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POWER MANAGEMENT Description
The SC112 is a 150mA ultra low dropout linear regulator with a built in CMOS/TTL logic level enable, designed specifically for battery powered applications where low quiescent current and low dropout are critical for battery longevity.
150mA Ultra Low Dropout Micropower Linear Regulator
PRELIMINARY Features
Low dropout voltage
SC112
u u u u u u The SC112 uses a Semtech proprietary internal PNP device for the pass element, providing a low dropout u u voltage of 130mV at a load of 60mA. u
The output noise is reduced to 30V (typical) by placing a very low leakage 10nF capacitor on pin 3 (noise bypass). Each device contains a bandgap reference, error amplifier, PNP pass element, thermal and current limiting circuitry and resistor divider network for setting output voltage.
CMOS/TTL compatible control switch Very low quiescent current 60A (ON, no load) Internal thermal shutdown Short circuit protection Very low standby current 0.1A maximum (OFF) Low noise with external bypass capacitor Industrial temperature range SOT-23-6 package
Applications
Battery powered systems Cellular telephones Cordless telephones Pagers Personal digital assistants Portable instrumentation Low voltage systems
u u u u u u The SC112 is packaged in a six lead SOT-23 surface mount package for a very small footprint and it requires u
only a 1F capacitor on the output and a 0.01F on the bypass pin for a minimum number of external components.
Typical Application Circuit
U1 SC112 EN 1 2 3 EN VIN 6 5 4 VO VIN
GND GND BYP VO
C1 10nF
C2 1uF
C3 1uF
Notes: (1) CIN (C3) is needed if the device is far from the supplys filter capacitors, or for operation from a battery. A value of 1.0F or greater should be used. CIN may be tantalum or ceramic. (2) CO (C2) should be a 1F or greater tantalum or ceramic capacitor, with an Equivalent Series Resistance (ESR) between 10mW and 1W over temperature. Larger value capacitors will improve the overall transient response. (3) CBYP (C1 - required) should be placed as close as possible to pin 3 and ground. A 10nF ceramic capacitor is recommended. (4) EN may be tied to VIN if the shutdown feature is not required. Maximum EN voltage = VIN. (5) Connect both ground pins (2 and 5) to ground to maximize heat conduction.
Revision 1, January 2001
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SC112
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Input Supply Voltage Enable Input Voltage Power D i ssi pati on Thermal Resi stance Juncti on to Ambi ent Thermal Resi stance Juncti on to C ase Operati ng Ambi ent Temperature Range Operati ng Juncti on Temperature Range Storage Temperature Range Lead Temperature (Solderi ng) 10 Sec. ESD Rati ng (Human Body Model) Sy mbol VIN V EN PD q JA q JC TA TJ TSTG TLEAD V ESD Maximum -0.3 to +16 -0.3 to VIN Internally Li mi ted 230 81 -40 to +85 -40 to +125 -65 to 150 300 2
PRELIMINARY
U nits V V W C /W C /W C C C C kV
Electrical Characteristics
Unless specified: TA = 25C, VIN = (VO(NOM) + 1V), CIN = 1F, CBYP = 10nF, CO = 1F. Values in bold apply over full operating temperature range.
Parameter VIN Supply Voltage Range Ground Pi n C urrent
Sy mbol
Test C onditions
Min
Ty p
Max
U nits
VIN IGND IO = 0mA
2.5 60
14.5 75 90
V A
IO = 60mA
1.00
1.25 1.50
mA
IO = 100mA
2.1
2.5 3.0
IO = 150mA
4.20
4.75 5.25
VIN = 8V, Output OFF VO Output Voltage VO IO = 30mA -2.5 -3.0 Li ne Regulati on REG(LINE) VIN = (VO(NOM) + 1V) to (VO(NOM) + 6V), IO = 1mA 5 VO
0.1
A
+2.5 +3.0 10 20
%
mV
a 2001 Semtech Corp.
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SC112
POWER MANAGEMENT Electrical Characteristics (Cont.)
Parameter VO (C ont.) Load Regulati on REG(LOAD) IO = 1mA to 60mA IO = 1mA to 100mA IO = 1mA to 150mA Temperature C oeffi ci ent C urrent Li mi t(1) D ropout Voltage DVO/DT ILIM VD IO = 60mA IO = 10mA 180 7.5 20 35 40 200 130 150 180 IO = 100mA 165 195 225 IO = 150mA 200 245 275 Power Supply Rejecti on Rati o Output Noi se Voltage B YP Noi se Bypass Termi nal Voltage EN Enable Input Threshold Voltage VIH VIL Enable Input Bi as C urrent IEN Output ON Output OFF VEN = 1.8V, Output ON 6 1.8 0.5 10 A V VBYP 1.250 V PSRR en VAC = 100mVRMS, f = 400Hz, IO = 30mA 10Hz f 80kHz, IO = 60mA 60 30 dB VRMS 35 65 110 ppm/C mA mV mV Sy mbol Test C onditions Min Ty p
PRELIMINARY
Unless specified: TA = 25C, VIN = (VO(NOM) + 1V), CIN = 1F, CBYP = 10nF, CO = 1F. Values in bold apply over full operating temperature range.
Max
U nits
Note: (1) As the load resistance further decreases, the SC112 folds back the output current to approximately 100mA at VO = 0V.
a 2001 Semtech Corp.
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SC112
POWER MANAGEMENT Pin Configuration
Top View
PRELIMINARY Ordering Information
D ev ice
(1)(2)
P ackag e SOT-23-6
SC 112XXC SK.TR
SOT-23-6
Notes: (1) Where XX denotes voltage options. Available voltages are: 2.2V (22), 2.5V (25), 2.8V (28), 3.0V (30), 3.3V (33), 3.6V (36), 3.8V (38), 4.0V (40) and 5.0V (50). Contact factory for additional voltage options. (2) Only available in tape and reel packaging. A reel contains 3000 devices.
Block Diagram
Pin Descriptions
Pin 1 2 3 Pin Pin Function N ame EN GND BYP Acti ve hi gh enable pi n. C onnect to VIN i f not bei ng used. Ground pi n. Use for heatsi nki ng along wi th P i n #5. No i s e b yp a s s p i n. C o nne c t a 1 0 nF capaci tor (requi red) between thi s pi n and GND . Re g ula to r o utp ut, sup p lyi ng a g ua ra nte e d 150 mA. Ground pi n. Use for heatsi nki ng along wi th P i n #2. Power i nput pi n.
4 5 6
VO GND VIN
a 2001 Semtech Corp.
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SC112
POWER MANAGEMENT Outline Drawing - SOT23-6 PRELIMINARY
Minimum Land Pattern -SOT23-6
Contact Information
Semtech Corporation Power Management Products Division 652 Mitchell Rd., Newbury Park, CA 91320 Phone: (805)498-2111 FAX (805)498-3804
a 2001 Semtech Corp.
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