MIC5159
Programmable Current Limit µCap LDO
Regulator Controller
General Description
Micrel’s MIC5159 is a precision-voltage regulator
controller. Used with an external P-Channel MOSFET, the
MIC5159 forms a two-chip low-dropout regulator capable
of driving a wide range of output currents.
The MIC5159 operates from an input of 1.65V to 5.5V. The
low input voltage allows the MIC5159 to operate off of high
power 1.8V rails to generate lower voltages such as 1.5V.
Features of the MIC5159 include enable input and current-
limit protection. As a µCap design, the MIC5159 is stable
with ceramic output capacitors.
The MIC5159 is packaged in the IttyBitty
®
SOT-23-6, and
is offered in fixed and adjustable output voltages. Junction
temperature range of the MIC5159 is from –40°C to
+125°C.
Features
•
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Fast transient response
Input voltage range: V
IN
1.65V to 5.5V
±1.0% initial output tolerance
Fixed 1.8V or adjustable output voltage down to 1.25V
Stable with ceramic output capacitor
Capable up to 10A
Excellent line and load regulation specifications
Logic-controlled shutdown
Programmable current limit
Current-limit protection
IttyBitty
®
SOT-23-6 package
Available temperature range:–40°C to +125°C
Applications
Ultra-high current, ultra-low dropout voltage regulator
High-efficiency linear power supplies
Low-voltage distributed power
Fixed telecom
Multimedia and PC power supplies
Battery chargers
Low-voltage DSP, microprocessor and microcontroller
power supplies
Typical Application
Q1–Q4
SUB15P01–52 × 4
V
IN
V
OUT
U1 MIC5159BM6/YM6
C1
5
1
3
R1
C1
C1
EN
IN
IS
GATE
FB
GND
10A
R2
100mA
GND
GND
V
IN
= 3.3V
V
OUT
= 2.5V
C
OUT
= 200µF
Adjustable Output Voltage
IttyBitty is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 2008
M9999-082808-B
Micrel, Inc.
MIC5159
Ordering Information
Part Number
Standard
MIC5159BM6
MIC5159-1.8BM6
MIC5159-3.0BM6
(2)
Notes:
1. Other voltage available. Contact Micrel for details.
2. Special order. Contact factory.
Marking
LZAA
LZ18
LZ30
Voltage
(1)
Adj.
1.8V.
3.0V
Pb-Free
MIC5159YM6
MIC5159-1.8YM6
Contact Factory
Junction
Temp. Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
SOT-23-6
SOT-23-6
SOT-23-6
Pin Configuration
ADJ EN GATE
6
5
4
OUT EN GATE
6
5
4
Pin 1
Index
1
LZAA
2
3
Pin 1
Index
1
LZxx
2
3
IN GND IS
SOT-23-6 (M6)
Adjustable Voltage Version
IN GND IS
SOT-23-6 (M6)
Fixed Voltage Version
Pin Description
Pin Number
Pin Name
Pin Function
1
2
3
4
5
6
IN
GND
IS
GATE
EN
ADJ
OUT
Input Voltage.
Ground.
Current Sense: IS must be tied to VIN pin if the current limit feature is not used.
Gate drive of the external P-Channel MOSFET.
Enable Input: Logic Level ON/OFF control. Logic high = ON; logic low = OFF.
Adjustable Regulator Feedback Input: Connect to resistor voltage divider.
Output Voltage: Connect to drain of P-Channel MOSFET to regulate output to
proper voltage.
August 2008
2
M9999-082808-B
Micrel, Inc.
MIC5159
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ....................................................+6.0V
Enable Input Voltage (V
EN
)..........................................+6.0V
Power Dissipation (P
D(max)
) ........................................
Note 3
Storage Temperature (T
s
) .........................–65°C to +150°C
Lead Temperature (soldering, 5 sec.)........................ 260°C
EDS Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply voltage (V
IN
) ................................... +1.65V to +5.5V
Enable Input Voltage (V
EN
)................................ 0V to +5.5V
Junction Temperature (T
J
) ..................–40°C
≤
T
J
≤
+125°C
Package Thermal Resistance
SOT-23-6 (θ
JA
).................................................235°C/W
Electrical Characteristics
(5)
T
A
= 25°C with V
IN
= V
OUT
+ 1V; V
EN
= 1.2V, C
IN
= C
OUT
= 10µF, ceramic, I
OUT
= 10mA;
bold
values indicate –40°C < T
J
< +125°C;
unless otherwise specified,
Note 3
Parameter
Condition
Min
Typ
Max
Units
Output Voltage Accuracy
Output Voltage Line Regulation
Output Voltage Load Regulation
Ground Pin Current
(6)
At 25°C
Over temperature range
V
IN
= V
OUT
+ 1.0V to 5.5V
I
L
= 10mA to 1.0A
V
EN
≤
0.2V (MIC5159 OFF)
V
EN
≥
1.2V (MIC5159 ON)
–1
–2
+1
+2
%
%
%/V
%
µA
mA
µA
V
V
V
–0.1
0.007
0.2
15
10
+0.1
1.0
30
20
1
Adjust Pin Bias Current
Maximum V
GS
(PFET fully ON); V
IN
= 5.0V
(PFET fully ON); V
IN
= 3.3V
(PFET fully ON); V
IN
= 2.5V
Current-Limit Threshold
Start-up Time
Enable Input
4.5
3.1
2.3
40
50
30
1.2
0.2
20
V
IN
– V
IS
V
EN
= V
IN
Regulator enabled
Regulator shutdown
Enable hysteresis
65
150
mV
µs
V
V
mV
nA
µA
Enable Input Threshold
50
0.01
250
Enable Pin Input Current
Notes:
Independent of state
1
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. P
D(max)
= (T
J(max)
– TA) ÷
θ
JA
, where
θ
JA
depends upon the printed circuit layout, see “Applications Information.”
4. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
5. Specification for packaged product only.
6. I
GND
is the quiescent current. I
IN
= I
GND
+ I
OUT
.
August 2008
3
M9999-082808-B
Micrel, Inc.
MIC5159
Typical Characteristics
1.250
REFERENCE VOLTAGE (V)
1.245
1.240
1.235
1.230
1.225
1.65
2.15
2.65
3.15
3.65
4.15
4.65
5.15
5.65
1.220
Reference Voltage
vs. Input Voltage
REFERENCE VOLTAGE (V)
1.240
1.239
1.238
1.237
1.236
1.235
1.234
1.233
1.232
Reference Voltage
vs. Temperature
V
IN
= 3.3V
OUTPUT VOLTAGE (V)
1.240
1.239
1.238
1.237
1.236
1.235
1.234
1.233
1.232
1.231
Output Voltage
vs. Load
V
IN
= 2.5V
INPUT VOLTAGE (V)
1.231
1.230
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1.230
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
LOAD (A)
10
Quiescent Current
vs. Input Voltage
10
Quiescent Current
vs. Temperature
QUIESCENT CURRENT (mA)
10
Quiescent Current
vs. Load
QUIESCENT CURRENT (mA)
9
8
7
6
5
4
3
2
1
0
I
LOAD
= 10mA
QUIESCENT CURRENT (mA)
9
8
7
6
5
4
3
2
1
V
IN
= 3.3V
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
INPUT VOLTAGE (V)
9
8
7
6
5
4
3
2
1
V
IN
= 2.5V
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
LOAD (A)
1.65
2.15
2.65
3.15
3.65
4.15
4.65
5.15
CURRENT LIMIT THRESHOLD (mV)
60
58
56
54
52
50
48
46
44
42
40
CURRENT LIMIT THRESHOLD (mV)
Current Limit Threshold
vs. Input Voltage
5.65
60
58
56
54
52
50
48
46
44
Current Limit Threshold
vs. Temperature
ENABLE THRESHOLD (mV)
800
700
600
500
400
300
200
100
Enable Threshold
vs. Temperature
EN on
EN off
INPUT VOLTAGE (V)
42
40
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1.65
2.15
2.65
3.15
3.65
4.15
4.65
5.15
700
Enable Threshold
vs. Input Voltage
SHUTDOWN CURRENT (µA)
EN on
5.65
20
18
16
14
12
10
8
6
4
2
0
Shutdown Current
vs. Input Voltage
-40°C
25°C
85°C
ENABLE THRESHOLD (mV)
600
500
400
300
200
100
EN off
1.65
2.15
2.65
3.15
3.65
4.15
4.65
5.15
5.65
1.65
2.15
2.65
3.15
3.65
4.15
4.65
5.15
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
August 2008
4
5.65
0
M9999-082808-B
Micrel, Inc.
MIC5159
Functional Characteristics
2A
10mA
V
IN
= 1.8V
V
OUT
= 1.5V
C
OUT
= 100µF
V
IN
= 3.3V
V
OUT
= 1.8V
August 2008
5
M9999-082808-B
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