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TPS65270PWPR
2 Buck Converter with 4.5V to 16V Input Voltage, 2A/3A Output Current
LX1GND
LX1
FB1 VIN1
EN1 BST1 23
R5a
40.2K
1.2V/3A
C14
22uF
4.7uH
10uF
25V
VIN
47nF
R4a
40.2K
R4b
32.4K
C11
82pF
1.8V/2A
C10
22uF
4.7uH
ENABLE Buck1
FB1
100IN
ficiency
300 kHzto 1.4 MHz Setby External Resistor Startup Witha Prebiased Output Voltage 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 Operationto Reduce Input
Capacitance and Power Supply Induced Noise Availablein 24-Lead Thermally Enhanced
HTSSOP (PWP) and VQFN 4-mm× 4-mm (RGE)
Packages
Applications DTV DSL Modems Cable Modems Set-Top Boxes Car DVD Players Home Gateway and Access Point Networks Wireless Routers
converter features an enable pin that allows
dedicated control of each channel that provides
flexibility for power sequencing. Soft-start time in
each channel can be adjusted by choosing different
external capacitors. TPS65270is also ableto startup
with a prebiased output. The converter begins
switching when output voltage reaches the prebiased
voltage.
Constant frequency peak current-mode control
simplifies the compensation and provides fast
transient response. Cycle-by-cycle overcurrent
protection and hiccup mode operation limits MOSFET
power dissipationin short-circuitor overloading fault
conditions. Low-side reverse current protection also
prevents excessive sinking current from damaging
the converter.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Application Efficiencyvs Output Load
