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TPS5120EVM-151 Datasheet

  • TPS5120EVM-151

  • DUAL OUTPUT, TWO PHASE SYNCHRONOUS BUCK DC/DC CONTROLLER

  • 20頁(yè)

  • TI

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TPS5120
DUAL OUTPUT, TWO PHASE SYNCHRONOUS BUCK DC/DC CONTROLLER
SLVS278E 鈥?AUGUST 2000 鈥?REVISED MARCH 2003
D
Independent Dual-Outputs Operate 180擄
D
D
D
D
D
D
D
D
D
D
D
D
Out of Phase
Wide Input Voltage Range: 4.5-V
鈥?/div>
28-V
Adjustable Output Voltage Down to 0.9 V
Pin-Selectable PWM/SKIP Mode for High
Efficiency Under Light Loads
Synchronous Buck Operation Allows up to
95% Efficiency
Separate Standby Control and Overcurrent
Protection for Each Channel
Programmable Short-Circuit Protection
Low Supply (1 mA) and Shutdown (1 nA)
Current
Power Good Output
High-Speed Error Amplifiers
Sequencing Easily Achieved by Selecting
Softstart Capacitor Values.
5-V Linear Regulator Power Internal IC
Circuitry
30-Pin TSSOP Packaging
INV1
FB1
SOFTSTART1
PWM/SKIP
CT
5V_STBY
GND
REF
STBY1
STBY2
FLT
POWERGOOD
SOFTSTART2
FB2
INV2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DBT PACKAGE
(TOP VIEW)
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
LH1
OUT1_u
LL1
OUT1_d
OUTGND1
TRIP1
V
CC
TRIP2
VREF5
REG5V_IN
OUTGND2
OUT2_d
LL2
OUT2_u
LH2
description
The TPS5120 is a dual channel, high-efficiency synchronous buck controller where the outputs run 180 degrees
out of phase, which lowers the input current ripple, thereby reducing the input capacitance cost. The PWM/SKIP
pin allows the operating mode to switch from PWM mode to skip mode under light load conditions. The skip
mode enables a lower operating frequency and shortens the pulse width to the low-side MOSFET, increasing
the efficiency under light load conditions. These two modes, along with synchronous-rectifier drivers, dead time,
and very low quiescent current, allow power to be conserved and the battery life to be extended under all load
conditions. The 1.5 A (typical) high-side and low-side MOSFET drivers on-chip are designed to drive less
expensive N-channel MOSFETs. The resistorless current protection and fixed high-side driver voltage simplify
the power supply design and reduce the external parts count. Each channel is independent, offering a separate
controller, overcurrent protection, and standby control. Sequencing is flexible and can be tailored by choosing
different softstart capacitor values. Other features, such as undervoltage lockout, power good, overvoltage,
undervoltage, and programmable short-circuit protection promote system reliability.
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
錚?/div>
2002, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1

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