MIC5210
Dual 150mA LDO Regulator
General Description
The MIC5210 is a dual linear voltage regulator with very
low dropout voltage (typically 10mV at light loads and
140mV at 100mA), very low ground current (225µA at
10mA output), and better than 1% initial accuracy. It also
features individual logic-compatible enable/shutdown
control inputs.
Both regulator outputs can supply up to 150mA at the
same time as long as each regulator’s maximum junction
temperature is not exceeded.
Key features include an undervoltage monitor with an error
flag output, a reference bypass pin to improve its already
low-noise performance (8-pin versions only), reversed-
battery protection, current limiting, and overtemperature
shutdown.
Designed especially for hand-held battery powered
devices, the MIC5210 can be switched by a CMOS or TTL
compatible logic signal, or the enable pin can be
connected to the supply input for 3-terminal operation.
When disabled, power consumption drops nearly to zero.
Dropout ground current is minimized to prolong battery life.
Key features include current limiting, overtemperature
shutdown, and protection against reversed battery.
The MIC5210 is available in 2.7V, 2.8V, 3.0V, 3.3V, 3.6V,
4.0V and 5.0V fixed voltage configurations. Other voltages
are available; contact Micrel for details.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
Micrel Mini 8™ MSOP package
Up to 150mA per regulator output
Low quiescent current
Low dropout voltage
Wide selection of output voltages
Tight load and line regulation
Low temperature coefficient
Current and thermal limiting
Reversed input polarity protection
Zero off-mode current
Logic-controlled electronic enable
Applications
•
•
•
•
•
•
Cellular telephones
Laptop, notebook, and palmtop computers
Battery-powered equipment
Bar code scanners
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
Typical Application
Low-Noise + Ultralow-Noise (Dual) Regulator
MM8 and Micrel Mini 8 are trademarks 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
M9999-090806
Micrel, Inc.
MIC5210
Absolute Maximum Ratings
Supply Input Voltage (V
IN
).............................. –20V to +20V
Enable Input Voltage (V
EN
)............................. –20V to +20V
Power Dissipation (P
D
) ..............................Internally Limited
Storage Temperature Range ....................–60°C to +150°C
Lead Temperature (soldering, 5 sec.)........................ 260°C
Operating Ratings
Supply Input Voltage (V
IN
)................................. 2.5V to 16V
Enable Input Voltage (V
EN
)................................... 0V to 16V
Junction Temperature (T
J
) .......................... –40°C to +85°C
Thermal Resistance (θ
JA
)..........................................
Note 1
Electrical Characteristics
V
IN
= V
OUT
+1V; I
L
= 100µA; C
L
= 1.0µF; V
EN
≥
2.0V; T
J
= 25°C,
bold
values indicate –40°C < T
J
< +125°C, unless noted.
Symbol
V
O
∆V
O
/∆T
∆V
O
/V
O
∆V
O
/V
O
V
IN
– V
O
Parameter
Output Voltage Accuracy
Output Voltage Temperature
Coefficient
Line Regulation
Load Regulation
Dropout Voltage,
Note 4
Condition
Variation from specified V
OUT
Note 2
V
IN
= V
OUT
+1V to 16V
I
L
= 0.1mA to 150mA (Note
3)
I
L
= 100µA
I
L
= 50mA
I
L
= 100mA
I
L
= 150mA
I
GND
I
GND
Quiescent Current
Ground Pin Current,
Note 5
(per regulator)
V
EN
≤
0.4V (shutdown)
V
EN
≤
0.18V (shutdown)
V
EN
≥
2.0V, I
L
= 100µA
I
L
= 50mA
I
L
= 100mA
I
L
= 150mA
PSRR
I
LIMIT
∆V
O
/∆P
D
e
no
Ripple Rejection
Current Limit
Thermal Regulation
Output Noise (Regulator B only)
Frequency = 100Hz, I
L
= 100µA
V
OUT
= 0V
Note 6
I
L
= 50mA, C
L
= 2.2µF,
470pF from BYPB to GND
Min
–1
–2
40
0.004
0.02
10
110
140
165
0.01
80
350
600
1300
75
320
0.05
260
500
0.012
0.05
0.2
0.5
50
70
150
230
250
300
275
350
1
5
125
150
600
800
1000
1500
1900
2500
Typ
Max
1
2
Units
%
%
ppm/°C
%/V
%/V
%
%
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
dB
mA
%/W
nV/√Hz
September 2006
4
M9999-090806
Micrel, Inc.
MIC5210
Symbol
V
IL
V
IH
I
IL
I
IH
Parameter
Enable Input Logic-Low Voltage
Enable Input Logic-High
Voltage
Enable Input Current
Condition
Regulator shutdown
Regulator enabled
V
IL
≤
0.4V
V
IL
≤
0.18V
V
IH
≥
2.0V
V
IH
≥
2.0V
Min
Typ
Max
0.4
0.18
Units
V
V
V
Enable Input
2.0
0.01
5
–1
–2
20
25
µA
µA
µA
µA
Notes:
1. 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 operating ratings. 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
D(max)
= (T
J(max)
– T
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
JA
of the 8-pin MSOP (MM) is 200°C/W mounted on a PC board (see “Thermal Considerations” section
for further details).
2. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
3. 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.
4. 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.
5. 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.
6. 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 150mA load pulse at V
IN
= 16V for t = 10ms.
September 2006
5
M9999-090806
51单片机
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