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MIC5256
150mA µCap LDO with Error Flag
General Description
The MIC5256 is an efficient, precise CMOS voltage
regulator. It offers better than 1% initial accuracy,
extremely low-dropout voltage (typically 135mV at 150mA)
and low ground current (typically 90µA) over load. The
MIC5256 features an error flag that indicates an output
fault condition such as overcurrent, thermal shutdown and
dropout.
Designed specifically for handheld and battery-powered
devices, the MIC5256 provides a TTL-logic-compatible
enable pin. When disabled, power consumption drops
nearly to zero.
The MIC5256 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, faster
transient response, and an active clamp to speed up
®
device turnoff. Available in the IttyBitty SOT-23-5
package and the new Thin SOT-23-5, which offers the
same footprint as the standard IttyBitty
®
SOT-23-5, but
only 1mm tall. The MIC5256 offers a range of output
voltages.
Data sheets and support documentation can be found on
Micrel’s web site at
www.micrel.com.
Features
•
•
•
•
•
•
Input voltage range: 2.7V to 6.0V
Thin SOT package: 1mm height
Error flag indicates fault condition
Stable with ceramic output capacitor
Ultralow dropout: 135mV @ 150mA
High output accuracy:
– 1.0% initial accuracy
– 2.0% over temperature
Low quiescent current:90µA
Tight load and line regulation
Thermal-shutdown and current-limit protection
“Zero” off-mode current
TTL logic-controlled enable input
•
•
•
•
•
Applications
•
•
•
•
•
Cellular phones and pagers
Cellular accessories
Battery-powered equipment
Laptop, notebook, and palmtop computers
Consumer/personal electronics
___________________________________________________________________________________________________________
Typical Application
Low-Noise Regulator Application
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 2010
1
M9999-080510
Micrel, Inc.
MIC5256
Ordering Information
Part Number
Standard
MIC5256-1.5BM5
MIC5256-1.8BM5
MIC5256-2.5BM5
MIC5256-2.6BM5
MIC5256-2.7BM5
MIC5256-2.8BM5
MIC5256-2.85BM5
MIC5256-2.9BM5
MIC5256-3.0BM5
MIC5256-3.1BM5
MIC5256-3.3BM5
MIC5256-2.85BD5
Notes:
*
Under bar symbol ( _ ) may not be to scale.
** Other Voltage available. Contact Micrel for details.
Marking
Pb-Free
Standard
LX15
LX18
LX25
LX26
LX27
LX28
LX2J
LX29
LX30
LX31
LX33
NX2J
Pb-Free*
LX15
LX18
LX25
LX26
LX27
LX28
LX2J
LX29
LX30
LX31
LX33
NX2J
Voltage**
1.5V
1.8V
2.5V
2.6V
2.7V
2.8V
2.85V
2.9V
3.0V
3.1V
3.3V
2.85V
Junction Temperature
Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin SOT23
5-Pin TSOT23
MIC5256-1.5YM5
MIC5256-1.8YM5
MIC5256-2.5YM5
MIC5256-2.6YM5
MIC5256-2.7YM5
MIC5256-2.8YM5
MIC5256-2.85YM5
MIC5256-2.9YM5
MIC5256-3.0YM5
MIC5256-3.1YM5
MIC5256-3.3YM5
MIC5256-2.85YD5
Pin Configuration
MIC5256-x.xBM5
5-Pin SOT23
MIC5256-x.xBD5
5-Pin Thin SOT23
MIC5256-x.xYM5
5-Pin SOT23
MIC5256-x.xYD5
5-Pin Thin SOT23
August 2010
2
M9999-080510
Micrel, Inc.
MIC5256
Pin Description
Pin Number
1
2
3
4
5
Pin Name
IN
GND
EN
FLG
OUT
Pin Name
Supply Input.
Ground.
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown. Do not
leave open.
Error Flag (Output): Open-drain output. Active low indicates an output undervoltage condition.
Regulator Output.
August 2010
3
M9999-080510
Micrel, Inc.
MIC5256
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ............................................. 0V to +7V
Enable Voltage (V
EN
)............................................ 0V to +7V
Power Dissipation (P
D
) ........................... Internally Limited
(3)
Junction Temperature (T
J
) ........................–40°C to +125°C
Storage Temperature (T
s
) .........................–60°C to +150°C
Lead Temperature (soldering, 5 sec.)........................ 260°C
EDS Rating
(4)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
)........................................ +2.7V to +6V
Enable Voltage (V
EN
).............................................. 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Thermal Resistance
SOT23-5 (θ
JA
) ..................................................235°C/W
Electrical Characteristics
(5)
V
IN
= V
OUT
+ 1V, V
EN
= V
IN
; I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C; unless noted.
Symbol
V
O
ΔV
LNR
ΔV
LDR
V
IN
–
V
OUT
I
Q
I
GND
Parameter
Output Voltage Accuracy
Line Regulation
Load Regulation
Condition
I
OUT
= 100µA
V
IN
= V
OUT
+ 1V to 6V
I
OUT
= 0.1mA to 150mA
I
OUT
= 100µA
Dropout Voltage
(7)
I
OUT
= 100mA
I
OUT
= 150mA
V
EN
≤
0.4V (shutdown)
I
OUT
= 0mA
I
OUT
= 150mA
f = 10Hz, V
IN
= V
OUT
+ 1V; C
OUT
= 1.0µF
PSRR
Ripple Rejection
f = 100Hz, V
IN
= V
OUT
+ 0.5V; C
OUT
=
1.0µF
f = 10kHz, V
IN
= V
OUT
+ 0.5V
I
LIM
e
n
V
IL
V
IH
I
EN
Current Limit
Output Voltage Noise
Enable Input Logic-Low Voltage
Enable Input Logic-High
Voltage
Enable Input Current
Shutdown Resistance
Discharge
V
IN
= 2.7V to 5.5V, regulator shutdown
V
IN
= 2.7V to 5.5V, regulator enabled
V
IL
≤
0.4V, regulator shutdown
V
IH
≥
1.6V, regulator enabled
1.6
0.01
0.01
500
V
OUT
= 0V
160
(6)
Min.
–1
–2
Typ.
Max.
1
2
Units
%
%
%/V
%
mV
mV
mV
mV
µA
µA
µA
dB
dB
dB
mV
µV(rms)
0.02
1.5
0.1
90
135
0.2
90
117
60
60
45
425
TBD
0.05
2.5
5
150
200
250
1
150
Quiescent Current
Ground Pin Current
(8)
Enable Input
0.4
V
V
µA
µA
Ω
August 2010
4
M9999-080510
嵌入式系统
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