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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)： | 29/32頁 |
| 文件大?。?/td> | 1091K |
| 代理商： | MAX1870AETJ |
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M
Step-Up/Step-Down
Li+ Battery Charger
______________________________________________________________________________________
29
Layout And Bypassing
Bypass DCIN with a 1μF to ground (Figure 1). Optional
diodes D1 and D2 protect the MAX1870A when the DC
power-source input is reversed. A signal diode for D1 is
adequate because DCIN only powers the LDO and the
internal reference. Good PC board layout is required to
achieve specified noise, efficiency, and stable perfor-
mance. The PC board layout artist must be given
explicit instructions—preferably, a pencil sketch show-
ing the placement of the power-switching components
and high-current routing. Refer to the PC board layout
in the MAX1870A evaluation kit for examples. A ground
plane is essential for optimum performance. In most
applications, the circuit is located on a multilayer
board, and full use of the four or more copper layers is
recommended. Use the top layer for high-current con-
nections (PGND, DHI, VHP, VHN, BLKP, and DLOV),
the bottom layer for quiet connections (CSSP, CSSN,
CSSS, CSIP, CSIN, REF, CCV, CCI, CCS, DCIN, LDO
and GND), and the inner layers for an uninterrupted
ground plane. Use the following step-by-step guide:
1) Place the high-power connections first, with their
grounds adjacent:
Minimize the current-sense resistor trace lengths,
and ensure accurate current sensing with Kelvin
connections. Use independent branches for CSSP,
CSSS, CSSN, CSIP, and CSIN.
Minimize ground trace lengths in the high-current
paths.
Minimize other trace lengths in the high-current paths.
Use >5mm wide traces for high-current paths.
Ideally, surface-mount power components are flush
against one another with their ground terminals almost
touching. These high-current grounds are then connect-
ed to each other with a wide, filled zone of top-layer cop-
per, so they do not go through vias. Other high-current
paths should also be minimized, but focus primarily on
short ground and current-sense connections to eliminate
about 90% of all PC board layout problems.
2) Place the IC and signal components. Keep the main
switching nodes (inductor connectons) away from
sensitive analog components (current-sense traces
and REF capacitor).
Important: the IC must be no
further than 10mm from the current-sense resis-
tors.
Keep the gate-drive traces (DHI and DBST)
shorter than 20mm, and route them away from the
current-sense lines and REF. Place ceramic bypass
capacitors close to the IC. The bulk capacitors can
be placed further away. Bypass CSSP, CSSN, CSIN,
and CSIP to analog GND to reduce switching noise
and maintain input-current and charger-current accu-
racy. Place the current-sense input filter capacitors
under the part, connected directly to GND.
3) Use a single-point star ground placed directly
below the part. Connect the input ground trace,
power ground (subground plane), and normal
ground to this node.
Figure 14 shows a partial layout of the power path and
components. Refer to the EV kit data sheet for more
information.
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| MAX1873SEEE | Simple Current-Limited Switch-Mode Li Charger Controller |
| MAX1873REEE | Simple Current-Limited Switch-Mode Li Charger Controller |
| MAX1873TEEE | Simple Current-Limited Switch-Mode Li Charger Controller |
| MAX1874 | MAX1874 Evaluation Kit |
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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