Micrel, Inc.
MIC2954
Pin Configuration
OUT 1
SNS 2
SHDN 3
GND 4
8 IN
7 FB
6 TAP
5 ERR
1
IN
2
3
GND OUT
8-Pin SOIC (M)
3-Pin SOT-223 (S)
3
2
TO-92
1
OUT
3
TAB
OUT
GND
IN
GND
IN
2
1
3-Pin TO-220 (T)
3-Pin TO-92 (Z)
Pin Description
Pin No.
SOIC-8
8
4
1
2
Pin No.
SOT-223
1
2, TAB
3
Pin No.
TO-92
1
2
3
Pin No.
TO-220
1
2
3
Pin Name
IN
GND
OUT
SNS
Pin Name
Supply Input.
Ground.
Regulator Output.
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.
Shutdown (Input): Active-low input enables regulator.
(Low = enable; high = shutdown.)
Error Flag (Output): Open collector (active-low) output. Active state
indicates an output (V
OUT
) undervoltage condition.
(Low = error, floating = normal.)
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.
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).
3
5
SHDN
/ERR
6
TAP
7
FB
September 2007
3
M9999-090607
MICREL [ MICREL SEMICONDUCTOR ]
