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參數(shù)資料
| 型號： | TPS5401DGQT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 3/41頁 |
| 文件大小： | 1149K |
| 代理商： | TPS5401DGQT |
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www.ti.com
SLVSAB0 – DECEMBER 2010
OVERVIEW
The TPS5401 device is a 42-V, 0.5-A, step-down (buck) regulator with an integrated high-side n-channel
MOSFET. To improve performance during line and load transients, the device implements a constant-frequency,
current-mode control which reduces output capacitance and simplifies external frequency compensation design.
The wide switching-frequency range of 100 kHz to 2500 kHz allows for efficiency and size optimization when
selecting the output filter components. The switching frequency is adjusted using a resistor to ground on the
RT/CLK pin. The device has an internal phase-lock loop (PLL) on the RT/CLK pin that is used to synchronize the
power-switch turnon to a falling edge of an external system clock.
The TPS5401 has a default start-up voltage of approximately 2.5 V. The EN pin has an internal pullup current
source that can be used to adjust the input voltage undervoltage lockout (UVLO) threshold with two external
resistors. In addition, the pullup current provides a default condition. When the EN pin is floating, the device
operates. The operating current is 116 mA when not switching and under no load. When the device is disabled,
the supply current is 1.3 mA.
The integrated 200-m
high-side MOSFET allows for high-efficiency power-supply designs capable of delivering
0.5 amperes of continuous current to a load. The TPS5401 reduces the external component count by integrating
the boot recharge diode. The bias voltage for the integrated high-side MOSFET is supplied by a capacitor from
the BOOT pin to the PH pin. The boot capacitor voltage is monitored by a UVLO circuit and turns the high-side
MOSFET off when the boot voltage falls below a preset threshold. The TPS5401 can operate at high duty cycles
because of the boot UVLO. The output voltage can be stepped down to as low as the 0.8-V reference.
The TPS5401 has a power-good comparator (PWRGD) which asserts when the regulated output voltage is less
than 92% or greater than 109% of the nominal output voltage. The PWRGD pin is an open-drain output which
deasserts when the VSENSE pin voltage is between 94% and 107% of the nominal output voltage, allowing the
pin to transition high when a pullup resistor is used.
The TPS5401 minimizes excessive output overvoltage (OV) transients by taking advantage of the OV
power-good comparator. When the OV comparator is activated, the high-side MOSFET is turned off and masked
from turning on until the output voltage is lower than 107%.
The SS/TR (slow-start/tracking) pin is used to minimize inrush currents or provide power-supply sequencing
during power up. A small-value capacitor should be coupled to the pin to adjust the slow-start time. A resistor
divider can be coupled to the pin for critical power-supply sequencing requirements. The SS/TR pin is discharged
before the output powers up. This discharging ensures a repeatable restart after an overtemperature fault, UVLO
fault, or a disabled condition.
The TPS5401 also discharges the slow-start capacitor during overload conditions with an overload recovery
circuit. The overload recovery circuit slow-starts the output from the fault voltage to the nominal regulation
voltage once a fault condition is removed. A frequency-foldback circuit reduces the switching frequency during
start-up and overcurrent fault conditions to help control the inductor current.
Copyright 2010, Texas Instruments Incorporated
11
Product Folder Link(s): TPS5401
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| TPS5401EVM-708 | 功能描述:電源管理IC開發(fā)工具 Eval Mod for TPS5401 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS5402 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.5-V TO 28-V INPUT VOLTAGE, 1.7-A OUTPUT CURRENT, NON-SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET |
| TPS54020 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V to 17V Input, 10A Synchronous Step-Down SWIFTa?￠ Converter With Full Feature Set |
| TPS54020_13 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Small, 10-A, 4.5-V to 17-V Input, SWIFT Synchronous Step-Down Converter with Light-Load Efficiency |
| TPS54020EVM-082 | 功能描述:電源管理IC開發(fā)工具 TPS54020 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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