MIC5216
500mA-Peak Output LDO Regulator
General Description
The MIC5216 is an efficient linear voltage regulator with
high peak output current capability, very low dropout
voltage, and better than 1% output voltage accuracy.
Dropout is typically 10mV at light loads and less than
500mV at full load.
The MIC5216 is designed to provide a peak output current
for startup conditions where higher inrush current is
demanded. It features a 500mA peak output rating.
Continuous output current is limited only by package and
layout.
The MIC5216 has an internal undervoltage monitor with a
flag output. It also can be enabled or shutdown by a
CMOS or TTL compatible signal. When disabled, power
consumption drops nearly to zero. Dropout ground current
is minimized to help prolong battery life. Other key features
include reversed-battery protection, current limiting,
overtemperature shutdown, and low noise performance.
The MIC5216 is available in fixed output voltages in
space-saving SOT-23-5 and MM8™ 8-pin power MSOP
packages. For higher power requirements see the
MIC5209 or MIC5237.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
•
Error Flag indicates undervoltage fault
•
Guaranteed 500mA-peak output over the full operating
temperature range
•
Low 500mV maximum dropout voltage at full load
•
Extremely tight load and line regulation
•
Tiny SOT-23-5 and MM8™ power MSOP-8 package
•
Low-noise output
•
Low temperature coefficient
•
Current and thermal limiting
•
Reversed input polarity protection
•
CMOS/TTL-compatible enable/shutdown control
•
Near-zero shutdown current
Applications
•
•
•
•
•
•
Laptop, notebook, and palmtop computers
Cellular telephones and battery-powered equipment
Consumer and personal electronics
PC Card V
CC
and V
PP
regulation and switching
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
Typical Application
5V Low-Noise Regulator
3.3V Low-Noise 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
March 2007
M9999-032307
Micrel, Inc.
MIC5216
Absolute Maximum Ratings
Supply Input Voltage (V
IN
).............................. –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
)................................. 2.5V to 12V
Enable Input Voltage (V
EN
)..................................... 0V to V
IN
Junction Temperature (T
J
) ........................ –40°C to +125°C
Thermal Resistance (θ
JA
)..........................................
Note 1
Electrical Characteristics
V
IN
= V
OUT
+1V; C
OUT
= 4.7µF; I
OUT
= 100µA; 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 nominal V
OUT
Note 2
V
IN
= V
OUT
+1V to 12V
I
OUT
= 100µA to 150mA (Note
3)
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 150mA
I
OUT
= 500mA
I
GND
Ground Pin Current,
Notes 5, 6
(per regulator)
V
EN
≥
3.0V, I
OUT
= 100µA
V
EN
≥
3.0V, I
OUT
= 50mA
V
EN
≥
3.0V, I
OUT
= 150mA
V
EN
≥
3.0V, I
OUT
= 500mA
I
GND
PSRR
I
LIMIT
∆V
O
/∆P
D
e
no
Quiescent Current,
Note 6
Ripple Rejection
Current Limit
Thermal Regulation
Output Noise
V
EN
≤
0.4V
V
EN
≤
0.18V
Frequency = 120Hz
V
OUT
= 0V
Note 7
I
OUT
= 50mA, C
OUT
= 2.2µF
Min
–1
–2
40
0.009
0.05
10
115
165
300
80
350
1.8
8
0.05
0.10
75
700
0.05
500
1000
0.05
0.1
0.5
0.7
60
80
175
250
300
400
500
600
130
170
650
900
2.5
3.0
20
25
3
8
Typ
Max
1
2
Units
%
%
ppm/°C
%/V
%/V
%
%
mV
mV
mV
mV
mV
mV
mV
mV
µA
µA
µA
µA
mA
mA
mA
mA
µA
µA
dB
mA
%/W
nV/√Hz
March 2007
4
M9999-032307
Micrel, Inc.
MIC5216
Symbol
V
ENL
V
ENH
I
ENL
I
ENH
Parameter
Enable Input Voltage
Condition
V
EN
= logic low (regulator shutdown)
V
EN
= logic high (regulator enabled)
Min
Typ
Max
0.4
0.18
Units
V
V
V
µA
µA
µA
µA
Enable Input
2.0
0.01
0.01
5
–1
–2
20
25
Enable Input Current
V
ENL
≤
0.4V
V
ENL
≤
0.18V
V
ENH
≥
2.0V
Error Flag Output
V
ERR
V
IL
I
FL
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. See Table 1 and the “Thermal Considerations” section for 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
100mA to 500mA. 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. V
EN
is the voltage externally applied to devices with the EN (enable) input pin.
7. 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 500mA load pulse at V
IN
= 12V for t = 10ms.
8. The error flag comparator includes 3% hysteresis.
Flag Threshold
Output Logic-Low Voltage
Flag Leakage Current
Undervoltage condition (below nominal)
Note 8
I
L
= 1mA, undervoltage condition
Flag off, V
FLAG
= 0V to 12V
–2
–6
0.2
–10
0.4
+1
%
V
µA
–1
0.1
March 2007
5
M9999-032307
嵌入式系统
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