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RT6203B Datasheet(PDF) 3 Page - Richtek Technology Corporation

Part No. RT6203B
Description  5A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter with VID Control
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Maker  RICHTEK [Richtek Technology Corporation]
Homepage  http://www.richtek.com
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 3 page
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RT6203B
3
DS6203B-01 July 2017
www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Functional Block Diagram
Operation
The RT6203B is a high-performance 700kHz 5Astep-down
regulator with internal power switches and synchronous
rectifiers. It features an Advanced Constant On-Time
(ACOTTM) control architecture that provides stable
operation with ceramic output capacitors without
complicated external compensation, among other benefits.
The ACOTTM control mode also provides fast transient
response, especially for low output voltages and low duty
cycles. The input voltage range is from 4.5V to 18V and
the output is adjustable from 0.8V to 8V. The proprietary
ACOTTM control scheme improves upon other constant
on-time architectures, achieving nearly constant switching
frequency over line, load, and output voltage ranges. The
RT6203B are optimized for ceramic output capacitors.
Since there is no internal clock, response to transients is
nearly instantaneous and inductor current can ramp quickly
to maintain output regulation without large bulk output
capacitance.
Constant On-Time (COT) Control
The heart of any COT architecture is the on-time one shot.
Each on-time is a pre-determined “fixed” period that is
triggered by a feedback comparator. This robust
arrangement has high noise immunity and is ideal for low
duty cycle applications. After the on-time one-shot period,
there is a minimum off-time period before any further
regulation decisions can be considered. This arrangement
avoids the need to make any decisions during the noisy
time periods just after switching events, when the
switching node (SW) rises or falls. Because there is no
fixed clock, the high-side switch can turn on almost
immediately after load transients and further switching
pulses can ramp the inductor current higher to meet load
requirements with minimal delays. Traditional current
mode or voltage mode control schemes typically must
monitor the feedback voltage, current signals (also for
current limit), and internal ramps and compensation
signals, to determine when to turn off the high-side switch
Reg
UGATE
LGATE
Driver
BOOT
PVCC
Control
VIBIAS
On-Time
VIN
Min.
Off
VREF
Comparator
SS
SW
PGND
EN
PVCC
OC
+
-
6µA
VREG5
UV & OV
VIN
Comparator
+
-
VREF
7bits
PGOOD
VS
SW
DAC OUT
EN
FB
PVCC
VCC
ZC
Serial
Interface
Chip
Address
01101A1A0
EXT
INT
EXT
INT
92.5%
DAC OUT EXT
INT
DAC OUT
SDA
SCL
A0
A1
AGND
DAC
VOUT = 0.72V
to 1.48V
+




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