MCP1256 datasheet(1/24 Pages) MICROCHIP

部件名	MCP1256

功能描述	Regulated 3.3V, Low-Ripple Charge Pump with Low- Operating Current SLEEP Mode or BYPASS Mode

PDF	24 Pages

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

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1 / 24 page

DS21989A-page 1

MCP1256/7/8/9

Features

• Inductorless 1.5x, 2x Boost DC/DC Converter

• Output Voltage: 3.3V

• High Output Voltage Accuracy:

- ±3.0% (VOUT Fixed)

• Output Current Up To 100 mA

•20 mV

PP Output Voltage Ripple

• Thermal Shutdown and Short Circuit Protection

• Uses Small Ceramic Capacitors

• Switching Frequency: 650 kHz

• Low-Power SLEEP Mode: MCP1256/7

• BYPASS Mode: MCP1258/9

• Low-Power Shutdown Mode: 0.1 μA (Typical)

• Shutdown Input Compatible with 1.8V Logic

•VIN Range: 1.8V to 3.6V

• Soft-Start Circuitry to Minimize Inrush Current

• Temperature Range: -40°C to +125°C

• Packaging:

- 10-Pin, 3 mm x 3 mm DFN

-10-Pin, MSOP

Applications

• Pagers

• Portable Measurement Instruments

• Home Automation Products

•PICmicro® MCU Bias

Typical Application

Description

The MCP1256, MCP1257, MCP1258 and MCP1259

are inductorless, positive regulated charge pump

DC/DC converters. The devices generate a regulated

3.3V output voltage from a 1.8V to 3.6V input. The

devices are specifically designed for applications

operating from 2-cell alkaline, Ni-Cd, or Ni-MH

batteries or by one primary lithium MnO2 (or similar)

coin cell battery.

The MCP1256, MCP1257, MCP1258 and MCP1259

provide high efficiency by automatically switching

between 1.5x and 2x boost operation. In addition, at

light output loads, the MCP1256 and MCP1257 can be

placed in a SLEEP mode, lowering the quiescent

current while maintaining the regulated output voltage.

Alternatively, the MCP1258 and MCP1259 provide a

BYPASS feature connecting the input voltage to the

output.

This

allows

for

real-time

clocks,

microcontrollers or other system devices to remain

biased with virtually no current being consumed by the

MCP1258 or MPC1259.

In normal operation, the output voltage ripple is below

20 mV

PP at load currents up to 100 mA. Normal opera-

tion occurs at a fixed switching frequency of 650 kHz,

avoiding interference with sensitive IF bands.

The MCP1256 and MCP1258 feature a power-good

output that can be used to detect out-of-regulation

conditions. The MCP1257 and MCP1259 feature a low-

battery indication that issues a warning if the input

voltage drops below a preset voltage threshold.

Extremely low supply current and few external parts (4

capacitors) make these devices ideal for small, battery-

powered applications. A Shutdown mode is also

provided for further power reduction.

The devices incorporate thermal and short-circuit pro-

tection. Two package offerings are provided: 10-pin

MSOP and 10-lead 3 mm x 3 mm DFN. The devices

are completely characterized over the junction temper-

ature range of -40°C to +125°C.

PGOOD

GND

SHDN

1

2

3

4

MCP1256

VOUT 5

6

7

8

9

10

VIN

SLEEP

CIN

10 μF

COUT

10 μF

C1-

C1+

C1

1 μF

C2-

C2+

C2

1 μF

R1

INPUT

1.8V to 3.6V

OUTPUT

3.3V

Power-Good

Indication

ON / OFF

Typical Application with Power-Good Indication

Regulated 3.3V, Low-Ripple Charge Pump with Low-

Operating Current SLEEP Mode or BYPASS Mode

类似零件编号 - MCP1256

制造商	部件名	数据表	功能描述
Microchip Technology	MCP1256	696Kb / 24P	Regulated 3.3V, Low-Ripple Charge Pump with Low- Operating Current SLEEP Mode or BYPASS Mode 2006-2013

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