RT8230A/B/C/D/E
3
DS8230A/B/C/D/E-04 February 2014 www.richtek.com
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Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Functional Pin Description
Pin No. Pin Name Pin Function
1 FB1
Feedback Voltage Input for Channel 1. Connect FB1 to a resistive voltage
divider from VOUT1 to GND to adjust output from 2V to 5.5V.
2 ENTRIP1
Enable and Current Limit Setting for Channel 1. There is an internal 5A
current source to the ENTRIP1 pin. Connect a resistor to GND to set the
threshold between 0.2V and 3V for channel 1 current limit. The GND
PHASE1 current limit threshold is 1/10th the voltage on the ENTRIP1 pin.
3 TON
Switching Frequency Setting. Connect a resistor to GND to adjust switching
frequency.
4 ENTRIP2
Enable and Current Limit Setting for Channel 2. There is an internal 5A
current source to the ENTRIP2 pin. Connect a resistor to GND to set the
threshold between 0.2V and 3V for channel 2 current limit. The GND
PHASE2 current limit threshold is 1/10th the voltage on the ENTRIP2 pin.
5 FB2
Feedback Voltage Input for Channel 2. Connect FB2 to a resistive
voltage-divider from VOUT2 to GND to adjust output from 2V to 4V.
6 PGOOD Power Good Output for Channel 1 and Channel 2. (Logical AND)
7 BOOT2
Bootstrap Supply for Channel 2 High-Side Gate Driver. Connect to an external
capacitor according to the typical application circuits.
8 UGATE2 Gate Drive Output for Channel 2 High-Side MOSFET.
9 PHASE2
Switch Node of Channel 2 MOSFETs. PHASE2 is the return rail for the
UGATE2 high-Side gate driver.
10
LGATE2
(RT8230A/B/E)
Gate Drive Output for Channel 2 Low-Side MOSFET.
LGATE2
(RT8230C/D)
Gate Drive Output for Channel 2 Low-Side MOSFET and Charge Pump CLK.
The CLK frequency will become fast to pull up charge pump voltage when the
SECFB voltage is low to 2V.
11 VIN Supply Voltage Input.
12
ENLDO
(RT8230A/B/D)
Master Enable Control Input. The LDO5/LDO3 are enabled if it is within logic
high level and disable if it is less than the logic low level.
ENC
(RT8230C/E)
Master Enable Control Input. The channels are enabled if it is within logic high
level and disable if it is less than the logic low level.
13
ENM
(RT8230A)
Mode Selection with Enable Control Input. Pull up to LDO5 (Ultrasonic mode)
or LDO3 (DEM) to turn on both switch channels. Short to GND for shutdown.
SECFB
(RT8230B/C/D/E)
Feedback Voltage Input for Charge Pump. The SECFB is used to monitor the
optional external 14V charge pump. Connect a resistive voltage divider from
14V charge pump output to GND to detect the output.
14 LDO5
5V Linear Regulator Output. It is also the supply voltage for the low-side
MOSFET driver and analog supply control circuits.
15 LDO3 3.3V Linear Regulator Output.
16
LGATE1
(RT8230A/C/D)
Gate Drive Output for Channel 1 Low-Side MOSFET.
LGATE1
(RT8230B/E)
Gate Drive Output for Channel 1 Low-Side MOSFET and Charge Pump CLK.
The CLK frequency will become fast to pull up charge pump voltage when the
SECFB voltage is low to 2V.
