FDS6670AS View Datasheet(PDF) - Richtek Technology
Part Name
Description
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FDS6670AS Datasheet PDF : 18 Pages
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RT8298
Functional Pin Description
Pin No.
WDFN-14L 4x3
SOP-8
(Exposed Pad)
Pin Name
Pin Function
Feedback Input. This pin is connected to the converter output. It
1
6
FB
is used to set the output of the converter to regulate to the
desired value via an external resistive divider. The feedback
reference voltage is 0.808V typically.
Power Good Indicator with Open Drain. (for RT8298ZQW only)
2
--
PGOOD
A 100kΩ pull-high resistor is needed. The output of this pin is
pulled to low when the FB is lower than 0.75V; otherwise it is
high impedance.
Enable or External Frequency Synchronization Input. A
logic-high (2V < EN < 5.5V) enables the converter; a logic-low
3
7
EN/SYNC forces the IC into shutdown mode reducing the supply current to
less than 3μA. For external frequency synchronization operation,
the available frequency range is from 300kHz to 1.5MHz.
4, 5, 6
Power Input. The available input voltage range is from 4.5V to
8
VIN
24V. A 22μF or larger input capacitor is needed to reduce
voltage spikes at the input.
7
--
NC
No Internal Connection.
8, 9, 10
Switching Node. Output of the internal high side MOSFET.
1
SW
Connect this pin to external low-side N-MOSFET, inductor and
bootstrap capacitor.
11
2
BOOT
Bootstrap for High side Gate Driver. Connect a 1μF ceramic
capacitor between the BOOT pin and SW pin.
12
3
VCC
BG Driver Bias Supply. Decouple with a 1μF X5R/X7R ceramic
capacitor between the VCC pin and GND.
13
4
BG
14,
5,
15 (Exposed Pad) 9 (Exposed Pad)
GND
Gate Driver Output. Connect this pin to the gate of the external
low-side N-MOSFET.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum thermal dissipation.
Copyright ©2011 Richtek Technology Corporation. All rights reserved.
DS8298-01 November 2011
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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