FAN6520AIMX Fairchild Semiconductor, FAN6520AIMX Datasheet - Page 2

• Manufacturer Part Number: FAN6520AIMX
• Description: IC CTRLR PWM SGL SYNC BUCK 8SOIC
• Manufacturer: Fairchild Semiconductor
• Type: Step-Down (Buck)r

Specifications of FAN6520AIMX

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 5.5 V
• Frequency - Switching: 300kHz
• Voltage - Input: 4.5 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 715mW
• Topology: Boost, Buck
• Output Voltage: 0.8 V to 5.5 V
• Switching Frequency: 340 KHz
• Duty Cycle (max): 100 %
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Synchronous Pin: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

© 2005 Fairchild Semiconductor Corporation
FAN6520A Rev. 1.0.5
Pin Configuration
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
OCSET/SD
COMP/
Name
BOOT
HDRV
LDRV
GND
VCC
SW
FB
Bootstrap Supply Input. Provides a boosted voltage to the high-side MOSFET driver.
Connect to bootstrap capacitor, as shown in Figure 1.
High-Side Gate-Drive Output. Connect to the gate of the high-side power MOSFET(s).
This pin is monitored by the adaptive shoot-through protection circuitry to determine when
the upper MOSFET has turned off.
Ground. The signal and power ground for the IC. Tie this pin to the ground island/plane
through the lowest impedance connection available. Connect directly to source of low-side
MOSFET(s).
Low-Side Gate-Drive Output. Connect to the gate of the low-side power MOSFET(s).
This pin is monitored by the adaptive shoot-through protection circuitry to determine when
the lower MOSFET has turned off.
VCC. Provides bias power to the IC and the drive voltage for LDRV. Bypass with a ceramic
capacitor as close to this pin as possible.
Feedback. This pin is the inverting input of the internal error amplifier. Use this pin, in com-
bination with the COMP/OCSET pin, to compensate the voltage-control feedback loop of
the converter.
Compensation / Over-Current Set Point / Shut Down. This is a multiplexed pin. During
operation, the output of the error amplifier drives this pin. During a short period of time fol-
lowing power-on reset (POR), this pin is used to determine the over-current threshold of the
converter. Pulling COMP/OCSET to a level below 0.8V disables the controller. Disabling the
controller causes the oscillator to stop, the HDRV and LDRV outputs to be held low, and the
soft-start circuitry to restart.
Switch Node Input. The SW pin provides return for the high-side bootstrapped driver, is a
sense point for the adaptive shoot-through protection, and is used to monitor the drop
across the upper MOSFET’s R
BOOT
HDRV
LDRV
GND
FAN6520AM 8-Pin SOIC Package
1
2
3
4
FAN6520A
2
DS(ON)
for current limit. Connect as shown in Figure 1.
Description
8
7
6
5
SW
COMP/OCSET/SD
FB
VCC
www.fairchildsemi.com