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LTC1265CS-3.3#PBF

更新时间： 2024-02-03 23:33:06

品牌	Logo	应用领域
凌特 - Linear		转换器
页数	文件大小	规格书
16页	230K
描述
LTC1265 - 1.2A, High Efficiency Step-Down DC/DC Converter; Package: SO; Pins: 14; Temperature Range: 0°C to 70°C

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LTC1265CS-3.3#PBF 技术参数

是否Rohs认证：	不符合	生命周期：	Active
包装说明：	PLASTIC, SOIC-14	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.74	Is Samacsys：	N
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制模式：	CURRENT-MODE
控制技术：	CONSTANT OFF TIME	最大输入电压：	12 V
最小输入电压：	5.4 V	标称输入电压：	10 V
JESD-30 代码：	R-PDSO-G14	JESD-609代码：	e0
长度：	8.65 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	14
最高工作温度：	70 °C	最低工作温度：
最大输出电流：	1.2 A	标称输出电压：	3.3 V
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	235	认证状态：	Not Qualified
座面最大高度：	1.75 mm	最大供电电流 (Isup)：	2.4 mA
表面贴装：	YES	切换器配置：	BUCK
最大切换频率：	700 kHz	技术：	CMOS
温度等级：	COMMERCIAL	端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	20
宽度：	3.9 mm	Base Number Matches：	1

LTC1265CS-3.3#PBF 数据手册

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LTC1265/LTC1265-3.3/LTC1265-5

OPERATION ^{(Refer to Functional Diagram)}

capacitor discharges past V_TH1until its voltage drops

below V_TH2. Comparator S then trips and a sleep signal is

generated. Thecircuitnowentersintosleepmodewiththe

power MOSFET turned off. In sleep mode, the LTC1265 is

in standby and the load current is supplied by the output

capacitor. All unused circuitry is shut off, reducing quies-

cent current from 2mA to 160µA. When the output capaci-

tor discharges by the amount of the hysteresis of the

comparatorV,theP-channelswitchturnsonagainandthe

process repeats itself. During Burst Mode operation the

To avoid the operation of the current loop interfering with

BurstModeoperation, abuilt-inoffsetV_OSisincorporated

in the gain stage. This prevents the current from increas-

inguntiltheoutputvoltagehasdroppedbelowaminimum

threshold.

Using constant off-time architecture, the operating fre-

quency is a function of the voltage. To minimize the

frequencyvariationasdropoutisapproached,theoff-time

controller increases the discharge current as V_INdrops

below V_OUT+ 2V. In dropout the P-channel MOSFET is

turned on continuously (100% duty cycle) providing low

dropout operation with V_OUTV_IN.

peak inductor current is set at 25mV/R_SENSE

W U U

APPLICATIONS INFORMATION

The basic LTC1265 application circuit is shown in

Figure 1. External component selection is driven by the

150mV

25mV

2 • R

(Amps)

OUT(MAX)

–

SENSE

loadrequirement, andbeginswiththeselectionofR_SENSE

137.5mV

Once R_SENSEis known, C_Tand L can be chosen. Next, the

(Amps)

SENSE

Schottky diode D1 is selected followed by C_INand C_OUT

Solving for R_SENSEand allowing a margin of variations in

the LTC1265 and extended component values yields:

R_SENSESelection for Output Current

R_SENSEis chosen based on the required output current.

Withthecurrentcomparatormonitoringthevoltagedevel-

oped across R_SENSE, the threshold of the comparator

determines the peak inductor current. Depending on the

load current condition, the threshold of the comparator

liesbetween25mV/R_SENSEand150mV/R_SENSE. Themaxi-

mum output current of the LTC1265 is:

100mV

OUT(MAX)

(Ω)

SENSE

TheLTC1265isratedwithacapabilitytosupplyamaximum

of1.2Aofoutputcurrent.Therefore, theminimumvalueof

R_SENSEthat can be used is 0.083Ω. A graph for selecting

R_SENSEversus maximum output is given in Figure 2.

150mV

RIPPLE

(Amps)

OUT(MAX)

–

0.5

0.4

0.3

0.2

0.1

SENSE

where I_RIPPLEis the peak-to-peak inductor ripple current.

At a relatively light load, the LTC1265 is in Burst Mode

operation. In this mode the peak inductor current is set at

25mV/R_SENSE.TofullybenefitfromBurstModeoperation,

the inductor current should be continuous during burst

periods. Hence, the peak-to-peak inductor ripple current

must not exceed 25mV/R_SENSE

Toaccountforlightandheavyloadconditions,theI_OUT(MAX)

is then given by:

0.2

0.4

0.6

0.8

MAXIMUM OUTPUT CURRENT (A)

1265 G10

Figure 2. Selecting R_SENSE

1...3 4 567 8 9...16

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