Datasheet SC1124.0CSK.TR, SC1125.0CSK.TR, SC1122.2CSK.TR, SC1122.5CSK.TR, SC1122.8CSK.TR Datasheet (Semtech Corporation)
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© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ULTRA LOW DROPOUT
MICROPOWER LINEAR REGULATOR
SC112
PRELIMINARY - July 25, 2000
1
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 30µV (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 1µF capacitor on the output and a 0.01µF on the
bypass pin for a minimum number of external
components.
FEATURES
•= Low dropout voltage
•= CMOS/TTL compatible control switch
•= Very low quiescent current 60µA (ON, no load)
•= Internal thermal shutdown
•= Short circuit protection
•= Very low standby current 0.1µA 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
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DEVICE
(1)(2)
PACKAGE
SC112XXCSK.TR 6 pin SOT-23
ORDERING INFORMATION
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
TYPICAL APPLICATION CIRCUIT
VIN
VO
EN
U1 SC112
1
2
3 4
5
6
EN
GND
BYP VO
GND
VIN
C1
10nF
C2
1uF
C3
1uF
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© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ULTRA LOW DROPOUT
MICROPOWER LINEAR REGULATOR
SC112
PRELIMINARY - July 25, 2000
2
ELECTRICAL CHARACTERISTICS
Unless specified, TA = 25°C, VIN = VO
(NOM)
+ 1V, CIN = 1µF, C
BYP
= 10nF, CO = 1µF.
Values in bold apply over full operating temperature range.
Parameter Symbol Test Conditions MIN TYP MAX Units
VIN
Supply Voltage Range VIN
2.5 14.5
V
Ground Pin Current I
GND
IO = 0mA 60 75 µA
90
I
O
= 60mA 1.0 1.25 mA
1.5
I
O
= 100mA 2.1 2.5
3.0
I
O
= 150mA 4.2 4.75
5.25
V
IN
= 8V, Output OFF
0.1
µA
VO
Output Voltage VO I
O
= 30 mA -2.5 VO +2.5 %
-3.0 +3.0
Line Regulation REG
(LINE)
VIN = (VO
(NOM)
+ 1V) to (VO
(NOM)
+ 6V), 5 10 mV
I
O
= 1mA
20
Load Regulation REG
(LOAD)
IO = 1mA to 60mA 7.5
35
mV
I
O
= 1mA to 100mA 20
65
I
O
= 1mA to 150mA 35
110
Temperature Coefficient
∆VO/∆T
I
O
= 10mA 40 ppm/°C
ABSOLUTE MAXIMUM RATINGS
Parameter Symbol Maximum Units
Input Supply Voltage VIN -0.3 to +16 V
Enable Input Voltage V
EN
-0.3 to VIN V
Power Dissipation P
D
Internally Limited W
Thermal Resistance Junction to Ambient
θ
JA
230 °C/W
Operating Ambient Temperature Range T
A
-40 to +85 °C
Operating Junction Temperature Range T
A
-40 to +125 °C
Storage Temperature Range T
STG
-55 to +150 °C
Lead Temperature (Soldering) 10 sec. T
LEAD
300 °C
ESD Rating ESD 2 kV
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© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ULTRA LOW DROPOUT
MICROPOWER LINEAR REGULATOR
SC112
PRELIMINARY - July 25, 2000
3
ELECTRICAL CHARACTERISTICS
Unless specified, TA = 25°C, VIN = VO
(NOM)
+ 1V, CIN = 1µF, C
BYP
= 10nF, CO = 1µF.
Values in bold apply over full operating temperature range.
Parameter Symbol Test Conditions MIN TYP MAX Units
VO (Cont.)
Current Limit
(1)
I
LIM
180
200 mA
Dropout Voltage V
D
IO = 60mA 130 150 mV
180
I
O
= 100mA 165 195
225
I
O
= 150mA 200 245
275
Power Supply Rejection Ratio RR V
RIPPLE
= 100mV(rms), f = 400Hz, 60 dB
I
O
= 30mA
Output Noise Voltage e
n
10 Hz ≤ f ≤ 80 kHz,
30 µV(rms)
I
O
= 60mA
BYP
Noise Bypass Terminal Voltage V
BYP
1.250 V
EN
Enable Input Threshold Voltage V
IH
Output ON
1.8
V
V
IL
Output OFF
0.5
Enable Input Bias Current I
EN
VEN = 1.8V, Output ON 6
10
µA
NOTE:
(1) As the load resistance further decreases, the SC112 folds back the output current to approximately 100mA at
VO = 0V.
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© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ULTRA LOW DROPOUT
MICROPOWER LINEAR REGULATOR
SC112
PRELIMINARY - July 25, 2000
4
BLOCK DIAGRAM
PIN CONFIGURATION
PIN DESCRIPTION
Pin # Pin Name Description
1 EN Active high enable pin. Connect to VIN if not being used.
2 GND Ground pin. Use for heatsinking along with Pin #5.
3 BYP Noise bypass pin. Connect a 10nF capacitor (required) between this pin and GND.
4 VO Regulator output, supplying a guaranteed 150mA.
5 GND Ground pin. Use for heatsinking along with Pin #2.
6 VIN Power input pin.
Top View
SOT-23-6L
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 1.0µF or greater should
be used. C
IN
may be tantalum or ceramic.
(2) C
O
(C2) should be a 1µF or greater tantalum or ceramic capacitor,
with an Equivalent Series Resistance (ESR) between 10mΩ and 1Ω
over temperature. Larger value capacitors will improve the overall transient response.
(3) C
BYP
(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 V
IN
if the shutdown feature is not required. Maxi-
mum EN voltage = V
IN
.
(5) Connect both ground pins (2 and 5) to ground to maximize heat
conduction.
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© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
150mA ULTRA LOW DROPOUT
MICROPOWER LINEAR REGULATOR
SC112
PRELIMINARY - July 25, 2000
5
DEVICE OUTLINE - SOT23-6L
MINIMUM LAND PATTERN - SOT23-6L
ECN00-1203
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