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PDF ( 数据手册 , 数据表 ) FAN1951D18X

零件编号 FAN1951D18X
描述 1.5A Low-Voltage Low-Dropout Regulator
制造商 Fairchild Semiconductor
LOGO Fairchild Semiconductor LOGO 


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FAN1951D18X 数据手册, 描述, 功能
www.fairchildsemi.com
FAN1950/FAN1951
1.5A Low-Voltage Low-Dropout Regulator
Features
• 1.5A minimum guaranteed output current
• 500mV maximum dropout at 1.5A
Ideal for 2.5V to 1.8V or 1.65V conversion
Ideal for 3.0V to 2.5V conversion
• Current Limiting and Thermal shutdown
• External Shut-down control (FAN1951 only)
• Error flag output (FAN1951 only)
• Fast transient response
• Low ground current
Applications
• General purpose conversion for low-voltage CPUs,
DSP and FPGAs
• SMPS post regulator
• Cable/Satellite set-top boxes
• PCI Graphics adapter cards
General Description
The FAN1950 and FAN1951 are 1.5A low-dropout linear
regulators that provide a low voltage, high current output
with a minimum of external components. Both of these
devices use a PNP output pass element achieving a maxi-
mum 500mV dropout at 1.5A load current. In addition these
devices offer overcurrent limit and thermal shutdown
features to ensure full protection.
The FAN1951 offers a logic level enable pin and an error
flag output to indicate undervoltage and over-current condi-
tions. 1.8V and 2.5V fixed output versions are available.
3.3V, 1.65V and 1.5V options are available upon request.
Typical Application
FAN1950-2.5V
FAN1951-1.8V
3.0V
2.5V
IN OUT
GND
10µF
2.5V IN OUT
100K
Error Output
On/Off
FLAG
EN
GND
1.8V
10µF
REV. 0.1.6 8/30/04







FAN1951D18X pdf, 数据表
FAN1950/FAN1951
Input and Output Capacitor Requirements
A 4.7µF or greater Input Capacitor (Ceramic or Tanta-
lum), installed closely between VIN and GND leads of
the part, is required for stability, better transient
response, noise and ripple rejection. A higher value of
electrolytic input capacitor can be recommended if the
bulk capacitor of the power supply is located more than
3– 4 inches from the device or a large and fast-rise-
time load is a requirement.
FAN1950 and FAN1951, as most of LDO regulators,
require an Output Capacitor. The recommended value
of this capacitor is 10µF. The larger capacitor will
additionally improve the Transient Response, Ripple
Rejection and output noise. The low-ESR Tantalum
capacitors are the best for this application: they provide
stable work and good transient response over the tem-
perature range. Using the Ceramic capacitors as the
Output capacitor can provoke instability (oscillation in
the Output Voltage).
Aluminum electrolytic capacitors also can be used if
their ESR is below 3.
8 REV. 0.1.6 8/30/04














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