August 2, 2000
1
MIC5209
MIC5209
Micrel
Typical Applications
1
3
2
0.1F
22F
tantalum
V
OUT
2.5V
1%
V
IN
3.0V
MIC5209-2.5BS
3.3V Nominal-Input Slot-1
Power Supply
1
2
3
4
8
7
6
5
MIC5209-5.0BM
2.2F
tantalum
V
OUT
5V
470pF
(OPTIONAL)
V
IN
6V
ENABLE
SHUTDOWN
Ultra-Low-Noise 5V Regulator
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.
For space-critical applications where peak currents do not
exceed 500mA, see the MIC5219.
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
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
Ordering Information
Part Number
Voltage
Junct. Temp. Range
Package
MIC5209-2.5BS
2.5V
40
C to +125
C
SOT-223
MIC5209-3.0BS
3.0V
40
C to +125
C
SOT-223
MIC5209-3.3BS
3.3V
40
C to +125
C
SOT-223
MIC5209-3.6BS
3.6V
40
C to +125
C
SOT-223
MIC5209-4.2BS
4.2V
40
C to +125
C
SOT-223
MIC5209-5.0BS
5.0V
40
C to +125
C
SOT-223
MIC5209-1.8BM
1.8V
0
C to +125
C
SO-8
MIC5209-2.5BM
2.5V
40
C to +125
C
SO-8
MIC5209-3.0BM
3.0V
40
C to +125
C
SO-8
MIC5209-3.3BM
3.3V
40
C to +125
C
SO-8
MIC5209-3.6BM
3.6V
40
C to +125
C
SO-8
MIC5209-5.0BM
5.0V
40
C to +125
C
SO-8
MIC5209BM
Adj.
40
C to +125
C
SO-8
MIC5209-2.5BU
2.5V
40
C to +125
C
TO-263-5
MIC5209-3.0BU
3.0V
40
C to +125
C
TO-263-5
MIC5209-3.3BU
3.3V
40
C to +125
C
TO-263-5
MIC5209-3.6BU
3.6V
40
C to +125
C
TO-263-5
MIC5209-5.0BU
5.0V
40
C to +125
C
TO-263-5
MIC5209BU
Adj.
40
C to +125
C
TO-263-5
MIC5209
Micrel
MIC5209
2
August 2, 2000
1
2
3
4
8
7
6
5
GND
GND
GND
GND
EN
IN
OUT
BYP
MIC5209-x.xBM
SO-8
Fixed Voltages
1
2
3
4
8
7
6
5
GND
GND
GND
GND
EN
IN
OUT
ADJ
MIC5209BM
SO-8
Adjustable Voltage
Pin Description
Pin No.
Pin No.
Pin No.
Pin Name
Pin Function
SOT-223
SO-8
TO-263-5
1
2
2
IN
Supply Input
2,
TAB
58
3
GND
Ground: SOT-223 pin 2 and
TAB
are internally connected. SO-8 pins 5
through 8 are internally connected.
3
3
4
OUT
Regulator Output
1
1
EN
Enable (Input): CMOS compatible control input. Logic high = enable; logic
low or open = shutdown.
4 (fixed)
5 (fixed)
BYP
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."
4 (adj.)
5 (adj.)
ADJ
Adjust (Input): Feedback input. Connect to resistive voltage-divider network.
5 BYP
4 OUT
3 GND
2 IN
1 EN
GND
TAB
MIC5209-x.xBU
TO-263-5
Fixed Voltages
5 ADJ
4 OUT
3 GND
2 IN
1 EN
GND
TAB
MIC5209BU
TO-263-5
Adjustable Voltage
Pin Configuration
IN
OUT
GND
1
3
2
TAB
GND
MIC5209-x.xBS
SOT-223
Fixed Voltages
August 2, 2000
3
MIC5209
MIC5209
Micrel
Electrical Characteristics
V
IN
= V
OUT
+ 1.0V; C
OUT
= 4.7
F, I
OUT
= 100
A; 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
Parameter
Conditions
Min
Typical
Max
Units
V
OUT
Output Voltage Accuracy
variation from nominal V
OUT
1
1
%
2
2
%
V
OUT
/
T
Output Voltage
Note 4
40
ppm/
C
Temperature Coefficient
V
OUT
/V
OUT
Line Regulation
V
IN
= V
OUT
+ 1V to 16V
0.009
0.05
%/V
0.1
%/V
V
OUT
/V
OUT
Load Regulation
I
OUT
= 100
A to 500mA, Note 5
0.05
0.5
%
0.7
%
V
IN
V
OUT
Dropout Voltage, Note 6
I
OUT
= 100
A
10
60
mV
80
mV
I
OUT
= 50mA
115
175
mV
250
mV
I
OUT
= 150mA
165
300
mV
400
mV
I
OUT
= 500mA
350
500
mV
600
mV
I
GND
Ground Pin Current, Notes 7, 8
V
EN
3.0V, I
OUT
= 100
A
80
130
A
170
A
V
EN
3.0V, I
OUT
= 50mA
350
650
A
900
A
V
EN
3.0V, I
OUT
= 150mA
1.8
2.5
mA
3.0
mA
V
EN
3.0V, I
OUT
= 500mA
8
20
mA
25
mA
I
GND
Ground Pin Quiescent Current,
V
EN
0.4V (shutdown)
0.05
3
A
Note 8
V
EN
0.18V (shutdown)
0.10
8
A
PSRR
Ripple Rejection
f = 120Hz
75
dB
I
LIMIT
Current Limit
V
OUT
= 0V
700
900
mA
1000
mA
V
OUT
/
P
D
Thermal Regulation
Note 9
0.05
%/W
e
no
Output Noise
V
OUT
= 2.5V, I
OUT
= 50mA,
500
nV/ Hz
Note 10
C
OUT
= 2.2
F, C
BYP
= 0
I
OUT
= 50mA, C
OUT
= 2.2
F, C
BYP
= 470pF
300
nV/ Hz
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
MIC5209
Micrel
MIC5209
4
August 2, 2000
ENABLE Input
V
ENL
Enable Input Logic-Low Voltage
V
EN
= logic low (regulator shutdown)
0.4
V
0.18
V
V
EN
= logic high (regulator enabled)
2.0
V
I
ENL
Enable Input Current
V
ENL
0.4V
0.01
1
A
V
ENL
0.18V
0.01
2
A
I
ENH
V
ENH
2.0V
5
20
A
25
A
Note 1.
Exceeding the absolute maximum rating may damage the device.
Note 2.
The device is not guaranteed to function outside its operating rating.
Note 3:
The maximum allowable power dissipation at any T
A
(ambient temperature) is calculated using: P
D(max)
= (T
J(max)
T
A
)
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.
Note 4:
Output voltage temperature coefficient is the worst case voltage change divided by the total temperature range.
Note 5:
Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
range from 100
A to 500mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 6:
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.
Note 7:
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.
Note 8:
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.]
Note 9:
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 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].
August 2, 2000
5
MIC5209
MIC5209
Micrel
Block Diagrams
Current Limit
Thermal Shutdown
IN
OUT
GND
Bandgap
Ref.
C
OUT
V
OUT
V
IN
MIC5209-x.xBS
Low-Noise Fixed Regulator (SOT-223 version only)
IN
EN
OUT
BYP
C
BYP
(optional)
GND
V
REF
Bandgap
Ref.
Current Limit
Thermal Shutdown
C
OUT
V
OUT
V
IN
MIC5209-x.xBM/U
Ultra-Low-Noise Fixed Regulator
IN
EN
OUT
C
BYP
(optional)
GND
V
REF
Bandgap
Ref.
Current Limit
Thermal Shutdown
C
OUT
V
OUT
V
IN
R1
R2
MIC5209BM/U [adj.]
ADJ
Ultra-Low-Noise Adjustable Regulator
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