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AN-8036 

APPLICATION NOTE 

© 2010 Fairchild Semiconductor Corporation 

 

www.fairchildsemi.com 

Rev. 1.0.0  •  3/31/10 

 

Related Datasheets 

FAN5353 — 3MHz, 3A TinyBuck™ Synchronous Buck Regulator 

FAN5354 — 3MHz, 3A TinyBuck™ Synchronous Buck Regulator 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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, or (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 significant injury to the user. 

2.  A critical component is 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. 

 

 

Summary of Contents for AN-8036

Page 1: ...stalled on the board to ensure tight regulation low ripple and excellent transient response The FAN5353 54 evaluation board provides probe access points to all key circuit nodes so that electrical characteristics can be measured Quick Start Connection Guide 1 Connect VIN input power supply as shown in Figure 1 2 ENABLE Jumper J1 factory installed 3 Connect the external load between VOUT and PGND 4...

Page 2: ...AN 8036 APPLICATION NOTE 2010 Fairchild Semiconductor Corporation www fairchildsemi com Rev 1 0 0 3 31 10 2 Schematic Figure 2 Schematic Diagram ...

Page 3: ...E51L DigiKey 490 3905 1 CVCC 1 4 7µf 6 3V 20 X5R 0603 Murata GRM188R60J475M Digikey 490 3297 1 R3 R6 R8 3 20K 5 0603 DigiKey P20K G R5 1 1Ω 5 0603 DigiKey P1 0 G R9 1 0Ω 5 0603 DigiKey P0 0 G R7 1 1 0K 5 0603 DigiKey P1 0K G R1 1 100K 1 0603 DigiKey P100K H R2 1 200K 1 0603 DigiKey P200K H SW VIN VIN_S 11 1x1 Header Strip 125C DigiKey SAM1098 01 VOUT VOUT_S VREF PGND 2 AGND 3 J1 1 3x1 Header Strip...

Page 4: ...L DigiKey 490 3905 1 CVCC 1 4 7µF 6 3V 20 X5R 0603 Murata GRM188R60J475M Digikey 490 3297 1 R3 R6 R8 3 20K 5 0603 DigiKey P20K G R5 1 1Ω 5 0603 DigiKey P1 0 G R4 R7 2 1 0K 5 0603 DigiKey P1 0K G R1 1 100K 1 0603 DigiKey P100K H R2 1 200K 1 0603 DigiKey P200K H SW VIN VIN_S 11 1x1 Header Strip 125C DigiKey SAM1098 01 VOUT VOUT_S VREF PGND 2 AGND 3 J1 J2 2 3x1 Header Strip 125C DigiKey SAM1098 03 EN...

Page 5: ...AN 8036 APPLICATION NOTE 2010 Fairchild Semiconductor Corporation www fairchildsemi com Rev 1 0 0 3 31 10 5 Figure 3 FAN5354 PCB Top Layer ...

Page 6: ...pad 2 counting from the bottom is an open drain connected to VIN through a pull up resistor indicating that the IC is in regulation when its state is HIGH Output Voltage Setting The output voltage is factory preset to 1 2V since R1 100kΩ and R2 200kΩ To set a different VOUT R2 should be replaced with another resistor calculated according to 8 0 V 8 0 1 R 2 R OUT 1 Optional Load Resistors Two power...

Page 7: ...HERS 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 or c whose failure ...

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