Step-Down Converter. RT8072 Datasheet

RT8072 Converter. Datasheet pdf. Equivalent


Richtek RT8072
®
RT8072
5A, 2MHz, High Efficiency Synchronous Step-Down Converter
General Description
The RT8072 is a high efficiency PWM step-down converter
and capable of delivering 5A output current over a wide
input voltage range from 2.9V to 5.5V.
The RT8072 provides accurate regulation for a variety of
loads with an ±1% reference voltage at room temperature.
For reducing inductor size, it provides up to 2MHz
switching frequency. The efficiency is maximized through
the integrated 50mΩ for high side, 35mΩ for low side
MOSFETs and 250μA typical supply current.
The RT8072 features over current protection, frequency
fold back function in shorted circuit, hiccup mode under
voltage protection and over temperature protection.
The RT8072 is available in SOP-8 (Exposed Pad) and
WDFN-12L 3x3 packages.
Ordering Information
RT8072
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
QW : WDFN-12L 3x3 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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
z Integrated 50mΩ and 35mΩ MOSFETs
z 5A Output Current
z High Efficiency Up to 95%
z 2.9V to 5.5V Input Range
z Adjustable PWM Frequency : 300kHz to 2MHz
z 0.8V ±1% Reference Voltage
z Adjustable External Soft-Start
z Power Good Indicator (WDFN-12L 3x3 Only)
z Over Current Protection
z Under Voltage Protection
z Over Temperature Protection
z SOP-8 (Exposed Pad) and 12-Lead WDFN Packages
z RoHS Compliant and Halogen Free
Applications
z Low Voltage, High Density Power Systems
z Distributed Power Systems
z Point-of-Load Conversions
Marking Information
RT8072GSP
RT8072
GSPYMDNN
RT8072GSP : Product Number
YMDNN : Date Code
RT8072GQW
6C=YM
DNN
6C= : Product Code
YMDNN : Date Code
Simplified Application Circuit
VIN VIN BOOT
CIN RT8072
EN
COMP
RC RT
CC RT
GND
LX
FB
CBOOT
L
COUT
VOUT
RFB1
RFB2
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8072-01 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


RT8072 Datasheet
Recommendation RT8072 Datasheet
Part RT8072
Description High Efficiency Synchronous Step-Down Converter
Feature RT8072; ® RT8072 5A, 2MHz, High Efficiency Synchronous Step-Down Converter General Description The RT8072 .
Manufacture Richtek
Datasheet
Download RT8072 Datasheet




Richtek RT8072
RT8072
Pin Configurations
COMP
GND
EN
VIN
8
27
PGND
36
9
45
FB
RT
LX
BOOT
SOP-8 (Exposed Pad)
(TOP VIEW)
COMP 1
PGOOD 2
SS 3
EN 4
VIN 5
VIN 6
12 FB
11 RT
10 LX
9 LX
8 LX
13 7 BOOT
WDFN-12L 3x3
Functional Pin Description
Pin No.
SOP-8
(Exposed Pad)
WDFN-12L 3x3
Pin Name
1 1 COMP
2 -- GND
3 4 EN
4 5, 6 VIN
5 7 BOOT
6
8, 9, 10
LX
7 11 RT
8 12 FB
9
13
(Exposed Pad)
PGND
-- 2 PGOOD
-- 3 SS
Pin Function
Compensation Node.
Analog Ground.
Chip Enable. Externally pulled high to enable and pulled low to
disable this chip, and it is internally pulled up to high when the
pin is floating.
Power Input.
Bootstrap Supply for High Side Gate Driver.
Switch Node.
Frequency Setting.
Feedback Voltage Input.
Power Ground. The exposed pad must be shouldered to a
large PCB and connected to PGND for maximum power
dissipation.
Power Good Indicator with Open Drain Output. It is high
impedance when the output voltage is regulated. It is internally
pulled low when the chip is shutdown, thermal shutdown or
VIN is under UVLO threshold.
Soft-Start Control.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8072-01 November 2012



Richtek RT8072
Function Block Diagram
For SOP-8 (Exposed Pad) Package
RT8072
VIN
EN
GND
RT
FB
VIN
Internal
pull up
current
EN Threshold
Soft-Start
Voltage
Reference
Over Temperature
Protection
Shutdown
Control
UVLO
Current
Sense
Oscillator
Slope
Compensation
Error
Amplifier
Control
Logic
PWM
Comparator
Driver
BOOT
LX
PGND
COMP
For WDFN-12L 3x3 Package
VIN
EN
RT
SS
FB
PGOOD
VIN
Internal
pull up
current
EN Threshold
VIN
Soft-
Start
Voltage
Reference
Over Temperature
Protection
Shutdown
Control
Oscillator
UVLO
Current
Sense
Slope
Compensation
Error
Amplifier
Control
Logic
PWM
Comparator
Driver
Power Good
Threshold
BOOT
LX
PGND
COMP
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8072-01 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3







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