MICREL MIC5201

MIC5201
Micrel, Inc.
MIC5201
200mA Low-Dropout 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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Applications
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Ordering Information
Standard
Part Number
PbFree
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
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
Voltage
Junction Temp.*
Package
MIC5201BM
MIC5201YM
Adj.
–40ºC to +125ºC
SO-8
MIC5201-3.0BM
MIC5201-3.0YM
3.0V
–40ºC to +125ºC
SO-8
MIC5201-3.3BM
MIC5201-3.3YM
3.3V
–40ºC to +125ºC
SO-8
MIC5201-5.0BM
MIC5201-5.0YM
5.0V
–40ºC to +125ºC
SO-8
MIC5201-3.0BS
MIC5201-3.0YS
3.0V
–40ºC to +125ºC
SOT-223
MIC5201-3.3BS
MIC5201-3.3YS
3.3V
–40ºC to +125ºC
SOT-223
MIC5201-4.8BS
MIC5201-4.8YS
4.8V
–40ºC to +125ºC
SOT-223
MIC5201-5.0BS
MIC5201-5.0YS
5.0V
–40ºC to +125ºC
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. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2005
1
MIC5201
MIC5201
Micrel, Inc.
Pin Configuration
GND
TAB
1
IN
2
3
GND OUT
MIC5201-x.xBS
SOT-223
Fixed
OUT
1
8
IN
NC
2
7
NC
NC
GND
3
6
NC
EN
NC
4
5
EN
OUT
1
8
IN
ADJ
2
7
NC
GND
3
6
NC
4
5
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
June 2005
MIC5201
Micrel, Inc.
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) – AT) ÷ 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.
June 2005
3
MIC5201
MIC5201
Micrel, Inc.
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
June 2005
MIC5201
Micrel, Inc.
Typical Characteristics
200
0.3
150
OUTPUT VOLTAGE (V)
3.0
DROPOUT VOLTAGE (V)
2.0
0.2
100
1.5
1.0
0.1
50
0
0.01
IL = 1mA
Ground Current
vs. Output Current
10
OUTPUT VOLTAGE (V)
GROUND CURRENT (mA)
2.0
1.5
0.6
1.0
0.4
IL = 1mA
0.2
1.3
∆ OUTPUT (mV)
1.4
ILOAD = 100mA
CIN = 2.2µF
COUT = 4.7µF
1.1
1.0
-50
0.15
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
3.5
CIN = 2.2µF
COUT = 4.7µF
3.4
3.3
3.2
3 DEV IC ES :
HI / AVG / LO
3.1
CURVES APPLICABLE
AT 100µA AND 100mA
3.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
June 2005
300
280
260
240
220
200
180
50
0
100
VOUT = 0V
160
(SHORT CIRCUIT)
140
120
100
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
0
0
5
10 15 20 25 30 35
TIME (ms)
Minimum Input Voltage
vs. Temperature
3.30
3.29
3.27
3.26
3.25
VOUT = 3.3V
CL = 4.7 µF
-50
200
3.28
5
0.3
100
-100
-5
150
Output Current
vs. Temperature
Output Voltage vs. Temp.
(3.3V Version)
OUTPUT CURRENT (mA)
3.6
0
50
100
TEMPERATURE (°C)
0.1
0.2
OUTPUT CURRENT (A)
Thermal Regulation
(3.3V Version)
1.2
0.20
0.0
0.0
10
LOAD (mA)
GROUND CURRENT (mA)
GROUND CURRENT (mA)
0.25
2
4
6
8
SUPPLY VOLTAGE (V)
1.5
0.30
ILOAD = 100µA
CIN = 2.2µF
COUT = 4.7µF
0
0.5
Ground Current
vs. Temperature
Ground Current
vs. Temperature
CIN = 2.2µF
COUT = 4.7µF
2.5
IL = 100mA
0.8
0.0
10
3.0
1.0
0.1
1
10
100
OUTPUT CURRENT (mA)
2
4
6
8
INPUT VOLTAGE (V)
3.5
1.2
1
0
Output Voltage
vs. Output Current
1.4
0.1
0.01
0.0
Ground Current
vs. Supply Voltage
1.6
IL = 100µA, 1mA
0.5
0.0
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
0.1
1
10
100 1000
OUTPUT CURRENT (mA)
IL = 100mA
2.5
IL = 100mA
MIN. INPUT VOLTAGE (V)
DROPOUT VOLTAGE (mV)
3.5
0.4
250
GROUND CURRENT (mA)
Dropout
Characteristics
Dropout Voltage
vs. Temperature
Dropout Voltage
vs. Output Current
CIN = 2.2µF
COUT = 4.7µF
ILOAD = 1mA
3.24
3.23
3.22
3.21
3.20
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
MIC5201
MIC5201
Micrel, Inc.
CIN = 2.2µF
COUT = 4.7µF
VOUT = 3.3V
50
1
2
3
4
5
6
INPUT VOLTAGE (V)
200
100
0
-2
7
Supply Current vs. Supply
Voltage (3.3V Version)
80
RL = 33Ω
20
0
ENABLE (V)
RL = 66Ω
10
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
5
4
3
2
1
0
-1
4
0
ENABLE CURRENT (µA)
30
25
CIN = 2.2µF
COUT = 4.7µF
20
IL = 1mA
1
15
VE N = 5V
10
0.1
0.01
1x106
100x103
10x103
1x103
100x100
10x100
IL = 100mA
5
0
40
VE N = 2V
-5
-60 -30 0 30 60 90 120 150
TEMPERATURE (°C)
0
-5
8
6
4
5
4
3
2
1
0
-1
4
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
35
IL = 100µA
30
Enable Transient
(3.3V Version)
Enable Current Threshold
vs. Temperature
10
1x100
0
10
20
TIME (ms)
CL = 10 µF
IL = 1mA
5
2
-0.1 0
0.8
CL = 4.7 µF
IL = 1mA
-2
-50
7
1000
0.001
0.6
2
Output Impedance
100
0.2
0.4
TIME (ms)
ENABLE (V)
OUTPUT (V)
SUPPLY CURRENT (mA)
30
20
0
Enable Transient
(3.3V Version)
60
OUTPUT IMPEDANCE (Ω)
10
4
2
-0.2
0
Line Transient
6
Supply Current vs. Supply
Voltage (3.3V Version)
40
0
-10
15
-5
0 1 2 3 4 5 6 7 8 9 10
SUPPLY VOLTAGE (V)
50
100
10
CL = 1 µF
IL = 1mA
5
CL = 47µF
200
INPUT (V)
40
0
8
8
-10
60
0
2
4
6
TIME (ms)
0
-10
-20
-30
300
Line Transient
∆ OUTPUT (mV)
100
0
10
INPUT (V)
SUPPLY CURRENT (mA)
120
CL = 4.7µF
-20
300
-30
ENABLE VOLTAGE (V)
0
OUTPUT (mA) ∆ OUTPUT (mV)
150
0
-10
20
10
∆ OUTPUT (mV)
200
20
10
OUTPUT (V)
250
100
Load Transient
Load Transient
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
June 2005
MIC5201
Micrel, Inc.
Ripple
vs. Frequency
FREQUENCY (Hz)
June 2005
FREQUENCY (Hz)
7
40
1x106
0
100x103
20
10x103
1x106
100x103
0
10x103
20
IL = 100mA
60
1x103
40
80
100x100
60
1x103
1x106
100x103
10x103
10x100
0
1x103
20
IL = 1mA
100x100
40
80
10x100
RIPPLE VOLTAGE (dB)
60
100x100
RIPPLE VOLTAGE (dB)
IL = 100µA
100
RIPPLE VOLTAGE (dB)
100
100
80
Ripple
vs. Frequency
10x100
Ripple
vs. Frequency
FREQUENCY (Hz)
MIC5201
MIC5201
Micrel, Inc.
Applications Information
VIN
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
R2
CADJ
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.
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 Layout
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 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
VOUT
EN
VIN
MIC5201BM
VOUT
OUT
ADJ
GND
R1
3.3µF
R2
 R2 
VOUT = 1.242V 1 +

 R1
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
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.
θJA
160ºC/W
120ºC/W
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
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.
Noise Reduction Capacitors
On adjustable devices, a capacitor from ADJ to GND will
decrease high-frequency noise on the output. See Figure 3.
50 mil
245 mil
150 mil
30 mil
50 mil
Figure 4. Min. Recommended SO-8 PCB Pads Size
MIC5201
8
June 2005
MIC5201
Micrel, Inc.
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)
45°
0.0098 (0.249)
0.0040 (0.102)
0°–8°
0.197 (5.0)
0.189 (4.8)
0.010 (0.25)
0.007 (0.18)
0.050 (1.27)
0.016 (0.40)
SEATING
PLANE
0.244 (6.20)
0.228 (5.79)
8-Pin SOP (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)
MICREL INC.
TEL
2180 FORTUNE DRIVE
+ 1 (408) 944-0800
FAX
SAN JOSE, CA 95131 USA
+ 1 (408) 474-1000
WEB
http://www.micrel.com
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 1998 Micrel Incorporated
June 2005
9
MIC5201