California Micro Devices CMPWR150 Datasheet

CALIFORNIA MICRO DEVICES

500mA / 3.3V SmartOR POWER REGULATOR

Features Pin Diagrams

 Automatic detection of V

 Drive output logic to control external switch

 Glitch-free output during supply transitions

 500mA output maximum load current

 Built-in hysteresis during supply selection

 Controller operates from either V

 8-pin SOIC Thermal or 5-pin TO-263 packages

Applications

 PCI adapter cards

 Network Interface Cards (NICs)

 Dual power systems

 Systems with standby capabilities

 See Application Note AP-211

Product Description

California Micro Devices SmartOR

low dropout regulator that delivers up to 500mA of

load current at a fixed 3.3V output. An internal threshold

level (typically 4.1V) is used to prevent the regulator

from being operated below dropout voltage. The device

continuously monitors the input supply and will

automatically disable the regulator when V

the threshold level. When the regulator is disabled, the

control signal Drive (Active Low) is enabled, which

allows an external PMOS switch to power the load from

an auxiliary 3.3V supply.

input supply

CC

or V

CC

TM

CMPWR150 is a

OUT

falls below

CC

Top View

n.c.

V

CC

GND

V

OUT

Drive

CMPWR150TO

5-pin TO-263 Package

Typical Application Circuit

Drive GND

CMPWR150

CMPWR150

Top View

n.c. GND

V

GND

CC

GND

V

OUT

CMPWR150SA

8-pin SOIC Thermal Package

When V

the control signal for the external PMOS switch is disabled

is restored to a level above the select threshold,

CC

Simplified Electrical Schematic

and the regulator is once again enabled.

All the necessary control circuitry needed to provide a

smooth and automatic transition between the supplies

has been incorporated. This allows V

switched without loss of output voltage.

to be dynamically

CC

The CMPWR150 is available in either an 8-pin SOIC

thermally enhanced package, ideal for space critical

applications, or a 5-pin TO-263 package.

NOITAMROFNIGNIREDROTRAPDRADNATS

egakcaP rebmuNtraPgniredrO

sniPelytSgnikraMtraPleeR&epaTsebuT

8lamrehTCIOSAS051RWPMCR/AS051RWPMCT/AS051RWPMC

5362-OTOT051RWPMCR/OT051RWPMCT/OT051RWPMC

© 1999 California Micro Devices Corp. All rights reserved.

9/99

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

SmartOR is a trademark of California Micro Devices Corp.

C0590899

1

CALIFORNIA MICRO DEVICES

CMPWR150

SGNITARMUMIXAMETULOSBA

retemaraPgnitaRtinU

)MBH(noitcetorPDSE0002V

V

CC

egatloVtupnI5.0-dnG,0.6+V

egatloVcigoLevirDV

CC

egnaRerutarepmeTegarotS051+ot04-

5.0-dnG,5.0+V

o

C

tneibmAgnitarepO07+ot0

noitcnuJgnitarepO521+ot0

362-OT:noitapissiDrewoP

1etoN

CIOS

0.1W

SNOITIDNOCGNITAREPO

retemaraPegnaRtinU

V

CC

)tneibmA(erutarepmeT07+ot0

5.0±0.5V

o

C

tnerruCdaoL005ot0Am

C

TXE

%01±01

mF

SCITSIRETCARAHCGNITAREPOLACIRTCELE

)esiwrehtodeificepssselnusnoitidnocgnitareporevo(

lobmySretemaraPsnoitidnoCNIMPYTXAMTINU

V

TUO

I

TUO

V

LESCC

V

SEDCC

V

I

I

V

V

I

I

R

R

t

t

Note 1: The SOIC package used is thermally enhanced through the use of a fused integral leadframe. The power rating is based on a printed

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

Note 3: Ground pin current consists of controller current (0.15mA) and regulator current if enabled. The controller always draws 0.15mA from

©1999 California Micro Devices Corp. All rights reserved.

2

TSYHCC

C/S

CCR

CC

DNG

HO

LO

HD

LD

V

CC

DAOLR

ENILR

circuit board heat spreading capability equivalent to 2 square inches of copper connected to the GND pins. Typical multi-layer boards

using power plane construction will provide this heat spreading ability without the need for additional dedicated copper area. (Please

consult with factory for thermal evaluation assistance.)

impedance be kept below 0.25

An input capacitor may be required to help minimize the switching transient.

CC

or V

either V

occurs due to current limit protection circuitry.

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

egatloVtceleSdelbanErotalugeR53.454.4

egatloVtceleseDdelbasiDrotalugeR09.301.4V

egatloVsiseretsyHsiseretsyH

noitalugeRdaoLV

noitalugeReniLV

tnerruCniPdnuorG

yaleDhgiHevirDC

yaleDwoLevirDC

, whichever is greater. All regulator current is supplied exclusively from V

OUT

egatloVtuptuOrotalugeRI>Am005

Am0>531.303.3564.3V

DAOL

tnerruCtuptuOrotalugeR 005008Am

2etoN

tnerruCtuptuOtiucriCtrohSV

CC

egakaeLesreveRniPV

CC

CC

tnerrucylppuStnecseiuQV

CC

V

V

3etoN

V

CC

V

CC

ecnatsiseRpu-lluPevirDR

ecnatsiseRnwod-lluPevirDR

Ω

to ensure the switching disturbance remains below the hysteresis during select/deselect transitions.

V,V5=

TUO

I,V5=

V>

V>

SEDCC

V>

TUO

CC

V0=0021Am

TUO

V,V3.3=

DAOL

,LESCC

CC

V0=505

CC

I,V5.5otV5.4=

DAOL

I

DAOL

V>

Am0=0.10.3

TUO

delbasiDrotalugeR51.003.0

I,V5=

DAOL

I,V5=

DAOL

Vot

PULLUP

CC

NWODLLUP

EVIRD

EVIRD

V,Fn1=

V,Fn1=

Am5=0.15.2Am

Am005=2.10.3

V,

V>

CC

V,DNGot

t

CC

ESIR

t

CC

LLAF

LESCC

V>

SEDCC

sn001<0.1

sn001<2.0

during switching. It is recommended that the VCC source

CC

Am005otAm05=57Vm

Am5=2Vm

CC

. At high load currents a small increase

CC

52.0

51.052.0Am

10.020.0

001004

002004

mA

W

ms

9/99

CALIFORNIA MICRO DEVICES

Interface Signals

VCC is the power source for the internal regulator and is

monitored continuously by an internal controller circuit.

Whenever V

exceeds V

CC

regulator (500mA max) will be enabled and deliver a fixed

3.3V at V

. When VCC falls below V

OUT

the regulator will be disabled

Internal loading on this pin is typically 1.0mA when the

regulator is enabled, which reduces to 0.15mA whenever

the regulator is disabled. If V

the V

pin the VCC loading will further reduce to only a

OUT

few microamperes.

During a V

step increase in V

power up sequence, there will be an effective

CC

CC

enabled. The amplitude of this step increase will depend

on the dc load current and any necessary current required

for charging/discharging the load capacitance. This line

current transient will cause a voltage disturbance at the V

pin. The magnitude of the disturbance will be directly

proportional to the effective power supply source

impedance being delivered to the V

To prevent chatter during Select and Deselect transitions, a

built-in hysteresis voltage of 250mV has been incorporated.

It is recommended that the power supply connected to

input should have a source resistance of less than

the V

CC

0.25Ω to minimize the event of chatter during the enabling/

disabling of the regulator.

An input filter capacitor in close proximity to the V

will reduce the effective source impedance and help

(4.35V typically), the internal

CCSEL

(4.10V typically)

CCDES

falls below the voltage on

CC

line current when the regulator is

input.

CC

pin

CC

CMPWR150

minimize any disturbances. If the V

inches of the main input filter, a capacitor may not be

necessary. Otherwise an input filter capacitor in the range

of 1uF to 10uF will ensure adequate filtering.

GND is the negative reference for all voltages. The current

that flows in the ground connection is very low (typically

1.0mA) and has minimal variation over all load conditions.

is the regulator output voltage connection used to

V

OUT

power the load. An output capacitor of ten microfarads is

used to provide the necessary phase compensation, thereby

preventing oscillation. The capacitor also helps to minimize

the peak output disturbance during power supply

changeover.

When V

falls below V

CC

, then V

OUT

the necessary quiescent current for the internal reference

circuits. This ensures excellent start-up characteristics for

CC

the regulator.

DRIVE is an active LOW logic output intended to be used

as the control signal for driving an external PFET whenever

the regulator is disabled. This will allow the voltage at V

to be powered from an auxiliary supply voltage (3.3V).

The Drive pin is pulled HIGH to V

is enabled. This ensures that the auxiliary remains isolated

during normal regulator operation.

n.c. pins are electrically isolated from the internal circuitry.

These pins can be connected to any external voltage level

without impacting the device funtionality.

pin is within a few

CC

will be used to provide

OUT

whenever the regulator

CC

OUT

lobmySnoitpircseD

V

CC

DNG.segatlovllarofecnereferevitageN

V

TUO

evirD

.c.n .yrtiucriclanretnimorfdetalosiyllacirtceleerahcihwsnipdetcennocnU

© 1999 California Micro Devices Corp. All rights reserved.

9/99

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

Vnoegatlov

TUO

Vnehwylppusegatlov

CC

SNOITCNUFNIP

VnehW.rotalugerroftupniylppuSevitisoP

CC

nehwrotaluger)V3.3(tuptuoegatlovrotalugeRV

CC

nehW.tneserpsiV

CC

.secnereferlanretniehtsaibotdesusi

.tneserptonsi

.delbasidsirotalugereht,V1.4wolebsllaf

eht,tneserptonsi

yrailixuanagnitcelesrofhctiwsSOMPlanretxelortnocotdednetnituptuOcigoLSOMC

3