參數(shù)資料
型號(hào)： MAX1644
廠商： Maxim Integrated Products, Inc.
英文描述： Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting
中文描述： 2A、低電壓、降壓型穩(wěn)壓器，內(nèi)置同步整流與開(kāi)關(guān)
文件頁(yè)數(shù)： 31/32頁(yè)
文件大?。?/td> 183K
代理商： MAX1644
M
Advanc ed Chemistry-Independent, Level 2
Battery Charger with Input Current Limiting
______________________________________________________________________________________
31
Figure 1. Use 1μF ceramic capacitors from CSSP and
CSSN to GND. Smaller 0.1μF ceramic capacitors can
be used on the CSIP and CSIN inputs to GND since the
current into the battery is continuous. Place these
capacitors next to the single-point ground directly
under the MAX1645.
Layout and Bypassing
Bypass DCIN with a 1μF to GND (Figure 1). D4 protects
the device when the DC power source input is
reversed. A signal diode for D4 is adequate as DCIN
only powers the LDO and the internal reference.
Bypass LDO, BST, DLOV, and other pins as shown in
Figure 1.
Good PC board layout is required to achieve specified
noise, efficiency, and stable performance. The PC
board layout artist must be given explicit instructions,
preferably a pencil sketch showing the placement of
power-switching components and high-current routing.
Refer to the PC board layout in the MAX1645 evaluation
kit manual for examples. A ground plane is essential for
optimum performance. In most applications, the circuit
will be located on a multilayer board, and full use of the
four or more copper layers is recommended. Use the
top layer for high-current connections, the bottom layer
for quiet connections (REF, CCV, CCI, CCS, DAC,
DCIN, V
DD
, and GND), and the inner layers for an unin-
terrupted ground plane.
Use the following step-by-step guide:
1) Place the high-power connections first, with their
grounds adjacent:
Minimize current-sense resistor trace lengths and
ensure accurate current sensing with Kelvin con-
nections.
Minimize ground trace lengths in the high-current
paths.
Minimize other trace lengths in the high-current
paths:
Use > 5mm-wide traces
Connect C1 and C2 to high-side MOSFET
(10mm max length)
Connect rectifier diode cathode to low-side.
MOSFET (5mm max length)
LX node (MOSFETs, rectifier cathode, inductor:
15mm max length). Ideally, surface-mount
power components are flush against one another
with their ground terminals almost touching.
These high-current grounds are then connected
to each other with a wide, filled zone of top-
layer copper so they do not go through vias.
The resulting top-layer subground plane is con-
nected to the normal inner-layer ground plane
at the output ground terminals, which ensures
that the IC’s analog ground is sensing at the
supply’s output terminals without interference
from IR drops and ground noise. Other high-
current paths should also be minimized, but
focusing primarily on short ground and current-
sense connections eliminates about 90% of all
PC board layout problems.
2) Place the IC and signal components. Keep the main
switching nodes (LX nodes) away from sensitive ana-
log components (current-sense traces and REF
capacitor).
Important:
The IC must be no further
than 10mm from the current-sense resistors.
Keep the gate drive traces (DHI, DLO, and BST)
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. Place the current-sense
input filter capacitors under the part, connected
directly to the GND pin.
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.
Chip Information
TRANSISTOR COUNT: 6996
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1644EAE 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1644EAE/GH9 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1644EAE/GH9-T 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1644EAE+ 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 2A Step-Dow w/Synch Rectification RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX1644EAE+T 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 2A Step-Dow w/Synch Rectification RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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