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PDF FAN5037 Data sheet ( Hoja de datos )
| Número de pieza | FAN5037 | |
| Descripción | Adjustable Switching Regulator Controller | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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www.fairchildsemi.com
FAN5037
Adjustable Switching Regulator Controller
Features
• High power switch-mode DC-DC controller can provide
in excess of 13A
• Output voltage adjustable from 1.2V to 3.6V
• 85% efficiency
• Cumulative accuracy < 3% over line, load, and
temperature variations
• Overvoltage and short circuit protection
• Built-in soft start
• No overshoot at turn-on
Applications
• I/O and AGP power for desktop computers
• High efficiency power for ASICs
• High efficiency power for DSPs
• Adjustable step-down power supplies
Description
The FAN5037 is a high power, switch-mode DC-DC control-
ler that provides efficient power for all low-voltage applica-
tions. This controller has a built-in Soft Start feature which
offers system protection during power-up by reducing both
inrush current and output overshoot. When combined with
the appropriate external circuitry, the FAN5037 can deliver
load currents as high as 13A at efficiencies as high as 88%.
The FAN5037 can generate output voltages from 1.2V up to
3.6V using external resistors.
The FAN5037 is designed to operate in a constant on-time
control mode under all load conditions. Its accurate low TC
reference eliminates the need for precision external compo-
nents in order to achieve the tight tolerance voltage regula-
tion required by many applications. Short circuit current
protection is provided through the use of a current sense
resistor, while overvoltage protection is provided internally.
Block Diagram
FAN5037
CEXT
1
Oscillator
1.20V
Reference
5V
VCCA 2
Feedback Control
Digital Logic
+12V +5V
IFBL 4
IFBH 3
VCCP 8
7
DRV
GNDP 6
VFB 5
Vout
REV. 1.0.3 9/26/01
1 page  
PRODUCT SPECIFICATION
Typical Operating Characteristics (continued)
Output Startup, System Power-Up
Pin 7 (DRV), 10A Load
FAN5037
Time (5ms/division)
Pin 7 (DRV), 0.1A Load
Time (1µs/division)
Time (1µs/division)
Application Circuit
+5V
+12V
C1
0.1µF
C7
0.1uF
Optional
L1
2.5µH
R1
47Ω C5
C6
180pF
+C2
1200µF
D2
MMBD4148
D3
1N4735A
+C3 +C4
1200µF 1200µF
Q1
C8 0.1µF
FDB6030L
L2 R3
1µF 4.7µH 5.2mΩ
R2 4.7Ω
18
2 U1 7
3 FAN5037 6
45
D1
MBRB1545CT
REV. 1.0.3 9/26/01
Figure 1. 13A at 3.3V Application Schematic
VCORE
R4
3.48KΩ
+... + C14
1500µF
R5
2KΩ
5
5 Page 
FAN5037
Ordering Information
Product Number
FAN5037M
Package
8 pin SOIC
PRODUCT SPECIFICATION
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 reason-
ably expected to cause the failure of the life support device
or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
9/26/01 0.0m 001
Stock#DS30005037
2001 Fairchild Semiconductor Corporation
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet FAN5037.PDF ] | |
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