LTC1871-1
PRODUCTIONWide Input Range, No RSENSE™ Current Mode Boost, Flyback and SEPIC Controller
- Part Models
- 4
- 1ku List Price
- Starting From $4.04
Overview
- 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
- Ultra Low Pulse Skip Threshold for Wide Input Range Applications
- 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
The LTC1871-1 is a wide input range, current mode, boost, flyback or SEPIC controller that drives an Nchannel power MOSFET and requires very few external components. It eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maximizing efficiency. Higher output voltage applications are possible with the LTC1871-1 by connecting the SENSE pin to a resistor in the source of the power MOSFET.
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.
The LTC1871-1 differs from the LTC1871 by having a lower pulse skip threshold, making it ideal for applications requiring constant frequency operation at light loads. The lower pulse skip threshold also helps maintain constant frequency operation in applications with a wide input voltage range. For applications requiring primary-to-secondary side isolation, please refer to the LTC1871 datasheet.
The LTC1871-1 is available in the 10-lead MSOP package.
| Vin Range | INTVcc | Features | |
| LTC1871 | 2.5V to 36V | 5.2V | - |
| LTC1871-1 | 2.5V to 36V | 5.2V | Lower Burst Mode Threshold (0.195V vs. 0.3V) |
| LTC1871-7 | 6V to 36V | 7V | Drives 6V Gate N-Channel MOSFETs |
| LTC1871X | 2.5V to 36V | 5.2V | 175°C Junction Temp, 100% Tested at 175°C |
Applications
- Telecom Power Supplies
- Portable Electronic Equipment
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC1871EMS-1#PBF | 10-Lead MSOP | ||
| LTC1871EMS-1#TRPBF | 10-Lead MSOP | ||
| LTC1871IMS-1#PBF | 10-Lead MSOP | ||
| LTC1871IMS-1#TRPBF | 10-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 5, 2024 - 24_0004 Epoxy Change from Henkel 8290 to 8290A for MSOP (3) |
||
| LTC1871EMS-1#PBF | PRODUCTION | |
| LTC1871EMS-1#TRPBF | PRODUCTION | |
| LTC1871IMS-1#PBF | PRODUCTION | |
| LTC1871IMS-1#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC1871EMS-1#PBF | PRODUCTION | |
| LTC1871EMS-1#TRPBF | PRODUCTION | |
| LTC1871IMS-1#PBF | PRODUCTION | |
| LTC1871IMS-1#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC1871
- LTC1871-1
- LTC1871-7
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
LTC1871EMS-1 Demo Board | SEPIC Controller; 5V to 20 VIN, 12 VOUT @ 3A
Resources
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