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TPS5124 Datasheet

  • TPS5124

  • TPS5124 双通道同步步降 PWM 控制器

  • 332.00KB

  • 17页

  • TI

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TPS5124
SLUS571 鈭?SEPTEMBER 2003
DUAL CHANNEL, SYNCHRONOUS
STEP DOWN PWM CONTROLLER
FEATURES
D
High Efficiency 鈭?No Current Sense Resistor
D
D
D
D
D
D
D
D
Required, R
DS(on)
Overcurrent Detection with
Temperature Compensation
Adjustable Output Voltage Down to 0.9 V
Voltage-Mode PWM Control: Maximum
500-kHz Operation
180掳 Out-of-Phase Control
Individual Standby and Soft-Start for Each
Channel 鈭?Easy Power Sequencing
Overvoltage and Undervoltage Protection
Built-In Boot-Strap Diode
Built-In 5-V Linear Regulator
Accurate
卤
1% 0.85-V Reference
DESCRIPTION
The TPS5124 is dual independent high efficiency
synchronous step-down controller. It supports a
low-voltage/high-current power supply applica鈭?/div>
tions that use either a 5-V or 12-V bus voltage.
Since both controllers of the TPS5124 operate
180 degree out-of-phase, the input current ripple
is minimized resulting in a smaller input
capacitance and reduced power supply cost.
The current protection circuit detects the
drain-to-source voltage drop across the high-side
and low-side power MOSFET while it is
conducting. Also, the current protection circuit has
a temperature coefficient to compensate for the
R
DS(on)
variation of the MOSFET. This
resistor-less current protection and built-in boost
diode simplify the system design and reduces the
external parts count. Other features such as
undervoltage lockout, overvoltage, undervoltage,
and programmable short-circuit protection
promote system reliability.
VIN
APPLICATIONS
D
Consumer Game Systems
D
DSP Applications
D
Digital Set-Top Box
D
VGA and Sound Cards
VO1
1
INV1
TPS5124
2 FB1
3 SS1
4 N/C
5
CT
6 N/C
7 GND
8 REF
VIN
9 STBY1
10 STBY2
11 SCP
12 N/C
13 SS2
14 FB2
VO2
15 INV2
LH1 30
29
OUT1_U
28
LL1
27
OUT1_D
26
OUTGND1
TRIP1 25
VCC 24
23
TRIP2
22
VREF5
21
VLSD
20
OUTGND2
19
OUT2_D
18
LL2
17
OUT2_D
16
LH2
VIN
VO1
VIN
VO2
UDG鈭?3123
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
铮?/div>
2003, Texas Instruments Incorporated
www.ti.com
1

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