MAX685 Maxim, MAX685 Datasheet
MAX685
Manufacturer Part Number
MAX685
Description
Dual-Output Positive and Negative / DC-DC Converter for CCD and LCD
Manufacturer
Maxim
Datasheet
1.MAX685.pdf
(12 pages)
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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 the small
16-pin QSOP package (same size as an 8-pin SO) to
save space and reduce cost.
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 0.1µA. The user
can also set which output turns on first.
The preassembled MAX685 evaluation kit is available to
reduce design time.
19-1353; Rev 0; 4/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
Camcorders
Digital Cameras
Notebooks
TOP VIEW
I.C. = INTERNALLY CONNECTED
SHDN
SYNC
POK
SEQ
LXP
V
I.C.
VP
DD
________________________________________________________________ Maxim Integrated Products
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General Description
MAX685
QSOP
Dual-Output (Positive and Negative),
Pin Configuration
LCDs
CCD Imaging Devices
DC-DC Converter for CCD and LCD
Applications
16
15
14
13
12
11
10
9
LXN
I.C.
PGND
PGND
FBP
REF
FBN
GND
MAX685EEE
Dual Output Using a Single Inductor
Low-Noise Output, 30mVp-p Ripple
Output Voltages up to 24V and down to -9V
(up to 45V and down to -16V with added
components)
Internal Switches in a Small Package
220kHz/400kHz Fixed-Frequency PWM Operation
Frequency Can Be Synchronized to
External Clock
Power-OK Indicator
Selectable Power-On Sequencing
0.1µA Logic-Controlled Shutdown
POS
ON
OPTIONAL
POWER-OK
INDICATOR
PART
INPUT
2.7V TO 5.5V
OFF
NEG
Typical Operating Circuit
VP
V
SHDN
SYNC
SEQ
POK
DD
-40°C to +85°C
TEMP. RANGE
MAX685
Ordering Information
GND
LXN
FBN
FBP
LXP
REF
16 QSOP
PIN-PACKAGE
Features
POSITIVE
OUTPUT
UP TO 24V,
10mA
NEGATIVE
OUTPUT
DOWN TO -9V,
10mA
1
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