參數(shù)資料
型號(hào)： LTC4009CUF-2#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： BATTERY CHARGE CONTROLLER, 633 kHz SWITCHING FREQ-MAX, PQCC20
封裝： 4 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-220WGGD-1, QFN-20
文件頁(yè)數(shù)： 5/28頁(yè)
文件大?。?/td> 351K
代理商： LTC4009CUF-2#PBF
4009fd
LTC4009
LTC4009-1/LTC4009-2
be used for a variety of purposes in applications. Table 1
summarizes the state of the three indicator outputs as a
function of LTC4009 operation.
Table 1. LTC4009 Open-Drain Indicator Outputs
ACP
CHRG
ICL
CHARGER STATE
Off
No DC Input (Shutdown)
On
Off
Shutdown, Reverse Current or
DCIN Overvoltage
On
Off
Bulk Charge
On
25A
Off
Low Current Charge or Initial
CLP-BAT < 100mV
On
Input Current Limit During Bulk
Charge
On
25A
On
Input Current Limit During Low
Current Charge
On
Off
On
Input Current Limit During DCIN
Overvoltage
PWM Controller
The LTC4009 uses a synchronous step-down architec-
ture to produce high operating efficiency. The nominal
operating frequency of 550kHz allows use of small filter
components.Thefollowingconceptualdiscussionofbasic
PWM operation references Figure 1.
The voltage across the external charge current sense
resistor RSENSE is measured by current amplifier, CA. This
instantaneous current (VSENSE/RIN) is fed to the PROG pin
whereitisaveragedbyanexternalcapacitorandconverted
to a voltage by the programming resistor RPROG between
PROG and GND. The PROG voltage becomes the average
operaTion
charge current input signal to error amplifier, EA. EA also
receives loop control information from the battery voltage
feedback input VFB and the adapter input current limit
circuit. The ITH output of the error amplifier is a scaled
control voltage for one input of the PWM comparator, CC.
ITH sets a peak inductor current threshold, sensed by R1,
to maintain the desired average current through RSENSE.
The current comparator output does this by switching the
state of the RS latch at the appropriate time.
At the beginning of each oscillator cycle, the PWM clock
sets the RS latch and turns on the external topside NFET
(bottom-sidesynchronousNFEToff)torefreshthecurrent
carried by the external inductor L1. The inductor current
andvoltageacrossRSENSEbegintoriselinearly.CAbuffers
this instantaneous voltage rise and applies it to CC with
gain supplied by R1. When the voltage across R1 exceeds
the peak level set by the ITH output of EA, the top FET
turns off and the bottom FET turns on. The inductor cur-
rent then ramps down linearly until the next rising PWM
clock edge. This closes the loop and sources the correct
inductorcurrenttomaintainthedesiredparameter(charge
current, battery voltage, or input current). To produce a
near constant frequency, the PWM oscillator implements
the equation:
t
CLP BAT
CLP
kHz
OFF =
–
550
Repetitive, closed-loop waveforms for stable PWM opera-
tion appear in Figure 2.
Figure 2. PWM Waveforms
ON
OFF
INDUCTOR
CURRENT
TOP FET
BOTTOM FET
ON
tOFF
THRESHOLD
SET BY ITH
VOLTAGE
4009 F02
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LTC4009IUF#TRPBF 功能描述:IC CTLR BATT CHARGER 20QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
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