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參數(shù)資料
| 型號： | SC560 |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual Output Low Noise LDO Linear Regulator |
| 中文描述： | 雙輸出低噪聲LDO線性穩(wěn)壓器 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大小： | 297K |
| 代理商： | SC560 |
POWER MANAGEMENT
1
SC560
Dual Output Low Noise LDO
Linear Regulator
Features
Input voltage range — 2.5V to 5.5V
Output voltage ranges
—
1.2V to 3.3V (each LDO)
Maximum output current — 300mA (both LDOs)
Dropout at 200mA load
—
200mV max.
Quiescent supply current
—
100μA (both LDOs
enabled)
Shutdown current
—
100nA (typ)
Output noise < 50μV
RMS
(SC560A and fixed output
versions)
PSRR < -65dB at 1kHz (SC560A and fixed output
versions)
Over-temperature protection
Short-circuit protection
Under-voltage lockout
Power good monitor for output A (SC560C and fixed
output versions)
Independent enable/disable for LDOB (SC560C and
fixed output versions)
MLPQ-UT8, 1.5mm x 1.5mm x 0.6mm package
Applications
PDAs and cellular phones
GPS devices
Palmtop computers and handheld instruments
TFT/LCD applications
Wireless handsets
Digital cordless phones and PCS phones
Personal communicators
Wireless LAN
Description
The SC560 is a family of dual output, ultra-low dropout
linear voltage regulators designed for use in battery
powered wireless applications. The SC560A, SC560B, and
SC560C provide adjustable output voltages that can be
set using two external resistors. Fixed output voltages
are also available (see ordering information for available
combinations). Fixed output devices provide the power-
good monitor, independent enable pins, and a bypass pin
for low-noise operation
All members of the SC560 family require an input voltage
level between 2.5V and 5.5V. Output voltages for the
adjustable versions can vary between 1.2V and 3.3V. Fixed
output voltage options are also chosen from this range.
The SC560A provides superior low-noise performance
by using an external bypass capacitor connected to pin
7 to filter the bandgap reference. The SC560B uses pin 7
as a separate enable pin for the second regulator output
so the two outputs can be controlled independently.
The SC560C uses this pin to provide a PGOOD output
to hold a processor in reset when the voltage on OUTA
is not in regulation. All other versions provide all three
functions with fixed output voltages (no feedback pins
are provided).
The device also provides protection circuitry such as
current limiting, under-voltage lockout, and thermal
protection to prevent device failures. Stability is
maintained by using 1μF capacitors on the output pins.
The MLPQ-UT8 package and 0402 ceramic capacitors
minimize the required PCB area.
C
IN
2.2
μ
F
OUTA
OUTB
VIN
ENB
EN
OUTB
EN
OUTA
GND
ENB
PGOOD
BYP
VIN
SC560D
C
OUTA
1
μ
F
C
OUTB
1
μ
F
C
BYP
22nF
PGOOD
Typical Application Circuit
September 12, 2007
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|---|---|
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