CM2855IM26 datasheet, PDF - EEWORLD Datasheet

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CM2855IM26: DescriptionRegulator, 1 Output, CMOS, PDSO6,; CategoryPower/power management The power supply circuit; File Size230KB，10 Pages; ManufacturerChampion Microelectronic Corp.; Power control management IC chips are the primary key to improving the power saving performance of electronic facilities and products. Backed by the most advanced technology in Silicon Valley, U.S., Hongguan Electronics has invested in AC-DC analog power IC professional design for many years, and has always adhered to the concept of implementing energy conservation and carbon reduction, striving for a green world, so that energy saving and power saving performance can be fully realized in people's lives around the world.

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CM2855IM26 Overview

Regulator, 1 Output, CMOS, PDSO6,

CM2855IM26 Parametric

Parameter Name	Attribute value
Maker	Champion Microelectronic Corp.
package instruction	TSOP, TSOP6,.11,37
Reach Compliance Code	unknown
Adjustability	ADJUSTABLE
Nominal dropback voltage 1	1.3 V
JESD-30 code	R-PDSO-G6
Output times	1
Number of terminals	6
Working temperatureTJ-Max	125 °C
Working temperature TJ-Min	-40 °C
Maximum output current 1	0.3 A
Maximum output voltage 1	7 V
Minimum output voltage 1	1.2 V
Package body material	PLASTIC/EPOXY
encapsulated code	TSOP
Encapsulate equivalent code	TSOP6,.11,37
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, THIN PROFILE
Certification status	Not Qualified
surface mount	YES
technology	CMOS
Terminal form	GULL WING
Terminal pitch	0.95 mm
Terminal location	DUAL

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CM2855

300mA CMOS LDO W

ITH

EN & PG

GENERAL DESCRIPTION

The CM2855 family is positive, linear regulators featured low

quiescent current (30µA typ.) with low dropout voltage,

making them ideal for battery applications. The space-saving

SOT-23-6 package is attractive for “Pocket” and “Hard Held”

applications.

These rugged devices have both Thermal Shutdown, and

Current Fold-back to prevent device failure under the “Worst”

of operating conditions.

An additional feature is a “Power Good” detector, which pulls

low when the output is out of regulation.

The CM2855 is stable with an output capacitance of 2.2µF or

greater.

FEATURES

Very Low Dropout Voltage

Low Current Consumption: Typ. 30µA, Max. 35µA

High Accuracy Output Voltage: +/- 2.5%

Guaranteed 300mA Output

Input Range of 2.6V to 7.0V

Thermal Shutdown

Current Limiting

Power Good Output Function

Compact Package: SOT-23-6

Adjustable Output Voltages

Short Circuit Current Fold-Back

Low Temperature Coefficient

APPLICATIONS

Battery-powered devices

Personal communication devices

Home electric/electronic appliances

PC peripherals

24 Hours Technical Support--WebSIM

Champion provides customers an online circuit simulation tool

called WebSIM. You could simply logon our website at

www.champion-micro.com for details.

TYPICAL APPLICATIONS

OUT

CM 2855

GND

ADJ

OUT

1uF

2 .2 u F

Note:

1. Suggest to add a small Cap 100pF between OUT and connection of R1and R2 to get less VOUT ripple

Vout = Vref * (1 + R1/R2); Vref = 1.176V

2. Enable pin can not be floating.

2003/12/05

Rev. 1.1

Champion Microelectronic Corporation

Page 1

CM2855

300mA CMOS LDO W

ITH

EN & PG

DETAILED DESCRIPTION

The CM2855 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current

protection, output short circuit protection, thermal shutdown, and power good function.

The P-channel pass transistor receives data from the error amplifier, over-current shutdown, short output protection, and thermal

protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current

and Thermal shutdown circuits become active when the junction temperature exceeds 150℃, or the current exceeds 300mA.

During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops

below 120℃.

The CM2855 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents

over-stress. The CM2855 also incorporates current fold-back to reduce power dissipation when the output is short-circuited. This

feature becomes active when the output drops below 0.95V, and reduces the current flow by 65%. Full current is restored when

the voltage exceeds 0.95V.

EXTERNAL CAPACITOR

The CM2855 is stable with an output capacitor to ground of 2.2µF or greater. It can keep stable even with higher or poor ESR

capacitors. A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should be

larger than 0.1µF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A “quiet” ground

termination is desirable.

ENABLE

When actively, pulled low, the PMOS pass transistor shut off, and all internal circuits are powered down. In this state, the

quiescent current is less than 1µA. This pin behaves much like an electronic switch.

POWER GOOD

The CM2855 includes the Power Good feature. Normally, Pin 4 is floating, however, when the output is lower than 85% of the

specified voltage, it pulls low. This can occur under the following conditions:

Input Voltage too low

During Over-Temperature

During Over-Current

2003/12/05

Rev. 1.1

Champion Microelectronic Corporation

Page 5

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