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  Richtek Technology Electronic Components Datasheet  

RT7266 Datasheet

Synchronous Step-Down Converter

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RT7266 pdf
®
RT7266
3A, 18V, 700kHz ACOTTM Synchronous Step-Down
Converter
General Description
The RT7266 is an adaptive on-time ACOTTM mode
synchronous buck converter. The adaptive on-time ACOTTM
mode control provides a very fast transient response with
few external components. The low impedance internal
MOSFET can support high efficiency operation with wide
input voltage range from 4.5V to 18V . The proprietary
circuit of the RT7266 enables to support all ceramic
capacitors. The output voltage can be adjustable between
0.8V and 8V. The soft-start is adjustable by an external
capacitor.
Ordering Information
RT7266
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Note :
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
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
z ACOTTM Mode Enables Fast Transient Response
z 4.5V to 18V Input Voltage Range
z 3A Output Current
z 60mΩ Internal Low Site N-MOSFET
z Adaptive On-Time Control
z Fast Transient Response
z Support All Ceramic Capacitors
z Up to 95% Efficiency
z 700kHz Switching Frequency
z Adjustable Output Voltage from 0.8V to 8V
z Adjustable Soft-Start
z Cycle-by-Cycle Current Limit
z Input Under Voltage Lockout
z Thermal Shutdown Protection
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
Marking Information
RT7266
ZSPYMDNN
RT7266ZSP : Product Number
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
EN
FB
PVCC
SS
8
27
GND
36
9
45
VIN
BOOT
SW
GND
SOP-8 (Exposed Pad)
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS7266-02 September 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
Free Datasheet http://www.datasheet4u.com/


  Richtek Technology Electronic Components Datasheet  

RT7266 Datasheet

Synchronous Step-Down Converter

No Preview Available !

RT7266 pdf
RT7266
Typical Application Circuit
VIN
Chip Enable
C1
10µF x 2
8
RT7266
VIN SW
6
C2
0.1µF
1 EN
BOOT 7
5, 9 (Exposed Pad)
GND
FB 2
4 SS
C5
3.9nF
PVCC 3
L1
1.4µH
C6
0.1µF
C3 R1
8.25k
VPVCC
C4
1µF
R2
22.1k
VOUT
1.05V/3A
C7
22µF x 2
VOUT (V)
1
1.05
1.2
1.8
2.5
3.3
5
7
Table 1. Suggested Component Values
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
Functional Pin Description
Pin No.
Pin Name
Pin Function
Enable Input. A logic-high enables the converter; a logic-low forces the RT7266
1 EN into shutdown mode reducing the supply current to less than 10μA. Attach this
pin to VIN with a 100kΩ pull up resistor for automatic start-up.
Feedback Input. It is used to regulate the output of the converter to a set value
2 FB via an external resistive voltage divider. The feedback reference voltage is
0.765V typically.
3
PVCC
Internal Regulator Output. Connect a 1μF capacitor to GND to stabilize
output voltage.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor
4 SS from SS to GND to set the soft-start period. A 3.9nF capacitor sets the soft-start
period to 1.5ms.
5, 9 (Exposed pad) GND
Ground. The Exposed pad should be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
6 SW Switch Node. Connect this pin to an external L-C filter.
7
BOOT
Bootstrap for High Side Gate Driver. Connect a 0.1μF or greater ceramic
capacitor from BOOT to SW pins.
8
VIN
Supply Input. The input voltage range is from 4.5V to 18V. Must bypass with a
suitable large ( 10μF x 2) ceramic capacitor.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS7266-02 September 2012
Free Datasheet http://www.datasheet4u.com/


Part Number RT7266
Description Synchronous Step-Down Converter
Maker Richtek
Total Page 13 Pages
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