RT6285 Step-Down Converter Datasheet

RT6285 Datasheet, PDF, Equivalent


Part Number

RT6285

Description

500kHz Asynchronous Step-Down Converter

Manufacture

Richtek

Total Page 17 Pages
Datasheet
Download RT6285 Datasheet


RT6285
®
RT6285
5A, 30V, 500kHz Asynchronous Step-Down Converter
General Description
The RT6285 is a step-down regulator with an internal power
MOSFET. It achieves 5A of continuous output current over
a wide input supply range with excellent load and line
regulation. Current mode operation provides fast transient
response and eases loop stabilization.
For protection, the RT6285 provides cycle-by-cycle current
limiting and thermal shutdown protection. The soft-start
reduces the stress on the input source at startup. In
shutdown mode, the regulator draws only 25μA of supply
current.
The RT6285 requires a minimum number of readily
available external components, providing a compact
solution. The RT6285 is available in the SOP-8 (Exposed
Pad) package.
Ordering Information
RT6285
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
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
5A Output Current
Internal Soft-Start
110mΩ Internal Power MOSFET Switch
Internal Compensation Minimizes External Parts
Count
High Efficiency up to 90%
25μA Shutdown Mode
Fixed 500kHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 5.5V to 30V Operating Input Range
Adjustable Output Voltage from 1.222V to 24V
Available In an SOP8 (Exposed Pad) Package
Integrated Boot Recharge FET
RoHS Compliant and Halogen Free
Applications
Distributive Power Systems
Battery Charger
DSL Modems
Pre-regulator for Linear Regulators
Pin Configuration
(TOP VIEW)
BOOT
NC
NC
FB
8
2 GND 7
36
9
45
SW
VIN
GND
EN
SOP-8 (Exposed Pad)
Simplified Application Circuit
VIN
CIN
Chip Enable
Open = Automatic
Startup
VIN BOOT
RT6285
EN SW
GND
FB
CBOOT
L1
D1
CFF R1
VOUT
COUT
R2
Copyright ©2020 Richtek Technology Corporation. All rights reserved.
DS6285-00 March 2020
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

RT6285
RT6285
Marking Information
RT6285
GSPYMDNN
RT6285GSP : Product Number
YMDNN : Date Code
Functional Pin Description
Pin No.
1
2, 3
4
5
6,
9 (Exposed Pad)
7
8
Pin Name
BOOT
NC
FB
EN
GND
VIN
SW
Pin Function
High side gate drive boost Input. BOOT supplies the drive for the high side
N-MOSFET switch. Connect a 10nF or greater capacitor from SW to BOOT to
power the high side switch.
No internal connection.
Feedback input. The feedback threshold is 1.222V.
Enable input. EN is a digital input that turns the regulator on or off. Drive EN
higher than 1.4V to turn on the regulator, lower than 0.4V to turn it off. For
automatic startup, leave EN unconnected.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Power input. A suitable large capacitor should be bypassed from VIN to GND to
eliminate noise on the input to the IC.
Power switching output. Note that a capacitor is required from SW to BOOT to
power the high side switch.
Functional Block Diagram
VIN
VCC
1µA
Ramp
Generator
Current Sense
Amplifier -
+
EN
Regulator
Oscillator
500kHz
S
Q Driver
+
R
Reference
Error
VREF + Amplifier
-
PWM
Comparator
FB - VCOMP
12k 400k 30pF
Bootstrap
Control
13pF
BOOT
SW
GND
Copyright ©2020 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS6285-00 March 2020


Features ® RT6285 5A, 30V, 500kHz Asynchronous Step-Down Converter General Descriptio n The RT6285 is a step-down regulator w ith an internal power MOSFET. It achiev es 5A of continuous output current over a wide input supply range with excelle nt load and line regulation. Current mo de operation provides fast transient re sponse and eases loop stabilization. Fo r protection, the RT6285 provides cycle -by-cycle current limiting and thermal shutdown protection. The soft-start red uces the stress on the input source at startup. In shutdown mode, the regulato r draws only 25μA of supply current. T he RT6285 requires a minimum number of readily available external components, providing a compact solution. The RT628 5 is available in the SOP-8 (Exposed Pa d) package. Ordering Information RT6285 Package Type SP : SOP-8 (Exposed Pad-O ption 1) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richt ek products are :  RoHS compliant an d compatible with the current requirements of IPC/JEDEC J-STD-020. .
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