LTC1871EMS#PBF
Power Management
Technical Specifications
| Type | Description |
|---|---|
| Synchronous Rectifier | No |
| Switch Tube (built-in/external) | External |
| Operating Temperature | -40°C~+85°C@(TA) |
| Features | Frequency synchronization;Built-in LDO regulator;Light load efficient mode |
| Output Current | - |
| Channels | 1 |
| Topology | Boost;SEPIC;Flyback |
| Type | Description |
|---|---|
| Switching Freq Hz | 1 MHz |
| Supply Voltage | 2.5V~36V |
| Output Type | Adjustable |
| Output Voltage | - |
| Function | Boost |
| Quiescent Current | 250 µA |
| Package / Case | MSOP-10 |
Product Introduction
The LTC1871 is a wide input range, current mode, boost, flyback or SEPIC controller that drives an N-channel power MOSFET and requires very few external components. Intended for low to medium power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maximizing efficiency.
The IC’s operating frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 2.5V and a low shutdown quiescent current of 10μA make the LTC1871 ideally suited for battery-operated systems.
For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/SYNC pin. Higher output voltage boost, SEPIC and flyback applications are possible with the LTC1871 by connecting the SENSE pin to a resistor in the source of the power MOSFET.
The LTC1871 is available in the 10-lead MSOP package.
Features
- High Efficiency (No Sense Resistor Required)
- Wide Input Voltage Range: 2.5V to 36V
- Current Mode Control Provides Excellent Transient Response
- High Maximum Duty Cycle (92% Typ)
- ±2% RUN Pin Threshold with 100mV Hysteresis
- ±1% Internal Voltage Reference
- Micropower Shutdown: IQ = 10μA
- Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor
- Synchronizable to an External Clock Up to 1.3×fOSC
- User-Controlled Pulse Skip or Burst Mode Operation
- Internal 5.2V Low Dropout Voltage Regulator
- Output Overvoltage Protection
- Capable of Operating with a Sense Resistor for High Output Voltage Applications
- Small 10-Lead MSOP Package
Applications
- Telecom Power Supplies
- Portable Electronic Equipment
Datasheet
Alternative Parts
Common LTC1871EMS#PBF alternatives overseas buyers search for:
Compliance & Export Codes
| Type | Details |
|---|---|
| RoHS | ROHS3 |
| ECCN | EAR99 |
| CNHTS | 8542399000 |
| USHTS | 8542390001 |
| TARIC | 8542399000 |
| Type | Details |
|---|---|
| CAHTS | 8542390000 |
| BRHTS | 85423999 |
| INHTS | 85423900 |
| MXHTS | 8542.39.99 |
Sourcing Information
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