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參數(shù)資料
| 型號(hào)： | 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)： | 22/32頁 |
| 文件大?。?/td> | 1091K |
| 代理商： | MAX1870AETJ |
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M
Step-Up/Step-Down
Li+ Battery Charger
22
______________________________________________________________________________________
point, LVC, to the inductor current. In step-down mode,
the off-time (state A) is terminated when the inductor
current falls below the current threshold set by LVC. In
step-up mode, the on-time (state C) is terminated when
the inductor current rises above the current threshold
set by LVC.
IMAX:
The IMAX comparators provide a cycle-by-cycle
inductor current limit. This circuit compares the induc-
tor current (CSI in step-down mode or CSS in step-up
mode) to the internally fixed cycle-by-cycle current
limit. The current-sense voltage limit is 200mV. With
RS1_ = RS2 = 30m
, which corresponds to 6.7A. If the
inductor current-sense voltage is greater than V
IMAX
(200mV), a step-up on-time is terminated or a step-
down on-time is not permitted.
ZCMP:
The ZCMP comparator detects when the induc-
tor current crosses zero. If the ZCMP output goes high
during a step-down off-time, the MAX1870A switches to
the idle state (state D) to conserve power.
Switching Frequency
The MAX1870A includes input and output-voltage feed-
forward to maintain pseudo-fixed-frequency (400kHz)
operation. The time in state B is set according to the
input voltage, output voltage, and a time constant. In
step-up/step-down mode the switching frequency is
STATE C
STATE B
STATE A
STATE B
STATE A
STATE B
STATE C
STATE B
A)
B)
MINIMUM
STEP-DOWN
OFF-TIME
PRECALCULATED STEP-UP
OFF-TIME
PRECALCULATED STEP-DOWN
ON-TIME
PRECALCULATED STEP-DOWN
ON-TIME
MINIMUM
STEP-UP
ON-TIME
PEAK REGULATED
STEP-UP
ON-TIME
VALLEY REGULATED
STEP-DOWN
OFF-TIME
dl
dt
V
BATT
- V
IN
L
=
dl
dt
V
IN
L
=
dl
dt
V
BATT
L
=
Figure 8. MAX1870A Step-Up/Step-Down 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(píng)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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