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FAN1537のメーカーはFairchild Semiconductorです、この部品の機能は「Dual 1A Adjustable/Fixed Low Dropout Linear Regulators」です。 |
部品番号 | FAN1537 |
| |
部品説明 | Dual 1A Adjustable/Fixed Low Dropout Linear Regulators | ||
メーカ | Fairchild Semiconductor | ||
ロゴ | |||
このページの下部にプレビューとFAN1537ダウンロード(pdfファイル)リンクがあります。 Total 8 pages
www.fairchildsemi.com
FAN1537
Dual 1A Adjustable/Fixed Low Dropout
Linear Regulators
Features
• Low dropout voltage
• Load regulation: 0.05% typical
• On-chip thermal limiting
• SO-8 and 5-lead SPAK and TO-252 DPAK packages
• Fixed 3.3V, and adjustable or 2.5V or 1.8V fixed
• Stable with low ESR output capacitors
Applications
• Hard Disk Drives, CD-ROMs, DVDs
• High efficiency linear regulators
• Post regulators for switching supplies
• ADSL and Cable Modems
• 5V to 3.3V and 2.5V linear regulators
• Motherboard with multiple supplies
Description
The FAN1537 provides 2 output voltages: 3.3V, and either
adjustable or 2.5V or 1.8V fixed with 1.0A each output
current capability. These devices have been optimized for
low voltage where transient response and minimum input
voltage are critical.
Current limit features protect the outputs against short circuit
currents. On-chip thermal limiting provides protection
against any combination of overload and ambient tempera-
ture that would create excessive junction temperatures.
The FAN1537 series regulators are available in SO-8 and
5-lead SPAK and TO-252 DPAK power packages.
Typical Applications
VIN = 5V
22µF
+
FAN1537A
V1
VIN
V2
NC GND
3.3V at 1.0A
+
22µF
2.5V at 1.0A
+
22µF
VIN = 5V
22µF
+
FAN1537B
V1
VIN V2
GND FB
R1
54.9Ω
+
22µF
R2
124Ω
3.3V at 1.0A
1.8V at 1.0A
+
22µF
V2 = VREF (1 + R1/R2)
REV. 1.1.1 3/20/02
1 Page PRODUCT SPECIFICATION
FAN1537
Electrical Characteristics (Operating Conditions: VIN ≤ 7V, TJ=25°C unless otherwise specified.)
The • denotes specifications which apply over the specified operating temperature range of 0°C to 125°C junction temperature.
Parameter
Output Voltages
Conditions
10mA ≤ IOUT ≤ 1A
4.75V ≤ VIN ≤ 7V
Output Voltage
3.3V Output, VIN = 4.5V, IOUT = 1A
Time to Output Voltages Valid From VIN ≥ 4.75V
Reference Voltage, VREF
Line Regulation1,2
(both outputs)
Load Regulation1,2
(both outputs)
10mA ≤ IOUT ≤ 1A
4.75V ≤ VIN ≤ 7V
4.75V ≤ VIN ≤ 7V, IOUT = 10mA
VIN = 4.75V, 10mA ≤ IOUT ≤ 1A
Dropout Voltage
(3.3V output)
∆VOUT = 1%, IOUT = 1A
Current Limit
(both outputs)
VIN = 5V
Minimum Load Current
(both outputs)
4.75V ≤ VIN ≤ 7V
Quiescent Current
Ripple Rejection3
(both outputs)
VIN = 7V
f = 120Hz, COUT = 22µF Tantalum,
VIN = 5V, IOUT = 1A
Long-Term Stability
TA = 125°C, 1000 hrs.
RMS Output Noise (% of VOUT) TA = 25°C, 10Hz ≤ f ≤ 10kHz
Thermal Resistance, Junction to SO-8
Case
TO-252 DPAK
SPAK
Thermal Shutdown
Thermal Shutdown Hysteresis Junction Temperature
Min. Typ. Max. Units
1.764 1.8 1.836
• 1.742 1.8 1.858
2.450 2.500 2.550
• 2.420 2.500 2.580
3.234 3.300 3.366
• 3.200 3.300 3.400
V
• 3.2
V
5 msec
1.225 1.250 1.275 V
• 1.210 1.250 1.290
• 0.005 0.5 %
• 0.05 0.5 %
• 1.100 1.300 V
• 1.3 1.5
A
• 10
mA
•
60
6 15 mA
dB
0.03
0.003
50
3
2
155
10
1.0 %
%
°C/W
°C/W
°C/W
°C
°C
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. 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. ESR = 0.2Ω.
4. For adjust only, VOUT = VREF (1 + R1/R2)
REV. 1.1.1 3/20/02
3
3Pages FAN1537
Mechanical Dimensions
5-Lead SPAK
PRODUCT SPECIFICATION
Symbol
A
B
b1
b2
C
c1
c2
D
E
e
L
L1
L2
L3
R
α
Inches
Min. Max.
0.350 0.360
0.220 NOM
0.268
0.025 0.031
0.070 0.080
0.040 0.050
0.010 NOM
0.295 NOM
0.365 0.375
0.067
0.410 0.420
0.031 0.041
0.350 0.360
0.310 0.320
0.010 NOM
0° 8°
Millimeters
Min. Max.
8.89 9.14
5.59 NOM
6.81
0.63 0.79
1.78 2.03
1.02 1.27
0.25 NOM
7.49 NOM
9.27 9.52
1.72
10.41 10.67
0.79 1.04
8.89 9.14
7.87 8.13
0.25 NOM
0° 8°
Notes
Notes:
1. All linear dimensions are in inches (millimeters).
2. This drawing is subject to change without notice.
3. The center lead is in electrical contact with the thermal tab.
4. Dimensions do not include mold protrusions, not to exceed 0.006 (0,15).
E
C
A c1
B c2
D
L
L2
L3
1
e
b1
5
b2
0.010 (0,25) M
Thermal Ta b
(See Note 3)
Seating Plane
0.004 (0,10)
0.005 (0.13)
0.001 (0.03)
R
Gage Plane
L1
3°–6°
6 REV. 1.1.1 3/20/02
6 Page | |||
ページ | 合計 : 8 ページ | ||
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PDF ダウンロード | [ FAN1537 データシート.PDF ] |
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
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