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  Richtek Technology Electronic Components Datasheet  

RT7239 Datasheet

(RT7235 - RT7240) Synchronous Step-Down Converter

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®
RT7235/36/39/40
5A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter
General Description
The RT7235/36/39/40 is a synchronous step-down DC/
DC converter with Advanced Constant On-Time (ACOTTM)
mode control. It achieves high power density to deliver up
to 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, RT7235/36/39/40 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 RT7235/36/39/40, output Under
Voltage Protection (UVP) / Over Voltage Protection (OVP)
for RT7235/36. When the UVP/OVP is triggered, the device
will enter latch mode for TSSOP-14 (Exposed Pad), and
hiccup mode for WDFN-10L 3x3.
The RT7235/36 are available in TSSOP-14 (Exposed Pad)
and WDFN-10L 3x3 packages, and the RT7235 is operated
in forced continuous conduction mode.
The RT7239/40 are available in the SOP-8 (Exposed Pad)
package, and the RT7239 is operated in forced continuous
conduction mode.
Features
z ACOTTM Mode Enables Fast Transient Response
z 4.5V to 18V Input Voltage Range
z 5A Output Current
z 35mΩ Internal Low Site N-MOSFET
z Advanced Constant On-Time Control
z Support All Ceramic Capacitors
z Up to 95% Efficiency
z 650kHz Switching Frequency at all Load Current
(RT7235, RT7239)
z Discontinuous Operating Mode at Light Load
(RT7236, RT7240)
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
Simplified Application Circuit
VIN
Enable
Power GOOD
RT7235/36/39/40
VIN SW
VCC*
EN
PGOOD*
BOOT
FB
PGND
VOUT
* : VCC pin for TSSOP-14 (Exposed Pad) only.
VS pin for TSSOP-14 (Exposed Pad) only.
VREG5
VS*
SS GND*
GND pin for TSSOP-14 (Exposed Pad) only.
PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7235/36/39/40-00 March 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/


  Richtek Technology Electronic Components Datasheet  

RT7239 Datasheet

(RT7235 - RT7240) Synchronous Step-Down Converter

No Preview Available !

RT7235/36/39/40
Ordering Information
Continuous Switching Mode
RT7235
Package Type
CP : TSSOP-14 (Exposed Pad)
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
RT7239
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Marking Information
RT7235GCP
RT7235GCP
YMDNN
RT7235GCP : Product Number
YMDNN : Date Code
RT7235GQW
1N=YM
DNN
1N= : Product Code
YMDNN : Date Code
RT7239GSP
RT7239
GSPYMDNN
RT7239GSP : Product Number
YMDNN : Date Code
Discontinuous Operating Mode
RT7236
Package Type
CP : TSSOP-14 (Exposed Pad)
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
RT7240
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.
RT7236GCP
RT7236GCP
YMDNN
RT7236GCP : Product Number
YMDNN : Date Code
RT7236GQW
1M=YM
DNN
1M= : Product Code
YMDNN : Date Code
RT7240GSP
RT7240
GSPYMDNN
RT7240GSP : Product Number
YMDNN : Date Code
Pin Configurations
VS
FB
VREG5
SS
GND
PGOOD
EN
14
2 13
3 12
4 PGND 11
5 10
6 15 9
78
VCC
VIN
BOOT
SW
SW
PGND
PGND
TSSOP-14 (Exposed Pad)
(TOP VIEW)
EN 1
FB 2
VREG5 3
SS 4
PGOOD 5
10 VIN
9 VIN
8 BOOT
7 SW
11 SW
WDFN-10L 3x3
EN
FB
VREG5
SS
8
27
PGND
36
9
45
VIN
BOOT
SW
PGND
SOP-8 (Exposed Pad)
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7235/36/39/40-00 March 2013
Free Datasheet http://www.datasheet4u.com/


Part Number RT7239
Description (RT7235 - RT7240) Synchronous Step-Down Converter
Maker Richtek
Total Page 18 Pages
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