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參數(shù)資料
| 型號： | MAX1870AETJ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Step-Up/Step-Down Li+ Battery Charger |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, QCC32 |
| 封裝： | 5 X 5 MM, 0.80 MM HEIGHT, MO-220WHHD-2, TQFN-32 |
| 文件頁數(shù)： | 21/32頁 |
| 文件大小： | 1091K |
| 代理商： | MAX1870AETJ |
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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
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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 Li+ Step Up/Step Down Battery Charger RoHS:否 制造商:Texas Instruments 電池類型: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開發(fā)工具 Evaluation Kit for the MAX1870A RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX1870ETJ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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