Step-Down Converter. RT6203B Datasheet


RT6203B Converter. Datasheet pdf. Equivalent


Part Number

RT6203B

Description

Synchronous Step-Down Converter

Manufacture

Richtek

Total Page 22 Pages
Datasheet
Download RT6203B Datasheet


RT6203B
®
RT6203B
5A, 18V, 700kHz ACOTTM Synchronous Step-Down
Converter with VID Control
General Description
The RT6203B is an adaptive on-time mode synchronous
Buck converter. The main control loop of the RT6203B
uses an adaptive on-time mode control which provides a
very fast transient response with no external components.
The RT6203B operates from 4.5V to 18V VIN input. After
the initial power-up, the output voltage can be changed by
codes sent into the IC via an I2C compatible VID control
bus. There are special codes which can be used to program
current limit level and thermal shutdown level. Shutdown
and startup can be also programmed by special codes.
The device also features an adjustable soft-start time.
Output voltage is adjustable by resistor divider through
the FB pin between 0.8V to 8V.
Pin Configuration
(TOP VIEW)
Features
VID Control Range Via I2C Compatitable Interface :
0.72V to 1.48V in 10mV Steps
Adjustable Current Limit
Adjustable Thermal Shutdown
Fast Transient Response
Adjustable Output Voltage from 0.8V to 8V
Steady 700kHz Switching Frequency
Optimized for All Ceramic Capacitors
Externally-Adjustable, Pre-Biased Compatible Soft-
Start
Input Under-Voltage Lockout
Output Over- and Under-Voltage Protection
Power Good Output
Thermal Shutdown
RoHS Compliant and Halogen Free
20 19 18 17 16
PVCC
PGOOD
A0
A1
SCL
1
2
3
4
5
PGND
21
15 SW
14 SW
13 SW
12 PGND
11 PGND
6 7 8 9 10
Applications
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
WQFN-20L 4x4
Simplified Application Circuit
VIN
Power Good
Enable
I2C Control
C1
R3
C3
RT6203B
VIN VS
VCC
SW
PGOOD BOOT
PVCC
FB
SS
EN
SCL
SDA
A0
A1
PGND AGND
L1
C4 C5
R1 CFF
VOUT
R2
CSS
Address
Selection
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS6203B-01 July 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6203B
RT6203B
Marking Information
2G= : Product Code
2G=YM
DNN
YMDNN : Date Code
Ordering Information
RT6203B
Package Type
QW : WQFN-20L 4x4 (W-Type)
(Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Trim Operation
L : Latch-off
PWM/PSM Mode
B : PWM Mode
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.
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
PVCC
5V power supply output. Connect a capacitor (typical 1F) to AGND.
2
PGOOD
Open-drain power good indicator output.
3 A0 LSB of chip address. Tie to GND for 0, pull high for 1.
4 A1 LSB+1 of chip address. Tie to GND for 0, pull high for 1.
5
SCL
I2C clock input.
6
SDA
I2C data input.
7 SS Soft-start time setting. Connect an external capacitor to GND.
8
FB
Feedback voltage input. Connect to output voltage feedback resistor
divider.
9 VS Output voltage controlled by VID.
10
AGND
Analog ground.
11, 12,
21 (Exposed Pad)
PGND
Power ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum thermal dissipation.
13, 14, 15
SW
Switch node.
16, 17
VIN
Power input. Connect to high-side MOSFET Drain.
18
VCC
Power input for internal circuit.
19 EN Enable control Input.
Bootstrap supply for high-side gate driver. This capacitor is needed to drive
20
BOOT
the power switch's gate above the supply voltage. It is connected between
the SW and BS pins to form a floating supply across the power switch
driver. A 0.1F capacitor is recommended for use.
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6203B-01 July 2017


Features ® RT6203B 5A, 18V, 700kHz ACOTTM Synch ronous Step-Down Converter with VID Con trol General Description The RT6203B i s an adaptive on-time mode synchronous Buck converter. The main control loop o f the RT6203B uses an adaptive on-time mode control which provides a very fast transient response with no external co mponents. The RT6203B operates from 4.5 V to 18V VIN input. After the initial p ower-up, the output voltage can be chan ged by codes sent into the IC via an I2 C compatible VID control bus. There are special codes which can be used to pro gram current limit level and thermal sh utdown level. Shutdown and startup can be also programmed by special codes. Th e device also features an adjustable so ft-start time. Output voltage is adjust able by resistor divider through the FB pin between 0.8V to 8V. Pin Configurat ion (TOP VIEW) Features  VID Contro l Range Via I2C Compatitable Interface : 0.72V to 1.48V in 10mV Steps  Adju stable Current Limit  Adjustable Thermal Shutdown  Fast Transient .
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