MICREL MIC5201

MIC5201
Micrel
MIC5201
200mA Low-Dropout Voltage Regulator
General Description
Features
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 VIN 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.
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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
Applications
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Cellular telephones
Laptop, notebook, and palmtop computers
Battery powered equipment
PCMCIA VCC and VPP regulation/switching
Bar code scanners
SMPS post-regulator/ dc-to-dc modules
High-efficiency linear power supplies
Ordering Information
Part Number
Voltage
Junction Temp. Range*
Package
MIC5201BM
Adj
–40°C to +125°C
SO-8
MIC5201-3.0BM
3.0
–40°C to +125°C
SO-8
MIC5201-3.3BM
3.3
–40°C to +125°C
SO-8
MIC5201-5.0BM
5.0
–40°C to +125°C
SO-8
MIC5201-3.0BS
3.0
–40°C to +125°C
SOT-223
MIC5201-3.3BS
3.3
–40°C to +125°C
SOT-223
MIC5201-4.8BS
4.85
–40°C to +125°C
SOT-223
MIC5201-5.0BS
5.0
–40°C to +125°C
SOT-223
Other voltages available. Contact Micrel for details.
* Junction Temperature.
Typical Application
ENABLE
SHUTDOWN
MIC5201-3.3
IN
VOUT
3.3V
OUT
EN
GND
1µF
MM8 is a trademark of Micrel, Inc.
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
July 1998
1
MIC5201
MIC5201
Micrel
Pin Configuration
GND
TAB
1
IN
OUT
1
8
IN
ADJ
2
7
NC
GND
3
6
NC
NC
4
5
EN
2
3
GND OUT
MIC5201-x.xBS
SOT-223
Fixed
OUT
1
8
IN
NC
2
7
NC
GND
3
6
NC
NC
4
5
EN
MIC5201-x.xBM
8-Lead SOIC
Fixed
MIC5201BM
8-Lead SOIC
Adjustable
Pin Description
Pin No.
SOT-223
3
Pin No.
Pin No.
SO-8 Adj. SO-8 Fixed
1
Pin Name
1
2
2
1
Pin Function
OUT
Regulated Output
ADJ
Feedback Input: (Adjustable version only)
not internally connected: Connect to ground plane for lowest thermal
resistance.
4, 6, 7
2, 4, 6, 7
NC
3
3
GND
5
5
EN
Enable (Input): TTL compatible input. High = enable.
Low or open = off/disable.
8
8
VIN
Unregulated Supply Input
Ground
Absolute Maximum Ratings
Operating Ratings
Supply Input Voltage (VIN) Fixed .................. –20V to +60V
Supply Input Voltage (VIN) Adjustable .......... –20V to +20V
Enable Input Voltage (VEN) Fixed ................. –20V to +60V
Enable Input Voltage (VEN) Adjustable ......... –20V to +20V
Power Dissipation (PD) ............................ Internally Limited
Junction Temperature (TJ) ....................... –40°C to +125°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Supply Input Voltage (VIN) Fixed ................... 2.5V to +26V
Supply Input Voltage (VIN) Adjustable ........... 2.5V to +16V
Enable Input Voltage (VEN) .................................. 0V to VIN
Junction Temperature (TJ) ....................... –40°C to +125°C
MIC5201
2
July 1998
MIC5201
Micrel
Electrical Characteristics
VIN = VOUT + 1V; IL = 100µA; CL = 3.3µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol
Parameter
Condition
Min
VO
Output Voltage Accuracy
Variation from specified VOUT
∆VO/∆T
Output Voltage Temperature Coef.
Note 2
∆VO/VO
Line Regulation, Fixed
∆VO/VO
Typ
Max
Units
1
2
%
%
40
150
ppm/°C
VIN = VOUT + 1V to 26V
0.004
0.20
0.40
%
%
Line Regulation, Adjustable
VIN = VOUT + 1V to 16V
0.004
0.20
0.40
%
%
∆VO/VO
Load Regulation
IL = 0.1mA to 200mA, Note 3
0.04
0.16
0.30
%
%
VIN – VO
Dropout Voltage, Note 4
IL = 100µA
IL = 20mA
IL = 50mA
IL = 100mA
IL = 200mA
17
130
180
225
270
400
mV
mV
mV
mV
mV
–1
–2
IGND
Quiescent Current
VENABLE ≤ 0.7V (shutdown)
0.01
IGND
Ground Pin Current
IL = 100µA
IL = 20mA
IL = 50mA
IL = 100mA
IL = 200mA
130
270
500
1000
3000
µA
400
2000
75
µA
µA
µA
µA
µA
PSRR
Ripple Rejection
dB
IGNDDO
Ground Pin Current at Dropout
VIN = 0.5V less than specified VOUT,
IL = 100µA, Note 5
270
330
µA
ILIMIT
Current Limit
VOUT = 0V
280
500
mA
∆VO/∆PD
Thermal Regulation
Note 6
0.05
%/W
en
Output Noise
100
µV
Enable Input
VIL
Input Voltage Level
logic low (off)
0.7
V
VIH
Input Voltage Level
logic high (on)
IIL
Enable Input Current
VIL ≤ 0.7V
0.01
1
µA
IIH
Enable Input Current
VIH ≤ 2.0V
15
50
µA
1.242
1.255
1.267
V
V
2.0
V
Reference (MIC5201 Adjustable Version Only)
VREF
Reference Voltage
IIL
Reference Voltage Temp. Coef.
1.223
1.217
20
ppm/°C
General Note: Devices are ESD sensitive. Handling precautions recommended.
Note 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 rated operating conditions. The maximum allowable power dissipation is a function of the maximum junction
temperature, TJ(max), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power
dissipation at any ambient temperature is calculated using: P(max) = (TJ(max) – TA) ÷ θJA. Exceeding the maximum allowable power dissipation
will result in excessive die temperature, and the regulator will go into thermal shutdown. The θJC of the MIC5201-x.xBS is 15°C/W and θJA for
the MIC5201BM is 160°C/W mounted on a PC board (see “Thermal Considerations” section for further details).
Note 2:
Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
Note 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 200mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 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.
Note 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.
Note 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 200mA load pulse at VIN = 26V for fixed and VIN = 16V for adjustable at t = 10ms.
July 1998
3
MIC5201
MIC5201
Micrel
Block Diagrams
VIN
OUT
IN
VOUT
COUT
Bandgap
Ref.
Current Limit
Thermal Shutdown
MIC5201-x.xBS
GND
Fixed Regulator (SOT-223 version only)
VIN
OUT
IN
VOUT
COUT
Bandgap
Ref.
V
REF
EN
Current Limit
Thermal Shutdown
MIC5201-x.xBM
GND
Fixed Regulator
VIN
OUT
IN
VOUT
COUT
ADJ
R1
R2
Bandgap
Ref.
V
REF
EN
Current Limit
Thermal Shutdown
MIC5201BM [adj.]
GND
Adjustable Regulator
MIC5201
4
July 1998
MIC5201
Micrel
Typical Characteristics
Dropout Voltage
vs. Output Current
Dropout Voltage
vs. Temperature
50
0
0.01
IL = 100mA
0.2
0.1
IL = 1mA
0.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
0.1
1
10
100 1000
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
0.1
0.01
0.8
0.6
0.0
0.1
1
10
100
OUTPUT CURRENT (mA)
IL = 100mA
IL = 1mA
0.2
0
Ground Current
vs. Temperature
0.15
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
3.4
3.3
3.2
3.1
3 DEVICES:
HI / AVG / LO
CURVES APPLICABLE
AT 100µA AND 100mA
3.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
July 1998
0
∆ OUTPUT (mV)
1.3
ILOAD = 100mA
CIN = 2.2µF
COUT = 4.7µF
1.2
1.1
0
50
100
TEMPERATURE (°C)
260
VOUT = 3.3V
200
180
160
140
VOUT = 0V
(SHORT CIRCUIT)
120
100
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
5
10
CIN = 2.2µF
COUT = 4.7µF
2.5
2.0
1.5
1.0
0.5
0.1
0.2
OUTPUT CURRENT (A)
0.3
100
50
0
CL = 4.7 µF
200
-50
100
0
-100
-5
150
300
280
240
220
2
4
6
8
INPUT VOLTAGE (V)
3.0
Output Current
vs. Temperature
Output Voltage vs. Temp.
(3.3V Version)
CIN = 2.2µF
COUT = 4.7µF
1.4
1.0
-50
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V)
3.5
IL = 100µA, 1mA
0.5
Thermal Regulation
(3.3V Version)
LOAD (mA)
GROUND CURRENT (mA)
GROUND CURRENT (mA)
0.20
1.0
0.0
0.0
10
1.5
ILOAD = 100µA
CIN = 2.2µF
COUT = 4.7µF
1.5
Ground Current
vs. Temperature
0.30
3.6
2
4
6
8
SUPPLY VOLTAGE (V)
2.0
3.5
1.2
0.4
IL = 100mA
2.5
Output Voltage
vs. Output Current
1.4
1.0
3.0
0.0
Ground Current
vs. Supply Voltage
1.6
GROUND CURRENT (mA)
GROUND CURRENT (mA)
10
1
OUTPUT VOLTAGE (V)
100
0.3
OUTPUT VOLTAGE (V)
150
3.5
0
5
10 15 20 25 30 35
TIME (ms)
Minimum Input Voltage
vs. Temperature
MIN. INPUT VOLTAGE (V)
200
0.25
Dropout
Characteristics
0.4
DROPOUT VOLTAGE (V)
DROPOUT VOLTAGE (mV)
250
3.30
3.29
3.28
3.27
3.26
CIN = 2.2µF
COUT = 4.7µF
ILOAD = 1mA
3.25
3.24
3.23
3.22
3.21
3.20
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
MIC5201
MIC5201
Micrel
Load Transient
150
CIN = 2.2µF
COUT = 4.7µF
VOUT = 3.3V
100
50
1
2
3
4
5
6
INPUT VOLTAGE (V)
CL = 4.7µF
-20
-30
300
200
100
0
-2
7
0
Supply Current vs. Supply
Voltage (3.3V Version)
∆ OUTPUT (mV)
100
80
RL = 33Ω
20
0
0
6
4
10
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
5
4
3
2
1
0
4
-1
0
ENABLE CURRENT (µA)
10
IL = 1mA
0.1
0.01
1x106
100x103
10x103
100x100
10x100
1x100
IL = 100mA
30
25
0
6
4
0
5
4
3
2
1
0
4
-1
0.1 0.2 0.3 0.4 0.5 0.6
TIME (ms)
CL = 4.7 µF
IL = 100mA
2
0
-2
-50
50 100 150 200 250 300
TIME (µs)
0
50 100 150 200 250 300
TIME (µs)
Enable Voltage Threshold
vs. Temperature
1.6
CIN = 2.2µF
COUT = 4.7µF
20
15
VEN = 5V
10
5
0
40
8
-5
Enable Current Threshold
vs. Temperature
IL = 100µA
1x103
OUTPUT IMPEDANCE (Ω)
0
30
Enable Transient
(3.3V Version)
35
1
5
2
-0.1
0.8
2
Output Impedance
0.001
0.6
CL = 4.7 µF
IL = 1mA
-2
-50
7
1000
100
0.2
0.4
TIME (ms)
ENABLE (V)
OUTPUT (V)
ENABLE (V)
SUPPLY CURRENT (mA)
30
RL = 66Ω
0
10
20
TIME (ms)
CL = 10 µF
IL = 1mA
10
Enable Transient
(3.3V Version)
60
20
0
Line Transient
-5
Supply Current vs. Supply
Voltage (3.3V Version)
40
0
-10
15
CL = 1 µF
IL = 1mA
5
2
-0.2
0 1 2 3 4 5 6 7 8 9 10
SUPPLY VOLTAGE (V)
50
100
10
8
-10
40
200
INPUT (V)
60
8
CL = 47µF
Line Transient
10
INPUT (V)
SUPPLY CURRENT (mA)
120
2
4
6
TIME (ms)
0
-10
-20
-30
300
VEN = 2V
-5
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
ENABLE VOLTAGE (V)
0
0
-10
∆ OUTPUT (mV)
200
20
10
OUTPUT (V)
250
Load Transient
20
10
OUTPUT (mA) ∆ OUTPUT (mV)
OUTPUT (mA) ∆ OUTPUT (mV)
SHORT CIRCUIT CURRENT (mA)
Short Circuit Current
vs. Input Voltage
300
1.4
1.2
CIN = 2.2µF
COUT = 4.7µF
1
0.8
ON
OFF
0.6
0.4
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
FREQUENCY (Hz)
MIC5201
6
July 1998
MIC5201
Micrel
Ripple
vs. Frequency
FREQUENCY (Hz)
July 1998
FREQUENCY (Hz)
7
40
1x106
0
100x103
20
10x103
0
1x106
20
IL = 100mA
60
1x103
40
80
100x100
RIPPLE VOLTAGE (dB)
60
100x103
1x106
100x103
10x103
10x100
0
1x103
20
IL = 1mA
10x103
40
80
1x103
60
100
100x100
IL = 100µA
10x100
80
RIPPLE VOLTAGE (dB)
100
100x100
RIPPLE VOLTAGE (dB)
100
Ripple
vs. Frequency
10x100
Ripple
vs. Frequency
FREQUENCY (Hz)
MIC5201
MIC5201
Micrel
Applications Information
IN
Figure 1 shows a basic fixed-voltage application with the
unused enable input connected to VIN.
MIC5201-x.xBM
MIC5201-x.xBS
VIN
IN
EN
R1
3.3µF
CADJ
VOUT
Figure 3. Decreasing Ouput Noise
1µF
Minimum Load
The MIC5201 will remain stable and in regulation with no load
unlike many other voltage regulators. This is especially
important in CMOS RAM keep-alive applications.
Figure 1. Fixed Application
Adjustable regulators require two resistors to set the output
voltage. See Figure 2.
MIC5201BM
EN
ADJ
GND
OUT
GND
IN
VOUT
OUT
R2
EN
VIN
MIC5201BM
VIN
Dual-Supply Systems
When used in dual supply systems where the regulator load
is returned to a negative supply, the output voltage must be
diode clamped to ground.Thermal Considerations
VOUT
OUT
ADJ
GND
R1
3.3µF
R2
Layout
 R2 
VOUT = 1.242V 1 +

 R1
The MIC5201-x.xBM (8-pin surface mount package) has the
following thermal characteristics when mounted on a single
layer copper-clad printed circuit board.
Figure 2. Adjustable Application
Resistors values are not critical because ADJ (adjust) has a
high impedance, but for best results use resistors of 470kΩ
or less.
PC Board
Dielectric
FR4
Ceramic
Output Capacitors
θJA
160° C/W
120° C/W
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
A 1µF capacitor is recommended between the MIC5201
output and ground to prevent oscillations due to instability.
Larger values serve to improve the regulator’s transient
response. Most types of tantalum or aluminum electrolytics
will be adequate; film types will work, but are costly and
therefore not recommended. Many aluminum electrolytics
have electrolytes that freeze at about –30°C, so solid tantalums are recommended for operation below –25°C. The
important parameters of the capacitor are an effective series
resistance of about 5Ω or less and a resonant frequency
above 500kHz. The value of this capacitor may be increased
without limit.
The “worst case” value of 160°C/W assumes no ground
plane, minimum trace widths, and a FR4 material board.
Nominal Power Dissipation and Die Temperature
The MIC5201-x.xBM at a 25°C ambient temperature will
operate reliably at up to 625mW power dissipation when
mounted in the “worst case” manner described above. At an
ambient temperature of 55°C, the device may safely dissipate 440mW. These power levels are equivalent to a die
temperature of 125°C, the recommended maximum temperature for non-military grade silicon integrated circuits.
At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to
0.47µF for current below 10mA or 0.33µF for currents below
1mA.
For MIC5201-x.xBS (SOT-223 package) heat sink characteristics, please refer to Micrel Application Hint 17, P.C. Board
Heat Sinking.
Input Capacitors
A 1µF capacitor should be placed from the MIC5201 input to
ground if there is more than 10 inches of wire between the
input and the ac filter capacitor or if a battery is used as the
input.
50 mil
Noise Reduction Capacitors
On adjustable devices, a capacitor from ADJ to GND will
decrease high-frequency noise on the output. See Figure 3.
245 mil
150 mil
30 mil
50 mil
Figure 4. Min. Recommended SO-8 PCB Pads Size
MIC5201
8
July 1998
MIC5201
Micrel
Package Information
0.026 (0.65)
MAX)
PIN 1
0.157 (3.99)
0.150 (3.81)
DIMENSIONS:
INCHES (MM)
0.020 (0.51)
0.013 (0.33)
0.050 (1.27)
TYP
0.064 (1.63)
0.045 (1.14)
0.0098 (0.249)
0.0040 (0.102)
0°–8°
0.197 (5.0)
0.189 (4.8)
SEATING
PLANE
45°
0.010 (0.25)
0.007 (0.18)
0.050 (1.27)
0.016 (0.40)
0.244 (6.20)
0.228 (5.79)
8-Pin SOIC (M)
3.15 (0.124)
2.90 (0.114)
CL
3.71 (0.146) 7.49 (0.295)
3.30 (0.130) 6.71 (0.264)
CL
2.41 (0.095)
2.21 (0.087)
1.04 (0.041)
0.85 (0.033)
4.7 (0.185)
4.5 (0.177)
0.10 (0.004)
0.02 (0.0008)
DIMENSIONS:
MM (INCH)
6.70 (0.264)
6.30 (0.248)
1.70 (0.067)
16°
1.52 (0.060)
10°
10°
MAX
0.038 (0.015)
0.25 (0.010)
0.84 (0.033)
0.64 (0.025)
0.91 (0.036) MIN
SOT-223 (S)
July 1998
9
MIC5201
MIC5201
MIC5201
Micrel
10
July 1998
MIC5201
July 1998
Micrel
11
MIC5201
MIC5201
Micrel
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
USA
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 1998 Micrel Incorporated
MIC5201
12
July 1998