DC-DC Controller. RT2702 Datasheet


RT2702 Controller. Datasheet pdf. Equivalent


Part Number

RT2702

Description

Step-Down DC-DC Controller

Manufacture

Richtek

Total Page 20 Pages
Datasheet
Download RT2702 Datasheet


RT2702
Sample &
Buy
®
RT2702
Step-Down DC-DC Controller with Remote Sense
General Description
The RT2702 is a high-efficiency and high-current
synchronous buck controller designed to drive a DrMOS
module. A COT (Constant-On-Time) PWM controller and
PWM signal for DrMOS are integrated so that the external
circuit is easily designed and the component count is
reduced. The RT2702 adopts FCOT control technology
that responds instantly to input voltage change. Besides,
the RT2702 includes a 5V (VDRV) linear regulator, which
can provide 5V voltage and supply up to 100mA for DrMOS.
The RT2702 supports two modes transition function with
various operating states, which include audio skipping
mode (ASM) and forced-CCM mode (FCCM).
Other features include power good indication, external soft-
start setting, soft-off discharge function, precise DCR
sense, enable/disable control, over-voltage protection
(OVP), under-voltage protection (UVP), current Limit,
thermal shutdown into the WQFN-16L 3x3 package.
Ordering Information
RT2702
()
Pin 1 Orientation***
(2) : Quadrant 2, Follow EIA-481-D
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
***Empty means Pin1 orientation is Quadrant 1
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Features
4.5V to 19V Input Voltage Range
Adjustable Output Range, 0.6V Reference with 1%
Accuracy Over-Temperature Protection
FCOTTM (Flexible Constant On Time) Control
Integrated 5V LDO@100mA for DrMOS module
Support Pre-biased Output
Programmable Soft-Start
Soft-Off through VOUT Discharge
Programmable Switching Frequency
Programmable Over Current Limit
Power Good Indication
OVP, UVP, UVLO Protection
Applications
High Current Distributed Power Systems
Datacom and Telecom Systems
Industrial Power Supplies
Pin Configuration
(TOP VIEW)
16 15 14 13
MODE
PWM
DISB
THWN
1
2
3
4
GND
17
12 EN
11 POK
10 ILIM
9 SS
5 678
WQFN-16L 3x3
Marking Information
8H= : Product Code
8H=YM
DNN
YMDNN : Date Code
Copyright ©2019 Richtek Technology Corporation. All rights reserved.
DS2702-02 May 2019
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT2702
RT2702
Functional Pin Description
Pin No
1
2
Pin Name
Pin Function
MODE
Operation mode detection input.
PWM
Logic gate driver. This pin provides PWM signal for the gate drive.
3
DISB
External driver enable. Enable external driver when DISB is high, and disable
external driver when DISB is low.
4
THWN
Thermal shutdown detection input. DISB goes low when THWN is less than
trip level.
5
CSP
Non-inverting input of current sense amplifier.
Inverting input of current sense amplifier. Connect a RCS from this pin to the
6
CSN
current sensing R/C network for adjusting the over current trip threshold. VOUT is
also discharged by this pin when system is shut down or any protection is
toggled. Resistance of the discharge switch is around 30.
7 FB Feedback pin. This pin is the negative input node of the PWM comparator.
8
RGND
Remote ground sense. This pin is intended to connect to the negative side of the
load for remote sensing.
External soft-start pin. Achieve programmable soft-start time function, also have
9
SS
a default internal soft-start time 3ms for minimum soft-start time. DO NOT force
this pin lower than 1.2V, otherwise soft-start procedure won't be finished. Refer
to “Application Information” for further description.
10
ILIM
The 1.2V buffered output for current limit adjustment. Connect a RILIM between
this pin and GND to set the over-current threshold corresponding to RCS.
11
POK
Open drain power good indicator. High impedance indicates power is good.
Enable control input. The device enters its 20A supply current shutdown mode
if EN is less than the EN input falling edge trip level and does not restart until EN
12 EN is greater than the EN input rising edge trip level. Connect EN to VIN for
automatically startup. EN can be connected to VIN through a resistive voltage
divider to implement a programmable under-voltage lockout.
On-time/switching frequency adjustment input. Connect a resistor to VIN for
13
TON
adjusting switching frequency. And connect an another 100pF ceramic capacitor
between TON and ground is optional for noise immunity enhancement.
14 VIN Power supply input.
15
PHASE
Switching node Input for zero current detection. Also provide VOUT information
through PHASE pin to on-time generation circuit.
16 VDRV
17 (Exposed Pad) GND
Output bypass for the 5V regulator. Connect a low-ESR bypass ceramic
capacitor of 4.7F from this pin to GND.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
Copyright ©2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2702-02 May 2019


Features Sample & Buy ® RT2702 Step-Down DC-DC Controller with Remote Sense General D escription The RT2702 is a high-efficie ncy and high-current synchronous buck c ontroller designed to drive a DrMOS mod ule. A COT (Constant-On-Time) PWM contr oller and PWM signal for DrMOS are inte grated so that the external circuit is easily designed and the component count is reduced. The RT2702 adopts FCOT con trol technology that responds instantly to input voltage change. Besides, the RT2702 includes a 5V (VDRV) linear regu lator, which can provide 5V voltage and supply up to 100mA for DrMOS. The RT27 02 supports two modes transition functi on with various operating states, which include audio skipping mode (ASM) and forced-CCM mode (FCCM). Other features include power good indication, external softstart setting, soft-off discharge function, precise DCR sense, enable/dis able control, over-voltage protection ( OVP), under-voltage protection (UVP), c urrent Limit, thermal shutdown into the WQFN-16L 3x3 package. O.
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