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RT6206A の電気的特性と機能

RT6206AのメーカーはRichtekです、この部品の機能は「Synchronous Step-Down Converter」です。


製品の詳細 ( Datasheet PDF )

部品番号 RT6206A
部品説明 Synchronous Step-Down Converter
メーカ Richtek
ロゴ Richtek ロゴ 




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RT6206A Datasheet, RT6206A PDF,ピン配置, 機能
®
RT6206A
5.5A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter
General Description
The RT6206Ais a synchronous step-downDC/DC converter
with Advanced Constant On-Time (ACOTTM) mode control.
It achieves high power density to deliver up to 5.5A output
current from a 4.5V to 18V input supply. The proprietary
ACOTTM mode offers an optimal transient response over a
wide range of loads and all kinds of ceramic capacitors,
which allows the device to adopt very low ESR output
capacitor for ensuring performance stabilization. In
addition, RT6206A keeps an excellent constant switching
frequency under line and load variation and the integrated
synchronous power switches with the ACOTTM mode
operation provides high efficiency in whole output current
load range. Cycle-by-cycle current limit provides an
accurate protection by a valley detection of low side
MOSFET and external soft-start setting eliminates input
current surge during startup. Protection functions include
thermal shutdown for RT6206A.
The RT6206A are available in the SOP-8 (Exposed Pad)
and WDFN-10L 3x3 packages.
Ordering Information
RT6206A
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Trim Operation
H : Hiccup
Features
z ACOTTM Mode Enables Fast Transient Response
z 4.5V to 18V Input Voltage Range
z 5.5A Output Current
z 35mΩ Internal Low Side N-MOSFET
z Advanced Constant On-Time Control
z Support All Ceramic Capacitors
z Up to 95% Efficiency
z Adjustable Output Voltage from 0.765V to 8V
z Adjustable Soft-Start
z Cycle-by-Cycle Current Limit
z Input Under-Voltage Lockout
z Thermal Shutdown
z RoHS Compliant and Halogen Free
Applications
z Industrial and Commercial Low Power Systems
z Computer Peripherals
z LCD Monitors and TVs
z Green Electronics/Appliances
z Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
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.
Simplified Application Circuit
VIN
Enable
Power Good
RT6206A
VIN SW
EN
PGOOD*
BOOT
FB
GND
VOUT
VREG5
SS
* : PGOOD pin for WDFN-10L 3x3 only.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS6206A-00 June 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1

1 Page





RT6206A pdf, ピン配列
Function Block Diagram
VREG5
BOOT
EN
POR &
Reg
Min.
Off-Time VREG5
VBIAS
VREF
OC
Control
Driver
UV & OV
VREG5
SW
Ripple
ZC
Gen.
6µA
SS
+ Comparator
VIN
FB
-
-
Comparator
FB
0.9 x VREF
-
+
FB On-Time
RT6206A
VIN
SW
GND
PGOOD*
* : PGOOD pin for WDFN-10L 3x3 only.
Operation
The RT6206A is a synchronous step-down converter with
advanced constant on-time control mode. Using the
ACOTTM control mode can reduce the output capacitance
and provide fast transient response. It can minimize the
component size without additional external compensation
network.
Internal Regulator
The regulator provides 5V power to supply the internal
control circuit. Connecting a 1μF ceramic capacitor for
decoupling and stability is required.
Soft-Start
In order to prevent the converter output voltage from
overshooting during the startup period, the soft-start
function is necessary. The soft-start time is adjustable
and can be set by an external capacitor.
UVLO Protection
To protect the chip from operating at insufficient supply
voltage, the UVLO is needed. When the input voltage of
VIN is lower than the UVLO falling threshold voltage, the
device will be latch-off.
Thermal Shutdown
When the junction temperature exceeds the OTP
threshold value, the IC will shut down the switching
operation. Once the junction temperature cools down and
is lower than the OTP lower threshold, the converter will
automatically resume switching
Power Good (for WDFN-10L 3x3 only)
After soft-start is finished, the power good function will be
activated. When the FB is activated, the PGOOD will
become an open-drain output. If the FB is below, the
PGOOD pin will be pulled low.
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS6206A-00 June 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3


3Pages


RT6206A 電子部品, 半導体
RT6206A
Typical Application Circuit
VIN C1
10µF x 2
Input Signal
Power Good
C2
0.1µF
RT6206A
VIN SW
BOOT
EN FB
R3
100k
C4
1µF
PGOOD*
VREG5
GND
SS
* : PGOOD pin for WDFN-10L 3x3 only.
L1
1.4µH
C6
0.1µF
C3 R1
8.25k
VOUT
1.05V/5.5A
C7
22µF x 2
C5
3.3nF
R2
22k
VOUT (V)
1
1.05
1.2
1.8
2.5
3.3
5
7
Table 1. Suggested Component Values (VIN = 12V)
R1 (kΩ)
R2 (kΩ)
C3 (pF)
L1 (μH)
6.81
22.1
--
1.4
8.25
22.1
--
1.4
12.7
22.1
--
1.4
30.1
22.1
5 to 22
2
49.9
22.1
5 to 22
2
73.2
22.1
5 to 22
2
124
22.1
5 to 22
3.3
180
22.1
5 to 22
3.3
C7 (μF)
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
www.richtek.com
6
is a registered trademark of Richtek Technology Corporation.
DS6206A-00 June 2014

6 Page



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共有リンク

Link :


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RT6206A

Synchronous Step-Down Converter

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