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TPS542951 Datasheet Preview

TPS542951 Datasheet

2A/3A Dual Channel Synchronous Step-Down Switcher

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TPS542951
www.ti.com
SLVSBI4B – JULY 2012 – REVISED OCTOBER 2013
2A/3A Dual Channel Synchronous Step-Down Switcher with Integrated FET
Check for Samples: TPS542951
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 m(High Side) and 100 m(Low Side)
• High Initial Reference Accuracy
• Supports Constant 2 A CH1 and 3 A CH2 Load
Current
• Low-Side rDS(on) Loss-Less Current Sensing
• Adjustable Soft Start
• Non-Sinking Pre-Biased Soft Start
• 700 kHz Switching Frequency
• Cycle-by-Cycle Over-Current Limit Control
• OCL/UVLO/TSD Protections
• Hiccup Timer for Overload Protection
• 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 TPS542951 is a dual, adaptive on-time D-
CAP2™ mode synchronous buck converter. The
TPS542951 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 TPS542951 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 TPS542951 to maintain high efficiency
during lighter load conditions. The TPS542951 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 TPS542951 is available in a 4.4mm × 5.0mm 16
pin TSSOP (PWP) package, and 4mm x 4mm 16 pin
VQFN (RSA) package, and is specified for an
ambient temperature range from –40°C to 85°C.
Input Voltage
VO1
C11
L11
C21
PGND
R11
R21
SGND
SGND
1 VIN1
VIN2 16
2 VBST1
C31
3 SW1
VBST2 15
C32
SW2 14
4 PGND1
5 EN1
TPS542951
HTSSOP16
PGND2 13
EN2 12
C12
L12
VO2
C22
PGND
6 SS1
7 VFB1
8 GND
(PowerPAD)
SS2 11
VFB2 10
C4
VREG5 9
SGND
PGND
R12
R22
SGND
VO2 = 1.5 V (50
Iout (2 A/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, PowerPAD 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




etcTI

TPS542951 Datasheet Preview

TPS542951 Datasheet

2A/3A Dual Channel Synchronous Step-Down Switcher

No Preview Available !

TPS542951
SLVSBI4B – JULY 2012 – REVISED OCTOBER 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
–40to 85
ORDERING INFORMATION(1)
PACKAGE(2) (3)
ORDERING PART NUMBER
PWP
TPS542951PWPR
TPS542951PWP
RSA
TPS542951RSAR
TPS542951RSAT
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
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(3) All packaging options have Cu NIPDAU lead/ball finish.
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, SS1, SS2
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 conditions for extended periods may affect device reliability.
(2) All voltages are with respect to IC GND terminal.
THERMAL INFORMATION
THERMAL METRIC(1)
TPS542951
PWP (16) PINS RSA (16) PINS
UNITS
θJA
θJCtop
θJB
ψJT
ψJB
θJCbot
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
47.5
34.9
27.1
40.0
20.8
11.8
°C/W
1.0
0.7
20.6
11.8
2.7
.3.3
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
2
Submit Documentation Feedback
Product Folder Links: TPS542951
Copyright © 2012–2013, Texas Instruments Incorporated


Part Number TPS542951
Description 2A/3A Dual Channel Synchronous Step-Down Switcher
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