RT8239A/B/C
Functional Pin Description
Pin No.
Pin Name
Pin Function
SMPS1 Feedback Input. Connect FB1 to a resistive voltage divider from SMPS1
output to GND for adjustable output from 2V to 5.5V.
1
FB1
Channel 1 Enable and Current Limit Setting Input. Connect resistor to GND to set
the threshold for Channel 1 synchronous R
sense. The GND-PHASE1
DS(ON)
2
3
4
ENTRIP1
TON
current limit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.5V to 3V
range. There is an internal 10μA current source from LDO5 to ENTRIP1. Leave
ENTRIP1 floating or drive it above 4.5V to shut down channel 1.
ON-Time/Frequency Adjustment Input. Connect to GND with 56kΩ to 100kΩ.
Channel 2 Enable and Current Limit Setting Input. Connect resistor to GND to set
the threshold for Channel 2 synchronous R
sense. The GND-PHASE2
DS(ON)
ENTRIP2
current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.5V to 3V
range. There is an internal 10μA current source from LDO5 to ENTRIP2. Leave
ENTRIP2 floating or drive it above 4.5V to shut down channel 2.
SMPS2 Feedback Input. Connect FB2 to a resistive voltage divider from SMPS2
output to GND for adjustable output from 2V to 5.5V.
5
6
FB2
Power Good Output for Channel 1 and Channel 2 (RT8239A).
PGOOD
Power Good Output for Channel 1, Channel 2 and SECFB (RT8239B/C).
Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor
according to the typical application circuits.
7
8
9
BOOT2
Upper Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and
BOOT2.
UGATE2
PHASE2
Switch Node for SMPS2. PHASE2 is the internal lower supply rail for the UGATE2
high side gate driver. PHASE2 is also the current sense input for the SMPS2.
10
11
LGATE2
VIN
Lower Gate Drive Output for SMSP2. LGATE2 swings between GND and LDO5.
Supply Input for LDO5.
Master Enable Input. LDO5/LDO3 is enabled if it is within logic high level and
disabled if it is less than the logic low level. Leave ENLDO floating to default
enable LDO5/LDO3.
12
13
ENLDO
ENM
(RT8239A)
Mode Selection with Enable Input. Pull up to LDO5 (Ultrasonic mode) or LDO3
(DEM) to turn on both switch Channels. Short to GND for shutdown.
Change Pump Feedback Pin. The SECFB is used to monitor the optional external
charge pump. Connect a resistive divider from the change pump output to GND to
detect the output. If SECFB drops below its feedback threshold, an ultrasonic
pulse occurs to refresh the charge pump driven by LGATE1 or LGATE2.
If SECFB drops below its UV threshold, the switcher channels stop working and
enter into discharge-mode. Pull up to LDO5 or LDO3 to disable SECFB UVP
function.
SECFB
(RT8239B/C)
5V Linear Regulator Output. LDO5 is the supply voltage for the low side MOSFET
driver and also the analog supply voltage for the device. Bypass a minimum 4.7μF
ceramic capacitor to GND
14
LDO5
3.3V Linear Regulator Output. Bypass a minimum 4.7μF ceramic capacitor to
GND.
15
16
17
LDO3
LGATE1
PHASE1
Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and LDO5.
Switch Node SMPS1. PHASE1 is the internal lower supply rail for the UGATE1
high side gate driver. PHASE1 is also the current sense input for the SMPS1.
Copyright 2012 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS8239A/B/C-06 October 2012
www.richtek.com
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