MCP1640T-I-CHY Electronic IC Chips 0.65V Start-up Synchronous Boost Regulator

MCP1640/B/C/D

0.65V Start-up Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option

Features

• Up to 96% Typical Efficiency

• 800 mA Typical Peak Input Current Limit:

  - IOUT > 100 mA @ 1.2V VIN, 3.3V VOUT

  - IOUT > 350 mA @ 2.4V VIN, 3.3V VOUT

  - IOUT > 350 mA @ 3.3V VIN, 5.0V VOUT

• Low Start-up Voltage: 0.65V, typical 3.3V VOUT @ 1 mA

• Low Operating Input Voltage: 0.35V, typical 3.3VOUT @ 1 mA

• Adjustable Output Voltage Range: 2.0V to 5.5V

• Maximum Input Voltage ≦ VOUT < 5.5V

• Automatic PFM/PWM Operation (MCP1640/C):

  - PFM Operation Disabled (MCP1640B/D)

  - PWM Operation: 500 kHz

• Low Device Quiescent Current: 19 µA, typical PFM Mode

• Internal Synchronous Rectifier

• Internal Compensation

• Inrush Current Limiting and Internal Soft-Start

• Selectable, Logic Controlled, Shutdown States:

  - True Load Disconnect Option (MCP1640/B)

  - Input to Output Bypass Option (MCP1640C/D)

• Shutdown Current (All States): < 1 µA

• Low Noise, Anti-Ringing Control

• Overtemperature Protection

• Available Packages:

  - SOT23-6

  - 2x3 8-Lead DFN

Applications

• One, Two and Three Cell Alkaline and NiMH/NiCd Portable Products

• Single Cell Li-Ion to 5V Converters

• Li Coin Cell Powered Devices

• Personal Medical Products

• Wireless Sensors

• Handheld Instruments

• GPS Receivers

• Bluetooth Headsets

• +3.3V to +5.0V Distributed Power Supply

General Description

The MCP1640/B/C/D is a compact, high-efficiency, fixed frequency, synchronous step-up DC-DC converter. It provides an easy-to-use power supply solution for applications powered by either one-cell, two-cell, or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.

Low-voltage technology allows the regulator to start up without high inrush current or output voltage overshoot from a low 0.65V input. High efficiency is accomplished by integrating the low resistance N-Channel Boost switch and synchronous P-Channel switch. All compensation and protection circuitry are integrated to minimize external components. For standby applications, the MCP1640 operates and consumes only 19 µA while operating at no load and provides a true disconnect from input to output while shut down (EN = GND). Additional device options are available that operate in PWM only mode and connect input to output bypass while shut down.

A “true” load disconnect mode provides input to output isolation while disabled by removing the normal boost regulator diode path from input to output. A bypass mode option connects the input to the output using the integrated low resistance P-Channel MOSFET, which provides a low bias keep alive voltage for circuits operating in Deep Sleep mode. Both options consume less than 1 µA of input current.

Output voltage is set by a small external resistor divider. Two package options, SOT23-6 and 2x3 DFN-8, are available.

Package Types

Absolute Maximum Ratings †

EN, FB, V_IN, V_SW, V_OUT - GND...........................+6.5V

EN, FB ........... ＜greater of V_OUT or V_IN＞(GND - 0.3V)

Output Short Circuit Current....................... Continuous

Output Current Bypass Mode...........................400 mA

Power Dissipation ............................ Internally Limited

Storage Temperature ......................... -65℃ to +150℃

Ambient Temp. with Power Applied ...... -40℃ to +85℃

Operating Junction Temperature........ -40℃ to +125℃

ESD Protection On All Pins:

      HBM ........................................................ 3 kV

      MM ........................................................300 V

† Notice: Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability.

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