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參數(shù)資料

型號(hào)：	TC1304-ZJ2EUNTR
元件分類：	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?。?/td>	756K
代理商：	TC1304-ZJ2EUNTR

2008 Microchip Technology Inc.

DS21949C-page 21

TC1303A/TC1303B/TC1303C/TC1304

4.0

DETAILED DESCRIPTION

4.1

Device Overview

The

TC1303/TC1304

combines

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

protected

against

overcurrent

and

overtemperature conditions.

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
TC1304-ZP0EMF	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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TC1304-ZP0EMFTR	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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TC1304-ZP0EUN	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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TC1304-ZP0EUNTR	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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TC1304-ZS0EMF	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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20

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