RT2652 Step-Down Converter Datasheet

RT2652 Datasheet, PDF, Equivalent


Part Number

RT2652

Description

1.2MHz Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 12 Pages
Datasheet
Download RT2652 Datasheet


RT2652
®
RT2652
2A, 1.2MHz Synchronous Step-Down Converter
General Description
The RT2652 is a high efficiency synchronous, step-down
DC-DC converter. The available input voltage range is from
2.7V to 5.5V the regulated output voltage is adjustable
from 0.6V to VIN while delivering up to 2A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The switching frequency is
fixed internally at 1.2MHz. The 100% duty cycle provides
low dropout operation extending battery life in portable
systems. Current mode operation with internal
compensation allows the transient response to be
optimized. The RT2652 is available in the WDFN-10L 3x3
package.
Ordering Information
RT2652
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
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
High Efficiency : Up to 95%
Fixed Frequency : 1.2MHz
No Schottky Diode Required
Internal Compensation
0.6V Reference Allows Low Output Voltage
100% Duty Cycle for Low Dropout Operation
OCP, UVP, OTP
RoHS Compliant and Halogen Free
Applications
Enterprise Servers
Ethernet Switches & Routers
Global Storage
Telecom & Industrial
Cell Phones & DSC's
Pin Configuration
(TOP VIEW)
EN 1
VIN 2
VIN 3
AGND 4
FB 5
10 PGND
9 PGND
8 LX
7 LX
11 6 AGND
WDFN-10L 3x3
Marking Information
0K= : Product Code
0K=YM
DNN
YMDNN : Date Code
Simplified Application Circuit
RT2652
VIN VIN LX
EN FB
AGND PGND
VOUT
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS2652-03 March 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT2652
RT2652
Functional Pin Description
Pin No.
Pin Name
Pin Function
1 EN Enable Control Input. Pull high to turn on. Do not float.
2, 3 VIN
Power Input. Decouple this pin to GND with a 22F ceramic capacitor at least.
4, 6
AGND
Analog Ground.
5
FB
Feedback Voltage Input. This pin receives the feedback voltage from an external
resistive divider connected across the output.
7, 8 LX
9, 10,
11 (Exposed Pad)
PGND
Power MOSFET Switch Node. Connect this pin to the inductor.
Power Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Functional Block Diagram
EN EN POR
0.6V
OSC
Slope
Comp.
EA Output
FB Clamp
SS
ISEN
OC Limit
0.2V
UV
Control Logic
Driver
AGND
OTP
NISEN
N-MOSFET Limit
VIN
LX
PGND
Operation
The RT2652 is a monolithic, constant-frequency, current
mode step-down DC-DC converter. During normal
operation, the internal high side MOSFET is turned on at
the beginning of each cycle. Current in the inductor
increases until the peak inductor current reaches the value
defined by the internal error amplifier. The error amplifier
adjusts the voltage of its output by comparing the feedback
signal from a resistor divider on the FB pin with an internal
0.6V reference. When the load current increases, it causes
a reduction in the feedback voltage relative to the reference.
The error amplifier raises its output voltage until the average
inductor current matches the new load current. When the
high side MOSFET turns off, the synchronous power
switch (N-MOSFET) turns on until either the bottom current
limit is reached or the beginning of the next cycle. The
operating frequency is set by the internal oscillator at
1.2MHz. In VIN larger than 6V condition, the high side
MOSFET is turned off and the low side MOSFET is
switched on until either the VIN over voltage condition is
cleared or the low side MOSFET's current limit is reached.
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2652-03 March 2017


Features ® RT2652 2A, 1.2MHz Synchronous Step-D own Converter General Description The RT2652 is a high efficiency synchronous , step-down DC-DC converter. The availa ble input voltage range is from 2.7V to 5.5V the regulated output voltage is a djustable from 0.6V to VIN while delive ring up to 2A of output current. The in ternal synchronous low on-resistance po wer switches increase efficiency and el iminate the need for an external Schott ky diode. The switching frequency is fi xed internally at 1.2MHz. The 100% duty cycle provides low dropout operation e xtending battery life in portable syste ms. Current mode operation with interna l compensation allows the transient res ponse to be optimized. The RT2652 is av ailable in the WDFN-10L 3x3 package. Or dering Information RT2652 Package Type QW : WDFN-10L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are :  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use i.
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