CM3512 Datasheet, PDF (3/11 Pages) California Micro Devices Corp – Dual USB Overcurrent 1.2A Switches with Independent Controls

CALIFORNIA MICRO DEVICES
Pin Functions
Preliminary
CM3512
V_CC is the power source.
V_OUT1 provides the power for the first load. The internal
MOSFET switches are designed for very low voltage drops
from the voltage input pins at their full rated currents.
V_OUT2 provides the power for the second load. The internal
MOSFET switches are designed for very low voltage drops
from the voltage input pins at their full rated currents.
Current loads of up to 1200mA are allowed. Current
loads above 1200mA may cause the constant-current
limiting circuit to operate, thereby reducing the output
voltage.
Continuous over-current loads will cause the part’s
internal temperature to rise. If the internal temperature
exceeds 150’C then any switch that is in overcurrent
mode will be immediately turned off. Any switch that is
not in overcurrent mode will remain on – it will not be
affected by the over-temperature detection. Once the
part has cooled to 125’C then the switch or switches
that were in overcurrent mode will be automatically
turned on again.
EN1#, EN2# are the active low logic input pins that
are used to control the power switches. Both
switches are independent. Set EN1# and EN2# high
(to >2V) to deselect V_OUT1 and V_OUT2 respectively, and
set EN1# and EN2# low (to <0.8V) to select V_OUT1
and V_OUT2 respectively.
OC1#, OC2# are independent active low open-
drain outputs, indicating an overcurrent fault condition
has been detected at V_OUT1 or V_OUT2. There is a built-
in 10msec (min.) fault blanking delay after the
overcurrent fault condition has been detected, before
these outputs become active. The OC# outputs
become inactive only when both the overcurrent
condition stops and when the voltage drop across the
switch is less than 1V. External pull-up resistors of
10k - 100k are required if the OC# outputs are used.
Because they are open-drain, the two OC# outputs
can be shorted together to make one OC# signal.
GND is the negative reference for all voltages.
During the cold-start interval when the input is initially
applied, internal circuitry provides a soft turn-on for the
switch, which limits peak in-rush current.
Pin No.
1
2
3
4
5
6
7
8
Symbol
GND
V_CC
EN1#
EN2#
OC2#
V_OUT2
V_OUT1
OC1#
Pin Functions
Description
Negative reference for all voltages.
Power supply input.
Active low Enable pin for V_OUT1.
Active low Enable pin for V_OUT2.
Active low when V_OUT2 is in overcurrent mode.
Output voltage #2.
Output voltage #1.
Active low when V_OUT1 is in overcurrent mode.
Pins
8
Package
SOIC
STANDARD PART ORDERING INFORMATION
Ordering Part Number¹
Part Marking
CM3512-04SN
CM3512-04SN
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2003 California Micro Devices Corp. All rights reserved
11/10/03 ^{430 N. McCarthy Blvd, Milpitas, California 95035 Tel: [phone] Fax: [phone]}
www.calmicro.com
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