MICREL MIC5247-1.8BM5, MIC5247-2.0BM5, MIC5247-2.4BM5, MIC5247-1.5BM5 Datasheet

MIC5247 Micrel
MIC5247
150mA Low-Voltage µCap Linear Regulator
Preliminary Information
General Description
The MIC5247 is an efficient, precise low voltage CMOS voltage regulator optimized for ultra-low-noise applications. The MIC5247 offers better than 1% initial accuracy, and 85µA constant ground current over load (typically 85µA). The MIC5247 provides a very low noise output, ideal for RF applications where quiet voltage sources are required. A noise bypass pin is also available for further reduction of output noise.
The MIC5247 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 MIC5247 also offers a range of fixed output voltages.
Features
Ultralow noise
Low voltage outputs
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
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
MIC5247-1.5BM5 LU15 1.5V –40°C to +125°C SOT-23-5 MIC5247-1.8BM5 LU18 1.8V –40°C to +125°C SOT-23-5 MIC5247-2.0BM5 LU20 2.0V –40°C to +125°C SOT-23-5 MIC5247-2.4BM5 LU24 2.4V –40°C to +125°C SOT-23-5
Other voltages available. Contact Micrel for details.
MIC5247-x.xBM5
V
IN
15 2
Enable
Shutdown
EN (pin 3) may be connected directly to IN (pin 1).
3
EN
4
Ultra-Low-Noise Regulator Application
V
OUT
C
OUT
C
BYP
(optional)
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
November 6, 2000 1 MIC5247
MIC5247 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 BYP Reference Bypass: Connect external 0.01pF capacitor to GND to reduce
5 OUT Regulator Output
GND
2
IN
13
EN
LUxx
45
OUTBYP
MIC5247-x.xBM5
logic low = shutdown. Do not leave open.
output noise. May be left open.
Absolute Maximum Ratings (Note 1)
Supply Input Voltage (VIN) .................................. 0V to +7V
Enable Input Voltage (VEN) .................................. 0V to V
Junction Temperature (TJ) ...................................... +150°C
Storage Temperature ............................... –65°C to +150°C
Operating Ratings (Note 2)
Input Voltage (VIN) ......................................... +2.7V to +6V
Enable Input Voltage (VEN) .................................. 0V to V
IN
Junction Temperature (TJ) ....................... –40°C to +125°C
Thermal Resistance JA)......................................235°C/W
IN
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD, Note 3
MIC5247 2 November 6, 2000
MIC5247 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 1kHz 50 dB I
LIM
e
n
Enable Input
V
IL
V
IH
I
EN
Thermal Protection
+ 1.0V; VIN = VEN; I
OUT
Output Voltage Accuracy I
Line Regulation VIN = V Load Regulation I Load Regulation for 1.5V only I
OUT
Dropout Voltage I Quiescent Current V Ground Pin Current, Note 6 I
Current Limit V Output Voltage Noise C
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
Shutdown Resistance Discharge 500
Thermal Shutdown Temperature 150 °C Thermal Shutdown Hysteresis 10 °C
= 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ +125°C; unless noted.
OUT
= 0mA –11%
OUT
22%
+ 0.1V to 6V –0.3 +0.3 %/V
OUT
= 0.1mA to 150mA, Note 4 23%
OUT
= 0.1mA to 150mA, V
OUT
= 150mA (see Note 5) 150 mV
OUT
0.4V (shutdown) 0.2 1 µA
EN
= 0mA 85 150 µA
OUT
I
= 150mA 85 150 µA
OUT
= 0V 160 300 mA
OUT
= 10µF, C
OUT
f = 10Hz to 100kHz
= 0.01µF, 30 µVrms
BYP
= 1.5V 3 4 %
OUT
VIH 1.6V 0.01 µA
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 a1V
Note 6. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of
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.
the load current plus the ground pin current.
November 6, 2000 3 MIC5247
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