MIC5159
Micrel
MIC5159
Programmable Current Limit
µ
Cap 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
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
Applications
Ordering Information
Part Number
MIC5159BM6
MIC5159-1.8BM6
MIC5159-3.0BM6
Voltage
ADJ.
1.8V
3.0V
Marking
LZAA
LZ18
LZ30
Junction Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-23-6
SOT-23-6
SOT-23-6
Other voltages available. Contact Micrel for details.
Typical Application
Load Transient Response
V
IN
Q1ÐQ4
SUB15P01Ð52
´
4
V
OUT
5
1
3
OUTPUT VOLTAGE
(100mV/div.)
U1 MIC5159BM6
10A
C1
EN
IN
IS
GATE
FB
GND
R1
C1
R2
C1
OUTPUT CURRENT
(5A/div.)
100mA
GND
GND
V
IN
= 3.3V
V
OUT
= 2.5V
C
OUT
= 200µF
TIME (20µs/div.)
Adjustable Output Voltage
IttyBitty is a registered trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
April 2004
1
M9999-041204
MIC5159
Micrel
Pin Configuration
ADJ
6
EN GATE
5
4
VO
6
EN GATE
5
4
Pin 1
Index
1
LZAA
2
3
Pin 1
Index
1
LZxx
2
3
IN GND IS
IN GND IS
SOT-23-6 (M6)
Adjustable Voltage Version
SOT-23-6 (M6)
Fixed Voltage Version
Pin Description
Pin Number
1
2
3
4
5
6
Pin Name
IN
GND
IS
GATE
EN
ADJ.
VO
Pin Function
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.
M9999-041204
2
April 2004
MIC5159
Micrel
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
ESD 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
(4)
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
Output Voltage Accuracy
Condition
At 25°C
Over temperature range
Output Voltage Line Regulation
Output Voltage Load Regulation
Ground Pin Current
(6)
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)
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
Enable Input Threshold
Regulator enabled
Regulator shutdown
Enable hysteresis
Enable Pin Input Current
Independent of state
20
50
0.01
1
Notes:
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) – T
A
)
÷ 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
.
Min
–1
–2
–0.1
Typ
Max
+1
+2
Units
%
%
%/V
%
µA
mA
µA
V
V
V
0.007
0.2
15
10
+0.1
1.0
30
20
1
4.5
3.1
2.3
40
50
30
65
150
V
IN
– V
IS
V
EN
= V
IN
mV
µs
1.2
0.2
250
V
V
mV
nA
µA
April 2004
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M9999-041204
MIC5159
Micrel
Typical Characteristics
Reference Voltage
vs. Input Voltage
1.25
REFERENCE VOLTAGE (V)
Reference Voltage
vs. Temperature
REFERENCE VOLTAGE (V)
OUTPUT VOLTAGE (V)
Output Voltage
vs. Load
1.24
1.239
1.238
1.237
1.236
V
IN
= 2.5V
1.245
1.24
1.235
1.23
1.225
1.65
2.15
2.65
3.15
3.65
4.15
4.65
5.15
5.65
1.24
1.239
1.238
1.237
1.236
V
IN
= 3.3V
1.22
1.235
1.234
1.233
1.232
1.231
1.23
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1.235
1.234
1.233
1.232
1.231
1.23
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
LOAD (A)
INPUT VOLTAGE (V)
Quiescent Current
vs. Input Voltage
10
9
8
7
6
5
4
3
2
1
0
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
Quiescent Current
vs. Temperature
QUIESCENT CURRENT (mA)
Quiescent Current
vs. Load
10
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)
I
LOAD
= 10mA
2.15
2.65
3.15
3.65
4.15
4.65
5.15
5.65
10
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)
1.65
INPUT VOLTAGE (V)
CURRENT LIMIT THRESHOLD (mV)
1.65
2.15
2.65
3.15
3.65
4.15
4.65
5.15
INPUT VOLTAGE (V)
Enable Threshold
vs. Input Voltage
700
SHUTDOWN CURRENT (µA)
5.65
60
58
56
54
52
50
48
46
44
42
40
CURRENT LIMIT THRESHOLD (mV)
Current Limit Threshold
vs. Input Voltage
Current Limit Threshold
vs. Temperature
60
ENABLE THRESHOLD (mV)
58
56
54
52
50
48
46
44
42
40
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
800
700
600
500
400
300
200
100
Enable Threshold
vs. Temperature
EN on
EN off
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Shutdown Current
vs. Input Voltage
20
18
16
14
12
10
8
6
4
2
1.65
2.15
2.65
3.15
3.65
4.15
4.65
5.15
5.65
ENABLE THRESHOLD (mV)
EN on
600
500
400
300
200
100
EN off
-40°C
25°C
85°C
1.65
2.15
2.65
3.15
3.65
4.15
4.65
5.15
INPUT VOLTAGE (V)
5.65
0
0
INPUT VOLTAGE (V)
M9999-041204
4
April 2004
MIC5159
Micrel
Functional Characteristics
Load Transient Response
OUTPUT VOLTAGE
(100mV/div.)
OUTPUT VOLTAGE
(100mV/div.)
Enable Characteristics
2A
OUTPUT CURRENT
(1A/div.)
V
IN
= 1.8V
V
OUT
= 1.5V
C
OUT
= 100µF
TIME (20µs/div.)
ENABLE VOLTAGE
(1V/div.)
10mA
V
IN
= 3.3V
V
OUT
= 1.8V
TIME (20µs/div.)
April 2004
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M9999-041204
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