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Overview
| Topology | Other Topology |
| IC revision | B |
Description
The MCP1661 device is a compact, high-efficiency,fixed-frequency, non-synchronous step-up DC-DC converter which integrates a 36V, 800 m NMOS switch. It provides a space-efficient high-voltage step-up power supply solution for applications powered by either two-cell or three-cell alkaline, Ultimate Lithium,NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.
The integrated switch is protected by the 1.3A cycle-by-cycle inductor peak current limit operation. There is an output overvoltage protection which turns off switching in case the feedback resistors are accidentally disconnected or the feedback pin is short-circuited to GND.
Low-voltage technology allows the regulator to start-up without high inrush current or output voltage overshoot from a low-voltage input. The device features a UVLO which avoids start-up and operation with low inputs or discharged batteries for two cell-powered applications.
For standby applications (EN = GND), the device stops switching, enters Sleep mode and consumes 200 nA (typical) of input current.
MCP1661 is easy to use and allows creating classic boost, SEPIC or flyback DC-DC converters within a small Printed Circuit Board (PCB) area. Allcompensation and protection circuitry is integrated to minimize the number of external components. Ceramic input and output capacitors are used.
Features
- 36V, 800m Integrated Switch
- Up to 92% Efficiency
- High Output Voltage Range: up to 32V
- 1.3A Peak Input Current Limit:
- IOUT > 200 mA @ 5.0V VIN, 12V VOUT
- IOUT > 125 mA @ 3.3V VIN, 12V VOUT
- IOUT > 100 mA @ 4.2V VIN, 24V VOUT
- Input Voltage Range: 2.4V to 5.5V
- Undervoltage Lockout (UVLO):
- UVLO@VIN Rising: 2.3V, typical
- UVLO@VIN Falling: 1.85V, typical
- No Load Input Current: 250 μA, typical
- Sleep mode with 200 nA Typical Quiescent Current
- PWM Operation with Skip mode: 500 kHz
- Feedback Voltage Reference: VFB = 1.227V
- Cycle-by-Cycle Current Limiting
- Internal Compensation
- Inrush Current Limiting and Internal Soft Start
- Output Overvoltage Protection (OVP) in the event of:
- Feedback pin shorted to GND
- Disconnected feedback divider
- Overtemperature Protection
- Easily Configurable for SEPIC or Flyback Topologies
- Available Packages:
- 5-Lead SOT-23
- 8-Lead 2x3 TDFN
Typical applications
- Single-Cell Li-Ion to 5V, 12V or 24V Converters
- Hand-Held Instruments
- Two and Three-Cell Alkaline, Lithium Ultimate and NiMH/NiCd Portable Products
- Single-Cell Li-Ion to 3.0V or 3.3V SEPIC Applications
- Camera Phone Flash
- Portable Medical Equipment
- LCD Bias Supply for Portable Applications
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | IRP,40K(A) | ISAT(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(Ω) | fres(MHz) | Poles | L(mm) | Vaporphase process | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PD2 SMT Power Inductor, 12 µH, 1.28 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD2 SMT Power Inductor | Inductance12 µH | Rated Current1.28 A | Performance Rated Current1.55 A | Saturation Current1.62 A | Saturation Current @ 10%1.62 A | Saturation Current @ 30%1.85 A | DC Resistance0.21 Ω | Self Resonant Frequency32 MHz | – | Length4 mm | – | ||||
 | WS-DISV Small Compact SMT with Raised Actuator 2.54 mm, –, 0.025 A | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWS-DISV Small Compact SMT with Raised Actuator 2.54 mm | – | Rated Current0.025 A | – | – | – | – | – | – | Poles1 | Length3.48 mm | Vaporphase processnot specified |