MIC5209
Micrel
MIC5209
500mA Low-Noise LDO Regulator
General Description
The MIC5209 is an efficient linear voltage regulator with very
low dropout voltage, typically 10mV at light loads and less
than 500mV at full load, with better than 1% output voltage
accuracy.
Designed especially for hand-held, battery-powered devices,
the MIC5209 features low ground current to help prolong
battery life. An enable/shutdown pin on SO-8 and TO-263-5
versions can further improve battery life with near-zero shut-
down current.
Key features include reversed-battery protection, current
limiting, overtemperature shutdown, ultra-low-noise capabil-
ity (SO-8 and TO-263-5 versions), and availability in ther-
mally efficient packaging. The MIC5209 is available in adjust-
able or fixed output voltages.
Features
• Meets Intel
®
Slot 1 and Slot 2 requirements
• Guaranteed 500mA output over the full operating
temperature range
• Low 500mV maximum dropout voltage at full load
• Extremely tight load and line regulation
• Thermally-efficient surface-mount package
• Low temperature coefficient
• Current and thermal limiting
• Reversed-battery protection
• No-load stability
• 1% output accuracy
• Ultra-low-noise capability in SO-8 and TO-263-5
Applications
•
•
•
•
•
•
Pentium II Slot 1 and Slot 2 support circuits
Laptop, notebook, and palmtop computers
Cellular telephones
Consumer and personal electronics
SMPS post-regulator/dc-to-dc modules
High-efficiency linear power supplies
For space-critical applications where peak currents do not
exceed 500mA, see the MIC5219.
Typical Applications
MIC5209-2.5BS
Ordering Information
Part Number
MIC5209-2.5BS
MIC5209-3.0BS
MIC5209-3.3BS
Voltage
2.5V
3.0V
3.3V
3.6V
4.2V
5.0V
1.8V
2.5V
3.0V
3.3V
3.6V
5.0V
Adj.
2.5V
3.0V
3.3V
3.6V
5.0V
Adj.
Junct. Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
0°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
SO-8
TO-263-5
TO-263-5
TO-263-5
TO-263-5
TO-263-5
TO-263-5
1
2
3
V
IN
≥
3.0V
0.1µF
V
OUT
2.5V
±1%
22µF
tantalum
MIC5209-3.6BS
MIC5209-4.2BS
MIC5209-5.0BS
MIC5209-1.8BM
MIC5209-2.5BM
MIC5209-3.0BM
MIC5209-3.3BM
MIC5209-3.6BM
3.3V Nominal-Input Slot-1
Power Supply
ENABLE
SHUTDOWN
MIC5209-5.0BM
1
2
3
4
8
7
6
5
V
IN
6V
V
OUT
5V
2.2µF
tantalum
MIC5209-5.0BM
MIC5209BM
MIC5209-2.5BU
MIC5209-3.0BU
MIC5209-3.3BU
MIC5209-3.6BU
MIC5209-5.0BU
MIC5209BU
470pF
(OPTIONAL)
Ultra-Low-Noise 5V Regulator
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
August 2, 2000
1
MIC5209
MIC5209
Micrel
Pin Configuration
GND
TAB
1
2
3
IN
GND OUT
EN 1
IN 2
OUT 3
BYP 4
8
7
6
5
GND
GND
GND
GND
MIC5209-x.xBS
SOT-223
Fixed Voltages
GND
TAB
5
4
3
2
1
BYP
OUT
GND
IN
EN
MIC5209-x.xBM
SO-8
Fixed Voltages
EN 1
IN 2
OUT 3
ADJ 4
8
7
6
5
GND
GND
TAB
MIC5209-x.xBU
TO-263-5
Fixed Voltages
GND
GND
GND
5
4
3
2
1
ADJ
OUT
GND
IN
EN
MIC5209BM
SO-8
Adjustable Voltage
MIC5209BU
TO-263-5
Adjustable Voltage
Pin Description
Pin No.
SOT-223
1
2,
TAB
3
Pin No.
SO-8
2
5–8
3
1
4 (fixed)
Pin No.
TO-263-5
2
3
4
1
5 (fixed)
Pin Name
IN
GND
OUT
EN
BYP
Pin Function
Supply Input
Ground: SOT-223 pin 2 and
TAB
are internally connected. SO-8 pins 5
through 8 are internally connected.
Regulator Output
Enable (Input): CMOS compatible control input. Logic high = enable; logic
low or open = shutdown.
Reference Bypass: Connect external 470pF capacitor to GND to reduce
output noise. May be left open. For 1.8V or 2.5V operation, see “Applica-
tions Information.”
Adjust (Input): Feedback input. Connect to resistive voltage-divider network.
4 (adj.)
5 (adj.)
ADJ
MIC5209
2
August 2, 2000
MIC5209
Micrel
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage (V
IN
) ............................ –20V to +20V
Power Dissipation (P
D
) ............... Internally Limited,
Note 3
Junction Temperature (T
J
)
all except 1.8V ...................................... –40°C to +125°C
1.8V only .................................................. 0°C to +125°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Storage Temperature (T
S
) ....................... –65°C to +150°C
Operating Ratings
(Note 2)
Supply Input Voltage (V
IN
) ........................... +2.5V to +16V
Enable Input Voltage (V
EN
) .................................. 0V to V
IN
Junction Temperature (T
J
)
all except 1.8V ...................................... –40°C to +125°C
1.8V only .................................................. 0°C to +125°C
Package Thermal Resistance ..................................
Note 3
Electrical Characteristics
V
IN
= V
OUT
+ 1.0V; C
OUT
= 4.7µF, I
OUT
= 100µA; T
J
= 25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C except
0°C
≤
T
J
≤
+125°C for 1.8V version; unless noted.
Symbol
V
OUT
∆V
OUT
/∆T
∆V
OUT
/V
OUT
∆V
OUT
/V
OUT
V
IN
– V
OUT
Parameter
Output Voltage Accuracy
Output Voltage
Temperature Coefficient
Line Regulation
Load Regulation
Dropout Voltage,
Note 6
Conditions
variation from nominal V
OUT
Note 4
V
IN
= V
OUT
+ 1V to 16V
I
OUT
= 100µA to 500mA,
Note 5
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 150mA
I
OUT
= 500mA
I
GND
Ground Pin Current,
Notes 7, 8
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
OUT
/∆P
D
e
no
Ground Pin Quiescent Current,
Note 8
Ripple Rejection
Current Limit
Thermal Regulation
Output Noise
Note 10
V
EN
≤
0.4V (shutdown)
V
EN
≤
0.18V (shutdown)
f = 120Hz
V
OUT
= 0V
Note 9
V
OUT
= 2.5V, I
OUT
= 50mA,
C
OUT
= 2.2µF, C
BYP
= 0
I
OUT
= 50mA, C
OUT
= 2.2µF, C
BYP
= 470pF
Min
–1
–2
40
0.009
0.05
10
115
165
350
80
350
1.8
8
0.05
0.10
75
700
0.05
500
300
900
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
Typical
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
mA
%/W
nV/ Hz
nV/ Hz
August 2, 2000
3
MIC5209
MIC5209
ENABLE Input
V
ENL
Enable Input Logic-Low Voltage
V
EN
= logic low (regulator shutdown)
V
EN
= logic high (regulator enabled)
I
ENL
I
ENH
Note 1.
Note 2.
Note 3:
Micrel
0.4
0.18
2.0
0.01
0.01
5
–1
–2
20
25
V
V
V
µA
µA
µA
µA
Enable Input Current
V
ENL
≤
0.4V
V
ENL
≤
0.18V
V
ENH
≥
2.0V
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
The maximum allowable power dissipation at any T
A
(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.
Output voltage temperature coefficient is 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 100µA to 500mA. 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.
V
EN
is the voltage externally applied to devices with the EN (enable) input pin. [SO-8 (M) and TO-263-5 (U) packages only.]
Thermal regulation is 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
= 16V for t = 10ms.
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
C
BYP
is an optional, external bypass capacitor connected to devices with a BYP (bypass) or ADJ (adjust) pin. [SO-8 (M) and TO-263-5 (U)
packages only].
MIC5209
4
August 2, 2000
MIC5209
Micrel
Block Diagrams
IN
OUT
V
OUT
C
OUT
V
IN
Bandgap
Ref.
Current Limit
Thermal Shutdown
MIC5209-x.xBS
GND
Low-Noise Fixed Regulator (SOT-223 version only)
V
IN
IN
BYP
OUT
V
OUT
C
OUT
C
BYP
(optional)
Bandgap
Ref.
V
REF
EN
Current Limit
Thermal Shutdown
MIC5209-x.xBM/U
GND
Ultra-Low-Noise Fixed Regulator
V
IN
IN
OUT
V
OUT
C
OUT
ADJ
Bandgap
Ref.
V
REF
EN
Current Limit
Thermal Shutdown
MIC5209BM/U [adj.]
GND
R1
R2
C
BYP
(optional)
Ultra-Low-Noise Adjustable Regulator
August 2, 2000
5
MIC5209
嵌入式系统
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