- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄68202 > TC1304-CD3EUNTR 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 PDF資料下載
參數(shù)資料
| 型號(hào)： | TC1304-CD3EUNTR |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MO-187, MSOP-10 |
| 文件頁(yè)數(shù)： | 14/38頁(yè) |
| 文件大小： | 756K |
| 代理商： | TC1304-CD3EUNTR |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)當(dāng)前第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)
2008 Microchip Technology Inc.
DS21949C-page 21
TC1303A/TC1303B/TC1303C/TC1304
4.0
DETAILED DESCRIPTION
4.1
Device Overview
The
TC1303/TC1304
combines
a
500 mA
synchronous buck regulator with a 300 mA LDO and a
power-good output. This unique combination provides
a small, low-cost solution for applications that require
two or more voltage rails. The buck regulator can
deliver high-output current over a wide range of input-
to-output voltage ratios while maintaining high
efficiency. This is typically used for the lower-voltage,
high-current processor core. The LDO is a minimal
parts-count solution (single-output capacitor), providing
a regulated voltage for an auxiliary rail. The typical LDO
dropout voltage (137 mV @ 200 mA) allows the use of
very low input-to-output LDO differential voltages,
minimizing the power loss internal to the LDO pass
transistor. A power-good output is provided, indicating
that the buck regulator output, the LDO output or both
outputs are in regulation. Additional features include
independent shutdown inputs (TC1303), UVLO, output
voltage
sequencing
(TC1304),
overcurrent and
overtemperature shutdown.
4.2
Synchronous Buck Regulator
The synchronous buck regulator is capable of
supplying a 500 mA continuous output current over a
wide range of input and output voltages. The output
voltage range is from 0.8V (minimum) to 4.5V
(maximum). The regulator operates in three different
modes, automatically selecting the most efficient mode
of operation. During heavy load conditions, the
TC1303/TC1304 buck converter operates at a high,
fixed frequency (2.0 MHz) using current mode control.
This minimizes output ripple and noise (less than 8 mV
peak-to-peak ripple) while maintaining high efficiency
(typically > 90%). For standby or light load applications,
the buck regulator will automatically switch to a power-
saving Pulse Frequency Modulation (PFM) mode. This
minimizes the quiescent current draw on the battery,
while keeping the buck output voltage in regulation.
The typical buck PFM mode current is 38 A. The buck
regulator is capable of operating at 100% duty cycle,
minimizing the voltage drop from input-to-output for
wide input, battery-powered applications. For fixed-
output voltage applications, the feedback divider and
control loop compensation components are integrated,
eliminating the need for external components. The
buck regulator output is protected against overcurrent,
short circuit and overtemperature. While shut down, the
synchronous buck N-channel and P-channel switches
are off, so the LX pin is in a high-impedance state (this
allows for connecting a source on the output of the
buck regulator as long as its voltage does not exceed
the input voltage).
4.2.1
FIXED-FREQUENCY PWM MODE
While operating in Pulse Width Modulation (PWM)
mode, the TC1303/TC1304 buck regulator switches at
a fixed, 2.0 MHz frequency. The PWM mode is suited
for higher load current operation, maintaining low
output noise and high conversion efficiency. PFM-to-
PWM mode transition is initiated for any of the following
conditions:
Continuous inductor current is sensed
Inductor peak current exceeds 100 mA
The buck regulator output voltage has dropped
out of regulation (step load has occurred)
The typical PFM-to-PWM threshold is 80 mA.
4.2.2
PFM MODE
PFM mode is entered when the output load on the buck
regulator is very light. Once detected, the converter
enters the PFM mode automatically and begins to skip
pulses to minimize unnecessary quiescent current
draw by reducing the number of switching cycles per
second. The typical quiescent current for the switching
regulator is less than 35 A. The transition from PWM
to PFM mode occurs when discontinuous inductor
current is sensed or the peak inductor current is less
than 60 mA (typical). The typical PWM to PFM mode
threshold is 30 mA. For low input-to-output differential
voltages, the PWM-to-PFM mode threshold can be low
due to the lack of ripple current. It is recommended that
VIN1 be one volt greater than VOUT1 for PWM-to-PFM
transitions.
4.3
Low Drop Out Regulator (LDO)
The LDO output is a 300 mA low-dropout linear
regulator that provides a regulated output voltage with
a single 1 F external capacitor. The output voltage is
available in fixed options only, ranging from 1.5V to
3.3V. The LDO is stable using ceramic output
capacitors that inherently provide lower output noise
and reduce the size and cost of the regulator solution.
The quiescent current consumed by the LDO output is
typically less than 40 A, with a typical dropout voltage
of 137 mV at 200 mA. While operating in Dropout
mode, the LDO quiescent current will increase,
minimizing the necessary voltage differential needed
for the LDO output to maintain regulation. The LDO
output
is
protected
against
overcurrent
and
overtemperature conditions.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC1304-CH3EUN | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
| TC1304-CM2EUNTR | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
| TC1304-DC1EUN | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
| TC1304-DI1EMFTR | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
| TC1304-DJ3EUNTR | 0.5 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO10 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1304-VI0EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo/seq RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1304-VI0EMFTR | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo/seq RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1304-VI0EUN | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo/seq RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1304-VI0EUNTR | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo/seq RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1304-VP0EMF | 功能描述:低壓差穩(wěn)壓器 - LDO PWM/LDO combo/seq RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。