FAN1950D25X [FAIRCHILD]
1.5A Low-Voltage Low-Dropout Regulator; 1.5A低压低压降稳压器
| 型号： | FAN1950D25X |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | 1.5A Low-Voltage Low-Dropout Regulator |
| 文件： | 总11页 (文件大小：518K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN1950/FAN1951
1.5A Low-Voltage Low-Dropout Regulator
Features
General Description
• 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
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.
• Low ground current
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.
Applications
• General purpose conversion for low-voltage CPUs,
DSP and FPGAs
• SMPS post regulator
• Cable/Satellite set-top boxes
• PCI Graphics adapter cards
Typical Application
FAN1950-2.5V
FAN1951-1.8V
2.5V
10µF
3.0V
2.5V
1.8V
10µF
IN OUT
IN OUT
GND
100KΩ
Error Output
On/Off
FLAG
EN
GND
REV. 0.1.6 8/30/04
FAN1950/FAN1951
Pin Assignments
FAN1950Dx
FAN1951Dx
FRONT VIEW
FRONT VIEW
1
2
3
1
2
3
4
5
3-Lead Plastic
5-Lead Plastic
TO-252 (DPAK)
TO-252 (DPAK)
Pin Descriptions
Pin Number
FAN1950 FAN1951
Pin Name
Pin Function Description
NA
1
EN
Enable (Input) – TTL/CMOS compatible input. Logic HIGH enables
the output
1
2
2
3
4
5
IN
Input Supply Voltage
GND
OUT
FLAG
Ground. This pin and TAB are ground.
Output Voltage
3
NA
Error Flag (Output). Open-collector output. Active-low indicates an
output fault condition.
2
REV. 0.1.6 8/30/04
FAN1950/FAN1951
Absolute Maximum Ratings
Absolute maximum ratings are the values beyond which the device may be damaged or have its useful life impaired.
Functional operation under these conditions is not implied.
Parameter
Min.
-0.2
-0.2
-0.2
–55
–65
Typ.
Max.
15
Units
V
Supply Voltage: IN
Enable Voltage: EN
FLAG voltage: FLAG
15
V
15
V
Junction Temperature (T )
J
150
150
300
°C
°C
°C
W
Storage Temperature
Lead Soldering Temperature, 10 seconds
Power Dissipation (P )
Internally
Limited
D
Recommended Operating Conditions
Parameter
Conditions
Min.
Typ.
Max.
Units
Supply Voltage
2.25
14
V
Package Thermal Resistance (θ
)
JC
TO-252
3
°C/W
°C
Junction Operating Temperature
-40
125
Electrical Specifications
(V = V
IN OUT
+ 1V, V = 2.5V, T = +25°C unless specified otherwise)
EN
j
The • denotes specifications which apply over the full operating temperature range.
Parameter
Conditions
Min.
Typ.
Max. Units
Output Voltage (V
) Tolerance 10mA ≤ I
10mA ≤ I
≤ 1.0A,
≤ 1.5A,
•
•
-2
-2.5
2
2.5
%
OUT
OUT
OUT
+ 1V ≤ V ≤ 8V
IN
V
OUT
Line Regulation1,2
Load Regulation1,2
I
= 10mA, V
+ 1V ≤ V ≤ 14V
.06
0.2
0.5
1
%
%
OUT
OUT
IN
V
= V + 1V,
OUT
IN
10mA ≤ I
≤ 1.5A
OUT
Dropout Voltage3
Ground Current
I
= 1.5A, ∆V
= -1%
350
mV
OUT
OUT
•
•
500
20
I
I
= 750mA
= 1.5A
10
20
mA
mA
OUT
OUT
Minimum Load Current
Current Limit
V
OUT
V
OUT
+ 1V ≤ V ≤ 8V
IN
•
•
5
10
mA
A
= 0V, V = V
IN
+ 1V
2.5
OUT
EN Input Voltage (FAN1951 only)
V
IH
V
IL
(On)
(Off)
•
•
2.25
V
V
0.8
EN Input Current (FAN1951 only)
I , V
IH EN
I , V
IL EN
= 2.25V
= 0.8V
•
•
30
4
µA
µA
FLAG Threshold Voltage
(FAN1951 only)
Low threshold, % V
High threshold, % V
Hysteresis
93
1
%
%
%
OUT
OUT
99.2
2
FLAG Output Leakage Current4
(FAN1951 only)
V
FLAG
= 14V
•
•
µA
FLAG Output-Low Voltage
(FAN1951 only)
I
= 250µA
400
mV
OL
REV. 0.1.6 8/30/04
3
FAN1950/FAN1951
Parameter
Conditions
Min.
Typ.
150
10
Max. Units
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Shutdown output current
Notes:
°C
°C
V
EN
≤ 0.8V, V ≤ 8V, V
IN OUT
= 0V
•
20
µA
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 = V – V
IN OUT
when V
OUT
decreases to 98% of its nominal output voltage with V = V + 1V. For output
IN OUT
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 V
.
IN
4
REV. 0.1.6 8/30/04
FAN1950/FAN1951
Typical Performance Characteristics
Dropout Voltage vs. Output Current
Dropout Voltage vs. Temperature
0.6
0.5
0.4
0.3
0.2
0.1
0
0.6
IL = 1.5A
0.5
+125°C
+75°C
0.4
IL = 1A
-40°C
0.3
-10°C
0.2
+25°C
0.1
0
0.5
0.7
0.9
1.1
1.3
1.5
-50
0
50
100
150
Tj
Load Current (A)
Vout = 2.5V, 1.8V, Iout = 1A, 1.5A
Ground Current vs. Load Current
Ground Current vs. Supply Voltage
Vin = Vout + 1V, 25°C
Vin = Vout + 1V, 25°C
25.00
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
20.00
15.00
10.00
5.00
I gnd (mA)
0.00
0
5
10
15
20
0
500
1000
1500
2000
Vin (V)
Iout = 10mA
Load Current (mA)
REV. 0.1.6 8/30/04
5
FAN1950/FAN1951
Typical Performance Characteristics (continued)
Ground Current vs. Temperature
Vin = 3V
30.00
25.00
IGND_ @ 1.5A
20.00
15.00
IGND @ 750mA
10.00
5.00
IGND_@10mA
0.00
-50
0
50
100
150
Temperature (C)
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)
Vin = 3V, Vout = 1.8V
Ch.1 – Vout (1V/div) Ch.2 – Load Current (2A/div)
FAN1950D25 Short-Circuit Recovery Response
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
FAN1950/FAN1951
Typical Performance Characteristics (continued)
Load Transient Response
Load Transient Response
Vin=2.5V, Vout=1.8V, Cin=10µF Ceramic
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.)
Cout = 10µF Ceramic
Ch1 – Vout (AC, 0.5V/div.) Ch2 – Load Current (1A/div.)
Vout vs. Temperature
Vout vs. Temperature (°C)
1.834
2.550
(10 mA Load)
1.824
1.814
1.804
1.794
1.784
1.774
1.764
2.525
2.500
2.475
2.450
-100
-50
0
50
100
150
-50
-25
0
25
50 75 100 125 150
Junction Temperature (°C)
Iout = 10 mA; Vout = 1.8V
Junction Temperature (°C)
Iout = 10 mA; Vout = 2.5V
FAN1950D25 Ripple Rejection (PSRR)
FAN1950D18 Ripple Rejection (PSRR)
Vin = 5V
Vin = 3V
Vin = 5V Vout = 2.5V Iload = 1A
Cin = Cout = 10µF/ 6.3V Tantalum
PSRR – 10dB/div
Vin = 3V and 5V Vout = 1.8V Iload = 1A
Cin = Cout = 10µF/ 6.3V Tantalum
PSRR – 10dB/div
REV. 0.1.6 8/30/04
7
FAN1950/FAN1951
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).
Input and Output Capacitor Requirements
A 4.7µF or greater Input Capacitor (Ceramic or Tanta-
lum), installed closely between V and GND leads of
IN
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.
Aluminum electrolytic capacitors also can be used if
their ESR is below 3Ω.
FAN1950 and FAN1951, as most of LDO regulators,
require an Output Capacitor. The recommended value
of this capacitor is 10µF. The larger capacitor will
8
REV. 0.1.6 8/30/04
FAN1950/FAN1951
Mechanical Dimensions
5-Lead TO-252 DPAK Package
6.00 MIN
A
6.80
6.35
5.64
5.04
1.27
0.50
6.56 MIN
6.30
5.90
6.25
1.02
0.60
3.00 MIN
1
C
3
5
2
4
1
1.27
3.81
1.27
(0.44)
1.00
0.57 0.07
0.69 0.15
1.27
0.25 M A M C
LAND PATTERN RECOMMENDATION
5.08
B
2.40
2.18
0.60
0.40
(5.09)
(4.05)
10.42
9.20
SEE
DETAIL A
3
5
4
2
1
0.10 B
GAGE PLANE
0.60
0.40
0.51
(1.54)
NOTES: UNLESS OTHERWISE SPECIFIED
A) ALL DIMENSIONS ARE IN MILLIMETERS.
B) THIS PACKAGE CONFORMS TO JEDEC, TO-252,
ISSUE C, VARIATION AA, DATED NOV. 1999.
1.78
1.40
10°
0°
0.13 MAX
SEATING PLANE
(2.90)
DETAIL A
(ROTATED 90°)
SCALE: 2X
REV. 0.1.6 8/30/04
9
FAN1950/FAN1951
Mechanical Dimensions
3-Lead TO-252 DPAK Package
A
6.73
6.35
6.00 MIN
5.46
5.21
L3
4
6.50 MIN
3.00 MIN
D
6.25
1.02
0.64
C
2
1
3
1
3
1.14
0.76
2.30
1.40 MIN
(0.59)
0.89
0.64
4.60
2.29
4.57
E1
M
M
C
0.25
A
LAND PATTERN RECOMMENDATION
B
2.39
2.18
SEE
NOTE D
0.58
0.46
4
D1
10.41
9.40
SEE
DETAIL A
2
1
3
0.10
B
NOTES: UNLESS OTHERWISE SPECIFIED
0.51
GAGE PLANE
A) ALL DIMENSIONS ARE IN MILLIMETERS.
B) THIS PACKAGE CONFORMS TO JEDEC, TO-252,
ISSUE C. VARIATION AA & AB, DATED NOV. 1999.
0.61
0.46
(1.54)
C) DIMENSIONING AND TOLERANCING PER
ASME Y14.5–1994.
10°
0°
D) HEAT SINK TOP EDGE COULD BE IN CHAMFERED
CORNERS OR EDGE PROTRUSION.
1.78
1.40
E) DIMENSIONS L3, D, E1 & D1 TABLE:
0.127 MAX
SEATING PLANE
OPTION AA OPTION AB
L3 0.89 – 1.27 1.52 – 2.03
(2.90)
D
5.97 – 6.22 5.33 – 5.59
DETAIL A
E1 4.32 MIN
D1 5.21 MIN
3.81 MIN
4.57 MIN
(ROTATED –90°)
SCALE 12X
10
REV. 0.1.6 8/30/04
FAN1950/FAN1951
Ordering Information
Part Number
FAN1951D18X
FAN1951D25X
FAN1950D25X
Output Voltage
1.8V
Package
5 Lead TO-252 DPAK in Tape and Reel
5 Lead TO-252 DPAK in Tape and Reel
3 Lead TO-252 DPAK in Tape and Reel
2.5V
2.5V
Note: Please contact sales for other voltage and package options.
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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8/30/04 0.0m 005
Stock#DS30001950
2003 Fairchild Semiconductor Corporation
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