MICREL MIC5246-3.3BM5, MIC5246-2.7BM5, MIC5246-2.85BM5, MIC5246-2.8BM5, MIC5246-3.0BM5 Datasheet
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MIC5246 Micrel
MIC5246
150mA µCap CMOS LDO Regulator
Preliminary Information
General Description
The MIC5246 is an efficient, precise CMOS voltage regulator
optimized for low-noise applications. The MIC5246 offers
better than 1% initial accuracy, extremely-low-dropout voltage (typically 150mV at 150mA) and constant ground current
(typically 85µA)over load . The MIC5246 features an error
flag that indicates an output fault condition such as overcurrent,
thermal shutdown and dropout. The MIC5246 provides a very
low noise output, ideal for RF applications where quiet
voltage sources are required.
Designed specifically for hand-held and battery-powered
devices, the MIC5246 provides a TTL-logic-compatible enable pin. When disabled, power consumption drops nearly to
zero.
The MIC5246 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Key features include current limit, thermal shutdown, a pushpull output for faster transient response, and an active clamp
to speed up device turnoff. Available in the IttyBitty™ SOT-23-5
package, the MIC5246 also offers a range of fixed output
voltages.
Features
• Error flag indicates fault condition
• Ultralow dropout—100mV @ 100mA
• Load independent, ultralow ground current: 85µA
• 150mA output current
• Current limiting
• Thermal Shutdown
• Tight load and line regulation
•“Zero” off-mode current
• Stability with low-ESR capacitors
• Fast transient response
• TTL-Logic-controlled enable input
Applications
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• PCMCIA VCC and VPP regulation/switching
• Consumer/personal electronics
• SMPS post-regulator/dc-to-dc modules
• High-efficiency linear power supplies
Typical Application
Ordering Information
Part Number Marking Voltage Junction Temp. Range Package
MIC5246-2.6BM5 LT26 2.6V –40°C to +125°C SOT-23-5
MIC5246-2.7BM5 LT27 2.7V –40°C to +125°C SOT-23-5
MIC5246-2.8BM5 LT28 2.8V –40°C to +125°C SOT-23-5
MIC5246-2.85BM5 LT2J 2.85V –40°C to +125°C SOT-23-5
MIC5246-3.0BM5 LT30 3.0V –40°C to +125°C SOT-23-5
MIC5246-3.3BM5 LT33 3.3V –40°C to +125°C SOT-23-5
Other voltages available. Contact Micrel for details.
47kΩ
MIC5246-x.xBM5
V
IN
15
2
Enable
Shutdown
EN (pin 3) may be
connected directly
to IN (pin 1).
34
EN
Low-Noise Regulator Application
V
OUT
C
OUT
FLG
C
FLG
IttyBitty 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
June 2000 1 MIC5246
MIC5246 Micrel
Pin Configuration
Pin Description
Pin Number Pin Name Pin Function
1 IN Supply Input
2 GND Ground
3 EN Enable/Shutdown (Input): CMOS compatible input. Logic high = enable;
4 FLG Error Flag (Output): Open-drain output. Active low indicates an output
5 OUT Regulator Output
GND
2
IN
13
EN
LTxx
45
FLG
MIC5246-x.xBM5
logic low = shutdown. Do not leave open.
undervoltage condition.
OUT
Absolute Maximum Ratings (Note 1)
Supply Input Voltage (VIN) .................................. 0V to +7V
Enable Input Voltage (VEN) .................................. 0V to V
Flag Output Voltage (V
Junction Temperature (TJ) ...................................... +150°C
Storage Temperature ............................... –65°C to +150°C
).................................. 0V to V
FLG
Operating Ratings (Note 2)
Input Voltage (VIN) ......................................... +2.7V to +6V
Enable Input Voltage (VEN) .................................. 0V to V
IN
Flag Output Voltage (V
IN
Junction Temperature (TJ) ....................... –40°C to +125°C
Thermal Resistance (θJA)......................................235°C/W
).................................. 0V to V
FLG
IN
IN
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD, Note 3
MIC5246 2 June 2000
MIC5246 Micrel
Electrical Characteristics
VIN = V
Symbol Parameter Conditions Min Typical Max Units
V
O
∆V
LNR
∆V
LDR
VIN – V
I
Q
I
GND
PSRR Power Supply Rejection f = 120Hz, C
I
LIM
Enable Input
V
IL
V
IH
I
EN
Thermal Protection
Error Flag
V
FLG
V
OL
I
FL
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. Devices are ESD sensitive. Handling precautions recommended.
Note 4. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
Note 5. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V
Note 6. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground
Note 7. The error flag is a function of the output voltage being 5% low and the detection of one of the following: overcurrent, overtemperature or
+ 1V, VEN = V
OUT
Output Voltage Accuracy I
= 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
IN; IOUT
= 0mA –11%
OUT
–22%
OUT
Line Regulation VIN = V
Load Regulation I
Dropout Voltage, Note 5 I
OUT
OUT
I
OUT
I
OUT
I
OUT
+ 0.1V to 6V –0.3 0 0.3 %/V
OUT
= 0.1mA to 150mA, Note 4 23%
= 100µA 1.5 5 mV
= 50mA 50 85 mV
= 100mA 100 150 mV
= 150mA 150 200 mV
250 mV
Quiescent Current VEN ≤ 0.4V (shutdown) 0.2 1 µA
Ground Pin Current, Note 6 I
Current Limit V
= 0mA 85 150 µA
OUT
I
= 150mA 85 150 µA
OUT
= 10µF50dB
OUT
= 0V 160 300 mA
OUT
Enable Input Logic-Low Voltage VIN = 2.7V to 5.5V, regulator shutdown 0.8 0.4 V
Enable Input Logic-High Voltage VIN = 2.7V to 5.5V, regulator enabled 1.6 1V
Enable Input Current VIL ≤ 0.4V 0.01 µA
VIH ≥ 1.6V 0.01 µA
Shutdown Resistance Discharge 500 Ω
Thermal Shutdown Temperature 150 °C
Thermal Shutdown Hysteresis 10 °C
Low Threshold % of V
High Threshold % of V
(Flag ON) 90 %
OUT
(Flag OFF) 96 %
OUT
Output Logic-Low Voltage IL = 100µA, fault condition 0.02 0.4 V
Flag Leakage Current flag off, V
range from 0.1mA to 150mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
differential. For outputs below 2.7V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.7V. Minimum
input operating voltage is 2.7V.
pin current.
dropout. See “Applications Information” section for additional information.
= 6V 0.01 µA
FLG
June 2000 3 MIC5246
MIC5246 Micrel
)
)
)
)
Typical Characteristics
Power Supply Rejection Ratio
60
50
40
30
PSRR (dB)
20
10
I
= 100µA
LOAD
0
1x1011x1021x1031x1041x1051x10
FREQUENCY (Hz
Power Supply Rejection Ratio
60
50
40
30
PSRR (dB)
20
10
I
= 150mA
0
1x1011x1021x1031x1041x1051x10
FREQUENCY (Hz
Power Supply Rejection Ratio
60
50
40
30
PSRR (dB)
20
10
I
= 50mA
LOAD
6
0
1x1011x1021x1031x1041x1051x10
FREQUENCY (Hz
6
Ground Current
vs. Output Current
90
88
86
84
82
GROUND CURRENT (µA)
6
80
0 1 10 100 1000
OUTPUT CURRENT (mA)
Power Supply Rejection Ratio
60
50
40
30
PSRR (dB)
20
10
I
= 100mA
LOAD
0
1x1011x1021x1031x1041x1051x10
FREQUENCY (Hz
Ground Pin Current
100
80
60
40
20
GROUND CURRENT (µA)
Iload = 100µA
0
-40 -10 20 50 80 110 140
TEMPERATURE (°C)
6
Ground Pin Current
100
80
60
40
20
GROUND CURRENT (µA)
I
= 150mA
LOAD
0
-40 -10 20 50 80 110 140
TEMPERATURE (°C)
Dropout Characteristics
4
3
2
1
VOLTAGE OUT (V)
0
012345
100µA
150mA
VOLTAGE IN (V)
Ground Pin Current
100
80
60
40
20
GROUND CURRENT (µA)
0
012345
I
LOAD
VOLTAGE IN (V)
= 100µA
Dropout Voltage
200
150
100
50
DROPOUT VOLTAGE (µV)
0
-40 -10 20 50 80 110 140
TEMPERATURE (°C)
I
LOAD
= 100µA
Ground Pin Current
100
80
60
40
20
GROUND CURRENT (µA)
0
012345
I
= 150mA
VOLTAGE IN (V)
Dropout Voltage
250
200
150
100
50
DROPOUT VOLTAGE (µV)
0
-40 -10 20 50 80 110 140
TEMPERATURE (°C)
I
LOAD
= 150mA
MIC5246 4 June 2000
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