MAX685EEE-T Maxim Integrated Products, MAX685EEE-T Datasheet

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MAX685EEE-T

Manufacturer Part Number
MAX685EEE-T
Description
DC/DC Switching Converters DC/DC Converter for CCD & LCD
Manufacturer
Maxim Integrated Products
Datasheet

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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 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 0.1µA. The user
can also set which output turns on first.
The preassembled MAX685 evaluation kit is available to
reduce design time.
19-1353; Rev 1; 6/03
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.
TOP VIEW
Camcorders
Digital Cameras
Notebooks
SHDN
N.C.
POK
SEQ
VP
VP
1
2
3
4
5
6
________________________________________________________________ Maxim Integrated Products
24-TQFN (4mm x 4mm)
General Description
MAX685
Dual-Output (Positive and Negative),
Pin Configuration
LCDs
CCD Imaging Devices
DC-DC Converter for CCD and LCD
Applications
18
17
16
15
14
13
N.C.
PGND
PGND
PGND
FBP
REF
o Dual Output Using a Single Inductor
o Low-Noise Output, 30mVp-p Ripple
o Output Voltages up to 24V and down to -9V
o Internal Switches in a Small 24-Pin 4mm x 4mm
o 220kHz/400kHz Fixed-Frequency PWM Operation
o Frequency Can Be Synchronized to External
o Power-OK Indicator
o Selectable Power-On Sequencing
o 0.1µA Logic-Controlled Shutdown
MAX685EEE
MAX685ETG
(up to 45V and down to -16V with added
components)
Thin QFN Package
Clock
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
-40°C to +85°C
TEMP RANGE
MAX685
Ordering Information
GND
LXN
FBN
FBP
LXP
REF
16 QSOP
24 TQFN
PIN-PACKAGE
Features
POSITIVE
OUTPUT
UP TO 24V,
10mA
NEGATIVE
OUTPUT
DOWN TO -9V,
10mA
1

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MAX685EEE-T Summary of contents

Page 1

... 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 0.1µA Logic-Controlled Shutdown PART MAX685EEE MAX685ETG Applications INPUT 2. N.C. 17 PGND OPTIONAL ...

Page 2

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD ABSOLUTE MAXIMUM RATINGS GND........................................................-0.3V to +6V DD PGND to GND .......................................................-0.3V to +0. VP...............................................................-0.3V to +0.3V DD LXN, POK to GND ..................................................-0.3V to +30V ...

Page 3

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD ELECTRICAL CHARACTERISTICS (continued 5V 0°C to +85°C unless otherwise noted. Typical values are PARAMETER SYNC INPUT Sync Frequency Range (external) ...

Page 4

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD (Circuit of Figure 15V, V OUT+ OUT- EFFICIENCY vs. LOAD CURRENT (POSITIVE OUTPUT LOADED 5. 3. ...

Page 5

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD (Circuit of Figure 15V, V OUT+ OUT- V LOAD-TRANSIENT RESPONSE OUT+ 11mA I OUT+ 1mA V OUT+ 2ms/div START-UP (SEQ = HIGH) 5V/div 5V/div 2ms/div START-UP, SEQ ...

Page 6

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD PIN PIN NAME 16-QSOP 24-TQFN 1 22, 23 LXP P-Channel Switching Inductor Node. LXP turns off when the part enters shutdown 19, 24 I.C. Internally Connected. Do not ...

Page 7

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD TO V OUT- FBN TO V OUT+ FBP REF Figure 1. Functional Diagram LXN LXP Figure 2. LXN and LXP Waveforms (see also Figure 5) The current into the LXN ...

Page 8

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD Applications Information Figure 3 shows the standard application circuit for the MAX685. The values shown in Table 1 will work well for output currents up to 10mA. However, this circuit ...

Page 9

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD Table 1. Component Values for the Typical Operating Circuit MANUFACTURER REF DESCRIPTION PART NUMBER 10µF, 10V Sprague 595D106X0010A2T or C1 tantalum cap AVX TAJA106K010R 0.22µF ceramic C2 Any manufacturer capacitor ...

Page 10

Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages. 10 ______________________________________________________________________________________ Package Information PACKAGE OUTLINE 12,16,20,24L ...

Page 11

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2003 Maxim Integrated Products ...

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