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參數(shù)資料
| 型號： | SC561 |
| 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： | 288K |
| 代理商： | SC561 |
POWER MANAGEMENT
1
SC561
Dual Output Low Noise LDO
Linear Regulator
Features
Input voltage range — 2.5V to 5.5V
Output voltage — V
LDOA
= 3.1V; V
LDOB
= 2.85V
Maximum output current
—
300mA (each LDO)
Dropout at 200mA load
—
200mV max.
Quiescent supply current
—
40μA (both LDOs
enabled)
Shutdown current
—
100nA (typ)
Output noise < 50μV
RMS
PSRR >65dB at 1kHz
Over-temperature protection
Short-circuit protection
Under-voltage lockout
Power good monitor for output A
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 SC561 is a dual output, ultra-low dropout linear
voltage regulator designed for use in battery powered
applications. The SC561 provides fixed output voltages of
V
= 3.1V and V
= 2.85V
, and up to 300mA of load
current per channel.
In applications where maximum battery life is essential,
the SC561 can operate in an extremely low power state by
setting the dynamic bias control. At very light loads, the
LOAD pin can be pulled low so that the device consumes
only 40μA of quiescent current.
The SC561 provides superior low-noise performance by
using an external bypass capacitor to filter the bandgap
reference. The device also has a PGOOD output to hold a
processor in reset when the voltage on OUTA is not in
regulation.
The device provides protection circuitry such as short-
circuit protection, under-voltage lockout, and thermal
protection to prevent device failures. Stability is main-
tained by using 1μF capacitors on the output pins. The
MLPQ-UT8 package and small ceramic bypass capacitors
minimize the required PCB area.
C
IN
2.2
μ
F
OUTA
OUTB
VIN
LOAD
EN
OUTB
EN
OUTA
GND
LOAD
PGOOD
BYP
IN
SC561
C
OUTA
1
μ
F
C
OUTB
1
μ
F
C
BYP
22nF
PGOOD
Typical Application Circuit
November 21, 2007
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