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Dual 150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR
PRELIMINARY - June 15, 2000
SC1456
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1456 contains two low dropout linear regulators that operate from a +2.5V to +6V input range and deliver up to 150mA. PMOS pass transistors allow a low 110A supply current per device to remain independent of load, making these devices ideal for battery operated portable equipment such as cellular phones, cordless phones and personal digital assistants. Each device can be powered from a separate supply voltage or the same supply voltage for maximum flexibility. The output voltage of each device can be preset or adjusted with an external resistor divider. Other features include independant low powered shutdown, short circuit protection, thermal shutdown protection and reverse battery protection for each regulator. The SC1456 comes in the tiny 10 lead MSOP package.
FEATURES * Two guaranteed 150 mA outputs * Designed to operate with ceramic capacitors * Fixed or adjustable outputs * Very small external components * Low 75VRMS output noise * Very low supply currents * Thermal overload protection * Reverse battery protection * Individual low power shutdown * Surface mount packaging (10 pin MSOP) * Full industrial temperature range APPLICATIONS * Battery Powered Systems * Cellular Telephones * Cordless Telephones * Personal Digital Assistants * Portable Instrumentation * Modems * PCMCIA cards
ORDERING INFORMATION
Part Number SC1456XIMSTR
(1)(2)
Package MSOP-10
Notes: (1) Where X denotes voltage options - see table on page 4. Consult factory for other voltage options. (2) Only available in tape and reel packaging. A reel contains 2500 devices.
TYPICAL APPLICATIONS
U1 VIN1 10 1 VIN2 (OR VIN1) C1 1uF C2 1uF 5 6 IN1 EN1 IN2 EN2 GND 2 GND 7 SC1456 OUT1 OUT2 SET1 SET2 9 4 3 8 C3 1uF C4 1uF VOUT1 = PRESET VOUT2 = PRESET
Output Voltages Set Internally
U1 VIN1 10 1 VIN2 (OR VIN1) C1 1uF C2 1uF 5 6 IN1 EN1 IN2 EN2 GND 2 GND 7 R2 SC1456 OUT1 OUT2 SET1 SET2 9 4 3 R1 8 C3 2.2uF C4 1uF VOUT1 (SEE EQUATION) VOUT2 = PRESET
R1 VOUT1 = 1.250 * 1 + R2 R 2 120 k
Output 1 Set Externally and Output 2 Set Internally 1 (c) 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
Dual 150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR
PRELIMINARY - June 15, 2000
SC1456
ABSOLUTE MAXIMUM RATINGS
Parameter Input Supply Voltage Thermal Resistance Junction to Ambient Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 seconds ESD Rating (Human Body Model) Symbol VIN JA TA TJ TSTG TLEAD ESD Maximum -0.3 to +7 113 -40 to +85 -40 to +125 -65 to +150 300 1.25 Units V C/W C C C C kV
ELECTRICAL CHARACTERISTICS
Parameter IN1, IN2 Supply Voltage Range Supply Current VIN IQ Symbol
(1)
Unless specified: VIN = 3.6V, VSET = GND, VEN = VIN, TA = 25C. Values in bold apply over full operating ambient temperature range.
Conditions
Min
Typ
Max
Units
2.5 IOUT = 0mA 50mA IOUT 150mA 90
6.0 130 160 110 160 200
V A
A
VEN = 0V OUT1, OUT2 Output Voltage
(2)
0.0001
1 2
A
VOUT
IOUT = 1mA 1mA IOUT 150mA, VOUT+1V VIN 5.5V 2.5V VIN 5.5V, VSET = VOUT, IOUT = 1mA
-2.0% -3.5%
VOUT
+2.0% +3.5%
V
Line Regulation
(2)
REG(LINE)
5
10 12
mV
Load Regulation
(2)
REG(LOAD)
IOUT = 0mA to 50mA IOUT = 0mA to 100mA IOUT = 0mA to 50mA, VSET = VOUT IOUT = 0mA to 100mA, VSET = VOUT
-10
-15 -20
mV
-15
-20 -25
mV
-2.5
-7.5 -15.0
mV
-5
-15 -30
mV
2 (c) 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
Dual 150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR
PRELIMINARY - June 15, 2000
SC1456
ELECTRICAL CHARACTERISTICS (Cont.)
Unless specified: VIN = 3.6V, VSET = GND, VEN = VIN, TA = 25C. Values in bold apply over full operating ambient temperature range.
(1)
Parameter OUT1, OUT2 (Cont.) Dropout Voltage
(2)(3)
Symbol
Conditions
Min
Typ
Max
Units
VD
IOUT = 1mA IOUT = 50mA IOUT = 100mA
1.1 55 90 120 110 180 240
mV mV
mV
Current Limit Output Voltage Noise
ILIM en PSRR 10Hz to 99kHz, IOUT = 50mA, COUT = 1F COUT = 100F f = 120Hz
150
240 90 75 55
350
mA VRMS dB
Power Supply Rejection Ratio EN1, EN2 EN Input Threshold
(4)
VIH VIL IEN VEN = VIN
1.8 0.4 0 100 200
V
EN Input Bias Current
nA
SET1, SET2 Sense/Select Threshold SET Reference Voltage
(2)
VTH VSET
(4)
20 IOUT = 1mA 1mA IOUT 150mA, 2.5V VIN 5.5V
55
80 1.275 1.294
mV V
1.225 1.250 1.206 0.015
SET Input Leakage Current
ISET
VSET = 1.3V
2.500 5.000
nA
OVER TEMPERATURE PROTECTION High Trip Level Hysteresis THI THYST 170 10 C C
NOTE: (1) This device is ESD sensitive. Use of standard ESD handling precautions is required. (2) Low duty cycle pulse testing with Kelvin connections required. (3) Defined as the input to output differential at which the output voltage drops 100mV below the value measured at a differential of 2V. (4) Guaranteed by design.
3 (c) 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
Dual 150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR
PRELIMINARY - June 15, 2000
SC1456
BLOCK DIAGRAM
PIN CONFIGURATION
VOLTAGE OPTIONS
Replace X in the part number (SC1456XIMS) by the letter shown below for the corresponding voltage option:
X A B C Top View MSOP-10 D
VOUTA (V) 2.5 2.8 3.0 3.3
VOUTB (V) 2.5 2.8 3.0 3.3
PIN DESCRIPTIONS
Pin # 1 2 3 Pin Name Description EN1 GND SET1 Active high enable pin for device 1. Connect to VIN1 if not being used. Ground pin. Can be used for heatsinking if needed. Electrically connected to pin 7. Connecting this pin to ground results in the internally preset value for VOUT1. Connecting to an external resistor divider changes VOUT1 to: R1
VOUT 1 = 1 .250 * 1 + R2
4 5 6 7 8
OUT2 IN2 EN2 GND SET2
Regulator output for device 2, sourcing up to 150mA Supply input pin for device 2. Active high enable pin for device 2. Connect to VIN2 if not being used. Ground pin. Can be used for heatsinking if needed. Electrically connected to pin 2. Connecting this pin to ground results in the internally preset value for VOUT2. Connecting to an external resistor divider changes VOUT2 to:
R1 VOUT 2 = 1 .250 * 1 + R2
9 10
OUT1 IN1
Regulator output for device 1, sourcing up to 150mA Supply input pin for device 1. 4
(c) 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
Dual 150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR
PRELIMINARY - June 15, 2000
SC1456
DEVICE OUTLINE - MSOP-10
ECN 00-1167 5 (c) 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320

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