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  Richtek Technology Electronic Components Datasheet  

RT8298A Datasheet

600kHz Step-Down Converter

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®
RT8298A
6A, 24V, 600kHz Step-Down Converter with Synchronous
Gate Driver
General Description
The RT8298A is a synchronous step-down DC/DC converter
with an integrated high side internal power MOSFET and
a gate driver for a low side external power MOSFET. It
can deliver up to 6A output current from a 4.5V to 24V
input supply. The RT8298A's current mode architecture
allows the transient response to be optimized over a wider
input voltage and load range. Cycle-by-cycle current limit
provides protection against shorted outputs and soft-start
eliminates input current surge during start-up. The
RT8298A is synchronizable to an external clock with
frequency ranging from 300kHz to 1.5MHz.
The RT8298A is available in SOP-8 (Exposed Pad)
packages.
Ordering Information
RT8298A
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
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
4.5V to 24V Input Voltage Range
6A Output Current
45mΩ Internal High Side N-MOSFET
Current Mode Control
600kHz Switching Frequency
Adjustable Output from 0.8V to 15V
Up to 95% Efficiency
Internal Compensation
Stable with Ceramic Capacitors
Synchronous External Clock : 300kHz to 1.5MHz
Cycle-by-Cycle Current Limit
Input Under Voltage Lockout
Output Under Voltage Protection
Power Good Indicator
Thermal Shutdown Protection
Force PWM Turn On
RoHS Compliant and Halogen Free
Applications
Point of Load Regulator in Distributed Power System
Digital Set top Boxes
Personal Digital Recorders
Broadband Communications
Flat Panel TVs and Monitors
Simplified Application Circuit
RT8298A
VIN
VIN
BOOT
CIN
SW
VCC
BG
CVCC
FB
Chip Enable
EN/SYNC
GND
CBOOT
L
Q1
VOUT
R1
COUT
R2
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8298A-00 July 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8298A Datasheet

600kHz Step-Down Converter

No Preview Available !

RT8298A
Marking Information
RT8298A
GSPYMDNN
RT8298AGSP : Product Number
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
SW
BOOT
VCC
BG
8
2
7
GND
3
6
9
4
5
VIN
EN/SYNC
FB
GND
SOP-8 (Exposed Pad)
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
SW
Switching Node. Output of the internal high side MOSFET. Connect this pin to
external low-side N-MOSFET, inductor and bootstrap capacitor.
2
BOOT
Bootstrap for High side Gate Driver. Connect a 1F ceramic capacitor between the
BOOT pin and SW pin.
3
VCC
BG Driver Bias Supply. Decouple with a 1F X5R/X7R ceramic capacitor between
the VCC pin and GND.
4
BG
Gate Driver Output. Connect this pin to the gate of the external low-side
N-MOSFET.
5,
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to GND
for maximum thermal dissipation.
Feedback Input. This pin is connected to the converter output. It is used to set the
6
FB
output of the converter to regulate to the desired value via an external resistive
divider. The feedback reference voltage is 0.808V typically.
Enable or External Frequency Synchronization Input. A logic-high (2V < EN <
5.5V) enables the converter; a logic-low forces the IC into shutdown mode
7
EN/SYNC reducing the supply current to less than 3A. For external frequency
synchronization operation, the available frequency range is from 300kHz to
1.5MHz.
8
VIN
Power Input. The available input voltage range is from 4.5V to 24V. A 22F or
larger input capacitor is needed to reduce voltage spikes at the input.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8298A-00 July 2014


Part Number RT8298A
Description 600kHz Step-Down Converter
Maker Richtek
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RT8298A Datasheet PDF






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