SC1456 Datasheet, PDF (1/5 Pages) Semtech Corporation – Dual 150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR

Dual 150mA ULTRA LOW DROPOUT,
LOW NOISE REGULATOR
SC1456
PRELIMINARY - June 15, 2000
TEL:[phone] FAX:[phone] 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 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.
ORDERING INFORMATION
Part Number
SC1456XIMSTR⁽¹⁾⁽²⁾
Package
MSOP-10
FEATURES
• Two guaranteed 150 mA outputs
• Designed to operate with ceramic capacitors
• Fixed or adjustable outputs
• Very small external components
• Low 75µV_RMS 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
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
VIN1
VIN2
(OR VIN1)
C1
C2
1uF
1uF
U1
10
IN1
1 _EN1
5 _IN2
6 _EN2
SC1456
9
OUT1
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
9
OUT1
1 _EN1
OUT2 ⁴
5 _IN2
SET1 ³
R1
6
EN2
8
SET2
GND GND
2
7
R2
VOUT1 (SEE EQUATION)
VOUT2 = PRESET
C3
C4
2.2uF
1uF
V_OUT1
=
1.250
•
1 +

R1
R2


R2 ≤ 120kΩ
© 2000 SEMTECH CORP.
Output 1 Set Externally and Output 2 Set Internally
1
652 MITCHELL ROAD NEWBURY PARK CA 91320