RT8035 Datasheet, PDF (2/11 Pages) Richtek Technology Corporation – Dual 800mA, 1.25MHz Synchronous Step-Down Converter

RT8035
Typical Application Circuit
V_IN1
V_IN2
RT8035
8 _VIN1
C_IN1
4.7µF
3 _VIN2
C_IN2
4.7µF
Chip Enable
1 _EN1
6 _EN2
4, 9
11 (Exposed Pad)
GND
L1
LX1 ^{10 2.2µH}
FB1 ²
L2
LX2 ^{5 2.2µH}
FB2 ⁷
C_FF1
C_FF2
R1
110k
R2
110k
R3
110k
R4
110k
V_OUT1
C_OUT1
10µF
V_OUT2
C_OUT2
10µF
Function Block Diagram
EN1/EN2
VIN1/VIN2
FB1/FB2
Slope
Compensation
Error
Amplifier
RC
COMP
OSC &
Shutdown
Control
Current
Sense
PWM
Comparator
Current
Limit
Detector
Control
Logic
UVLO &
Power Good
Detector
V_REF
RS1
Driver
LX1/LX2
RS2
GND
Functional Pin Description
Pin No.
1
2
3
5
6
7
8
10
Pin Name
EN1
FB1
VIN2
LX2
EN2
FB2
VIN1
LX1
Pin Function
Chip Enable of Channel 1 (Active High).
Feedback Input of Channel 1.
Power Supply Input of Channel 2.
Switching Node of Channel 2.
Chip Enable of Channel 2 (Active High).
Feedback Input of Channel 2.
Power Supply Input of Channel 1.
Switching Node of Channel 1.
4, 9, 11
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
(Exposed Pad) GND for maximum power dissipation.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8035-05 October 2012