CM3103 Datasheet, PDF (2/10 Pages) California Micro Devices Corp – 400mA SMARTOR REGULATOR Vaux SWITCH

CM3103
PACKAGE / PINOUT DIAGRAM
TOP VIEW
N.C.
V_CC
V_OUT
V_AUX
1
8
2
7
3
6
4
5
GND
GND
GND
GND
Note: This drawing is not to scale.
8-pin Power SOIC
PIN(S)
1
2
3
4
5-8
NAME
N.C.
V_CC
V_OUT
V_AUX
GND
DESCRIPTION
PIN DESCRIPTIONS
Positive input supply for the voltage regulator. Whenever this supply voltage exceeds the V_CCSEL
level (4.4V), it will immediately be given priority and be used to power the regulator output. If this
supply voltage falls below the V_CCDES level (4.2V) it will immediately be deselected and no longer
provide power for the regulator output. An internal hysteresis voltage of 0.2V is used to prevent any
chatter during selection and deselection of V_CC. The effective source impedance of V_CC should be
kept below 0.3 ohm to ensure changeover disturbances do not exceed the hysteresis level.
If the connection to V_CC 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 ade-
quate filtering.
Regulator output. Power is provided from the regulator or via the low impedance auxiliary switch.
This output requires a capacitance of 10µF to ensure regulator stability and minimize the peak out-
put disturbance during power supply changeover.
Auxiliary voltage power source. This supply is selected only when V_CC falls below 4.2V. Under
these conditions an internal switch that provides a very low impedance connection directly between
V_OUT and V_AUX is enabled .
The negative reference for all voltages. Also functions as a thermal path for heat dissipation.
Ordering Information
PART NUMBERING INFORMATION
Pins
8
Package
Power SOIC
Standard FInish
Ordering Part
Number¹
Part Marking
CM3103-01SA
CM3103SA
Lead-free Finish
Ordering Part
Number¹
Part Marking
CM3103-01SF
CM3103SF
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2004 California Micro Devices Corp. All rights reserved.
2 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: [phone]
L Fax: [phone] L www.calmicro.com
01/28/04