Datasheet

Micrel, Inc. MIC2954
September 2007 3
M9999-090607
Pin Configuration
1OUT
SNS
SHDN
GND
8IN
FB
TAP
ERR
7
6
5
2
3
4
1
23
IN GND OUT
8-Pin SOIC (M) 3-Pin SOT-223 (S)
1IN
2 GND
3 OUT
TO-92
TAB
3 OUT
2GN
D
1IN
3-Pin TO-92 (Z) 3-Pin TO-220 (T)
Pin Description
Pin No.
SOIC-8
Pin No.
SOT-223
Pin No.
TO-92
Pin No.
TO-220
Pin Name Pin Name
8 1 1 1 IN Supply Input.
4 2, TAB 2 2 GND Ground.
1 3 3 3 OUT Regulator Output.
2 SNS
Sense (Input): Output-sense-voltage end of internal resistive divider.
Connect to OUT (V
OUT
= 5V) for fixed5V operation; also see TAP.
Not used in adjustable configuration.
3 SHDN
Shutdown (Input): Active-low input enables regulator.
(Low = enable; high = shutdown.)
5 /ERR
Error Flag (Output): Open collector (active-low) output. Active state
indicates an output (V
OUT
) undervoltage condition.
(Low = error, floating = normal.)
6 TAP
Divider Tap (Output): Resistive voltage divider tap. With 5Vapplied to
SNS, VTAP is approximately 1.23V. Connect to FB for 5V operation.
Not used in adjustable configuration.
7 FB
Feedback (Input): Error amplifier input. Compared to internal1.23V
reference. Connect to external voltage divider for adjustable operation
or internal voltage divider (TAP) for 5V operation (see SNS, TAP).