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參數資料
| 型號： | MAX685C/D |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD |
| 中文描述： | 0.44 A SWITCHING REGULATOR, 480 kHz SWITCHING FREQ-MAX, UUC16 |
| 文件頁數： | 1/13頁 |
| 文件大小： | 394K |
| 代理商： | MAX685C/D |
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
General Description
The MAX685 DC-DC converter provides low-noise dual
outputs for powering CCD imaging devices and LCDs.
This device uses a single inductor to provide indepen-
dently regulated positive and negative outputs.
Integrated power switches are included in a small 24-
Pin 4mm x 4mm Thin QFN package to save space and
reduce cost. A 16-pin QSOP package is also available.
Each output delivers up to 10mA from a +2.7V to +5.5V
input voltage range. Output voltages are set indepen-
dently up to 24V and down to -9V. With a few additional
low-cost components, the output voltages can be set at
up to 45V and down to -16V. Output ripple magnitude is
30mVp-p. The MAX685 uses a fixed-frequency, pulse-
width-modulated (PWM) control scheme at 220kHz or
400kHz to permit output noise filtering and to reduce
the size of external components. The frequency can
also be synchronized to an external clock signal
between 200kHz and 480kHz.
The MAX685 has a power-OK indicator output (POK)
that signals when both outputs are within regulation. A
logic-controlled shutdown completely turns off both out-
puts and reduces supply current to 0.1A. The user
can also set which output turns on first.
The preassembled MAX685 evaluation kit is available to
reduce design time.
Applications
Camcorders
LCDs
Digital Cameras
CCD Imaging Devices
Notebooks
Features
o Dual Output Using a Single Inductor
o Low-Noise Output, 30mVp-p Ripple
o Output Voltages up to 24V and down to -9V
(up to 45V and down to -16V with added
components)
o Internal Switches in a Small 24-Pin 4mm x 4mm
Thin QFN Package
o 220kHz/400kHz Fixed-Frequency PWM Operation
o Frequency Can Be Synchronized to External
Clock
o Power-OK Indicator
o Selectable Power-On Sequencing
o 0.1A Logic-Controlled Shutdown
MAX685
Dual-Output (Positive and Negative),
DC-DC Converter for CCD and LCD
________________________________________________________________ Maxim Integrated Products
1
MAX685
VP
VDD
ON
OFF
INPUT
2.7V TO 5.5V
LXN
FBP
LXP
FBN
REF
GND
NEGATIVE
OUTPUT
DOWN TO -9V,
10mA
POSITIVE
OUTPUT
UP TO 24V,
10mA
SHDN
SYNC
SEQ
POK
POS
NEG
OPTIONAL
POWER-OK
INDICATOR
24
23
22
21
20
19
7
8
9
10
11
12
13
14
15
16
17
18
6
5
4
3
2
1
MAX685
24-TQFN (4mm x 4mm)
TOP VIEW
N.C.
VP
POK
SEQ
SHDN
I.C.
LXP
LXN
I.C.
N.C.
PGND
FBP
REF
FBN
GND
N.C.
V
DD
SYNC
Typical Operating Circuit
19-1353; Rev 1; 6/03
PART
MAX685EEE
-40°C to +85°C
TEMP RANGE
PIN-PACKAGE
16 QSOP
EVALUATION
KIT MANUAL
FOLLOWS
DATA
SHEET
Pin Configuration
Ordering Information
MAX685ETG
-40°C to +85°C
24 TQFN
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX685EEE | 功能描述:直流/直流開關轉換器 DC/DC Converter for CCD & LCD RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX685EEE+ | 功能描述:直流/直流開關轉換器 DC/DC Converter for CCD & LCD RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX685EEE+T | 功能描述:直流/直流開關轉換器 DC/DC Converter for CCD & LCD RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX685EEE-T | 功能描述:直流/直流開關轉換器 DC/DC Converter for CCD & LCD RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX685ETG | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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