參數(shù)資料
型號(hào)： MAX1870A
廠(chǎng)商： Maxim Integrated Products, Inc.
英文描述： Step-Up/Step-Down Li+ Battery Charger
中文描述： 升/降壓型Li+電池充電器
文件頁(yè)數(shù)： 21/32頁(yè)
文件大?。?/td> 1091K
代理商： MAX1870A
M
Step-Up/Step-Down
Li+ Battery Charger
______________________________________________________________________________________
21
STATE B
STATE A
PRECALCULATED STEP-DOWN ON-TIME
VALLEY REGULATED OFF-TIME
dl
dt
V
IN
- V
OUT
L
=
dl
dt
V
OUT
L
=
V
IN
> 1.4 x V
BATT
DUTY = V
IN
/ V
OUT
Figure 6. MAX1870A Step-Down Inductor Current Waveform
signal based on the integrated error of the input cur-
rent, charge current, and battery voltage. The error sig-
nal, determined by the lowest voltage clamp (LVC),
sets the threshold for current-mode regulation. The fol-
lowing comparators are used for regulation:
IMIN:
The MAX1870A operates in discontinuous con-
duction if LVC is below 0.15V, and does not initiate
another step-down on-time. In discontinuous step-up
conduction, the peak current is set by IMIN. The peak
inductor current in discontinuous step-up mode is:
where V
IMIN
is the IMIN comparator threshold, 0.15V,
and A
CSI
is the charge current-sense amplifier gain,
18V/V.
CCMP:
CCMP compares the current-mode control
I
V
A
x RS
PK
IMIN
CSI
>
2
STATE B
STATE C
PRECALCULATED OFF-TIME
PEAK REGULATED ON-TIME
dl
dt
V
IN
- V
OUT
L
=
dl
dt
V
OUT
L
=
V
IN
> 0.9 x V
BATT
DUTY = 1 - V
IN
/ V
OUT
Figure 7. Step-Up Inductor-Current Waveform
相關(guān)PDF資料
PDF描述
MAX1870AETJ Step-Up/Step-Down Li+ Battery Charger
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MAX1873TEEE Simple Current-Limited Switch-Mode Li Charger Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1870AETJ 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1870AETJ+ 功能描述:電池管理 Li+ Step Up/Step Down Battery Charger RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1870AETJ+T 功能描述:電池管理 Li+ Step Up/Step Down Battery Charger RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1870AETJ-T 功能描述:電池管理 RoHS:否 制造商:Texas Instruments 電池類(lèi)型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1870AEVKIT 功能描述:電源管理IC開(kāi)發(fā)工具 Evaluation Kit for the MAX1870A RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類(lèi)型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
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