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FAN1950D25X Schematic ( PDF Datasheet ) - Fairchild Semiconductor

Teilenummer FAN1950D25X
Beschreibung 1.5A Low-Voltage Low-Dropout Regulator
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 




Gesamt 11 Seiten
FAN1950D25X Datasheet, Funktion
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






FAN1950D25X Datasheet, Funktion
FAN1950/FAN1951
Typical Performance Characteristics (continued)
30.00
Ground Current vs. Temperature
Vin = 3V
25.00
20.00
IGND_ @ 1.5A
15.00
10.00
IGND @ 750mA
5.00
0.00
-50
IGND_@10mA
0
50
100
Temperature (C)
150
FAN1950D18 Short-Circuit Recovery Response
FAN1950D18 Short-Circuit Transient Response
Vin = 3V, Vout = 1.8V
Ch.1 – Vout (1V/div) Ch.2 – Load Current (2A/div)
FAN1950D25 Short-Circuit Recovery Response
Vin = 3V, Vout = 1.8V
Ch.1 – Vout (1V/div) Ch.2 – Load Current (2A/div)
FAN1950D25 Short-Circuit Transient Response
Vin = 3V, Vout = 2.5V
Ch.1 – Vout (1V/div) Ch.2 – Load Current (2A/div)
Vin = 3V, Vout = 2.5V
Ch.1 – Vout (1V/div) Ch.2 – Load Current (2A/div)
6 REV. 0.1.6 8/30/04

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