CM2843 datasheet, PDF - EEWORLD Datasheet

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CM2843: Description300MA CMOS LDO WITH EN PG; File Size225KB，11 Pages; ManufacturerETC

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300MA CMOS LDO WITH EN PG

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CM2843

300mA CMOS LDO W

ITH

EN & PG

GENERAL DESCRIPTION

The CM2843 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-23-5 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 CM2843 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 up to 7.0V

Thermal Shutdown

Current Limiting

Power Good Output Function

Compact Package: SOT-23-5

Factory Pre-set Output Voltages

Short Circuit Current Fold-Back

Low Temperature Coefficient

APPLICATIONS

Battery-powered devices

Personal communication devices

Home electric/electronic appliances

PC peripherals

TYPICAL APPLICATIONS

1M Ω

CM 2843

GND

OUT

O UT

1uF

* For programming

delay

4.7uF

2004/06/01

Rev. 1.3

Champion Microelectronic Corporation

Page 1

CM2843

300mA CMOS LDO W

ITH

EN & PG

DETAILED DESCRIPTION

The CM2843 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 CM2843 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents

over-stress. The CM2843 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 CM2843 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

The Enable pin normally floats high. 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 CM2843 includes the Power Good feature. Normally, Pin 4 is “Floating”, however, when the output is less than 15% of the

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

Input Voltage too low

During Over-Temperature

During Over-Current

2004/06/01

Rev. 1.3

Champion Microelectronic Corporation

Page 5

CM2843 Related Products

	CM2843	CM2843ABIM25	CM2843ACIM25	CM2843AIM25	CM2843GABIM25	CM2843GACIM25	CM2843GAIM25
Description	300MA CMOS LDO WITH EN PG	300MA CMOS LDO WITH EN PG	300MA CMOS LDO WITH EN PG	300MA CMOS LDO WITH EN PG	300MA CMOS LDO WITH EN PG	300MA CMOS LDO WITH EN PG	300MA CMOS LDO WITH EN PG

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