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부품번호 | FAN1950D25X 기능 |
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기능 | 1.5A Low-Voltage Low-Dropout Regulator | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 11 페이지수
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
100KΩ
Error Output
On/Off
FLAG
EN
GND
1.8V
10µF
REV. 0.1.6 8/30/04
FAN1950/FAN1951
Parameter
Conditions
Min. Typ. Max. Units
Thermal Shutdown Temperature
150 °C
Thermal Shutdown Hysteresis
10 °C
Shutdown output current
VEN ≤ 0.8V, VIN ≤ 8V, VOUT = 0V
•
20 µA
Notes:
1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are
measured at a constant junction temperature by low duty cycle pulse testing.
2. Line and load regulation are guaranteed up to the maximum power dissipation. Power dissipation is determined by input/
output differential and the output current. Guaranteed maximum output power will not be available over the full input/output
voltage range.
3. Dropout voltage = VIN – VOUT when VOUT decreases to 98% of its nominal output voltage with VIN = VOUT + 1V. For output
voltages below 2.25V, dropout voltage is the input-to-output voltage differential with the minimum input voltage being 2.25V.
Minimum input operating voltage is 2.25V.
4. Flag output cannot be pulled to a voltage higher than VIN.
4 REV. 0.1.6 8/30/04
4페이지 Typical Performance Characteristics (continued)
FAN1950/FAN1951
Load Transient Response
Vin=2.5V, Vout=1.8V, Cin=10µF Ceramic
Load Transient Response
Vin=2.5V, Vout=1.8V, Cin=10µF Ceramic
Cout = 10µF Tantalum (ESR~700mΩ)
Ch1 – Vout (AC, 0.5V/div) Ch2 – Load Current (1A/div.)
1.834
1.824
1.814
1.804
1.794
1.784
1.774
1.764
-100
Vout vs. Temperature
-50 0 50 100
Junction Temperature (°C)
Iout = 10 mA; Vout = 1.8V
150
FAN1950D18 Ripple Rejection (PSRR)
Cout = 10µF Ceramic
Ch1 – Vout (AC, 0.5V/div.) Ch2 – Load Current (1A/div.)
2.550
2.525
Vout vs. Temperature (°C)
(10 mA Load)
2.500
2.475
2.450
-50
-25 0 25 50 75 100 125 150
Junction Temperature (°C)
Iout = 10 mA; Vout = 2.5V
FAN1950D25 Ripple Rejection (PSRR)
Vin = 5V
Vin = 3V
Vin = 3V and 5V Vout = 1.8V Iload = 1A
Cin = Cout = 10µF/ 6.3V Tantalum
PSRR – 10dB/div
Vin = 5V Vout = 2.5V Iload = 1A
Cin = Cout = 10µF/ 6.3V Tantalum
PSRR – 10dB/div
REV. 0.1.6 8/30/04
7
7페이지 | |||
구 성 | 총 11 페이지수 | ||
다운로드 | [ FAN1950D25X.PDF 데이터시트 ] |
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부품번호 | 상세설명 및 기능 | 제조사 |
FAN1950D25X | 1.5A Low-Voltage Low-Dropout Regulator | Fairchild Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |