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参数资料
| 型号： | LTC4009IUF#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20 |
| 文件页数： | 3/28页 |
| 文件大小： | 351K |
| 代理商： | LTC4009IUF#TRPBF |
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4009fd
LTC4009
LTC4009-1/LTC4009-2
operaTion
Overview
The LTC4009 is a synchronous step-down (buck) current
mode PWM battery charger controller. The maximum
charge current is programmed by the combination of a
charge current sense resistor (RSENSE), matched input
resistors (RIN, Figure 1), and a programming resistor
(RPROG) between the PROG and GND pins. Battery volt-
age is programmed either with an external resistor divider
between FBDIV and GND (LTC4009) or two digital battery
voltage select pins (LTC4009-1/LTC4009-2). In addition,
the PROG pin provides a linearized voltage output of the
actual charge current.
The LTC4009 family does not have any built-in charge
termination and is flexible enough for charging any type
ofbatterychemistry.ThesearebuildingblockICsintended
for use with an external circuit, such as a microcontroller,
capable of managing the entire algorithm required for
the specific battery being charged. Each member of the
LTC4009familyfeaturesashutdowninputandvariousstate
indicatoroutputs,allowingeasyanddirectmanagementby
a wide range of external (digital) charge controllers. Due
to the popularity of rechargeable lithium-ion chemistries,
the LTC4009-1 and LTC4009-2 also offer internal precision
resistors that can be digitally selected to produce one of
four preset output voltages for simplified design of those
charger types.
Shutdown
The LTC4009 remains in shutdown until DCDIV exceeds
1.2V, and SHDN is driven above 1.4V. In shutdown, current
drain from the battery is reduced to the lowest possible
level,therebyincreasingstandbytime.Wheninshutdown,
the ITH pin is pulled to GND and the CHRG, ICL, FET gate
drivers and INTVDD output are all disabled. The ACP status
output indicates sensed adapter input voltage during all
LTC4009 states. Charging can be stopped at any time by
forcing SHDN below 300mV.
Soft-Start
Exitingtheshutdownstateenablesthechargerandreleases
the ITH pin. When enabled, switching will not begin until
CLP exceeds BAT by 100mV and ITH exceeds a threshold
that assures initial current will be positive (about 5% to
25%ofthemaximumprogrammedcurrent).Tolimitinrush
current, soft-start delay is created with the compensation
values used on the ITH pin. Longer soft-start times can be
realized by increasing the filter capacitor on ITH, if reduced
loop bandwidth is acceptable. The actual charge current at
the end of soft-start will depend on which loop (current,
voltage or adapter limit) is in control of the PWM. If this
currentisbelowthatrequiredbytheITHstart-upthreshold,
theresultingchargecurrenttransientdurationdependson
loop compensation but is typically less than 100s.
Bulk Charge
When soft-start is complete, the LTC4009 begins sourc-
ing the current programmed by the external components
connected to CSP, CSN and PROG. Some batteries may
requireasmallconditioningtricklecurrentiftheyareheavily
discharged.AsshownintheApplicationsInformationsec-
tion, the LTC4009 can address this need through a variety
of low current circuit techniques on the PROG pin. Once
a suitable cell voltage has been reached, charge current
can be switched to a higher, bulk charge value.
End-of-Charge and CHRG Output
As the battery approaches the programmed output volt-
age, charge current will begin to decrease. The open-
drain CHRG output can indicate when the current drops
to 10% of its programmed full-scale value by turning off
the strong pull-down (open-drain FET) and turning on a
weak 25A pull-down current. This weak pull-down state
is latched until the part enters shutdown or the sensed
current rises to roughly C/6. C/10 indication will not be
set if charge current has been reduced due to adapter
input current limiting or DCIN/battery overvoltage. As
the charge current approaches 0A, the PWM continues to
operate in full continuous mode. This avoids generation
of audible noise, allowing bulk ceramic capacitors to be
used in the application.
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4009IUF#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-1#TRPBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-2#TRPBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009IUF-1#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
| LTC4009CUF-2#PBF | BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4010 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4010CFE | 制造商:Linear Technology 功能描述:Battery Charger NiCD/NiMH 16-Pin TSSOP EP |
| LTC4010CFE#PBF | 功能描述:IC CHARGER NIMH/NICD 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4010CFE#PBF | 制造商:Linear Technology 功能描述:CHARGER BATT NICKEL 34V 16TSSOP 制造商:Linear Technology 功能描述:CHARGER, BATT, NICKEL, 34V, 16TSSOP |
| LTC4010CFE#TRPBF | 功能描述:IC CHARGER NIMH/NICD 16-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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