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MIC5258
Micrel, Inc.
MIC5258
150mA µCap CMOS LDO Regulator w/Power Good
General Description
The MIC5258 is an efficient, precise CMOS voltage regula-
tor with power good output. The MIC5258 offers better than
3% initial accuracy, and constant ground current (typically
100µA)over load .
The MIC5258 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Key features include current limit, thermal shutdown, a push-
pull output for faster transient response, and an active clamp to
speed up device turnoff. Available in the IttyBitty™ SOT-23-5
package, the MIC5258 is a fixed 1.2V regulator.
Features
•
•
•
•
•
•
•
•
•
•
Power Good indicator
Load independent, ultralow ground current: 100µA
150mA output current
Current limiting
Thermal shutdown
Tight load and line regulation
“Zero” off-mode current
Stability with low-ESR capacitors
Fast transient response
TTL-Logic-controlled enable input
Applications
• Processor power-up sequencing
• Laptop, notebook, and palmtop computers
• PCMCIA V
CC
and V
PP
regulation/switching
Typical Application
Part Number
Standard
MIC5258-1.2BM5
Marking
LN12
Pb-Free
MIC5258-1.2YM5
Marking
KN12
Voltage
1.2V
Junction Temp.
Range*
–40ºC to +125ºC
Package
SOT-23-5
* Other voltages available. Contact Micrel marketing for information.
Typical Application
V
IN
1
2
Enable
Shutdown
47k
MIC5258-x.xBM5
5
V
OUT
C
OUT
3
4
EN
PG
EN (pin 3) may be
connected directly
to IN (pin 1).
Low-Noise Regulator Application
IttyBitty is a 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
April 2006
1
MIC5258
MIC5258
Micrel, Inc.
Pin Configuration
EN
GND
IN
3
2
1
LNxx
KNxx
4
5
PG
OUT
MIC5258-x.xBM5/YM5
Pin Description
Pin Number
1
2
3
4
5
Pin Name
IN
GND
EN
PG
OUT
Pin Function
Supply Input
Ground
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
logic low = shutdown. Do not leave open.
Power Good Output
Regulator Output
MIC5258
2
April 2006
MIC5258
Micrel, Inc.
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage (V
IN
) ....................................0V to +7V
Enable Input Voltage (V
EN
) ...................................0V to V
IN
Flag Output Voltage (V
PG
) .....................................0V to V
IN
Junction Temperature (T
J
) ....................................... +150°C
Storage Temperature ................................ –65°C to +150°C
Lead Temperature (soldering, 5 sec.) ........................ 260°C
ESD,
Note 3
Operating Ratings
(Note 2)
Input Voltage (V
IN
) .......................................... +2.7V to +6V
Enable Input Voltage (V
EN
) ...................................0V to V
IN
Flag Output Voltage (V
PG
) .....................................0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Thermal Resistance
SOT-23(θ
JA
).......................................................235°C/W
Electrical Characteristics
V
IN
= 2.7V, V
EN
= V
IN;
I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C ≤ T
J
≤ +125°C; unless noted.
Symbol
Parameter
Conditions
V
O
ΔV
LNR
ΔV
LDR
I
Q
I
GND
PSRR
I
LIM
V
IL
Enable Input
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
V
IH
I
EN
Output Voltage Accuracy
Line Regulation
Load Regulation
Quiescent Current
Ground Pin Current,
Note 5
Power Supply Rejection
Current Limit
I
OUT
= 100µA
V
IN
= 2.7V to 6V
Min
–3
–4
–0.3
3.5
0.45
110
110
tbd
160
350
0.4
1.6
0.01
0.01
150
10
% of V
OUT
(PG ON)
% of V
OUT
(PG OFF)
89
0.02
0.01
1
5
Typical
Max
3
4
0.3
4
1
150
150
Units
%
%
%/V
%
µA
µA
µA
dB
mA
V
V
µA
µA
°C
°C
%
%
V
µA
ms
I
OUT
= 0mA; V
IN
= 6.0V
V
EN
≤ 0.4V (shutdown) PG = NC
I
OUT
= 150mA; V
IN
= 6.0V
I
OUT
= 0.1mA to 150mA,
Note 4
V
OUT
= 0V
f = 120Hz, C
OUT
= 4.7µF, I
OUT
= 150mA
V
IN
= 5.5V, regulator enabled
V
IL
≤ 0.4V; V
IN
= 5.5V
V
IH
≥ 1.6V; V
IN
= 5.5V
V
IN
= 5.5V, regulator shutdown
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Power Good , Note 6
V
PG
V
OL
I
PG
V
PG
Delay
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Low Threshold
High Threshold
PG Output Logic-Low Voltage
Power Good Leakage Current
Delay time to Power Good
97
0.1
I
L
= 100µA, fault condition
See Timing Diagram
power good off, V
PG
= 5.5V
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended.
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground
pin current.
The power good is a function of the output voltage being 5% low and the detection of one of the following: overcurrent, overtemperature or
dropout. See “Applications Information” section for additional information.
April 2006
3
MIC5258
MIC5258
Micrel, Inc.
Block Diagram
IN
EN
Reference
Voltage
Startup/
Shutdown
Control
Quickstart
PULL
UP
Thermal
Sensor
FAULT
Error
Amplifier
Current
Amplifier
PULL
DOWN
OUT
Under-
voltage
Lockout
ACTIVE SHUTDOWN
Out of
Regulation
Detection
Overcurrent
Dropout
Detection
PG
Delay
GND
Timing Diagram
V
OUT
97%
89%
97%
Fault Condition
V
EN
V
PG
Min - Max
1-5ms
1-5ms
MIC5258
4
April 2006
