TPS54394_16 Datasheet, PDF (1/28 Pages) Texas Instruments – 3A Dual Channel Synchronous Step-Down Switcher with Integrated FET

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TPS54394
SLVSBE6B – JUNE 2012 – REVISED AUGUST 2013
3A Dual Channel Synchronous Step-Down Switcher with Integrated FET
Check for Samples: TPS54394
FEATURES
1
•2 D-CAP2™ Control Mode
– Fast Transient Response
– No External Parts Required For Loop
Compensation
– Compatible with Ceramic Output
Capacitors
• Wide Input Voltage Range : 4.5 V to 18 V
• Output Voltage Range : 0.76 V to 7 V
• Highly Efficient Integrated FETs Optimized for
Low Duty Cycle Applications
– 90 mΩ (High Side) and 60 mΩ (Low Side)
• High Initial Reference Accuracy
• Supports Constant 3 A at Both Channels
• Low-Side r_DS(on) Loss-Less Current Sensing
• Fixed Soft Start : 1 ms
• Non-Sinking Pre-Biased Soft Start
• Powergood
• 700 kHz Switching Frequency
• Cycle-by-Cycle Over-Current Limit Control
• Hiccup Timer for Overload Protection
• OCL/UVLO/TSD Protections
• Adaptive Gate Drivers with Integrated Boost
PMOS Switch
• OCP Constant Due To Thermally Compensated
r_DS(on) with 4000ppm/℃
• 16-Pin HTSSOP, 16-Pin VQFN
• Auto-Skip Eco-mode™　for High Efficiency at
Light Load
APPLICATIONS
• Point-of-Load Regulation in Low Power
Systems for Wide Range of Applications
– Digital TV Power Supply
– Networking Home Terminal
– Digital Set Top Box (STB)
– DVD Player/Recorder
– Gaming Consoles and Other
DESCRIPTION
The TPS54394 is a dual, adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54394
enables system designers to complete the suite of
various end equipment’s power bus regulators with a
cost effective, low component count, and low standby
current solution. The main control loops of the
TPS54394 use the D-CAP2™ mode control which
provides a very fast transient response with no
external compensation components. The adaptive on-
time control supports seamless transition between
PWM mode at higher load conditions and Eco-
mode™ operation at light loads. Eco-mode™ allows
the TPS54394 to maintain high efficiency during
lighter load conditions. The TPS54394 is able to
adapt to both low equivalent series resistance (ESR)
output capacitors such as POSCAP or SP-CAP, and
ultra-low ESR, ceramic capacitors. The device
provides convenient and efficient operation with input
voltages from 4.5V to 18V.
The TPS54394 is available in a 4.4 mm × 5 mm 16-
pin TSSOP (PWP) and 4 mm x 4 mm 16-pin VQFN
(RSA) package, and is specified for an ambient
temperature range from –40°C to 85°C.
Input Voltage
1 VIN1
VIN2 16
VO1
C11
L11
C21
PGND
2 VBST1
C31
3 SW1
VBST2 15
C32
SW2 ¹⁴
4 PGND1
5 EN1
TPS54394
HTSSOP16
PGND2 ¹³
EN2 12
C12
L12
VO2
C22
PGND
R11
R21
6 PG1
7 VFB1
8 GND
(PowerPAD)
PG2 11
VFB2 10
C4
VREG5 ⁹
R12
R22
SGND
PGND
SGND
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
D-CAP2, Eco-mode, Eco-Mode are trademarks of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012–2013, Texas Instruments Incorporated