Document
TPS54294
www.ti.com
SLVSB00D – OCTOBER 2011 – REVISED SEPTEMBER 2013
2A Dual Channel Synchronous Step-Down Switcher with Integrated FET
Check for Samples: TPS54294
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 : 0.76V to 7.0V • Highly Efficient Integrated FETs Optimized for
Low Duty Cycle Applications – 150 mΩ (High Side) and 100 mΩ (Low Side) • High Initial Reference Accuracy • Low-Side rDS(on) Loss-Less Current Sensing • Fixed Soft Start : 1.0ms • Non-Sinking Pre-Biased Soft Start • Powergood • 700 kHz Switching Frequency • Cycle-by-Cycle Over-Current Limit Control • OCL/OVP/UVP/UVLO/TSD Protections • Adaptive Gate Drivers with Integrated Boost PMOS Switch • OCP Constant Due To Thermally Compensated rDS(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 TPS54294 is a dual, adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54294 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 TPS54294 use the D-CAP2™ mode control which provides a very fast transient response with no external compensation components. The adaptive ontime control supports seamless transition between PWM mode at higher load conditions and Ecomode™ operation at light loads. Eco-mode™ allows the TPS54294 to maintain high efficiency during lighter load conditions. The TPS54294 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 TPS54294 is available in a 4.4mm × 5.0mm 16pin TSSOP (PWP) package, and 4mm x 4mm 16-pin VQFN (RSA) package specified for an ambient temperature range from –40°C to 85°C.
Input Voltage
VO1
C11 L11
C21
PGND
R11 R21
SGND
1 VIN1
VIN2 16
2 VBST1 C31
3 SW1
VBST2 15 C32
SW2 14
4 PGND1 5 EN1
TPS54294 HTSSOP16
PGND2 13 EN2 12
C12 L12
VO2
C22
PGND
6 PG1 7 VFB1 8 GND
(PowerPAD)
PG2 11
VFB2 10 C4
VREG5 9 PGND
R12 R22 SGND
VO2 = 1.5 V (50 mV/div)
Iout (1 A/div) t - Time - 100 ms/div
1
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, SWIFT 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 © 2011–2013, Texas Instruments Incorporated
TPS54294
SLVSB00D – OCTOBER 2011 – REVISED SEPTEMBER 2013
www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
TA –40℃ to 85℃
PACKAGE PWP RSA
ORDERING INFORMATION(1)
ORDERING PART NUMBER TPS54294PWPR TPS54294PWP TPS54294RSAR TPS54294RSAT
PINS 16 16
OUTPUT SUPPLY Tape-and-Reel Tube
Tape-and-Reel
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1) (2)
VALUE
UNIT
VIN1, VIN2, EN1, EN2
–0.3 to 20
VBST1, VBST2
–0.3 to 26
VBST1, VBST2 (10ns transient)
–0.3 to 28
Input voltage range
VBST1–SW1 , VBST2–SW2
–0.3 to 6.5
V
VFB1, VFB2
–0.3 to 6.5
SW1, SW2
–2 to 20
SW1, SW2 (10ns transient)
–3 to 22
Output voltage range
VREG5, PG1, PG2 PGND1, PGND2
–0.3 to 6.5 V
–0.3 to 0.3
Electrostatic discharge
Human Body Model (HBM) Charged Device Model (CDM)
2
kV
500
V
TA TSTG TJ
Operating ambient temperature range Storage temperature range Junction temperature range
–40 to 85
°C
–55 to 150
°C
–40 to 150
°C
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" are not implied. Exposure to absolute-maximum-rated condit.