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TD2776B Datasheet Preview

TD2776B Datasheet

3A 22V Synchronous Rectified Step-Down Converter

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DATASHEET
3A 22V Synchronous Rectified Step-Down Converter TD2776B
General Description
Features
The TD2776B is a monolithic synchronous buck
regulator. The device integrates two 90m
MOSFETs, and provides 3A of continuous load current
over a wide input voltage of 4.75V to 22V. Current
mode control provides fast transient response
and cycle-by-cycle current limit.
An adjustable soft-start prevents inrush current at
turn-on, and in shutdown mode the supply current
drops to 1µA.
This device, availablein an SOP8-PP package,
provides a very compact solution with minimal external
components.
3A Output Current
Wide 4.75V to 22V Operating Input Range
Integrated 90mPower MOSFET Switches
Output Adjustable from 0.923V to 20V
Up to 93% Efficiency
Programmable Soft-Start
Stable with Low ESR Ceramic Output Capacitors
Fixed 600KHz Frequency
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Applications
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
Package Types
October, 20, 2010.
Figure 1. Package Types of TD2776
Techcode Semiconductor Limited
1
SOP8
www.techcodesemi.com




Techcode

TD2776B Datasheet Preview

TD2776B Datasheet

3A 22V Synchronous Rectified Step-Down Converter

No Preview Available !

Techcode®
DATASHEET
3A 22V Synchronous Rectified Step-Down Converter TD2776B
Pin Configurations
Pin Description
Figure 2 Pin Configuration of TD2776B(Top View)
Pin Number Pin Name Description
1 BS
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel
MOSFET switch. Connect a 0.01µF or greater capacitor from SW to BS to power the
high side switch.
2 IN
Power Input. IN supplies the power to the IC, as well as the step-down converter
switches. Drive IN with a 4.75V to 22V power source. Bypass IN to GND with a
suitably large capacitor to eliminate noise on the input to the IC. See Input Capacitor.
3 SW
Power Switching Output. SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load. Note that a capacitor is
required from SW to BS to power the high-side switch.
4 GND Ground.
5 FB
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB
with a resistive voltage divider from the output voltage. The feedback threshold
is 0.923V. See Setting the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation
6 COMP
control loop. In some cases, an additional capacitor from COMP to GND is
required. See Compensation Components.
7 EN
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to
turn on the regulator, drive it low to turn it off. Pull up with 100kresistor for
automatic startup.
8 SS
Soft-Start Control Input. SS controls the soft start period. Connect a capacitor from SS
to GND to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms.
To disable the soft-start feature, leave SS unconnected.
October, 20, 2010.
Techcode Semiconductor Limited
2
www.techcodesemi.com


Part Number TD2776B
Description 3A 22V Synchronous Rectified Step-Down Converter
Maker Techcode
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TD2776B Datasheet PDF






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