MIC5156 Micrel Semiconductor, MIC5156 Datasheet - Page 3

• Manufacturer Part Number: MIC5156
• Description: Super LDO Regulator Controller
• Manufacturer: Micrel Semiconductor

MIC5156/5157/5158
Pin Description MIC5156
Pin Description MIC5157, MIC5158
13 (MIC5157)
13 (MIC5158)
8 (adjustable)
Pin Number
Pin Number
1 (MIC5157)
1 (MIC5158)
2 (MIC5157)
2 (MIC5158)
8 (3.3V, 5V)
10
11
12
14
1
2
3
4
5
6
7
3
4
5
6
7
8
9
Pin Name
Pin Name
5V FB
FLAG
FLAG
GND
GND
3.3V
V
V
C2–
C2+
C1+
C1–
V
EN
EN
EA
5V
EA
V
G
D
G
D
S
S
S
DD
CP
DD
P
Pin Function
Enable (Input): TTL high enables regulator; TTL low shuts down regulator.
Output Flag (Output): Open collector output is active (low) when V
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 resistor
(R
ground near device.
Gate (Output): Drives the gate of the external MOSFET.
Drain and Current Limit (Input): Connect to external MOSFET drain and
external sense resistor (current limit), or connect to V
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 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
or more below its nominal value.
Circuit ground.
Voltage Tripler Output [Filter Capacitor]. Connect a 1 to 10 F capacitor to ground.
Charge Pump Capacitor 2: Second stage of internal voltage tripler. Connect a
0.1 F 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
0.1 F capacitor from C1+ to C1–.
Charge Pump Capacitor 1: See C1+ pin 8.
Supply Voltage (Input): Supply voltage connection. Connect sense resistor
(R
ground near device.
Gate (Output): Connect to External MOSFET gate.
Drain and Current Limit (Input): Connect to external MOSFET drain and
external sense resistor (current limit), or connect to V
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
resistive divider and source of external MOSFET.
Enable (Input): TTL high enables regulator; TTL low shuts down regulator.
S
S
) to V
) to V
3-114
DD
DD
if current limiting used. Connect supply bypass capacitor to
if current limiting used. Connect supply bypass capacitor to
DD
DD
and external MOSFET
and external MOSFET
OUT
March 1999
OUT
is more
is 8%
Micrel