Datasheet > LT1512CS8#TR

LT1512CS8#TR

更新时间： 2024-02-01 12:00:28

品牌	Logo	应用领域
凌特 - Linear		电池光电二极管
页数	文件大小	规格书
12页	226K
描述
LT1512 - SEPIC Constant-Current/Constant-Voltage Battery Charger; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C

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技术参数
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LT1512CS8#TR 技术参数

是否Rohs认证：	不符合	生命周期：	Active
包装说明：	SOP,	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.26	模拟集成电路 - 其他类型：	BATTERY CHARGE CONTROLLER
控制模式：	CURRENT-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	25 V	最小输入电压：	2.7 V
标称输入电压：	5 V	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e0	长度：	4.9025 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	8	最高工作温度：	70 °C
最低工作温度：		最大输出电流：	2.7 A
标称输出电压：	1.245 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：	1.752 mm
最大供电电流 (Isup)：	5.5 mA	表面贴装：	YES
切换器配置：	SINGLE	最大切换频率：	580 kHz
技术：	BIPOLAR	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

LT1512CS8#TR 数据手册

LT1512

W U U

APPLICATIONS INFORMATION

CONNECT D2 ANODE HERE IF FULLY CHARGED

BATTERY VOLTAGE IS GREATER THAN 3.5V AND

Q1 MUST BE TURNED OFF IN SHUTDOWN WITH

CONNECT D2 ANODE HERE FOR FULLY

CHARGED BATTERY VOLTAGE LESS

THAN 3.5V. Q1 WILL NOT BE TURNED OFF

STILL ACTIVE

IN SHUTDOWN IF V IS PRESENT

L1 A

•

470k

470pF

1N4148

LT1512

GND

L1 B

SHUTDOWN

S/S

2N7002

1512 F03

Figure 3. Eliminating Divider Current

losstoroidcoresuchasKoolMµ^®,MolypermalloyorMetglas^®

is recommended. Series resistance should be less than

0.1Ωforeachwinding. “Opencore”inductors, suchasrods

or barrels are not recommended because they generate

large magnetic fields which may interfere with other elec-

tronics close to the charger.

Maximum Input Voltage

Maximum input voltage for the circuit in Figure 1 is partly

determined by battery voltage. A SEPIC converter has a

maximum switch voltage equal to input voltage plus output

voltage. The LT1512 has a maximum input voltage of 30V

and a maximum switch voltage of 40V, so this limits

maximum input voltage to 30V, or 40V – V_BAT, whichever

is less. Maximum V_BAT= 40V – V_IN.

Input Capacitor

The SEPIC topology has relatively low input ripple current

compared to other topologies and higher harmonics are

especially low. RMS ripple current in the input capacitor is

less than 0.1A with L = 33µH and less than 0.2A with

L = 15µH. A low ESR 22µF, 25V solid tantalum capacitor

(AVX type TPS or Sprague type 593D) is adequate for most

applications with the following caveat. Solid tantalum ca-

pacitors can be destroyed with a very high turn-on surge

currentsuchaswouldbegeneratedifalowimpedanceinput

source were “hot switched” to the charger input. If this

condition can occur, the input capacitor should have the

highestpossiblevoltagerating,atleasttwicethesurgeinput

voltage if possible. Consult with the capacitor manufacturer

beforeafinalchoiceismade.A2.2µFceramiccapacitorsuch

as the one used for the coupling capacitor can also be used.

Thesecapacitorsdonothaveaturn-onsurgelimitation. The

inputcapacitormustbeconnecteddirectlytotheV_INpinand

the ground plane close to the LT1512.

Shutdown and Synchronization

The dual function S/S pin provides easy shutdown and

synchronization. It is logic level compatible and can be

pulled high or left floating for normal operation. A logic low

on the S/S pin activates shutdown, reducing input supply

currentto12µA. Tosynchronizeswitching, drivetheS/Spin

between 600kHz and 800kHz.

Inductor Selection

L1AandL1Barenormallyjusttwoidenticalwindingsonone

core, althoughtwoseparateinductorscanbeused. Atypical

valueis33µH, whichgivesabout0.25Apeak-to-peakinduc-

tor current. Lower values will give higher ripple current,

which reduces maximum charging current. 15µH can be

used if charging currents are at least 20% lower than the

values shown in the maximum charging current graph.

Higher inductance values give slightly higher maximum

charging current, but are larger and more expensive. A low

KoolMµ is a registered trademark of Magnetics, Inc.

Metglas is a registered trademark of AlliedSignal Inc.

1...4 5 678 9 10...12

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与LT1512CS8#TR相关器件

型号	品牌	获取价格	描述	数据表
LT1512I	Linear	获取价格	SEPIC Constant-Current/ Constant-Voltage Battery Charger
LT1512IN8	Linear	获取价格	SEPIC Constant-Current/ Constant-Voltage Battery Charger
LT1512IN8#PBF	Linear	获取价格	LT1512 - SEPIC Constant-Current/Constant-Voltage Battery Charger; Package: PDIP; Pins: 8;
LT1512IN8#TR	Linear	获取价格	IC 2.7 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDIP8, 0.300 INCH, PLASTIC
LT1512IN8#TRPBF	Linear	获取价格	IC 2.7 A BATTERY CHARGE CONTROLLER, 580 kHz SWITCHING FREQ-MAX, PDIP8, 0.300 INCH, LEAD FR
LT1512IS8	Linear	获取价格	SEPIC Constant-Current/ Constant-Voltage Battery Charger
LT1512IS8#TR	Linear	获取价格	LT1512 - SEPIC Constant-Current/Constant-Voltage Battery Charger; Package: SO; Pins: 8; Te
LT1512IS8#TRPBF	Linear	获取价格	LT1512 - SEPIC Constant-Current/Constant-Voltage Battery Charger; Package: SO; Pins: 8; Te
LT1513	Linear	获取价格	SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger
LT1513	ADI	获取价格	SEPIC 恒定或可编程电流 / 恒定电压电池充电器

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