charge Pump Components virtually all systems with maximum efficiency. Replaces P-Channel High Side MOSFETs
Included on-chip is overcurrent sensing to provide auto-
Compatible with Standard Logic Families
matic shutdown in case of short circuits. A time delay can
Available in 8-Pin SO Package
be added in series with the current sense to prevent false triggering on high in-rush loads such as capacitors and PPLICATI SA incandescent lamps. Laptop Power Bus Switching The LTC1155 operates off of a 4.5V to 18V supply input SCSI Termination Power Switching and safely drives the gates of virtually all FETs. The Cellular Phone Power Management LTC1155 is well suited for low voltage (battery-powered) P-Channel Switch Replacement applications, particularly where micropower “sleep” op-
Relay and Solenoid Drivers VO LT AG DR OP (V eration is required. Low Frequency Half H-Bridge
The LTC1155 is available in both 8-pin PDIP and 8-pin SO
Motor Speed and Torque Control
packages. , LTC and LT are registered trademarks of Linear Technology Corporation.
PPLICATITYPICAL Laptop Computer Power Bus Switch with Short Circuit Protection VS = 4.5V TO 5.5V
Switch Voltage Drop
RSEN CDLY CDLY RSEN
RDLY RDLY 100k 100k
DS2VSDS1 0.20
*IRLR034 *IRLR034
G1 LTC1155 G2
5A 5A 0.15 MAX MAX
GNDIN1 IN2 TTL, CMOS INPUTTTL, CMOS INPUT
POWER BUS
DISK PRINTER,
DISPLAY 0.00
SYSTEM
DRIVE ETC.
OUTPUT CURRENT (A)
1155 TA02
1155 TA01
*SURFACE MOUNT
Page Summary Contents For LINEAR TECHNOLOGY LTC1155 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 16 |
| File Size | 268.64 KB |
| Published | June 15, 2026 |
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Frequently Asked Questions
What is the supply voltage range of the LTC1155?
The LTC1155 operates from a 4.5V to 18V supply input.
Does the LTC1155 require external charge pump components?
No, it has an internal charge pump and needs no external charge pump components.
What protection does the LTC1155 offer for short circuits?
It has on-chip overcurrent sensing to provide automatic shutdown in case of short circuits.
What packages is the LTC1155 available in?
It is available in 8-pin PDIP and 8-pin SO packages.