MIC5203
μCap 80mA Low-Dropout Regulator
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
General Description
The MIC5203 is a µCap 80mA linear voltage regulator with
very low dropout voltage (typically 20mV at light loads and
300mV at 80mA) and very low ground current (225µA at
20mA output), offering better than 3% initial accuracy with
a logic-compatible enable input.
TheµCap regulator design is optimized to work with low-
value, low-cost ceramic capacitors. The outputs typically
require only 0.47µF of output capacitance for stability.
Designed especially for hand-held, battery-powered
devices, the MIC5203 can be controlled by a CMOS or
TTL compatible logic signal. When disabled, power
consumption drops nearly to zero. If on-off control is not
required, the enable pin may be tied to the input for 3-
terminal operation. The ground current of the MIC5203
increases only slightly in dropout, further prolonging
battery life. Key MIC5203 features include current limiting,
overtemperature shutdown, and protection against
reversed battery.
The MIC5203 is available in 2.8V, 3.0V, 3.3V, 3.6V, 3.8V,
4.0V, 4.5V, 4.75V, and 5.0V fixed voltages. Other voltages
are available.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
• Tiny 4- and 5-lead surface-mount packages
• Wide selection of output voltages
• Guaranteed 80mA output
• Low quiescent current
• Low dropout voltage
• Low temperature coefficient
• Current and thermal limiting
• Reversed input polarity protection
• Zero off-mode current
• Logic-controlled shutdown
• Stability with low-ESR ceramic capacitors
Applications
• Cellular telephones
• Laptop, notebook, and palmtop computers
• Battery-powered equipment
• Barcode scanners
• SMPS post-regulator/DC-to-DC modules
• High-efficiency linear power supplies
_________________________________________________________________________________________________________________________
Typical Application
Enable
Shutdown
LAxx
V
OUT
0.47µF
15
2
34
0.47µF
V
OUT
Enable
Shutdown
SOT-143 Version SOT-23-5 Version
November 2009 M9999-111909
Micrel, Inc. MIC5203
November 2009 2 M9999-111909
Ordering Information(1)
Part Number
Standard Marking Pb-Free Marking
Voltage Temperature Range Package
MIC5203-2.6BM4 LA26 MIC5203-2.6YM4 LA26 2.6V –40° to +125°C SOT-143
MIC5203-2.8BM4 LA28 MIC5203-2.8YM4 LA28 2.8V –40° to +125°C SOT-143
MIC5203-3.0BM4 LA30 MIC5203-3.0YM4 LA30 3.0V –40° to +125°C SOT-143
MIC5203-3.3BM4 LA33 MIC5203-3.3YM4 LA33 3.3V –40° to +125°C SOT-143
MIC5203-3.6BM4 LA36 MIC5203-3.6YM4 LA36 3.6V –40° to +125°C SOT-143
MIC5203-3.8BM4 LA38 MIC5203-3.8YM4 LA38 3.8V –40° to +125°C SOT-143
MIC5203-4.0BM4 LA40 MIC5203-4.0YM4 LA40 4.0V –40° to +125°C SOT-143
MIC5203-4.5BM4 LA45 MIC5203-4.5YM4 LA45 4.5V –40° to +125°C SOT-143
MIC5203-4.7BM4 LA47 MIC5203-4.7YM4 LA47 4.7V –40° to +125°C SOT-143
MIC5203-5.0BM4 LA50 MIC5203-5.0YM4 LA50 5.0V –40° to +125°C SOT-143
MIC5203-2.6BM5 LK26 MIC5203-2.6YM5 LK26 2.6V –40° to +125°C SOT-23-5
MIC5203-2.8BM5 LK28 MIC5203-2.8YM5 LK28 2.8V –40° to +125°C SOT-23-5
MIC5203-3.0BM5 LK30 MIC5203-3.0YM5 LK30 3.0V –40° to +125°C SOT-23-5
MIC5203-3.3BM5 LK33 MIC5203-3.3YM5 LK33 3.3V –40° to +125°C SOT-23-5
MIC5203-3.6BM5 LK36 MIC5203-3.6YM5 LK36 3.6V –40° to +125°C SOT-23-5
MIC5203-3.8BM5 LK38 MIC5203-3.8YM5 LK38 3.8V –40° to +125°C SOT-23-5
MIC5203-4.0BM5 LK40 MIC5203-4.0YM5 LK40 4.0V –40° to +125°C SOT-23-5
MIC5203-4.5BM5 LK45 MIC5203-4.5YM5 LK45 4.5V –40° to +125°C SOT-23-5
MIC5203-4.7BM5 LK47 MIC5203-4.7YM5 LK47 4.7V –40° to +125°C SOT-23-5
MIC5203-5.0BM5 LK50 MIC5203-5.0YM5 LK50 5.0V –40° to +125°C SOT-23-5
Note:
1. Other Voltage available. Contact Micrel for details.
Micrel, Inc. MIC5203
November 2009 3 M9999-111909
Pin Configuration
GND
OUTIN
EN
LAxx
Part
Identification
12
34
IN
OUT
NC
EN
LKxx
13
45
2
GND
SOT-143 (M4) SOT-23-5 (M5)
Pin Description
Pin Number
SOT-143
Pin Number
SOT-23-5 Pin Name Pin Name
1 2 GND Ground.
2 3 EN
Enable (Input): TTL/CMOS compatible control input. Logic high =
enabled; logic low or open = shutdown.
3 1 IN Supply input.
4 NC Not internally connected.
4 5 OUT Regulator output.
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November 2009 4 M9999-111909
Absolute Maximum Ratings(1)
Supply Voltage (VIN)....................................... –20V to +20V
Enable Input Voltage (VEN)............................. –20V to +20V
Power Dissipation (PD)..............................Internally Limited
Storage Temperature (Ts).........................–60°C to +150°C
Lead Temperature (soldering, #sec.)......................... 260°C
Operating Ratings(2)
Input Voltage (VIN)............................................. 2.5V to 16V
Enable Input Voltage (VEN)..................................... 0V to VIN
Junction Temperature Range ................... –40°C to +125°C
Thermal Resistance (θJA) ...........................................Note 3
Electrical Characteristics
VIN = VOUT + 1V; IL = 1mA; CL = 0.47μF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C≤ TJ ≤ +125°C, unless noted.
Symbol Parameter Condition Min Typ Max Units
–3 3
VO Output voltage accuracy –4 4 %
∆VO/∆T Output voltage temperature
coefficient Note 4 50 200
pm/°C
0.008 0.3
∆VO/VO Line regulation VIN = VOUT + 1V to 16V
0.5 %
0.08 0.3
∆VO/VO Load regulation IL = 0.1mA to 80mA(5) 0.5
%
IL = 100 μA 20
IL = 20mA 200 350
IL = 50mA 250
∆VO – VO Dropout voltage(6)
IL = 80mA 300 600
mV
IQ Quiescent current VEN ≤ 0.4V (shutdown) 0.01 10 μA
IL = 100 μA, VEN ≥ 2.0V (active) 180
IL = 20mA, VEN ≥ 2.0V (active) 225 750
IL = 50mA, VEN ≥ 2.0V (active) 850
IGND Ground pin current(7)
IL = 80mA, VEN ≥ 2.0V (active) 1800 3000
μA
IGNDDO Ground pin current at dropout VIN = VOUT(nominal) – 0.5V(7) 200
300 μA
ILIMIT Current limit VOUT = 0V 180 250 mA
∆VO/∆PD Thermal regulation Note 8 0.05 %/W
Micrel, Inc. MIC5203
November 2009 5 M9999-111909
Electrical Characteristics (continued)
VIN = VOUT + 1V; IL = 1mA; CL = 0.47μF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C≤ TJ ≤ +125°C, unless noted.
Symbol Parameter Condition Min Typ Max Units
Enable Input
VIL Logic low (off) 0.6
VIH Enable input voltage level Logic high (on) 2.0 V
IIL V
IL ≤ 0.6V 0.01 1
IIH Enable input current VIH ≥ 2.0V 15 50 μA
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation at any TA (ambient temperature) is PD(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 θJA is 250°C/W for the SOT-143 and 220°C/W
for the SOT-23-5 mounted on a printed circuit board.
4. Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
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
0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
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.
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.
8. 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 150mA load pulse at VIN = 16V for t = 10ms.
Micrel, Inc. MIC5203
November 2009 6 M9999-111909
Typical Characteristics
1
10
100
1000
0.01 0.1 1 10 100
)Vm(EGATLOVTUOPORD
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
C
IN
= 10∝F
C
OUT
= 1∝F
0
100
200
300
400
-60 -30 0 30 60 90 120 150
)Vm(EGATLOVTUOPORD
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
C
IN
= 10∝F
C
OUT
= 1∝F
I
L
= 100∝A
I
L
= 1mA
I
L
= 80mA
0
1
2
3
4
01234567
)V(EGATLOVTUPTUO
SUPPLY VOLTAGE (V)
Dropout
Characteristics
I
L
= 80mA
I
L
= 100∝A
C
IN
= 10∝F
C
OUT
= 1∝F
0
500
1000
1500
2000
0 1020304050607080
(TNERRUCDNUORG
∝
)A
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
V
IN
= V
OUT
+ 1V
0.0
0.5
1.0
1.5
2.0
01234567
)Am(TNERRUCDNUORG
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
I
L
= 50mA
I
L
= 100∝AV
OUT
= 3.3V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-60 -30 0 30 60 90 120 150
)Am(TNERRUCDNUORG
TEMPERATURE (°C)
Ground Current
vs. Temperature
I
L
= 50mA
I
L
= 100∝A
C
IN
= 10∝F
C
OUT
= 1∝F
I
L
= 80mA
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 50 100 150 200
)V(EGATLOVTUPTUO
OUTPUT CURRENT (mA)
C
IN
= 10∝F
C
OUT
= 1∝F
Output Voltage
vs. Output Current
0
20
40
60
80
100
120
140
160
01234567
)Am(TNERRUCTIUCRICTROHS
INPUT VOLTAGE (V)
Short Circuit Current
vs. Input Voltage
C
IN
= 10∝F
C
OUT
= 1∝F
-60
-40
-20
0
20
40
60
)Vm(TUPTUO
-50
0
50
100
-2 0246810121416
)Am(DAOL
TIME (ms)
Thermal Regulation
(3.3V Version)
C
L
= 1∝F
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
-60 -30 0 30 60 90 120 150
)V(EGATLOVTUPTUO
TEMPERATURE (°C)
Output Voltage
vs. Temperature
C
IN
= 10∝F
C
OUT
= 1∝F
CURVES APPLICABLE
AT 100∝A AND 50mA
3 DEVICES
HI / AVG / LO
100
120
140
160
180
200
-60-300 306090120150
)Am(TNERRUCTUPTUO
TEMPERATURE (°C)
Short Circuit Current
vs. Temperature
C
IN
= 10∝F
C
OUT
= 1∝F
3.3
3.4
3.5
-60-30 0 306090120150
)V(EGATLOVYLPPUS.NIM
TEMPERATURE (°C)
Minimum Supply Voltage
vs. Temperature
I
L
= 1mA
VOUT
= 3.3V
C
IN
= 10∝F
C
OUT
= 1∝F
Micrel, Inc. MIC5203
November 2009 7 M9999-111909
Typical Characteristics (continued)
-50
0
50
100
-5 0 5 10 15 20
)Am(TUPTUO
TIME (ms)
-200
-100
0
100
)Vm(TUPTUO
Load Transient
C
OUT
= 10∝F
V
IN
= V
OUT
+ 1
-2
-1
0
1
2
3
)V(TUPTUO
2
4
6
8
-0.2 0.0 0.2 0.4 0.6 0.8 1.0
)V(TUPNI
TIME (ms)
Line Transient
C
L
= 1∝F
I
L
= 1mA
-1
0
1
2
)V(TUPTUO
2
4
6
8
-0.2 0.0 0.2 0.4 0.6 0.8 1.0
)V(TUPNI
TIME (ms)
Line Transient
C
L
= 11∝F
I
L
= 1mA
0
20
40
60
80
100
01x01 0
01x001 0
01x1 3
01x01 3
01x001 3
01x1 6
)Bd(EGATLOVELPPIR
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 1mA
C
L
= 1∝F
V
IN
= V
OUT
+ 1
0
20
40
60
80
100
01x01 0
01x001 0
01x1 3
01x01 3
01x001 3
01x1 6
)Bd(EGATLOVELPPIR
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
I
L
= 50mA
C
L
= 1∝F
V
IN
= V
OUT
+ 1
0
20
40
60
80
100
01x01
0
01x001
0
01x1
3
01x01
3
01x001
3
01x1
6
)Bd(EGATLOVELPPIR
FREQUENCY (Hz)
Ripple Voltage
vs. Frequency
IL = 100∝A
CL = 1∝F
VIN = VOUT + 1
-400
-200
0
200
)Vm(TUPTUO
-50
0
50
100
-1 012345678
)Am(TUPTUO
TIME (ms)
Load Transient
COUT = 1∝F
VIN = VOUT + 1
0.01
0.1
1
10
100
1000
01x1
0
01x01
0
01x001
0
01x1
3
01x01
3
01x001
3
01x1
6
(ECNADEPMITUPTUO )
FREQUENCY (Hz)
Output Impedance
IL = 100∝A
IL = 1mA
IL = 100mA
-1
0
1
2
3
4
5
)V(TUPTUO
-2
0
2
4
-0.2 0.0 0.2 0.4 0.6 0.8 1.0
)V(ELBANE
TIME (ms)
Enable Characteristics
(3.3V Version)
CL = 1∝F
IL = 100∝A
-1.0
0.0
1.0
2.0
3.0
4.0
)V(TUPTUO
-2
0
2
4
-2 0246810
)V(ELBANE
TIME (∝s)
Enable Characteristics
(3.3V Version)
CL = 1∝F
IL = 100∝A
0.50
0.75
1.00
1.25
1.50
-60 -30 0 30 60 90 120 150
)Vm(EGATLOVELBANE
TEMPERATURE (°C)
Enable Voltage
vs. Temperature
C
IN
= 10∝F
C
OUT
= 1∝F
I
L
= 1mA
V
ON
V
OFF
0
10
20
30
40
-60-30 0 306090120150
(TNERRUCELBANE ∝)A
TEMPERATURE (°C)
Enable Current
vs. Temperature
C
IN
= 10∝F
C
OUT
= 1∝F
I
L
= 1mA
V
EN
= 5V
V
EN
= 2V
Micrel, Inc. MIC5203
November 2009 8 M9999-111909
Applications Information
Input Capacitor
A 0.1µF capacitor should be placed from IN to GND if
there is more than 10 inches of wire between the input
and the AC filter capacitor or when a battery is used as
the input.
Output Capacitor
Typical PNP based regulators require an output
capacitor to prevent oscillation. The MIC5203 is
ultrastable, requiring only 0.47µF of output capacitance
for stability. The regulator is stable with all types of
capacitors, including the tiny, low-ESR ceramic chip
capacitors. The output capacitor value can be increased
without limit to improve transient response.
The capacitor should have a resonant frequency above
500kHz. Ceramic capacitors work, but some dielectrics
have poor temperature coefficients, which will affect the
value of the output capacitor over temperature. Tantalum
capacitors are much more stable over temperature, but
typically are larger and more expensive. Aluminum
electrolytic capacitors will also work, but they have
electrolytes that freeze at about –30°C. Tantalum or
ceramic capacitors are recommended for operation
below –25°C.
No-Load Stability
The MIC5203 will remain stable and in regulation with no
load (other than the internal voltage divider) unlike many
other voltage regulators. This is especially important in
CMOS RAM keep-alive applications.
Enable Input
The MIC5203 features nearly zero off-mode current.
When EN (enable input) is held below 0.6V, all internal
circuitry is powered off. Pulling EN high (over 2.0V) re-
enables the device and allows operation. EN draws a
small amount of current, typically 15µA. While the logic
threshold is TTL/CMOS compatible, EN may be pulled
as high as 20V, independent of VIN.
Micrel, Inc. MIC5203
November 2009 9 M9999-111909
Package Information
SOT-143 (M4)
Micrel, Inc. MIC5203
November 2009 10 M9999-111909
Package Information (continued)
SOT-23-5 (M5)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The 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
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical impla
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.
can nt
© 1998 Micrel, Incorporated.
