MIC5156/5157/5158
Micrel
MIC5156/5157/5158
Super LDO™ Regulator Controller
General Description
The MIC5156, MIC5157, and MIC5158 Super Low-Dropout
(LDO) Regulator Controllers are single IC solutions for high-
current low-dropout linear voltage regulation. Super LDO™
Regulators have the advantages of an external N-channel
power MOSFET as the linear pass element.
The MIC5156/7/8 family features a dropout voltage as low as
the R
DS(ON)
of the external power MOSFET multiplied by the
output current. The output current can be as high as the
largest MOSFETs can provide.
The MIC5156/7/8 family operates from 3V to 36V. The
MIC5156 requires an external gate drive supply to provide the
higher voltage needed to drive the gate of the external
MOSFET. The MIC5157 and MIC5158 each have an internal
charge pump tripler to produce the gate drive voltage. The
tripler is capable of providing enough voltage to drive a logic-
level MOSFET to 3.3V output from a 3.5V supply and is
clamped to 17.5V above the supply voltage. The tripler
requires three external capacitors.
The regulator output is constant-current limited when the
controller detects 35mV across an optional external sense
resistor. An active-low open-collector flag indicates a low
voltage of 8% or more below nominal output. A shutdown
(low) signal to the TTL-compatible enable control reduces
controller supply current to less than 1µA while forcing the
output voltage to ground.
The MIC5156-3.3 and MIC5156-5.0 controllers have inter-
nally fixed output voltages. The MIC5156 [adjustable] output
is configured using two external resistors. The MIC5157 is a
fixed output controller which is externally configured to select
either 3.3V, 5.0V, or 12V. The MIC5158 can be configured as
a fixed 5V controller or programmed to any voltage from 1.3V
to 36V using two external resistors.
The MIC5156 is available in an 8-pin plastic DIP, ceramic
DIP, or SOIC package. The MIC5157 and MIC5158 are
available in a 14-pin plastic DIP, ceramic DIP, or SOIC. The
plastic DIP and SOIC versions operate from –40°C to +85°C.
The ceramic DIP versions cover the –55°C to +125°C military
temperature range.
Features
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4.5mA typical operating current
<1µA typical standby current
Low external parts count
Optional current limit (35mV typical threshold)
1% initial output voltage tolerance in most configurations
2% output voltage tolerance over temperature
Fixed output voltages of 3.3V, 5.0V (MIC5156)
Fixed output voltages of 3.3V, 5.0V, 12V (MIC5157)
Programmable (1.3 to 36V) with 2 resistors (MIC5156/8)
Internal charge pump voltage tripler (MIC5157/8)
Enable pin to activate or shutdown the regulator
Internal gate-to-source protective clamp
All versions available in DIP and SOIC
Ultra-high current ultra-low dropout voltage regulator
Constant high-current source
Low parts count 5.0V to 3.3V computer supply
Low noise/low-dropout SMPS post regulator
High-current, current-limited switch
Applications
Typical Applications
+12V
0.1µF
1.0µF
Enable
Shutdown
0.1µF
7
C2+
4
V
P
3
GND
2
FLAG
1
EN
6
C2–
5
V
CP
4
GND
FLAG
3
3.3V
S
2
1
5V
EN
MIC5156-3.3
C1+
C1–
V
DD
G
D
S
MIC5157
V
DD
G
D
5
6
7
8
8
0.1µF
9
10
11
12 13
14
V
IN
5V
47µF
R
S
= 0.035V / I
LIMIT
3mΩ
R
S
C
L
*
47µF
V
OUT
3.3V, 10A
V
IN
(3.61V min.)
3mΩ
47µF
R
S
Enable
Shutdown
C
L
*
47µF
V
OUT
3.3V, 10A
SMP60N03-10L
* Improves transient
response to load changes
R
S
= 0.035V / I
LIMIT
IRLZ44 (Logic Level MOSFET)
* Improves transient
response to load changes
10A 5V to 3.3V Desktop Computer Regulator
Super LDO
is a trademark of Micrel, Inc.
10A Low-Dropout Voltage Regulator
Section 5: Data Sheets
310
Designing With LDO Regulators
MIC5156/5157/5158
Micrel
Ordering Information MIC5156
Part Number
MIC5156-3.3BN
MIC5156-5.0BN
MIC5156BN
MIC5156-3.3BM
MIC5156-5.0BM
MIC5156BM
MIC5156-3.3AJ
MIC5156-5.0AJ
MIC5156AJ
Temperature Range
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
Voltage
3.3V
5.0V
Adjustable
3.3V
5.0V
Adjustable
3.3V
5.0V
Adjustable
Package
8-pin P-DIP
8-pin P-DIP
8-pin P-DIP
8-pin SOIC
8-pin SOIC
8-pin SOIC
8-pin CerDIP
8-pin CerDIP
8-pin CerDIP
Ordering Information MIC5157
Part Number
MIC5157BN
MIC5157BM
MIC5157AJ
Temperature Range
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
Voltage
Selectable
Selectable
Selectable
Package
14-pin P-DIP
14-pin SOIC
14-pin CerDIP
Ordering Information MIC5158
Part Number
MIC5158BN
MIC5158BM
MIC5158AJ
Temperature Range
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
Voltage
5.0V/Adj.
5.0V/Adj.
5.0V/Adj.
Package
14-pin P-DIP
14-pin SOIC
14-pin CerDIP
Pin Configuration
MIC5156-x.x
EN 1
FLAG 2
GND 3
V
P
4
8 S (Source)
7 D (Drain)
6 G (Gate)
5 V
D D
MIC5156
EN 1
FLAG 2
GND 3
V
P
4
8 EA
7 D (Drain)
6 G (Gate)
5 V
D D
MIC5157
5V 1
3.3V 2
FLAG 3
GND 4
V
CP
5
C2– 6
C2+ 7
14 EN
13 S (Source)
12 D (Drain)
11 G (Gate)
10 V
D D
9 C1–
8 C1+
EA 1
5V FB 2
FLAG 3
GND 4
V
CP
5
C2– 6
C2+ 7
MIC5158
14 EN
13 S (Source)
12 D (Drain)
11 G (Gate)
10 V
D D
9 C1–
8 C1+
Section 5: Data Sheets
311
Designing With LDO Regulators
MIC5156/5157/5158
Micrel
Pin Description MIC5156
Pin Number
1
2
3
4
5
Pin Name
EN
FLAG
GND
V
P
V
DD
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 resistor
(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
external 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.
6
7
G
D
8 (3.3V, 5V)
8 (adjustable)
S
EA
Pin Description MIC5157, MIC5158
Pin Number
1 (MIC5157)
1 (MIC5158)
2 (MIC5157)
2 (MIC5158)
3
4
5
6
7
8
9
10
Pin Name
5V
EA
3.3V
5V FB
FLAG
GND
V
CP
C2–
C2+
C1+
C1–
V
DD
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 resistor
(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
external 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
resistive divider and source of external MOSFET.
Enable (Input): TTL high enables regulator; TTL low shuts down regulator.
11
12
G
D
13 (MIC5157)
S
13 (MIC5158)
14
S
EN
Section 5: Data Sheets
312
Designing With LDO Regulators
MIC5156/5157/5158
Micrel
Absolute Maximum Ratings
V
DD
.............................................................................. 38V
EN ............................................................... –0.3V to 36V
V
G
(MIC5156) ................................................................ 55V
V
CP
(MIC5157/8) ........................................................... 55V
V
SOURCE
............................................................. 1.3 to 36V
FLAG ................................................................. –0.3 to 40V
Operating Junction Temperature
T
J
.......................................................................... 150°C
Ambient Temperature Range
T
A
(MIC515xBM/BN) .............................. –40°C to +85°C
T
A
(MIC515xAJ) ................................... –55°C to +125°C
Storage Temperature ............................... –65°C to +150°C
Lead Temperature
(soldering 10s) ...................................................... 300°C
Package
θ
JA
MIC5156
MIC5157/8
Plastic DIP .................... 100°C/W ..................... 90°C/W
Ceramic DIP ................. 125°C/W ................... 110°C/W
SOIC ............................ 160°C/W ................... 120°C/W
Electrical Characteristics
Symbol
V
DD
I
DD(ON)
I
DD(OFF)
I
DD(ON)
I
DD(OFF)
V
IH
V
IL
EN I
B
V
CP
f
CP
V
OUT MAX
Parameter
Supply Voltage
Supply Current MIC5156
Supply Current MIC5157/8
Enable Input Threshold
Enable Input Bias Current
Max. Charge Pump Voltage
Charge Pump Frequency
Maximum Gate Drive Voltage
(MIC5157/8)
V
SOURCE
= 0V
V
DD
= 3.5V
V
DD
= 5V
V
DD
= 12V
V
SOURCE
> V
OUT(NOM)
V
DD
– V
D
@ I
LIM
Short G (gate) to (S) source,
Note 2
MIC5156-3.3
MIC5156-5.0
MIC5157, 3.3V pin to S pin (3.3V config.)
MIC5157, 5V pin to S pin (5V config.)
MIC5157, V
DD
= 7V, (12V config.)
MIC5158, 5V FB pin to EA pin (5V config.)
MIC5156 [adjustable] and MIC5158
5V < V
DD
< 15V, V
OUT
= 3.3V
14
% of nominal V
SOURCE
% of nominal V
SOURCE
I
FLAG
= 1mA
28
3.267
4.950
3.250
4.950
11.70
4.925
1.222
5
9
24
Operating, V
EN
= 5V
Shutdown, V
EN
= 0V
Operating, V
EN
= 5V
Shutdown, V
EN
= 0V
High
Low
V
EN
= 2.4V
V
CP
– V
DD
, V
DD
> 10V
2.4
Condition (Note 1)
Min
3
2.7
0.1
4.5
0.1
1.3
1.3
20
17.5
160
7.0
11.3
28
1.0
35
3.3
5.0
3.3
5.0
12
5.0
1.235
2
16.6
92
3
0.09
0.2
42
3.333
5.050
3.350
5.050
12.30
5.075
1.248
7
20
9
15
30
Typ
Max
36
10
5
10
5
0.8
25
18.5
Units
V
mA
µA
mA
µA
V
V
µA
V
kHz
V
V
V
V
mV
V
V
V
V
V
V
V
mV
V
%
%
V
V
OUT MIN
V
LIM
V
S
Minimum Gate Drive Voltage
Current Limit Threshold
Source Voltage
V
BG
V
LR
V
GS MAX
V
FT
V
FH
V
SAT
Note 1:
Note 2:
Bandgap Reference Voltage
Output Voltage Line Regulation
Gate to Source Clamp
Flag Comparator Threshold
Flag Comparator Hysteresis
Flag Comparator Sat. Voltage
General Note:
Devices are ESD sensitive. Handling precautions recommended.
T
A
= 25°C, V
DD
= 5V, V
EN
= 5V, unless noted.
Test configuration. External MOSFET not used.
Section 5: Data Sheets
313
Designing With LDO Regulators
MIC5156/5157/5158
Micrel
Typical Characteristics
3.3V Regulator Output
Voltage vs. Temperature
3.34
5.04
5.0V Regulator Output
Voltage vs. Temperature
12
10
MIC5157/8 Turn-On
Response Time for 3.3V
MOSFET = IRF540
V
IN
= 5V, I
L
= 0.5A
C
C1
= C
C2
= 0.1µF
C
CP
= 1µF
C
L
= 50µF
LOGIC
INPUT
3.3V
OUTPUT
0.0
0.2
0.4
TIME (ms)
0.6
OUTPUT VOLTAGE (V)
3.32
3.31
3.30
3.29
3.28
3.27
3.26
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
3.33
5.03
5.02
5.01
5.00
4.99
4.98
4.97
4.96
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
VOLTAGE (V)
OFF-STATE SUPPLY CURRENT (µA)
8
6
4
2
0
-2
-0.2
ON-STATE SUPPLY CURRENT (mA)
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
0
5
10 15 20 25
SUPPLY VOLTAGE (V)
30
ON-STATE SUPPLY CURRENT (mA)
MIC5157/8 On-State Supply
Current vs. Supply Voltage
MIC5157/8 On-State Supply
Current vs. Temperature
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
V
DD
= 5V
Off-State Supply Current
vs. Temperature
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
V
DD
= 5V
Charge-Pump Output Voltage
vs. Supply Voltage
CHARGE PUMP VOLTAGE (V)
60
200
175
Flag Output Voltage
vs. Temperature
FLAG VOLTAGE (mV)
V
DD
= 5V
I
FLAG
= 1mA
1.0
0.9
Flag Output Voltage
vs. Flag Current
V
DD
= 5V
150
125
100
75
50
25
40
30
20
10
0
0
5
10 15 20 25
SUPPLY VOLTAGE (V)
30
FLAG VOLTAGE (V)
50
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
2
4
6
8
10
FLAG SINK CURRENT (mA)
0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
ENABLE THRESHOLD VOLTAGE (V)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
120
CURRENT LIMIT THRESHOLD (mV)
Enable Threshold Voltage
vs. Temperature
ENABLE BIAS CURRENT (µA)
100
80
60
40
20
0
0
Enable Input Bias Current
vs. Enable Voltage
Current Limit Threshold
vs. Temperature
70
60
50
40
30
20
10
0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
2
4 6 8 10 12 14 16
ENABLE VOLTAGE (V)
Section 5: Data Sheets
314
Designing With LDO Regulators
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