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 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
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 volt-
ages 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
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, T
A
= 25C, VIN = VO
(NOM)
+ 1V, C
IN
= 1F, C
BYP
= 10nF, C
O
= 1F.
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
I
O
= 0mA
60
75
A
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
A
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)
I
O
= 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
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
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, T
A
= 25C, VIN = VO
(NOM)
+ 1V, C
IN
= 1F, C
BYP
= 10nF, C
O
= 1F.
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
I
O
= 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
V(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
V
EN
= 1.8V, Output ON
6
10
A
NOTE:
(1) As the load resistance further decreases, the SC112 folds back the output current to approximately 100mA at
VO = 0V.
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) C
IN
(C3) is needed if the device is far from the supply's filter capac-
itors, or for operation from a battery. A value of 1.0F or greater should
be used. C
IN
may be tantalum or ceramic.
(2) C
O
(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 tran-
sient 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.
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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