California Micro Devices CMPWR300 Datasheet

CALIFORNIA MICRO DEVICES

CMPWR300

500mA SmartORTM DUAL REGULATOR WITH V

Features

 8-pin Power SOIC package

 Continuous 3.3V output from three inputs

 Complete Power Management solution

V

, V

Regulator supplies 500mA output

CC

SBY

 Built-in hysteresis when selecting input supplies

 Integrated switch has very low R

0.12Ω (typ.)

DS(ON)

 Large Bypass Capacitors on inputs not required

Applications

 PCI adapter cards with Wake-On-LAN

 Network Interface Cards (NICs)

 Multiple Power Systems

 Systems with Standby Capabilities

Product Description

The CMPWR300 is a dual input regulator with V

switch ca-

AUX

pable of delivering 3.3V/500mA continuously. The output power

is provided from three independent input voltage sources on a

prioritized basis. Power is always taken in priority using the fol-

, V

lowing order V

, and V

CC

SBY

AUX

.

Pin Diagram

Typical Application Circuit

SWITCH

AUX

When V

ables the regulator and produces a stable 3.3V output at V

When only V

impedance direct connection (0.12Ω typ.) from V

(5V) or V

CC

is present, the device automatically en-

SBY

(3.3V) is present, the device provides a low

AUX

AUX

to V

OUT

OUT

All the necessary control circuitry needed to provide a smooth

and automatic transition between all three supplies has been

incorporated. This allows both V

and V

CC

to be dynamically

SBY

switched without loss of output voltage.

TS

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Simplified Electrical Schematic

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When placing an order please specify desired shipping: Tubes or Tape & Reel.

© 2000 Calirornia Micro Devices Corp. All rights reserved.

12/5/2000

215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

CMPWR300 is a trademark of California Micro Devices Corp.

C0621199

1

CALIFORNIA MICRO DEVICES

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Note 2: The hysteresis defines the maximum level of acceptable disturbance on

Note 3: Ground current consists of controller current and regulator current if enabled.

©2000 California Micro Devices Corp. All rights reserved.

2

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215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

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12/5/2000

CALIFORNIA MICRO DEVICES

Interface Signals

V

is the primary power source which is given priority when

CC

present. If this connection is made within a few inches of

the main input filter, a bypass capacitor may not be necessary.

Otherwise a bypass filter capacitor in the range of 1µF to
10µF will ensure adequate filtering.

The voltage level on VCC is compared to an internal threshold

voltage to determine which power source is to be selected.

In order to prevent regulator dropout from occurring, the

threshold has been programmed to ensure VCC is deselected

prior to dropout, which prevents loss of output regulation

when switching between V

is set to 4.2V. Once V

voltage is immediately derived from the auxiliary power

source. To prevent chatter during this transition, the threshold

has a built-in hysteresis of 300mV which results in only V

being selected once the voltage level exceeds 4.50V

(typically).

V

is the standby 5V supply power source, which is given

SBY

priority when V

is not present. The internal regulator will

CC

remain enabled until such time that V

disable threshold level (4.2V typically). If the V

is made within a few inches of the main input filter, a bypass

capacitor may not be necessary. Otherwise a bypass filter

capacitor in the range of 1µF to 10µF will ensure adequate

filtering.

and V

CC

falls below this level, the output

CC

. Typically the threshold

SBY

falls below the

SBY

connection

SBY

CMPWR300

is the auxiliary low voltage power source. This supply

V

AUX

is only used when neither the V

these conditions an internal switch is enabled and provides

a very low impedance connection directly between V

and V

V

.

AUX

is the output voltage. Power is provided from the

OUT

regulator or via the low impedance auxiliary switch. This

output requires a capacitance of 10µF to ensure regulator

stability and minimize the peak output disturbance during

power supply changeover.

GND provides the reference for all voltages.

CC

nor V

CC

is available. Under

SBY

OUT

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© 2000 Calirornia Micro Devices Corp. All rights reserved.

12/5/2000

215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

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3

CALIFORNIA MICRO DEVICES

CMPWR300

Typical DC Characteristics

Unless stated otherwise, all DC characteristics were measured at room temperature with a nominal VCC supply voltage of 5.0

volts and an output capacitance of 10µF.

Fig 1.1.

Line regulation of the regulator is shown here. At maximum

rated load conditions (500mA), a 100mV drop in regulation

occurs when the line voltage falls below 3.8V. For light load

conditions (100mA), regulation is maintained for line voltages

as low as 3.5V.

In normal operation the regulator is deselected at 4.2V, which

ensures a regulation output drop of less than 100mV is

maintained.

Fig 1.2.

Load regulation (pulse condition) performance is shown up

to and beyond the rated load. A change in load from 10%

to 100% of rated (50mA to 500mA) results in an output

voltage change of about 20mV. This translates into an

effective output impedance of less than 50mΩ.

3.35

100mA load

500mA load

3.0 3.5 4.0 4.5 5.0

Vout [V]

3.30

3.25

3.20

3.15

3.10

3.05

Vcc [V]

Fig 1.2. Load Regulation (pulse condition)

3.36

3.34

3.32

3.30

Fig 1.1. Line Regulation

Fig 1.3.

V

Switch Resistance is shown across a broad range of

AUX

supply level. From 2.7V and 3.6V, it only varies from

V

AUX

about 130mΩ down to 110mΩ.

©2000 California Micro Devices Corp. All rights reserved.

4

215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

3.28

Vout [V]

3.26

3.24
0 200 400 600 800

Load Current [mA]

Fig 1.3. Va u x S wi tch Resistance vs. Vaux

200

180

160

140

120

100

Re sistan ce [mOh m]

80

60

2.7 3 3.3 3.6

Vaux [V]

12/5/2000