STEP-DOWN CONVERTER. TPS54326 Datasheet

TPS54326 CONVERTER. Datasheet pdf. Equivalent

TPS54326 Datasheet
Recommendation TPS54326 Datasheet
Part TPS54326
Description 3-A SYNCHRONOUS STEP-DOWN CONVERTER
Feature TPS54326; www.ti.com TPS54326 SLVSA13E – OCTOBER 2009 – REVISED JUNE 2012 4.5V to 18V Input, 3-A Synchronous.
Manufacture etcTI
Datasheet
Download TPS54326 Datasheet




Texas Instruments TPS54326
www.ti.com
TPS54326
SLVSA13E – OCTOBER 2009 – REVISED JUNE 2012
4.5V to 18V Input, 3-A Synchronous Step-Down Converter with Eco-mode™
Check for Samples: TPS54326
FEATURES
1
23 D-CAP2™ Mode Enables Fast Transient
Response
• Low Output Ripple and Allows Ceramic Output
Capacitor
• Wide VCC Input Voltage Range: 4.5 V to 18 V
• Wide VIN Input Voltage Range: 2 V to 18 V
• Output Voltage Range: 0.76 V to 5.5 V
• Highly Efficient Integrated FET’s Optimized
for Lower Duty Cycle Applications
- 120 m(High Side) and 70 m(Low Side)
• High Efficiency, less than 10 μA at Shutdown
• Auto-Skip Eco-mode™ for High Efficiency at
Light Load
• High Initial Bandgap Reference Accuracy
• Adjustable Soft Start
• Pre-Biased Soft Start
• 700-kHz Switching Frequency (fSW)
• Cycle-By-Cycle Overcurrent Limit
• Power Good Output
APPLICATIONS
• Wide Range of Applications for Low Voltage
System
– Digital TV Power Supply
– High Definition Blu-ray Disc™ Players
– Networking Home Terminal
– Digital Set Top Box (STB)
DESCRIPTION
The TPS54326 is an adaptive on-time D-CAP2™
mode synchronous buck converter. The TPS54326
enables system designers to complete the suite of
various end equipment’s power bus regulators with a
cost effective, low component count, low standby
current solution. The main control loop for the
TPS54326 uses the D-CAP2™ mode control which
provides a fast transient response with no external
components. The adoptive on-time control supports
seamless operation between PWM mode at heavy
load condition and reduced frequency Eco-mode™
operation at light load for high efficiency.
The TPS54326 also has a proprietary circuit that
enables the device 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 operates from 4.5-V to 18-V
VCC input , and from 2-V to 18-V VIN input power
supply voltage. The output voltage can be
programmed between 0.76 V and 5.5 V. The device
also features an adjustable slow start time and a
power good function. The TPS54326 is available in
the 14 pin HTSSOP or 16 pin QFN package, and
designed to operate from –40°C to 85°C.
VOUT (50 mV/div)
IOUT (1 A/div)
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, PowerPAD are trademarks of Texas Instruments.
2
Blu-ray Disc is a trademark of Blu-ray Disc Association.
3
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 © 2009–2012, Texas Instruments Incorporated



Texas Instruments TPS54326
TPS54326
SLVSA13E – OCTOBER 2009 – REVISED JUNE 2012
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
TA
–40°C to 85°C
ORDERING INFORMATION(1)
PACKAGE(2) (3)
ORDERABLE PART NUMBER
PowerPAD™
(HTSSOP) – PWP
Plastic Quad Flat Pack (QFN)
TPS54326PWP
TPS54326PWPR
TPS54326RGTT
TPS54326RGTR
PIN
14
16
TRANSPORT
MEDIA
Tube
Tape and Reel
Tape and Reel
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 package options have Cu NIPDAU lead/ball finish.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted) (1)
VI Input voltage range
VO Output voltage range
Vdiff Voltage from GND to POWERPAD
ESD rating Electrostatic discharge
TJ Operating junction temperature
Tstg Storage temperature
VIN, VCC, EN
VBST
VBST (vs SW1, SW2)
VFB, VO, SS, PG
SW1, SW2
SW1, SW2 (10 ns transient)
VREG5
PGND1, PGND2
Human Body Model (HBM)
Charged Device Model (CDM)
VALUE
–0.3 to 20
–0.3 to 26
–0.3 to 6.5
–0.3 to 6.5
–2 to 20
–3 to 20
–0.3 to 6.5
–0.3 to 0.3
–0.2 to 0.2
2
500
–40 to 150
–55 to 150
UNIT
V
V
V
V
V
V
V
V
V
kV
V
°C
°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 is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
THERMAL INFORMATION
THERMAL METRIC(1)
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
TPS54326
PWP
14 PINS
55.6
51.3
26.4
1.8
20.6
4.3
TPS54326
RGT
16 PINS
46.1
58.1
18.8
1.3
18.8
4.8
UNITS
°C/W
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
2 Copyright © 2009–2012, Texas Instruments Incorporated
Product Folder Link(s) :TPS54326



Texas Instruments TPS54326
www.ti.com
TPS54326
SLVSA13E – OCTOBER 2009 – REVISED JUNE 2012
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
VCC Supply input voltage range
VIN Power input voltage range
VI Input voltage range
VO Output voltage range
IO Output current range
TA Operating free-air temperature
TJ Operating junction temperature
VBST
VBST (vs SW1, SW2)
SS, PG
EN
VO, VFB
SW1, SW2
SW1, SW2 (10 ns transient)
PGND1, PGND2
VREG5
IVREG5
MIN MAX UNIT
4.5 18 V
2 18 V
–0.1 24
–0.1 5.7
–0.1 5.7
–0.1 18
V
–0.1 5.5
–1.8 18
–3 18
–0.1 0.1
–0.1 5.7 V
0 10 mA
–40 85 °C
–40 125 °C
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range, VCC, VIN = 12V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
SUPPLY CURRENT
IVCC
Operating - non-switching supply
current
IVCCSDN Shutdown supply current
LOGIC THRESHOLD
VCC current, TA = 25°C, EN = 5 V,
VFB = 0.8 V
VCC current, TA = 25°C, EN = 0 V
VENH
EN high-level input voltage
EN
VENL
EN low-level input voltage
EN
VFB VOLTAGE AND DISCHARGE RESISTANCE
VFB Voltage light load mode
TA = 25°C, VO = 1.05 V, IO = 10 mA
TA = 25°C, VO = 1.05 V
VFB Threshold voltage, continuous mode TA = 0°C to 85°C, VO = 1.05 V(1)
TA = -40°C to 85°C, VO = 1.05 V(1)
IVFB Input current
VFB = 0.8 V, TA = 25°C
RDischg
VO discharge resistance
EN = 0 V, VO = 0.5 V, TA = 25°C
VREG5 OUTPUT
VVREG5
Output voltage
TA = 25°C, 6 V < VCC < 18 V,
0 < IVREG5 < 5 mA
VLN5
Line regulation
6 V < VCC < 18 V, IVREG5 = 5 mA
VLD5
Load regulation
0 mA < IVREG5 < 5 mA
IVREG5
Output current
VCC = 6 V, VREG5 = 4 V, TA = 25°C
MOSFET
RDS(on)h High side switch resistance
RDS(on)l
Low side switch resistance
CURRENT LIMIT
Iocl Current limit
THERMAL SHUTDOWN
TSDN
Thermal shutdown threshold
25°C, VBST - SW1, SW2 = 5.5 V
25°C
LOUT = 1.5µH (1)
Shutdown temperature (1)
Hysteresis (1)
(1) Specified by Design (not production tested).
Copyright © 2009–2012, Texas Instruments Incorporated
Product Folder Link(s) :TPS54326
MIN TYP MAX UNIT
850 1300
1.8 10
μA
μA
1.5 V
0.4 V
771
757 765 773
753 777
751 779
0 ±0.1
50 100
mV
mV
μA
5.3 5.5 5.7
V
20
100
70
mV
mV
mA
120 m
70 m
3.5 4.1 5.5
A
150
°C
25
3





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