Microchip MCP1661 Bedienungsanleitung

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 2014-2015 Microchip Technology Inc.DS20005315B-page 1

MCP1661

Features

•36V, 800m Integrated Switch

•Up to 92% Efficiency

•High Output Voltage Range: up to 32V

•1.3A Peak Input Current Limit:

- IOUT > 200mA@ 5.0V VIN, 12V VOUT

- IOUT > 125mA@ 3.3V VIN, 12V VOUT

- IOUT > 100mA@ 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: 500kHz

•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

Applications

•Two and Three-Cell Alkaline, Lithium Ultimate and

NiMH/NiCd Portable Products

•Single-Cell Li-Ion to 5V, 12V or 24V Converters

•LCD Bias Supply for Portable Applications

•Camera Phone Flash

•Portable Medical Equipment

•Hand-Held Instruments

•Single-Cell Li-Ion to 3.0V or 3.3V SEPIC

Applications (see Figure 6-3)

General 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. All

compensation and protection circuitry is integrated to

minimize the number of external components. Ceramic

input and output capacitors are used.

Package Types

* Includes Exposed Thermal Pad (EP); see Table 3-1.

SW

EN

VIN

GND

MCP1661

SOT-23

VFB

MCP1661

2x3 TDFN*

1

2

3

5

4

SW

SGND

NC

PGND

NC

1

2

3

4

8

7

6

5 VIN

ENVFB

EP

9

High-Voltage Integrated Switch PWM Boost Regulator with UVLO

Produktspezifikationen