FAN5037M

FAN5037M Datasheet

FAN5037

Part	Datasheet
FAN5037M	FAN5037M (pdf)

Related Parts	Information
FAN5037MX	FAN5037MX

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FAN5037 Adjustable Switching Regulator Controller • High power switch-mode DC-DC controller can provide in excess of 13A • Output voltage adjustable from 1.2V to 3.6V • 85% • Cumulative accuracy < 3% over line, load, and temperature variations • Overvoltage and short circuit protection • Built-in soft start • No overshoot at turn-on • I/O and AGP power for desktop computers • High power for ASICs • High power for DSPs • Adjustable step-down power supplies The FAN5037 is a high power, switch-mode DC-DC controller that provides power for all low-voltage applications. 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 as high as 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 components in order to achieve the tight tolerance voltage regulation 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 5V VCCA 2 Feedback Control +12V +5V IFBL 4 IFBH 3 VCCP 8 CEXT 1 Oscillator Digital Logic Vout 1.20V Reference GNDP 6 VFB 5 FAN5037 Pin Assignments CEXT VCCA IFBH IFBL FAN5037 VCCP DRV GNDP VFB PRODUCT SPECIFICATION Pin Descriptions Pin Name CEXT VCCA IFBH IFBL VFB GNDP DRV VCCP Pin Number 4 5 6 7 Pin Function Description External capacitor. A 180pF capacitor is connected to this pin as part of the constant on-time pulse width circuit. Careful layout of this pin is critical to system performance. See Applications Information for details. Analog Vcc. Power supply for regulator control circuitry and voltage reference. Connect to system 5V supply and decouple to ground with 0.1µF ceramic capacitor. High side current feedback. Pins 3 and 4 are used as the inputs for the current feedback control loop and as the short circuit current sense points. Careful layout of the traces from these pins to the current sense resistor is critical for optimal performance of the short circuit protection scheme. See Applications Information for details. Low side current feedback. See Applications Information for details. Voltage feedback. Using two external resistors, this pin sets the output voltage level for the switching regulator. 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: 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. 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. 9/26/01 0.0m 001 Stock#DS30005037 2001 Fairchild Semiconductor Corporation

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FAN5037

Adjustable Switching Regulator Controller
• High power switch-mode DC-DC controller can provide in excess of 13A
• Output voltage adjustable from 1.2V to 3.6V
• 85%
• Cumulative accuracy < 3% over line, load, and
temperature variations
• Overvoltage and short circuit protection
• Built-in soft start
• No overshoot at turn-on
• I/O and AGP power for desktop computers
• High power for ASICs
• High power for DSPs
• Adjustable step-down power supplies

The FAN5037 is a high power, switch-mode DC-DC controller that provides power for all low-voltage applications. 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 as high as 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 components in order to achieve the tight tolerance voltage regulation 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
5V VCCA 2

Feedback Control
+12V +5V

IFBL 4 IFBH 3 VCCP 8

CEXT 1

Oscillator

Digital Logic

Vout
1.20V Reference

GNDP 6

VFB 5

FAN5037

Pin Assignments

CEXT VCCA

IFBH IFBL

FAN5037

VCCP DRV GNDP VFB

PRODUCT SPECIFICATION

Pin Descriptions

Pin Name CEXT

VCCA IFBH

IFBL VFB GNDP DRV

VCCP

Pin Number
4 5 6 7

Pin Function Description

External capacitor. A 180pF capacitor is connected to this pin as part of the constant on-time pulse width circuit. Careful layout of this pin is critical to system performance. See Applications Information for details.

Analog Vcc. Power supply for regulator control circuitry and voltage reference. Connect to system 5V supply and decouple to ground with 0.1µF ceramic capacitor.

High side current feedback. Pins 3 and 4 are used as the inputs for the current feedback control loop and as the short circuit current sense points. Careful layout of the traces from these pins to the current sense resistor is critical for optimal performance of the short circuit protection scheme. See Applications Information for details.

Low side current feedback. See Applications Information for details.

Voltage feedback. Using two external resistors, this pin sets the output voltage level for the switching regulator.
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:

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.

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.
9/26/01 0.0m 001 Stock#DS30005037 2001 Fairchild Semiconductor Corporation

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Datasheet ID: FAN5037M 513905