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Fairchild Semiconductor Electronic Components Datasheet

FAN6520B Datasheet

Single Synchronous Buck PWM Controller

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FAN6520B pdf
February 2006
FAN6520B
Single Synchronous Buck PWM Controller
www.DataSheet4U.com
Features
Accepts 1.5V to 5V for VIN
Output Range 0.8V to VIN
– 0.8V Internal Reference
– ±1.5% Over Line Voltage and Temperature
Drives N-Channel MOSFETs
Simple Single-Loop Control Design
– Voltage-Mode PWM Control
Fast Transient Response
– High-Bandwidth Error Amplifier
– Full 0% to 100% Duty Cycle
Small Converter Size
– 300kHz Fixed Frequency Oscillator
– Internal Soft-Start
– 8-Lead SOIC
Applications
Power Supplies for PC Subsystems and Peripherals
MCH, GTL, and AGP Supplies
Cable Modems, Set Top Boxes, and DSL Modems
DSP, Memory
Low-Voltage Distributed Power Supplies
ACPI Power Control
5V Input DC-DC Regulator
Description
The FAN6520B makes simple work out of implementing
a complete control and protection scheme for a DC-DC
stepdown converter.
Designed to drive N-channel MOSFETs in a synchro-
nous buck topology, the FAN6520B integrates the con-
trol, output adjustment, and monitoring functions into a
single 8-lead package.
The FAN6520B is easy to use, employs a single feed-
back loop, and voltage-mode control with fast transient
response. The output voltage can be precisely regulated
to as low as 0.8V, with a maximum tolerance of ±1.5%
over temperature and line voltage variations. A fixed fre-
quency oscillator reduces design complexity, while bal-
ancing typical application cost. The error amplifier
features a 15MHz gain-bandwidth product and an 8V/µs
slew rate which enables high converter bandwidth for
fast transient performance. The resulting PWM duty
cycles range from 0% to 100%.
The FAN6520B is rated for operation from 0° to +70°C
with the FAN6520BI rated from –40° to +85°C.
Ordering Information
Part Number
FAN6520BM
FAN6520BMX
FAN6520BIM
FAN6520BIMX
Temperature Range
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
Package
SOIC-8
SOIC-8
SOIC-8
SOIC-8
Packing
Rails
Tape and Reel
Rails
Tape and Reel
©2006 Fairchild Semiconductor Corporation
FAN6520B Rev. 1.0.3
1
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

FAN6520B Datasheet

Single Synchronous Buck PWM Controller

No Preview Available !

FAN6520B pdf
Pin Configuration
BOOT
HDRV
GND
LDRV
18
27
FAN6520B
36
45
SW
COMP/SD
FB
VCC
FAN6520BM 8-pin SOIC Package
Pin Definitions
Pin #
1
2
3
4
5
6
7
8
Pin Name
BOOT
HDRV
GND
LDRV
VCC
FB
COMP/SD
SW
Pin Function Description
Bootstrap Supply Input. Provides a boosted voltage to the high-side MOSFET driver.
Connect to bootstrap capacitor and diode as shown in Figure 1.
High Side Gate Drive Output. Connect to the gate of the high-side power MOSFET(s).
This pin is also 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 also 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 good
quality ceramic capacitor (X7R or X5R) as close to this pin as possible.
Feedback. This pin is the inverting input of the internal error amplifier. Use this pin, in
combination with the COMP pin, to compensate the voltage-control feedback loop of the
converter.
COMP/SD. This is a multiplexed pin. During operation, the output of the error amplifier
drives this pin. Pulling COMP 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 re-arm. Connect a 75kresistor between VCC and COMP/SD pin to
pull up.
Switch Node Input. Connect as shown in Figure 1. The SW pin provides return for the
high-side bootstrapped driver, is a sense point for the adaptive shoot-thru protection.
FAN6520B Rev. 1.0.3
2
www.fairchildsemi.com


Part Number FAN6520B
Description Single Synchronous Buck PWM Controller
Maker Fairchild Semiconductor
Total Page 14 Pages
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FAN6520B pdf
FAN6520B Datasheet PDF
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