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參數(shù)資料
| 型號： | MAX685ETG |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD |
| 中文描述： | 0.44 A DUAL SWITCHING CONTROLLER, 480 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, 0.8 MM HEIGHT, MO-20, TQFN-24 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 344K |
| 代理商： | MAX685ETG |
The current into the LXN pin is sensed to measure the
inductor current. The MAX685 controls the inductor cur-
rent to regulate both the positive and negative output
voltages.
SEQ and Power OK (POK)
The SEQ pin controls the power-up sequence. If SEQ is
low, the positive output is disabled until the negative
output is within 90% of its regulation point. If SEQ is
high, the negative output is disabled until the positive
output is within 90% of its regulation point. The power-
OK output (POK) indicates that both output voltages
are in regulation. When both outputs are within 90% of
their regulation points, POK becomes high impedance.
Should one or both of the output voltages fall below
90% of their regulation points, POK pulls to ground.
POK can sink up to 2mA. To reduce current consump-
tion, POK is high impedance while the part is in shut-
down. When coming out of shutdown, POK remains
high impedance for 50ns (typ) before going low.
Connect POK to VDD through a 100k
resistor.
Synchronization/Internal
Frequency Selection
The MAX685 operates at a fixed switching frequency.
Set the operating frequency using the SYNC pin. If
SYNC is grounded, the part operates at the internally set
220kHz frequency. When SYNC is connected to VDD,
the part operates at 400kHz. The MAX685 can also be
synchronized to signals between 200kHz and 480kHz.
Note that each output switches at half the oscillator or
synchronized frequency. Since the actual switching fre-
quency is one-half the applied clock signal, drive SYNC
at twice the desired switching frequency.
MAX685
Dual-Output (Positive and Negative),
DC-DC Converter for CCD and LCD
_______________________________________________________________________________________
7
Figure 1. Functional Diagram
NEGATIVE
ERROR
AMP
TO VOUT-
FBN
FBP
TO VOUT+
REF
POSITIVE
ERROR
AMP
1.25V
REF
CONTROL
LOGIC
POK
VP
VDD
P
N
PGND
GND
SYNC
SEQ
SHDN
LXN
D2
D1
VOUT-
VOUT+
LXP
MAX685
+15V
+5V
0V
-7.5V
LXN
LXP
Figure 2. LXN and LXP Waveforms (see also Figure 5)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX685ETG+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 DC/DC Converter for CCD & LCD 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 |
| MAX685ETG+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 DC/DC Converter for CCD & LCD 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 |
| MAX685ETG-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 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 |
| MAX685EUE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX685EVKIT | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Evaluation Kit for the MAX685 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 |
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