TPS65279_15 Datasheet, PDF (1/38 Pages) Texas Instruments – TPS65279 4.5- to 18-V Input, 5-A/5-A Dual Synchronous Step-Down Converter With Current Sharing

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS65279
SLVSC85C – AUGUST 2013 – REVISED MAY 2015
TPS65279 4.5- to 18-V Input, 5-A/5-A Dual Synchronous Step-Down Converter With
Current Sharing
1 Features
•1 4.5-V to 18-V Wide Input Voltage Range
• Programmable Slew Rate Control for Output
Voltage Transition
• Up to 5-A Maximum Continuous Output Current in
Buck 1 and Buck 2
• Buck 1 and Buck 2 can be Paralleled to Deliver up
to 10-A Current
• Pulse Skipping Mode to Achieve High Efficiency in
Light Load
• Adjustable Switching Frequency
200 kHz to 1.6 MHz Set by External Resistor
• Dedicated Enable and Soft-Start for Each Buck
• Peak Current-Mode Control With Simple
Compensation Circuit
• Cycle-by-Cycle Overcurrent Protection
• 180° Out-of-Phase Operation to Reduce Input
Capacitance and Power Supply Induced Noise
• Over Temperature Protection
• Available in 32-Pin Thermally Enhanced HTSSOP
(DAP) and 36-Pin VQFN 6-mm × 6-mm (RHH)
Packages
2 Applications
• DTV
• Telecom and Network
• Point-of-Load
• Set Top Boxes
• Tablet PC
SPACE
Typical Application Schematic
R1
R2
C3
C9
VIN
DVCC ^C14
R16 _R15
EN1 ^{TPS65279 FB2}
EN2
RLIM2
PGND2
BST2
PVIN2
LX2
PVIN2
LX2
ISHARE
COMP2
V7V
VIN
PVIN1
PVIN1
PGND1
PGOOD1
PGOOD2
ROSC
COMP1
LX1
LX1
BST1
RLIM1
FB1
C30 L2
R26 ^C26
R24
R23 C23
L1
C19
R32
R31 ^C29
VOUT2
VOUT1
R18 _C20
R17
3 Description
TPS65279 is a monolithic dual synchronous buck
converter with wide 4.5-V to 18-V operating input
voltage range that encompassed most intermediate
bus voltage operating off 5-, 9-, 12- or 15-V power
bus or battery. The converter with constant frequency
peak current mode control is designed to simplify its
application while giving the designers options to
optimize their usage according to the target
applications.
Two bucks in TPS65279 can be paralleled to delivery
up to 10-A load current by using current sharing
mode, connect ISHARE pin high. Two phase
operation in current sharing reduces system filtering
capacitance and inductance, alleviates EMI and
improves output voltage ripple and noise.
TPS65279 features a dedicated enable pin. An
independent soft-start pin provides flexibility in power
up programmability. Constant frequency peak current
mode control simplifies the compensation and
provides fast transient response. Cycle-by-cycle
overcurrent protection and hiccup mode operation
limit MOSFET power dissipation in short circuit or
over loading fault conditions.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS65279
HTSSOP (32)
VQFN (36)
6.20 mm × 11.00 mm
6.00 mm × 6.00 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 Loading
Forced PWM
Auto PSM-PWM
1
2
3
4
5
Loading (A)
C009
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.