RT2701
Pin Configurations
(TOP VIEW)
RSET
VID
BOOT2
UGATE2
PHASE2
LGATE2
Marking Information
03= : Product Code
03=YM
DNN
18
17
16
15
14
13
YMDNN : Date Code
24 23 22 21 20 19
VSET
VREF
EN/MSEL
RMPSET
COMP
FB
1
2
3
4
5
6
7
8
9 10 11 12
PGND
25
VCC
VDD
LGATE1
PHASE1
UGATE1
BOOT1
Functional Pin Description
Pin No.
1
2
Pin Name
VSET
VREF
Pin Function
Output Voltage Setting. Connect a voltage divider from VREF to VSET to set the
output voltage.
Reference Voltage Output (2V). The RT2701 generates a 2V reference voltage
from VREF to VRTN.
Enable Control Input and Mode Selection. This pin is a tri-state input. Pull up this pin
to be higher than 4.2V, the controller operates in DEM mode. Pull up this pin to
between 1.2V to 3V, the controller operates in ASM mode. Pull down this pin to
GND, the controller will shutdown.
Internal Ramp Slew Rate Setting. Connect a resistor (R
RMP
) from RMPSET to GND
to the ramp slew rate. The value of R
RMP
must be set equal to R
TON
.
Compensation Node. This pin is the output node of the error amplifier.
Feedback Voltage Input. This pin is the negative input node of the error amplifier.
Remote Differential Feedback, Invert Input. This pin is the negative node of the
differential remote voltage sensing.
Switching Frequency Setting. Connect a resistor (R
TON
) from TON to VIN to set the
switching frequency. The value of R
TON
must be set equal to R
RMP
.
OCP Level Setting. Connect a resistor from OCP to GND to set the current limit
threshold.
Negative Input of Current Sensing.
Positive Input of Current Sensing.
Dynamic Phase Control Input. Connect a resistor from PS to GND to set the auto
down phase threshold.
Bootstrap Supply for High Side MOSFET Driver of Phase1.
High Side Gate Driver of Phase1. Connect this pin to the Gate of high side
MOSFET.
Return node of Phase1 High Side Driver. 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 Phase1. Connect this pin to the Gate of low side MOSFET.
3
EN/MSEL
4
5
6
7
8
9
10
11
12
13
14
15
16
RMPSET
COMP
FB
VRTN
TON
OCP
CSN
CSP
PS
BOOT1
UGATE1
PHASE1
LGATE1
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
VRTN
TON
OCP
CSN
CSP
PS
WQFN-24L 4x4
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS2701-00 May 2013
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
