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TPS51125 Datasheet(PDF) 1 Page - Texas Instruments

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Part No. TPS51125
Description  Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA LDOs for Notebook System Power
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TPS51125 Datasheet(HTML) 1 Page - Texas Instruments

 
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1
FEATURES
DESCRIPTION
APPLICATIONS
9
10
11
12
VO1
PGOOD
VO2
VREG3
TPS51125RGE
(QFN24)
13
14
15
16
VBST1
DRVL1
LL1
DRVH1
VBST2
DRVH2
LL2
DRVL2
17
8
7
6
5
4
3
2
1
18
19
20
21
22
23
24
+
VO1
5V/6A
Q2
IRF7821
L1
3.3mH
Q1
IRF7821
-
VO1_GND
PGND
C6
10mF
C3
0.1mF
VIN
+
VO2
3.3V/6A
Q4
IRF7821
L2
3.3mH
Q3
IRF7821
-
VO2_GND
C4
0.1mF
VIN
PowerPAD
C21
10mF
CO1
POSCAP
330mF
PGND
R9
5.1W
+
VIN
5.5 ~ 28V
R8
5.1W
C8
10mF
C7
10mF
PGND
CO2
POSCAP
330mF
-
5V/100mA
PGND
R1
30kW
R4
20kW
R3
13kW
SGND
VREG5
VREG5
R7
100kW
PG
PGND
R2
20kW
C0
0.22mF
PGND
SGND
R5
110kW
SGND
R6
110kW
C14
1uF
C11
100n
F
C12
100n
F
C13
100n
F
PGND
PGND
PGND
-
15V/10mA
D0
D1
D2
D4
C10
100n
F
C20
10mF
PGND
-
3.3V/100mA
C5
10mF
VREF
VO1
-
EN0
PGND
PGND
R10
620kW
SGND
SGND
TPS51125
SLUS786A – OCTOBER 2007 – REVISED NOVEMBER 2007
www.ti.com
Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA
LDOs for Notebook System Power
2
• Wide Input Voltage Range: 5.5 V to 28 V
• Output Voltage Range: 2 V to 5.5 V
The TPS51125 is a cost effective, dual-synchronous
buck controller targeted for notebook system power
• Built-in 100-mA 5-V/3.3-V LDO with Switches
supply solutions. It provides 5-V and 3.3-V LDOs and
• Built-in 1% 2-V Reference Output
requires few external components. The 270-kHz
• With/Without Out-of-Audio™ Mode Selectable
VCLK output can be used to drive an external charge
Light Load and PWM only Operation
pump, generating gate drive voltage for the load
switches
without
reducing
the
main
converter’s
• Internal 1.6-ms Voltage Servo Softstart
efficiency. The TPS51125 supports high efficiency,
• Adaptive On-Time Control Architecture with
fast transient response and provides a combined
Four Selectable Frequency Setting
power-good signal. Out-of-Audio™ mode light-load
operation enables low acoustic noise at much higher
• 4500 ppm/°C R
DS(on) Current Sensing
efficiency than conventional forced PWM operation.
• Built-In Output Discharge
Adaptive
on-time
D-CAP™
control
provides
• Power Good Output
convenient and efficient operation. The part operates
• Built-in OVP/UVP/OCP
with supply input voltages ranging from 5.5 V to 28 V
and supports output voltages from 2 V to 5.5 V. The
• Thermal Shutdown (Non-latch)
TPS51125 is available in a 24-pin QFN package and
• QFN24 (RGE)
is specified from -40
°C to 85°C ambient temperature
range.
• Notebook Computers
• I/O Supplies
• System Power Supplies
Typical Application Diagram
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.
2
Out-of-Audio, D-CAP are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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