MIC5268
150mA µCap CMOS LDO Regulator
w/Power Good
General Description
The MIC5268 is an efficient, precise CMOS voltage
regulator with power good output. The MIC5268 offers
better than 3% initial accuracy, and constant ground
current (typically 100µA) over load.
The MIC5268 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 MIC5268 is a fixed 1.2V
regulator.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
Power Good indicator
Load independent, ultra-low 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
Ordering Information
Part Number
Standard
MIC5268-1.2BM5
Note:
1. Other Voltage available. Contact Micrel Marketing for details.
Marking
Standard
L512
Pb-Free
L512
Voltage
1.2V
Pb-Free
MIC5268-1.2YM5
Junction
(1)
Temp. Range
–40° to +125°C
Package
5-Pin SOT-23
Typical Application
47k
V
IN
Enable
Shutdown
MIC5268-x.xBM5/YM5
1
5
2
3
4
V
OUT
C
OUT
PG
EN
1.2V Regulator with Power Good
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
September 2006
1
M9999-91506
Micrel, Inc.
MIC5268
Absolute Maximum Ratings
(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
Lead Temperature (soldering, 5sec.)......................... 260°C
Storage Temperature (T
s
) .........................–65°C to +150°C
EDS Rating
(3)
Operating Ratings
(2)
Supply 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
= xx; R
L
=xx; T
A
= 25°C, bold values indicate –40°C< T
A
< +85°C, unless noted.
Symbol
V
O
∆V
LNR
∆V
LNR
I
Q
I
GND
I
LIM
Enable Input
V
IL
V
IH
I
EN
Enable Input Logic-Low Voltage
Enable Input Logic-High Voltage
Enable Input Current
V
IN
= 5.5V, regulator shutdown
V
IN
= 5.5V, regulator enabled
V
IL
≤
0.4V; V
IN
= 5.5V
V
IH
≥
1.6V; V
IN
= 5.5V
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Power Good, Note 6
V
PG
V
OL
I
PG
V
PG
Delay
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. 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.
5. 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.
6. 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.
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Quiescent Current
Ground Pin Current,
Note 5
Current Limit
Condition
I
OUT
= 100µA
V
IN
= 2.7V to 6V
I
OUT
= 0.1mA to 150mA,
Note 4
V
EN
≤
0.4V (shutdown) PG = NC
I
OUT
= 0mA; V
IN
= 6.0V
I
OUT
= 150mA; V
IN
= 6.0V
V
OUT
= 0V
Min
–3
–4
–0.3
Typ
Max
3
4
0.3
Units
%
%
%/V
%
µA
µA
µA
mA
3
0.45
110
110
160
350
5
1
150
150
0.4
1.6
0.01
0.01
150
10
V
V
µA
µA
°C
°C
%
%
mV
µA
ms
Low Threshold
High Threshold
PG Output Logic-Low Voltage
Power Good Leakage Current
Delay time to Power Good
% of V
OUT
(PG ON)
% of V
OUT
(PG OFF)
I
L
= 10mA
power good off, V
PG
= 5.5V
See Timing Diagram
88
97
250
0.01
1
5
500
September 2006
3
M9999-091506
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