MIC5158YM Datasheet, PDF (3/13 Pages) Micrel Semiconductor – Super LDO Regulator Controller

MIC5156/5157/5158
Pin Description MIC5156
Pin Number
1
2
Pin Name
EN
FLAG
3
GND
4
V_P
5
V_DD
6
G
7
D
8 (3.3V, 5V)
S
8 (adjustable)
EA
Micrel, Inc.
Pin Function
Enable (Input): TTL high enables regulator; TTL low shuts down regulator.
Output Flag (Output): Open collector output is active (low) when V_OUT is more
than 8% below nominal output. Circuit has 3% hysteresis.
Circuit ground.
N-channel Gate Drive Supply Voltage: User supplied voltage for driving the
gate of the external MOSFET.
Supply Voltage (Input): Supply voltage connection. Connect sense resis-
tor (R_S) to V_DD if current limiting used. Connect supply bypass capacitor to
ground near device.
Gate (Output): Drives the gate of the external MOSFET.
Drain and Current Limit (Input): Connect to external MOSFET drain and ex-
ternal sense resistor (current limit), or connect to V_DD and external MOSFET
drain (no current limit).
Source (Input): Top of internal resistive divider chain. Connect directly to the
load for best load regulation.
Error Amplifier (Input): Connect to external resistive divider.
Pin Description MIC5157, MIC5158
Pin Number
1 (MIC5157)
1 (MIC5158)
2 (MIC5157)
2 (MIC5158)
3
4
5
6
7
8
9
10
11
12
13 (MIC5157)
13 (MIC5158)
14
Pin Name
5V
EA
3.3V
5V FB
FLAG
GND
V_CP
C2–
C2+
C1+
C1–
V_DD
G
D
S
S
EN
Pin Function
5V Configuration (Input): Connect to S (source) pin for 5V output.
Error Amplifier (Input): Connect to external resistive divider to obtain adjust-
able output.
3.3V Configuration (Input): Connect to S (source) pin for 3.3V output.
5V Feedback (Input): Connect to EA for fixed 5V output.
Output Voltage Flag (Output): Open collector is active (low) when V_OUT is 8%
or more below its nominal value.
Circuit ground.
Voltage Tripler Output [Filter Capacitor]. Connect a 1 to 10µF capacitor to ground.
Charge Pump Capacitor 2: Second stage of internal voltage tripler. Connect a
0.1µF capacitor from C2+ to C2–.
Charge Pump Capacitor 2: See C2– pin 6.
Charge Pump Capacitor 1: First stage of internal voltage tripler. Connect a
0.1µF capacitor from C1+ to C1–.
Charge Pump Capacitor 1: See C1+ pin 8.
Supply Voltage (Input): Supply voltage connection. Connect sense resis-
tor (R_S) to V_DD if current limiting used. Connect supply bypass capacitor to
ground near device.
Gate (Output): Connect to External MOSFET gate.
Drain and Current Limit (Input): Connect to external MOSFET drain and ex-
ternal sense resistor (current limit), or connect to V_DD and external MOSFET
drain (no current limit).
Source and 3.3V/5V Configuration: Top of internal resistor chain. Connect to
source of external MOSFET for 3.3V, 5V, and 12V operation. Also see 3.3V
and 5V pin descriptions.
Source (Input): Top of internal resistor chain. Connect to top of external resis-
tive divider and source of external MOSFET.
Enable (Input): TTL high enables regulator; TTL low shuts down regulator.
August 2005
3
MIC5156/5157/5158