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參數(shù)資料
| 型號： | MAX1677EEE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter |
| 中文描述： | 0.8 A SWITCHING REGULATOR, 360 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-16 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 201K |
| 代理商： | MAX1677EEE |
M
Compac t, High-Effic ienc y, Dual-Output
S tep-Up and LCD Bias DC-DC Converter
10
______________________________________________________________________________________
output voltage. In PWM mode, the MBC can supply up
to 350mA. Switching harmonics generated by the fixed-
frequency operation are consistent and easily filtered.
During PWM operation, the rising edge of the internal
clock sets a flip-flop, which turns on the N-channel
MOSFET (Figure 4). The switch turns off when the sum
of the voltage-error, slope-compensation, and current-
feedback signals trips the multi-input comparator and
resets the flip-flop; the switch remains off for the rest of
the cycle. Changes in the output voltage error signal
shift the inductor current level and modulate the MOS-
FET pulse width.
Clock-Synchronized PWM
The MAX1677 operates as a clock-synchronized cur-
rent-mode PWM when a clock signal (200kHz to
400kHz) is applied to CLK/SEL. This allows switching
harmonics to be positioned to avoid sensitive frequen-
cy bands, such as those near IF frequencies in wireless
applications.
Low Power PFM Mode
Pulling CLK/SEL low places the MAX1677 in low-power
standby mode. During standby mode, PFM operation
regulates the output voltage by transferring a fixed
amount of energy during each cycle, and then modulat-
ing the switching frequency to control the power deliv-
ered to the output. The device switches only as needed
to service the load, resulting in the highest possible effi-
ciency at light loads and an operating current of only
20μA. The MBC can supply up to 170mA when in PFM
mode (Table 1).
During PFM operation, the error comparator detects
when the output voltage is out of regulation and sets a
MAX1677
OUT
R3
10
C4
0.1
μ
F
POUT
LX
LCDLX
REF
FB
R2
R1
C5
0.1
μ
F
C1
100
μ
F
C2
100
μ
F
V
IN
3.3V MAIN
BOOST OUTPUT
L2
10
μ
H
L1
10
μ
H
C3
4.7
μ
F
LCD BOOST OUTPUT
D2
MBR0530
LCDGND
LCDFB
GND
LCDON
CLK/SEL
ON
LCDPOL
PGND
Figure 2. LCD Converter in Positive Mode
MAX1677
OUT
R3
10
C4
0.1
μ
F
POUT
LX
LCDLX
REF
FB
C5
0.1
μ
F
C6
0.1
μ
F
R2
R1
C1
100
μ
F
C2
100
μ
F
V
IN
3.3V MAIN
BOOST OUTPUT
L2
10
μ
H
L1
10
μ
H
C3
4.7
μ
F
-LCD BOOST
OUTPUT
D2
MBR0530
D3
MBR0530
LCDGND
LCDFB
GND
LCDON
CLK/SEL
ON
LCDPOL
PGND
Figure 3. LCD Converter in Negative Mode
R
S
Q
OSC
PWM-MODE
CURRENT-
LIMIT LEVEL
REF
FEEDBACK
POUT
LX
PGND
P
N
Figure 4. Controller Block Diagram in PWM Mode
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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+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 |
| MAX1678ESA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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