Datasheet > 电源电路 > 开关式稳压器或控制器> LTC1983ES6-5#TRPBF

LTC1983ES6-5#TRPBF

更新时间： 2024-01-10 06:12:15

品牌	Logo	应用领域
凌特 - Linear		稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管泵
页数	文件大小	规格书
12页	180K
描述
LTC1983 - 100mA Regulated Charge-Pump Inverters in ThinSOT; Package: SOT; Pins: 6; Temperature Range: -40°C to 85°C

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LTC1983ES6-5#TRPBF 技术参数

是否Rohs认证：	符合	生命周期：	Transferred
零件包装代码：	SOT	包装说明：	VSSOP, TSOP6,.11,37
针数：	6	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.1	模拟集成电路 - 其他类型：	SWITCHED CAPACITOR REGULATOR
最大输入电压：	5.5 V	最小输入电压：	5 V
标称输入电压：	5 V	JESD-30 代码：	R-PDSO-G6
JESD-609代码：	e3	长度：	2.9 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	6	最高工作温度：	70 °C
最低工作温度：		最大输出电流：	0.1 A
标称输出电压：	-5 V	封装主体材料：	PLASTIC/EPOXY
封装代码：	VSSOP	封装等效代码：	TSOP6,.11,37
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, VERY THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	认证状态：	Not Qualified
座面最大高度：	1 mm	子类别：	Other Analog ICs
表面贴装：	YES	切换器配置：	DOUBLER INVERTER
最大切换频率：	900 kHz	技术：	CMOS
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	0.95 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	1.625 mm	Base Number Matches：	1

LTC1983ES6-5#TRPBF 数据手册

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LTC1983-3/LTC1983-5

OPERATIO

(Refer to Block Diagram)

The LTC1983-3/LTC1983-5 use a switched capacitor

charge pump to invert a positive input voltage to a regu-

lated –3V ±4% (LTC1983-3) or –5 ±4% (LTC1983-5)

output voltage. Regulation is achieved by sensing the

output voltage through an internal resistor divider and

enablingthechargepumpwhentheoutputvoltagedroops

above the upper trip point of COMP1. When the charge

pump is enabled, a 2-phase, nonoverlapping clock con-

trols the charge pump switches. Clock 1 closes the S1

switches which enables the flying capacitor to charge up

to the V_INvoltage. Clock 2 closes the S2 switches that

invert the V_INvoltage and connect the bottom plate of C_FLY

to the output capacitor at V_OUT. This sequence of charging

and discharging continues at a free-running frequency of

900kHz (typ) until the output voltage has been pumped

down to the lower trip point of COMP1 and the charge

pump is disabled. When the charge pump is disabled, the

LTC1983 draws only 25µA (typ) from V_INwhich provides

high efficiency at low load conditions.

For all R_OUTvalues, check the corresponding curves in

the Typical Performance Characteristics section (Note:

_FLY= 1µF for all R_OUTcurves). The R_OUTvalue will be

different for different flying caps, as shown in the follow-

ing equation:

R_OUT= R_OUT(curve)– 1.11Ω +

f_OSC•C_FLY

Short-Circuit/Thermal Protection

During short-circuit conditions, the LTC1983 will draw

several hundred milliamps from V_INcausing a rise in the

junction temperature. On-chip thermal shutdown cir-

cuitry disables the charge pump once the junction tem-

peratureexceeds≈155°C,andreenablesthechargepump

once the junction temperature falls back to ≈145°C. The

LTC1983 will cycle in and out of thermal shutdown

indefinitely without latchup or damage until the V_OUT

short is removed.

In shutdown mode, all circuitry is turned off and the part

draws less than 1µA from the V_INsupply. V_OUTis also

disconnected from V_INand C_FLY. The SHDN pin has a

threshold of approximately 0.7V. The part enters shut-

down when a low is applied to the SHDN pin . The SHDN

pin should not be floated; it must be driven with a logic

high or low.

Capacitor Selection

For best performance, it is recommended that low ESR

capacitors be used for both C_INand C_OUTto reduce noise

and ripple. The C_INand C_OUTcapacitors should be either

ceramic or tantalum and should be 4.7µF or greater.

Aluminum electrolytic are not recommended because of

theirhighequivalentseriesresistance(ESR).Ifthesource

impedanceisverylow, C_INmaynotbeneeded. Increasing

the size of C_OUTto 10µF or greater will reduce output

voltage ripple. The flying capacitor and C_OUTshould also

have low equivalent series inductance (ESL). The board

layoutiscriticalaswellforinductanceforthesamereason

(the suggested board layout should be used).

Open-Loop Operation

TheLTC1983-3/LTC1983-5invertingchargepumpsregu-

lateat–3V/–5Vrespectively,unlesstheinputvoltageistoo

low or the output current is too high. The equations for

output voltage regulation are as follows:

V_IN–5.06V > I_OUT• R_OUT(LTC1983-5)

V_IN–3.06V > I_OUT• R_OUT(LTC1983-3)

Aceramiccapacitorisrecommendedfortheflyingcapaci-

tor with a value in the range of 0.1µF to 4.7µF. Note that

a large value flying cap (>1µF) will increase output ripple

unless C_OUTis also increased. For very low load applica-

tions, C1 may be reduced to 0.01µF to 0.047µF. This will

reduce output ripple at the expense of efficiency and

maximum output current.

If this condition is not met, then the part will run in open

loop mode and act as a low output impedance inverter for

which the output voltage will be:

V_OUT= –[V_IN–(I_OUT• R_OUT)]

sn1983 1983fs

1...3 4 567 8 9...12

中文翻译

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