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150mA ULTRA LOW DROPOUT MICROPOWER LINEAR REGULATOR
PRELIMINARY - July 25, 2000
SC112
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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. The SC112 uses a Semtech proprietary internal PNP device for the pass element, providing a low dropout voltage of 130mV at a load of 60mA. 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. The SC112 is packaged in a six lead SOT-23 surface mount package for a very small footprint and it requires only a 1F capacitor on the output and a 0.01F on the bypass pin for a minimum number of external components.
FEATURES *= *= *= *= *= *= *= *=
Low dropout 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
APPLICATIONS *= *= *= *= *= *=
Battery powered systems Cellular telephones Cordless telephones Pagers, personal digital assistants Portable instrumentation Low voltage systems
ORDERING INFORMATION
DEVICE
(1)(2)
PACKAGE 6 pin SOT-23
SC112XXCSK.TR
TYPICAL APPLICATION CIRCUIT
Notes: (1) Where XX denotes voltage options. Available voltages are: 2.2V, 2.5V, 2.8V, 3.0V, 3.3V, 3.6V, 3.8V, 4.0V and 5.0V. Contact factory for additional voltage options. (2) Only available in tape and reel packaging. A reel contains 3000 devices
U1 SC112 EN 1 2 3 EN VIN 6 5 4 VO VIN
GND GND BYP VO
C1 10nF
C2 1uF
C3 1uF
1 (c) 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ULTRA LOW DROPOUT MICROPOWER LINEAR REGULATOR
PRELIMINARY - July 25, 2000
SC112
ABSOLUTE MAXIMUM RATINGS
Parameter Input Supply Voltage Enable Input Voltage Power Dissipation Thermal Resistance Junction to Ambient Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 sec. ESD Rating Symbol VIN VEN PD JA TA TA TSTG TLEAD ESD Maximum -0.3 to +16 -0.3 to VIN Internally Limited 230 -40 to +85 -40 to +125 -55 to +150 300 2 Units V V 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 Pin Current
Symbol
Test Conditions
MIN
TYP
MAX
Units
VIN IGND IO = 0mA IO = 60mA IO = 100mA IO = 150mA VIN = 8V, Output OFF
2.5 60
14.5 75 90 1.0 1.25 1.5 2.1 2.5 3.0 4.2 4.75 5.25 0.1
V A
mA
A
VO Output Voltage VO IO = 30 mA VIN = (VO(NOM) + 1V) to (VO(NOM) + 6V), IO = 1mA Load Regulation REG(LOAD) IO = 1mA to 60mA IO = 1mA to 100mA IO = 1mA to 150mA Temperature Coefficient VO/T IO = 10mA 7.5 20 35 40 -2.5 -3.0 Line Regulation REG(LINE) 5 VO +2.5 +3.0 10 20 35 65 110 ppm/C 2 (c) 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 mV mV %
150mA ULTRA LOW DROPOUT MICROPOWER LINEAR REGULATOR
PRELIMINARY - July 25, 2000
SC112
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 VO (Cont.) Current Limit(1) Dropout Voltage
Symbol
Test Conditions
MIN
TYP
MAX
Units
ILIM VD IO = 60mA IO = 100mA IO = 150mA
180
200 130 150 180 165 195 225 200 245 275
mA mV
Power Supply Rejection Ratio
RR
VRIPPLE = 100mV(rms), f = 400Hz, IO = 30mA 10 Hz f 80 kHz, IO = 60mA
60
dB
Output Noise Voltage
en
30
V(rms)
BYP Noise Bypass Terminal Voltage EN Enable Input Threshold Voltage VIH VIL Enable Input Bias Current IEN Output ON Output OFF VEN = 1.8V, Output ON 6 1.8 0.5 10 A V VBYP 1.250 V
NOTE: (1) As the load resistance further decreases, the SC112 folds back the output current to approximately 100mA at VO = 0V.
3 (c) 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ULTRA LOW DROPOUT MICROPOWER LINEAR REGULATOR
PRELIMINARY - July 25, 2000
SC112
BLOCK DIAGRAM
PIN CONFIGURATION
Top View
APPLICATION HINTS (Refer to Sheet 1):
(1) CIN (C3) is needed if the device is far from the supply's 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 10m and 1 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.
SOT-23-6L
PIN DESCRIPTION
Pin # 1 2 3 4 5 6 Pin Name EN GND BYP VO GND VIN Description Active high enable pin. Connect to VIN if not being used. Ground pin. Use for heatsinking along with Pin #5. Noise bypass pin. Connect a 10nF capacitor (required) between this pin and GND. Regulator output, supplying a guaranteed 150mA. Ground pin. Use for heatsinking along with Pin #2. Power input pin.
4 (c) 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ULTRA LOW DROPOUT MICROPOWER LINEAR REGULATOR
PRELIMINARY - July 25, 2000
SC112
DEVICE OUTLINE - SOT23-6L
MINIMUM LAND PATTERN - SOT23-6L
ECN00-1203
5 (c) 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

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