參數(shù)資料
型號： MAX1677
廠商： Maxim Integrated Products, Inc.
元件分類： DC/DC變換器
英文描述： Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter
中文描述： 緊湊的、高效率、雙輸出、升壓型和LCD偏置DC-DC轉(zhuǎn)換器
文件頁數(shù)： 9/16頁
文件大?。?/td> 201K
代理商： MAX1677
M
Compac t, High-Effic ienc y, Dual-Output
S tep-Up and LCD Bias DC-DC Converter
_______________________________________________________________________________________
9
Main Boost Converter (MBC)
The MBC operates either in PFM mode, 300kHz PWM
mode, or externally synchronized PWM mode as select-
ed by the CLK/SEL input (Table 2). PWM mode offers
fixed-frequency operation and maximum output power.
PFM mode offers the lowest IC operating current. LX
current limit is reduced in PFM mode to increase effi-
ciency and minimize output ripple.
PWM Mode
When CLK/SEL is high, the MAX1677 operates in its
high-power, low-noise PWM mode, switching at the
300kHz internal oscillator frequency. The MOSFET
switch pulse-width is modulated to control the power
transferred on each switching cycle and regulate the
Table 1. Main Boost Converter Available
Output Current
ON
OUT
START-UP OSC
IN
POL
I
LCDLX
SUCLK
MAIN DC-DC
839k
QP
501k
QN
CLK/SEL
POUT
OUT
LX
PGND
50% REF
FB
LBO
LBI
LCDON
LCDLX
LCDGND
ON
CLK
EA
ST
EA
LCDDRV
CL
I
LCDLX
POL
LCD BIAS
ON
ON
REF
ON
LCDPOL
LCDFB
GND
REF
90% REF
2.25V
START-UP
LCD ON
REFERENCE
ISET/POL SENSE
MAX1677
Figure 1. Functional Block Diagram
NUMBER OF
CELLS
1 Alk/NiCd/NiMH
1 Alk/NiCd/NiMH
2 Alk/NiCd/NiMH
2 Alk/NiCd/NiMH
140/150
100/70
350/170
260/125
MBC OUTPUT
CURRENT
(mA)
PWM/PFM
1.2
2.4
2.4
1.2
INPUT
VOLTAGE
(V)
MBC
OUTPUT
VOLTAGE
(V)
3.3
5
3.3
5
1 Alk/NiCd/NiMH
or 1 Li-Ion
3.6
5
350/170
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1677EEE 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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
MAX1677EEE+ 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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
MAX1677EEE+T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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
MAX1677EEE-T 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Compact Step-Up & LCD Bias DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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
MAX1677EVKIT 功能描述:電源管理IC開發(fā)工具 Evaluation Kit for the MAX1677 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
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