Datasheet CMPWR300 Datasheet (California Micro Devices)

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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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

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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

CALIFORNIA MICRO DEVICES

CMPWR300

Fig 1.4. Ground Current

Fig 1.4.

Ground Current is shown across the entire range of load

conditions. The ground current has minimal variation

across the range of load conditions and shows only a

slight increase at maximum load due to the current limit

protection circuitry.

Fig 1.5.

V

Supply Current of the device is shown across the

CC

entire V

range for both V

CC

present (3.3V) and absent

AUX

(0V).

[mA]

GND

I

10000

1000

2.0

1.5

1.0

0.5

0.0
0 100 200 300 400 500

Load Current [mA]

Fig 1. 5. Vcc Supply Current (No Load)

Vaux = 0V

In the absence of V

at approximately 1mA when V

, the supply current remains fixed

AUX

reaches the voltage level

CC

of about 2.5V. At this point the regulator is enabled and

a supply current of 1.0mA is conducted.

When V

10uA until V

powers the controller (0.15mA). When V

is present, the VCC supply current is less than

AUX

exceeds V

CC

, at which point VCC then

AUX

reaches V

CC

SELECT

the regulator is enabled.

[µA]

CC

I

100

V aux = 3.3V

,

10

12345

Vcc [V]

© 2000 Calirornia Micro Devices Corp. All rights reserved.

12/5/2000

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

5

CALIFORNIA MICRO DEVICES

Typical Transient Characteristics

CMPWR300

The transient characterization test setup shown below includes

the effective source impedance of the V

supply (RS). This

CC

was measured to be approximately 0.2Ω. It is recommended
that this effective source impedance be no greater than 0.25Ω

to ensure precise switching is maintained during VCC selection

and deselection.

Both the rise and fall times during V

power-up/down

CC

sequencing were controlled to be around 10 millisecond

duration. This is considered to represent worst case conditions

for most application circuits.

A maximum rated load current of 500mA was used during

characterization, unless specified otherwise.

During a selection or deselection transition the DC load current

is switching from V

. In addition to the normal load current there may also

V

CC

to VCC and vice versa, or from V

AUX

SBY

to

be an in-rush current for charging/discharging the load

capacitor. The total current pulse being applied to either

V

or VCC is equal to the sum of the dc load and the

AUX

corresponding in-rush current. Transient currents in excess

of one amp can readily occur for brief intervals when either

supply commences to power the load.

The oscilloscope traces of V

bandwidth response at the V

power-up/down show the full

CC

and V

CC

pins under full load

OUT

(500mA) conditions.

See Application note AP-211 for more details.

Cold Start and Full Power Down (Fig 2.1 to 2.6)

Cold start power up and power down from V

. The output voltage follows the input very smoothly

V

AUX

with no disturbance. As soon as the V

reaches about 2V, V

or V

V

CC

equals 3.8V. V

SBY

starts rising. It reaches 3.3V when

OUT

remains valid until VCC or V

OUT

CC or VSBY

drops below 3.8V.

Power Changeover (Fig 2.7 to 2.12)

V

CC

Power transitions between the main V

and the standby or

CC

the auxiliary sources under 375mA load. The transition

between V

on V

OUT

and V

CC

.

Transitions between V

about 120mV on V

shows a small disturbance of 80mV

SBY

and V

CC

. During power up condition, V

OUT

show a disturbance of

AUX

experiences 100mV disturbance.

©2000 California Micro Devices Corp. All rights reserved.

6

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

and

CC, VSBY

input voltage

SBY

This is due to the in-rush current during the power switching.

The built-in hysteresis of 300mV ensures the regulator

remains turned on throughout the transient.

Load and Line Transient Response (Fig 2.13 to 2.16)

The load transient response shows a 5mA to 500mA step

load with minimal disturbance on V

of 80mV. An initial

OUT

transient overshoot of 80mV occurs and the output settles

to its final voltage within a few microseconds. The dc voltage

disturbance on the output is approximately 25mV, which

demonstrates the regulator output impedance of 50mW.

The line step response shows a small disturbance of 25mV

on the output when VCC steps from 4.5V to 5.5V. When

falling from 5.5V to 4.5V, the output is almost unchanged

CC

12/5/2000

CALIFORNIA MICRO DEVICES

Typical Transient Characteristics - Cold Start and Full Power Down

CMPWR300

Fig 2.1 VCC cold start

Fig 2.3 V

cold start Fig 2.4 V

SBY

Fig 2.2 V

full power down

CC

full power down

SBY

Fig 2.5 V

© 2000 Calirornia Micro Devices Corp. All rights reserved.

12/5/2000

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

AUX

cold start

Fig 2.6 V

full power down

AUX

7

CALIFORNIA MICRO DEVICES

CMPWR300

Typical Transient Characteristics - V

Fig 2.7 VCC power up (V

Fig 2.9 V

power up (V

CC

Power Changeover

CC

= 5V)

SBY

= 3.3V) Fig 2.10 VCC power down (V

AUX

Fig 2.8 V

power down (V

CC

SBY

AUX

= 5V)

= 3.3V)

Fig 2.11 V

©2000 California Micro Devices Corp. All rights reserved.

8

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

power up (V

CC

= 3.1V)

AUX

Fig 2.12 V

power down (V

CC

= 3.1V)

AUX

12/5/2000

CALIFORNIA MICRO DEVICES

Typical Transient Characteristics - Load and Line Transient Response

CMPWR300

Fig 2.13 VCC Load Transient Response Rising

Fig 2.15 V

Load Step Response Rising Fig 2.16 VCC Load Step Response Falling

CC

Fig 2.14 V

Load Transient Response Falling

CC

© 2000 Calirornia Micro Devices Corp. All rights reserved.

12/5/2000

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

9

CALIFORNIA MICRO DEVICES

Typical Thermal Characteristics

CMPWR300

Thermal dissipation of junction heat consists primarily of

two paths in series. The first path is the junction to the case

) thermal resistance which is defined by the package style,

(θ

JC

and the second path is the case to ambient (θ

) thermal

CA

resistance, which is dependent on board layout.

The overall junction to ambient (θ

) thermal resistance is

JA

equal to:

= θJC + θ

θ

JA

CA

For a given package style and board layout, the operating

junction temperature is a function of junction power

dissipation P

, and the ambient temperature, resulting in

JUNC

the following thermal equation:

T

JUNC

= T

= T

AMB

AMB

+ P

+ P

JUNC

JUNC

(θ

(θ

JC

JA

) + P

)

JUNC

(θ

CA

)

The CMPWR300SA is housed in a thermally enhanced

package where the GND pins (5 through 8) are integral to

the leadframe (fused leadframe). When the device is mounted

on a double sided printed circuit board with two square

inches of copper allocated for heat spreading, the resulting

is 50°C/W.

θ

JA

Based on a maximum power dissipation of 1.0W (2Vx500mA)

with an ambient of 70°C the resulting junction temperature

will be:

T

JUNC

AMB

+ P

JUNC

(θ

)

JA

= T

= 70°C + 1.0W (50°C/W)

= 70°C + 50°C = 120°C

All thermal characteristics of the CMPWR300SA were

measured using a double sided board with two square inches

of copper area connected to the GND pins for heat

spreading.

Measurements showing performance up to junction

temperature of 125°C were performed under light load

conditions (5mA). This allows the ambient temperature to

be representative of the internal junction temperature.

Note: The use of multi-layer board construction with power

planes will further enhance the thermal performance of the

package. In the event of no copper area being dedicated for

heat spreading, a multi-layer board construction will typically

provide the CMPWR300SA with an overall θ

of 70°C/W

JA

which allows up to 780mW to be safely dissipated.

Fig 3.1. Output Voltage vs. Temperature.

This shows the regulator V

performance up to the

OUT

maximum rated junction temperature. The overall 125°C

variation in junction temperature causes an output voltage

change of about 30mV.

©2000 California Micro Devices Corp. All rights reserved.

10

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

12/5/2000

CALIFORNIA MICRO DEVICES

Typical Thermal Characteristics contd

Fig 3.2. Output Voltage (Rated) vs. Temperature. This

shows the regulator steady state performance when fully

loaded (500mA) in an ambient temperature up to the rated

maximum of 70°C. The output variation at maximum load is

below 10mV across the normal temperature operating.

Fig 3.3. Thresholds vs. Temperature.

This shows the regulator select/deselect threshold variation

up to the maximum rated junction temperature. The overall

125°C change in junction temperature causes a 30mV

variation in the select threshold voltage (regulator enable).

The deselect threshold level varies about 30mV over the

125°C change in junction temperature. This results in the

built-in hysteresis have a minimal variation of 40mV over

the entire operating junction temperature range. The hysteresis

increases with temperature up to 240mV at 125°C.

CMPWR300

Fig 3.2. Output Voltage (Rated) vs.

Temperature

3.320

3.310

3.300

Vout [V]

3.290

3.280
0 10203040506070

Ambient Temperature [° C]

Fig 3.3. Thre sholds vs. Te m pera ture

4.5

4.4

4.3

Threshold [V]

4.2

500mA load

Vselect

Vdeselect

Fig 3.4. V

This shows the V

Switch Resistance vs. Temperature.

AUX

switch ON resistance variation up to the

AUX

maximum rated junction temperature. The overall 125°C

change in junction temperature causes a 80mΩ variation in

the switch resistance. The switch resistance remains below

0.2Ω, even at a junction temperature of 125°C.

© 2000 Calirornia Micro Devices Corp. All rights reserved.

12/5/2000

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

4.1
0 25 50 75 100 125 150

Junction Temperature [°C]

Fig 3.4. Vaux Switch Resistance vs.

200

160

120

80

Re sistan c e [mOh m]

40

0

0255075100125

Temperature

Junction Temperature [°C]

11