TPS65266-1 Datasheet, PDF (1/36 Pages) Texas Instruments – 2.7 to 6-V Input Voltage, 3-A/2-A/2-A Output Current Triple Synchronous Step-Down Converter

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TPS65266-1
SLVSDA6 – OCTOBER 2016
TPS65266-1 2.7 to 6-V Input Voltage, 3-A/2-A/2-A Output Current Triple Synchronous
Step-Down Converter
1 Features
•1 Operating Input Voltage Range 2.7 to 6 V
• Feedback Reference Voltage 0.6 V ±1%
• Maximum Continuous Output Current 3 A/2 A/2 A
• Dedicated Enable and Soft Start
• Accurate Start-Up Timing Control With Enable
Pins Discharge
• Pulse Skipping Mode (PSM) at Light Load
• Cycle-by-Cycle Current Limiting With Hiccup
Mode Overcurrent Protection
• Adjustable Clock Frequency 250 kHz to 2.4 MHz
• External Clock Synchronization
• Power-Good Indicator
• Overtemperature Protection
2 Applications
• Printer and Scanner
• Digital TV
• Set Top Box
• Home Gateway and Access Point Networks
• Surveillance
3 Description
The TPS65266-1 incorporates 3 channels of high-
efficiency synchronous buck converter for
applications operating off the adaptor or battery with
input voltage lower than 6 V.
SPACE
Simplified Application Schematic
Vin
VINx
LX1
Vout1
TPS65266-1
FB1
VINQ
LX2
Vout2
PGOOD
ENx
FB2
SSx
ROSC
LX3
Vout3
AGND
FB3
PGND
Copyright © 2016, Texas Instruments Incorporated
The buck DC/DC converter integrates power
MOSFETs for optimized power efficiency and
reduces external component counts. The peak
current mode control simplifies the compensation and
fast transient response. High clock frequency allows
smaller and low-value inductors and capacitors.
External compensation supports optimized loop
compensation and fast transient response. In light
load condition, the buck converter operates in PSM
mode for a reduction on the input power supplied to
the system. Cycle-by-cycle overcurrent limiting with
hiccup mode limits MOSFET power dissipation in
short circuit or overloading fault conditions.
The TPS65266-1 features a power-good supervisor
circuit that monitors all converter outputs. The
PGOOD pin is asserted after the output voltages in
each channel are in regulation and sequencing is
done.
When continuous heavy overload or short circuit
increases power dissipation in the buck converter,
internal thermal protection circuit shuts off the device
to prevent damage. Recovery from a thermal
shutdown is automatic after the device has cooled
sufficiently.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65266-1
VQFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0
0
Efficiency vs Output Load
V_OUT = 1.5 V
V_OUT = 2.5 V
0.5
1
1.5
2
2.5
3
Output Load (A)
D001
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.