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| 型号： | TPS54478RTET |
| 厂商： | Texas Instruments |
| 文件页数： | 1/38页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 16WQFN |
| 标准包装： | 1 |
| 系列： | SWIFT™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 4.5 V |
| 输入电压： | 2.95 V ~ 6 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-WQFN 裸露焊盘（3x3） |
| 其它名称： | 296-29064-6 |
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SLVSAS2 – JUNE 2011
2.95-V to 6-V Input, 4-A Output, 2-MHz, Synchronous Step-Down
Switcher With Integrated FETs ( SWIFT ? )
Check for Samples: TPS54478
1
FEATURES
DESCRIPTION
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2
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Two 30-m ? (typical) MOSFETs for High
Efficiency at 4 A Loads
200kHz to 2MHz Switching Frequency
0.6 V ± 1% Voltage Reference Over
Temperature ( – 40 ° C to 150 ° C)
Start up with Pre-Biased Voltage
Synchronizes to External Clock
Adjustable Slow Start / Sequencing
UV and OV Power Good Output
Cycle by Cycle Current Limit and Hiccup
Current Protection
Thermally Enhanced 3mm × 3mm 16-pin QFN
(RTE)
Pin Compatible to TPS54418
The TPS54478 device is a full featured 6 V, 4 A,
synchronous step down current mode converter with
two integrated MOSFETs.
The TPS54478 enables small designs by integrating
the MOSFETs, implementing current mode control to
reduce external component count, reducing inductor
size by enabling up to 2 MHz switching frequency,
and minimizing the IC footprint with a small 3mm x
3mm thermally enhanced QFN package.
The TPS54478 provides accurate regulation for a
variety of loads with an accurate ± 1% Voltage
Reference (VREF) over temperature.
Efficiency is maximized through the integrated 30m ?
MOSFETs and 525 μ A typical supply current. Using
the enable pin, shutdown supply current is reduced to
APPLICATIONS
? Low-Voltage, High-Density Power Systems
? Point of Load Regulation for High Performance
DSPs, FPGAs, ASICs and Microprocessors
2.5 μ A by entering a shutdown mode.
Under voltage lockout is internally set at 2.6 V, but
can be increased by programming the threshold with
a resistor network on the enable pin. The output
voltage startup ramp is controlled by the slow start
?
Broadband, Networking and Optical
pin. An open drain power good signal indicates the
Communications Infrastructure
SIMPLIFIED SCHEMATIC
vertical spacer
vertical spacer
output is within 93% to 107% of its nominal voltage.
Cycle-by-cycle current limit, hiccup overcuurent
protection and thermal shutdown protect the device
during an overcurrent condition.
The TPS54478 is supported in the SwitcherPro ?
Software Tool at www.ti.com/switcherpro .
VIN
CI
R4
VIN
BOOT
TPS54478
C BOOT
LO
VOUT
For more SWIFT TM documentation, see the TI
website at www.ti.com/swift .
EN
PH
95
R5
PWRGD
CO
R1
90
VSENSE
85
V IN = 5 V
SS/TR
RT /CLK
COMP
GND
AGND
R2
80
75
70
V IN = 3.3 V
C ss
POWERPAD
RT
R3
65
C1
60
55
50
F S = 1 MHz,
DCR = 6.8 m W ,
V O = 1.8 V
0
0.5
1
1.5 2 2.5
3
3.5
4
I O - Output Current - A
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
SWIFT, SwitcherPro are trademarks of Texas Instruments.
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 ? 2011, Texas Instruments Incorporated
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| TPS54494PWP | 功能描述:直流/直流开关转换器 4A Dual Channel Sync SD Switcher RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS54494PWPR | 功能描述:直流/直流开关转换器 4A Dual Channel Sync SD Switcher RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS54494RSAR | 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 4A/2A 16QFN 制造商:Texas Instruments 功能描述:4A/2A Dual Channel Sync Converter |
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