CMPWR025 datasheet(2/8 Pages) ONSEMI

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CMPWR025

http://onsemi.com

TYPICAL APPLICATION CIRCUIT

VCC1

CMPWR025

SIMPLIFIED ELECTRICAL SCHEMATIC

GND

VCC2

HYS

VOUT

COUT

10 mF

−

VCC1

5 V

VCC2

5 V

GND

VOUT

VCC1

VCC2

HYS

GND

SW1

0.2 W

SW2

0.2 W

PACKAGE / PINOUT DIAGRAM

Top View

8−Pin MSOP

CMPWR025R

VCC1

HYS

VOUT

GND

VCC1

VCC2

VOUT

Table 1. PIN DESCRIPTIONS

Pin(s)

Name

Description

1, 2

VCC1

VCC1 is the primary power source, which is given priority when present. If pin 8 (HYS) is unconnected, then

the hysteresis level is 75 mV (typ.). Whenever the primary power source drops below the secondary supply

VCC2 by more than 125 mV, it will immediately become deselected. When the primary power source is

restored to within 50 mV of the secondary supply, the primary power source will once again be selected and

provide all the output current. When VCC1 is selected, it will supply all the internal current requirements which

are typically 20 mA. When VCC1 is not selected, there will be no current loading on this input.

Pins 1 & 2 must be connected together externally.

3, 4

VCC2

VCC2 is the secondary power source and is selected when the primary source has fallen below it by more

than 125 mV (or 200 mV if pin 8 is grounded). The secondary source will be deselected immediately once the

primary source is restored to within 50 mV of VCC2. When VCC2 is selected, it will supply all the internal

current requirements which are typically 20 mA. When VCC2 is not selected, there will be no current loading on

this input.

Pins 3 & 4 must be connected together externally.

GND

Negative reference for all voltages.

6, 7

VOUT

Positive voltage output switched from VCC1 or VCC2 inputs. During normal operation the impedance from

VOUT to the selected supply is typically less than 0.28 W, which results in minimal voltage loss from input to

output. During the cold−start interval when both inputs are initially applied, the internal circuitry provides a soft

turn−on for the switches, which limits peak in−rush current.

Pins 6 & 7 must be connected together externally.

HYS

HYS is the user−selectable hysteresis input. The hysteresis level is set to 150 mV when pin 8 is grounded.

The default hysteresis level is set to 75 mV by leaving pin 8 unconnected. Using 150 mV hysteresis is

recommended, especially in environments with noisy power supplies, high power supply resistances or high

load currents. If the hysteresis level is set to 150 mV, the primary supply VCC1 must now fall 200 mV below

the secondary supply VCC2 before it becomes deselected.

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