Description
The LTC1624 is a current mode switching regulator controller that drives an external N-channel power MOSFET using a fixed frequency architecture. It can be operated in all standard switching configurations including boost, step-down, inverting and SEPIC. Burst Mode operation provides high efficiency at low load currents. A maximum high duty cycle limit of 95% provides low dropout operation which extends operating time in battery-operated systems.
The operating frequency is internally set to 200kHz, allowing small inductor values and minimizing PC board space. The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 36V (absolute maximum).
A multifunction pin (ITH/RUN) allows external compensation for optimum load step response plus shutdown. Soft start can also be implemented with the ITH/RUN pin to properly sequence supplies.
Features
- N-Channel MOSFET Drive
- Implements Boost, Step-Down, SEPIC and Inverting Regulators
- Wide VIN Range: 3.5V to 36V Operation
- Wide VOUT Range: 1.19V to 30V in Step-Down Configuration
- ±1% 1.19V Reference
- Low Dropout Operation: 95% Duty Cycle
- 200kHz Fixed Frequency
- Low Standby Current
- Very High Efficiency
- Remote Output Voltage Sense
- Logic-Controlled Micropower Shutdown
- Internal Diode for Bootstrapped Gate Drive
- Current Mode Operation for Excellent Line and Load Transient Response
- Available in an 8-Lead SO Package
Package Variations
| Part Number | Package | Pins | Temp |
| LTC1624CS8 | SO | 8 | C |
| LTC1624CS8#PBF | SO | 8 | C |
| LTC1624CS8#TR | SO | 8 | C |
| LTC1624CS8#TRPBF | SO | 8 | C |
| LTC1624IS8 | SO | 8 | I |
| LTC1624IS8#PBF | SO | 8 | I |
| LTC1624IS8#TR | SO | 8 | I |
| LTC1624IS8#TRPBF | SO | 8 | I |
Applications
- Notebook and Palmtop Computers, PDAs
- Cellular Telephones and Wireless Modems
- Battery-Operated Digital Devices
- DC Power Distribution Systems
- Battery Chargers
Typical Application
