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SC1456_05 Datasheet, PDF (1/10 Pages) Semtech Corporation – Dual 150mA Ultra Low Dropout, Low Noise Regulator
POWER MANAGEMENT
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
110µA 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 (lead
free, fully WEEE and RoHS compliant available).
Typical Application Circuits
SC1456
Dual 150mA Ultra Low
Dropout, Low Noise Regulator
Features
‹ Two guaranteed 150 mA outputs
‹ Designed to operate with ceramic capacitors
‹ Fixed or adjustable outputs
‹ Very small external components
‹ Low 75µV output noise
RMS
‹ Very low supply currents
‹ Thermal overload protection
‹ Reverse battery protection
‹ Individual low power shutdown
‹ Full industrial temperature range
‹ Surface mount packaging (10 pin MSOP)
Applications
‹ Battery Powered Systems
‹ Cellular Telephones
‹ Cordless Telephones
‹ Personal Digital Assistants
‹ Portable Instrumentation
‹ Modems
‹ PCMCIA cards
VIN1
VIN2
(OR VIN1)
C1
C2
1uF
1uF
U1
10 IN1
1 EN1
5 IN2
6 EN2
SC1456
OUT1 9
OUT2 4
SET1 3
SET2 8
GND GND
2
7
VOUT1 = PRESET
VOUT2 = PRESET
C3
C4
1uF
1uF
VIN1
VIN2
(OR VIN1)
C1
C2
1uF
1uF
Output Voltages Set Internally
U1
10 IN1
SC1456
OUT1 9
1 EN1
OUT2 4
5 IN2
SET1 3
R1
6 EN2
SET2 8
GND GND
2
7
R2
VOUT1 (SEE EQUATION)
VOUT2 = PRESET
C3
2.2uF
C4
1uF
VOUT1
=
1.250
•
1 +

R1
R2


R2 ≤ 120kΩ
Revision: November 16, 2005
Output 1 Set Externally and Output 2 Set Internally
1
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