Step-Down Controller. TPS51123 Datasheet

TPS51123 Controller. Datasheet pdf. Equivalent

Part TPS51123
Description Step-Down Controller
Feature TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 Dual-Synchronous, Step-Down C.
Manufacture etcTI
Datasheet
Download TPS51123 Datasheet



TPS51123
TPS51123
www.ti.com
SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013
Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA
LDOs for Notebook System Power
Check for Samples: TPS51123
FEATURES
1
2 Wide-Input Voltage Range: 5.5 V to 28 V
• Output Voltage Range: 2 V to 5.5 V
• Built-in 100-mA 5-V/3.3-V LDO with Switches
• Built-in 1% 2-V Reference Output
• With/Without Out-of-Audio™ Mode Selectable
Light-Load and PWM only Operation
• Internal 1.6-ms Voltage Servo Softstart
• Adaptive On-Time Control Architecture with
Four Selectable Frequency Setting
• 4500 ppm/°C RDS(on) Current Sensing
• Built-In Output Discharge
• Power Good Output
• Built-in OVP/UVP/OCP
• Thermal Shutdown (Non-latch)
• 24-Pin QFN (RGE) Package
APPLICATIONS
• Notebook Computers
• I/O Supplies
• System Power Supplies
DESCRIPTION
The TPS51123 is a cost effective, dual-synchronous
buck controller targeted for notebook system power
supply solutions. It provides 5-V and 3.3-V LDOs and
requires few external components. The TPS51123
supports high efficiency, fast transient responses and
provides a combined power-good signal. Out-of-
Audio™ mode light-load operation enables low
acoustic noise at much higher efficiency than
conventional forced PWM operation. Adaptive on-
time D-CAP™ control provides convenient and
efficient operation. The part operates with supply
input voltages ranging from 5.5 V to 28 V and
supports output voltages from 2 V to 5.5 V. The
TPS51123 is available in a 24-pin QFN package and
is specified from -40°C to 85°C ambient temperature
range.
VIN
10 mF x 2
VO2
3.3 V
3.3 mF
330 mF
13 kW
20 kW
130 kW
20 kW
220 nF
30 kW
130 kW
654321
VIN
10 mF x 2
10 mF
0.1 mF
7 VO2
8 VREG3
9 VBST2
5.1 W
10 DRVH2
TPS51123RGE
(QFN-24)
VO1 24
100 kW
PGOOD 23
VREG5
VBST1 22
5.1 W
DRVH1 21
0.1 mF
11 LL2 PowerPAD
LL1 20
12 DRVL2
DRVL1 19
3.3 mF
330 mF
VIN
5.5 V
to
28 V
VO1
5V
EN0
13 14 15 16 17 18
VREG5
33 mF
VIN
ENC
UDG-08167
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.
Out-of-Audio, D-CAP 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 © 2008–2013, Texas Instruments Incorporated



TPS51123
TPS51123
SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013
www.ti.com
TA
-40°C to 85°C
PACKAGE
Plastic Quad Flat Pack
(QFN)
ORDERING INFORMATION(1)
ORDERABLE
DEVICES
PINS
TRANSPORT
MEDIA
TPS51123RGET
24
Tape/Reel
TPS51123RGER
MINIMUM
QUANTITY
250
3000
ECO PLAN
Green (RoHS and no
Sb/Br)
(1) For the most current spcifications and package information, see the Package Option Addendum located at the end of this data sheet or
refer to our web site at http://www.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted)
PARAMETER
VBST1, VBST2
VIN
Input voltage range (1)
LL1, LL2
LL1, LL2, pulse width < 20 ns
VBST1, VBST2 (2)
EN0, ENC, TRIP1, TRIP2, VFB1, VFB2, VO1, VO2, TONSEL, SKIPSEL
Output voltage range (1)
DRVH1, DRVH2
DRVH1, DRVH2 (2)
PGOOD, VREG3, VREG5, VREF, DRVL1, DRVL2
Electrostatic discharge
Human body model QSS 009-105 (JESD22-A114A
Charged device model QSS 009-147 (JESD22-C101B.01)
Junction temperature range, TJ
Storage temperature, Tstg
VALUE
MIN MAX
–0.3
36
–0.3
30
–2.0
30
–5.0
30
–0.3
6
–0.3
6
–1.0
36
–0.3
6
–0.3
6
2
1.5
–40
125
–55
150
UNIT
V
V
kV
°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.
(2) Voltage values are with respect to the corresponding LLx terminal.
DISSIPATION RATINGS
2-oz. trace and copper pad with solder.
PACKAGE
24-pin RGE(1)
TA < 25°C POWER RATING
1.85 W
DERATING FACTOR ABOVE TA
= 25°C
18.5 mW/°C
(1) Enhanced thermal conductance by 3 x 3 thermal vias beneath thermal pad.
TA = 85°C POWER RATING
0.74 W
2
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Copyright © 2008–2013, Texas Instruments Incorporated





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