TPS5124_15 Datasheet, PDF (1/18 Pages) Texas Instruments – DUAL CHANNEL, SYNCHRONOUS STEP-DOWN PWM CONTROLLER

TPS5124
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DUAL CHANNEL, SYNCHRONOUS
STEPĆDOWN PWM CONTROLLER
SLUS571 − SEPTEMBER 2003
FEATURES
D High Efficiency − No Current Sense Resistor
Required, R_DS(on) Overcurrent Detection with
Temperature Compensation
D Adjustable Output Voltage Down to 0.9 V
D Voltage-Mode PWM Control: Maximum
500-kHz Operation
D 180° Out-of-Phase Control
D Individual Standby and Soft-Start for Each
Channel − Easy Power Sequencing
D Overvoltage and Undervoltage Protection
D Built-In Boot-Strap Diode
D Built-In 5-V Linear Regulator
D Accurate ± 1% 0.85-V Reference
APPLICATIONS
D Consumer Game Systems
D DSP Applications
D Digital Set-Top Box
D VGA and Sound Cards
DESCRIPTION
The TPS5124 is dual independent high efficiency
synchronous step-down controller. It supports a
low-voltage/high-current power supply applica−
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
VO1
VIN
VO2
1 _INV1
2 _FB1
3 _SS1
4 _N/C
5 _CT
6 _N/C
7 _GND
8 _REF
9 _STBY1
10 _STBY2
11 _SCP
12 _N/C
13 _SS2
14 _FB2
15 _INV2
TPS5124
LH1 ³⁰
OUT1_U ²⁹
LL1 ²⁸
OUT1_D ²⁷
OUTGND1 ²⁶
TRIP1 ²⁵
VCC ²⁴
TRIP2 ²³
22
VREF5
21
VLSD
OUTGND2 ²⁰
OUT2_D ¹⁹
LL2 ¹⁸
OUT2_U ¹⁷
LH2 ¹⁶
VIN
VO1
VIN
VO2
UDG−03123
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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.
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Copyright  2003, Texas Instruments Incorporated
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