DS8813D Datasheet, PDF (2/23 Pages) Richtek Technology Corporation – Multi-Phase PWM Controller with PWM-VID Reference

RT8813D
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
(Exposed Pad)
Pin Name
BOOT1
UGATE1
EN
PSI
VID
REFADJ
REFIN
VREF
TON
RGND
VSNS
ILIM
TSNS
ISEN3
TALERT
ISEN2
VCC
ISEN1
PGOOD
UGATE2
BOOT2
PHASE2
LGATE2
PVCC
PWM3
LGATE1
PHASE1
GND
Pin Function
Bootstrap supply for PWM 1. This pin powers the high side MOSFET driver.
High side gate driver of PWM 1. This pin provides the gate drive for the converter's
high side MOSFET. Connect this pin to the Gate of high side MOSFET.
Enable control input. Active high input.
Power saving interface. When the voltage is pulled below 0.4V, the device will
operate into 1 phase DEM. When the voltage is between 0.8V to 1V, the device will
operate into 1 phase force CCM. When the voltage is between 1.4V to 5.5V, the
device will operate into active phase force CCM (only for 2 or 3 phase).
Programming output voltage control input. Refer to PWM-VID Dynamic Voltage
Control.
Reference adjustment output. Refer to PWM-VID dynamic voltage control.
External reference input.
Reference voltage output. This is a high precision voltage reference (2V) from VREF
pin to RGND pin.
On-time/switching frequency adjustment input. Connect a 100pF capacitor between
C_TON and ground is optional for noise immunity enhancement.
Negative remote sense input. Connect this pin to the ground of output load.
Positive remote sense input. Connect this pin to the positive terminal of output load.
Current limit setting. Connect a resistor from ILIM pin to GND to set the current limit
threshold.
Temperature sensing input for 2/1 phase operation.
Phase 3 current sense input for 3 phase operation.
Thermal alert. Active low open drain output for 2/1 Phase Operation.
Phase 2 current sense input for 3 phase operation.
Supply voltage input for 2/1 phase operation. (Connect to PVCC)
Phase 1 current sense input for 3 phase operation. (Connect to PHASE1)
Power good indicator output. Active high open drain output.
High side gate driver of PWM 2. This pin provides the gate drive for the converter's
high side MOSFET. Connect this pin to the Gate of high side MOSFET.
Bootstrap supply for of PWM 2. This pin powers the high side MOSFET driver.
Switch node for PWM2. This pin is return node of the high side driver of PWM 2.
Connect this pin to the Source of high side MOSFET together with the Drain of low
side MOSFET and the inductor.
Low side gate driver of PWM 2. This pin provides the gate drive for the converter's
low side MOSFET. Connect this pin to the Gate of low side MOSFET.
Supply voltage input. Connect this pin to a 5V bias supply. Place a high quality
bypass capacitor from this pin to GND.
Third phase PWM control signal output to driver for 3 phase operation. In 2/1 Phase
Operation, this pin is high impedance.
Low side gate driver of PWM 1. This pin provides the gate drive for the converter's
low side MOSFET. Connect this pin to the Gate of low side MOSFET.
Switch node for PWM1. This pin is return node of the high side driver of PWM 1.
Connect this pin to the Source of high side MOSFET together with the Drain of low
side MOSFET and the inductor.
Ground. The Exposed pad should be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS8813D-00 September 2016