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MIC5201
Micrel, Inc.
MIC5201
200mA Low-Dropout Regulator
General Description
The MIC5201 is an efficient linear voltage regulator with very
low dropout voltage (typically 17mV at light loads and 200mV
at 100mA), and very low ground current (1mA at 100mA
output), offering better than 1% initial accuracy with a logic
compatible on-off switching input.
Designed especially for hand-held battery powered devices,
the MIC5201 can be switched by a CMOS or TTL compatible
enable signal. This enable control may be connected directly
to V
IN
if unneeded. When disabled, power consumption
drops nearly to zero. The ground current of the MIC5201
increases only slightly in dropout, further prolonging battery
life. Key MIC5201 features include current limiting,
overtemperature shutdown, and protection against reversed
battery.
The MIC5201 is available in several fixed voltages and
accuracy configurations. It features the same pinout as the
LT1121 with better performance. Other options are available;
contact Micrel for details.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
High output voltage accuracy
Variety of output voltages
Guaranteed 200mA output
Low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Reversed-battery protection
Load-dump protection (fixed voltage versions)
Zero off-mode current
Logic-controlled electronic enable
Available in SO-8 and SOT-223 packages
Cellular telephones
Laptop, notebook, and palmtop computers
Battery powered equipment
PCMCIA V
CC
and V
PP
regulation/switching
Bar code scanners
SMPS post-regulator/ dc-to-dc modules
High-efficiency linear power supplies
Applications
Ordering Information
Standard
MIC5201BM
MIC5201-3.0BM
MIC5201-3.3BM
MIC5201-5.0BM
MIC5201-3.0BS
MIC5201-3.3BS
MIC5201-4.8BS
MIC5201-5.0BS
Part Number
PbFree
MIC5201YM
MIC5201-3.0YM
MIC5201-3.3YM
MIC5201-5.0YM
MIC5201-3.0YS
MIC5201-3.3YS
MIC5201-4.8YS
MIC5201-5.0YS
Voltage
Adj.
3.0V
3.3V
5.0V
3.0V
3.3V
4.8V
5.0V
Junction Temp.*
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
–40ºC to +125ºC
Package
SO-8
SO-8
SO-8
SO-8
SOT-223
SOT-223
SOT-223
SOT-223
Other voltages available. Contact Micrel for details.
* Junction Temperature.
Typical Application
ENABLE
SHUTDOWN
MIC5201-3.3
IN
EN
GND
1µF
OUT
V
OUT
3.3V
MM8 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
June 2005
1
MIC5201
MIC5201
Micrel, Inc.
Pin Configuration
GND
TAB
1
2
3
IN
GND OUT
OUT
ADJ
GND
NC
1
2
3
4
8
7
6
5
IN
NC
NC
EN
MIC5201-x.xBS
SOT-223
Fixed
OUT
NC
GND
NC
1
2
3
4
8
7
6
5
IN
NC
NC
EN
MIC5201BM
8-Lead SOIC
Adjustable
MIC5201-x.xBM
8-Lead SOIC
Fixed
Pin Description
Pin No.
SOT-223
3
Pin No.
Pin No.
SO-8 Adj. SO-8 Fixed
1
2
4, 6, 7
2
3
5
1
8
2, 4, 6, 7
3
5
8
1
Pin Name
OUT
ADJ
NC
GND
EN
V
IN
Pin Function
Regulated Output
Feedback Input: (Adjustable version only)
not internally connected: Connect to ground plane for lowest thermal
resistance.
Ground
Enable (Input): TTL compatible input. High = enable.
Low or open = off/disable.
Unregulated Supply Input
Absolute Maximum Ratings
Supply Input Voltage (V
IN
) Fixed .................. –20V to +60V
Supply Input Voltage (V
IN
) Adjustable .......... –20V to +20V
Enable Input Voltage (V
EN
) Fixed ................. –20V to +60V
Enable Input Voltage (V
EN
) Adjustable ......... –20V to +20V
Power Dissipation (P
D
) ............................ Internally Limited
Junction Temperature (T
J
) ....................... –40°C to +125°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Operating Ratings
Supply Input Voltage (V
IN
) Fixed ................... 2.5V to +26V
Supply Input Voltage (V
IN
) Adjustable ........... 2.5V to +16V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
) ....................... –40°C to +125°C
MIC5201
2
June 2005
MIC5201
Micrel, Inc.
Electrical Characteristics
V
IN
= V
OUT
+ 1V; I
L
= 100µA; C
L
= 3.3µF; V
EN
≥
2.0V; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+85°C; unless noted
Symbol
V
O
∆V
O
/∆T
∆V
O
/V
O
∆V
O
/V
O
∆V
O
/V
O
V
IN
– V
O
Parameter
Output Voltage Accuracy
Output Voltage Temperature Coef.
Line Regulation, Fixed
Line Regulation, Adjustable
Load Regulation
Dropout Voltage,
Note 4
Condition
Variation from specified V
OUT
Note 2
V
IN
= V
OUT
+ 1V to 26V
V
IN
= V
OUT
+ 1V to 16V
I
L
= 0.1mA to 200mA,
Note 3
I
L
= 100µA
I
L
= 20mA
I
L
= 50mA
I
L
= 100mA
I
L
= 200mA
V
ENABLE
≤
0.7V (shutdown)
I
L
= 100µA
I
L
= 20mA
I
L
= 50mA
I
L
= 100mA
I
L
= 200mA
V
IN
= 0.5V less than specified V
OUT
,
I
L
= 100µA,
Note 5
V
OUT
= 0V
Note 6
Min
–1
–2
40
0.004
0.004
0.04
17
130
180
225
270
0.01
130
270
500
1000
3000
75
270
280
0.05
100
330
500
400
2000
Typ
Max
1
2
150
0.20
0.40
0.20
0.40
0.16
0.30
Units
%
%
ppm/°C
%
%
%
%
%
%
mV
mV
mV
mV
mV
µA
µA
µA
µA
µA
µA
dB
µA
mA
%/W
µV
400
I
GND
I
GND
Quiescent Current
Ground Pin Current
PSRR
I
GNDDO
I
LIMIT
∆V
O
/∆P
D
e
n
Enable Input
V
IL
V
IH
I
IL
I
IH
V
REF
I
IL
Note 1:
Ripple Rejection
Ground Pin Current at Dropout
Current Limit
Thermal Regulation
Output Noise
Input Voltage Level
Input Voltage Level
Enable Input Current
Enable Input Current
logic low (off)
logic high (on)
V
IL
≤
0.7V
V
IH
≤
2.0V
1.223
1.217
2.0
0.01
15
0.7
V
V
1
50
µA
µA
Reference (MIC5201 Adjustable Version Only)
Reference Voltage
Reference Voltage Temp. Coef.
1.242
20
1.255
1.267
V
V
ppm/°C
General Note:
Devices are ESD sensitive. Handling precautions recommended.
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when
operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the maximum junction
temperature, T
J(max)
, the junction-to-ambient thermal resistance,
θ
JA
, and the ambient temperature, T
A
. The maximum allowable power
dissipation at any ambient temperature is calculated using: P
(max)
= (T
T
J(max)
–
A
)
÷
θ
JA
. Exceeding the maximum allowable power dissipation
will result in excessive die temperature, and the regulator will go into thermal shutdown. The
θ
JC
of the MIC5201-x.xBS is 15°C/W and
θ
JA
for
the MIC5201BM is 160°C/W mounted on a PC board (see “Thermal Considerations” section for further details).
Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
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 200mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential.
Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of
the load current plus the ground pin current.
Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 200mA load pulse at V
IN
= 26V for fixed and V
IN
= 16V for adjustable at t = 10ms.
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
June 2005
3
MIC5201
MIC5201
Micrel, Inc.
Block Diagrams
V
IN
IN
OUT
V
OUT
C
OUT
Bandgap
Ref.
Current Limit
Thermal Shutdown
MIC5201-x.xBS
GND
Fixed Regulator (SOT-223 version only)
V
IN
IN
OUT
V
OUT
C
OUT
Bandgap
Ref.
V
REF
EN
Current Limit
Thermal Shutdown
MIC5201-x.xBM
GND
Fixed Regulator
V
IN
IN
OUT
V
OUT
C
OUT
ADJ
Bandgap
Ref.
V
REF
EN
Current Limit
Thermal Shutdown
MIC5201BM [adj.]
GND
R1
R2
Adjustable Regulator
MIC5201
4
June 2005
嵌入式系统
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