DocumentationDatasheet
Application Note
- AN51 - Power Conditioning for Notebook and Palmtop Systems
- AN53 - Micropower High Side MOSFET Drivers
- AN66 - Linear Technology Magazine Circuit Collection, Volume II
Design Note
Reliability Data
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Features
- Fully Enhances N-Channel Power MOSFETs
- 8μA Standby Current
- 85μA ON Current
- Short-Circuit Protection
- Wide Power Supply Range: 4.5V to 18V
- Controlled Switching ON and OFF Times
- No External Charge Pump Components
- Replaces P-Channel High Side MOSFETs
- Compatible with Standard Logic Families
- Available in 8-Pin SO Package
Typical Application
Description
The LTC®1155 dual high side gate driver allows using low cost N-channel FETs for high side switching applications. An internal charge pump boosts the gate above the positive rail, fully enhancing an N-channel MOSFET with no external components. Micropower operation, with 8μA standby current and 85μA operating current, allows use in virtually all systems with maximum efficiency.
Included on-chip is overcurrent sensing to provide automatic shutdown in case of short circuits. A time delay can be added in series with the current sense to prevent false triggering on high in-rush loads such as capacitors and incandescent lamps.
The LTC1155 operates off of a 4.5V to 18V supply input and safely drives the gates of virtually all FETs. The LTC1155 is well suited for low voltage (battery-powered) applications, particularly where micropower “sleep” operation is required.
The LTC1155 is available in both 8-pin PDIP and 8-pin SO packages.
N-8,SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC1155CN8#PBF | PDIP | 8 | C | $3.50 | $2.90 |
| LTC1155CS8#PBF | SO | 8 | C | $3.75 | $3.10 |
| LTC1155CS8#TRPBF | SO | 8 | C | $3.16 | |
| LTC1155IN8#PBF | PDIP | 8 | I | $4.60 | $3.70 |
| LTC1155IS8#PBF | SO | 8 | I | $4.90 | $4.00 |
| LTC1155IS8#TRPBF | SO | 8 | I | $4.06 | |
| LTC1155CN8 | PDIP | 8 | C | $7.00 | $5.80 |
| LTC1155CS8 | SO | 8 | C | $7.50 | $6.20 |
| LTC1155CS8#TR | SO | 8 | C | $6.32 | |
| LTC1155IN8 | PDIP | 8 | I | $9.20 | $7.40 |
| LTC1155IS8 | SO | 8 | I | $9.80 | $8.00 |
| LTC1155IS8#TR | SO | 8 | I | $8.12 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.