rt9206 Richtek Technology Corporation, rt9206 Datasheet - Page 5

• Manufacturer Part Number: rt9206
• Description: High Efficiency, Synchronous Buck With Dual Linear Controllers
• Manufacturer: Richtek Technology Corporation

Pin Description
LDRV1(Pin 1)
Linear controller 1 (LCTR1) driver. Connect to the gate of
external N-Channel MOSFET pass transistor to form a
positive linear regulator
VDD (Pin 2)
Input supply voltage
LDRV2 (Pin 3)
Linear controller 2 (LCTR2) driver. Connect to the gate of
external N-Channel MOSFET pass transistor to form a
positive linear regulator
LFB2 (Pin 4)
LDO2 feedback input. The feedback set point is 0.8V.
Connect to a resistive divider between the positive linear
regulator output and GND to adjust the output voltage.
COMP (Pin 5)
Switching regulator compensation pin.
FB (Pin 6)
Switching regulator feedback input. The feedback set point
is 0.8V. Connect to a resistive divider between the switching
regulator output and GND to adjust the output voltage.
PGOOD (Pin 7)
Open drain power good indicator. PGOOD is low when
switching regulator output voltage is lower than 10% of its
regulation voltage. Connect a pull high resistor between
PGOOD and switching regulator output for pull high logic
level voltage.
SS/EN (Pin 8)
Soft start input with 8uA sourcing current and IC enable
control.
RT (Pin 9)
Operational frequency setting. Connect a resistor between
RT and GND to set operational frequency. The operational
frequency will nominally run at 200kHz when open.
DS9206-11 March 2007
The formula between resistor setting and operational
frequency are as follows:
GND (Pin 10)
Ground
LGATE (Pin 11)
Low side gate driver. Drives low side N-MOSFET with a
voltage swing between VINT and GND
VINT (Pin 12)
Internal 6.0V regulator output. The low side gate driver and
control circuit and external bootstrap diode are powered
by this voltage. Decouple this pin to power ground with a
4.7uF or greater ceramic capacitor close to the VINT pin.
PHS (Pin 13)
Inductor connection with (-) terminal bootstrap flying
capacitor connection.
UGATE (Pin 14)
High side gate driver. Drives high side N-Channel MOSFET
with a voltage swing between BOOT and PHS
BOOT (Pin 15)
High side floating driver supply with (+) terminal bootstrap
flying capacitor connection. Voltage swing is from a diode
drop below VINT to VIN+VINT
LFB1 (Pin 16)
LDO1 feedback input. The feed back set point is 0.8V.
Connect to a resistive divider between the positive linear
regulator output and GND to adjust the output voltage.
R
RT
=
F
OSC
62 10
- 200 10
8
3
RT9206
www.richtek.com
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