MAX686 Maxim, MAX686 Datasheet
MAX686
Manufacturer Part Number
MAX686
Description
DAC-Controlled Boost/Inverter LCD Bias Supply with Internal Switch
Manufacturer
Maxim
Datasheet
1.MAX686.pdf
(16 pages)
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The MAX686 DAC-controlled boost/inverter IC converts
a positive input voltage to a positive or negative LCD
bias voltage up to +27.5V or -27.5V. The device features
an internal N-channel MOSFET switch, programmable
current limiting, and an internal 6-bit digital-to-
analog converter (DAC) for digital adjustment of the
output voltage. It comes in a small 16-pin QSOP pack-
age (same size as an 8-pin SO).
The MAX686 uses a current-limited, pulse-frequency-
modulation (PFM) control scheme to provide high effi-
ciency over a wide range of load conditions. Its high
switching frequency (up to 300kHz) allows the use of
small external components.
An LCDON output allows the LCD bias voltage to be
automatically disabled when the display logic voltage is
removed, protecting the display. The MAX686 has a
+2.7V to +5.5V input voltage range for the IC, and a
+0.8V to +27.5V input voltage range for the inductor.
Typical quiescent supply current is 65µA. Shutdown
current is 1.5µA.
The MAX686 offers high-level integration to save space,
reduce power consumption, and increase battery life,
making it an excellent choice for battery-powered
portable equipment. The MAX629 is similar to the
MAX686, except that it does not contain a built-in DAC.
Both devices have evaluation kits to facilitate designs.
19-1327; Rev 1; 2/98
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.
TOP VIEW
Positive or Negative LCD Bias
Personal Digital Assistants
Notebook Computers
Portable Data-Collection Terminals
Palmtop Computers
Varactor Tuning Diode Bias
DACOUT
PGND
SHDN
ISET
POL
V
DN
UP
DD
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
6
7
8
General Description
LCD Bias Supply with Internal Switch
MAX686
QSOP
Pin Configuration
Applications
16
15
14
13
12
11
10
9
LX
N.C.
LCDON
GND
V
POK
FB
REF
CC
DAC-Controlled Boost/Inverter
*
Functional Diagram appears at end of data sheet.
____________________________Features
Dice are specified at T
DAC CONTROL
V
V
MAX686C/D
MAX686EEE
0.1 F
CC
IN
Internal 500mA, 28V N-Channel Switch
(no external FET required)
Adjustable Output Voltage to +27.5V or -27.5V
6-Bit DAC-Controlled Output Voltage
Up to 90% Efficiency
Small 16-Pin QSOP Package
Power-OK Indicator
65µA Quiescent Current
1.5µA Shutdown Current
Up to 300kHz Switching Frequency
= 0.8V TO 27.5V
= 2.7V TO 5.5V
(Same size as 8-pin SO)
PART
ON/OFF
V
V
UP
DN
SHDN
POL
Typical Operating Circuit
CC
DD
GND
TEMP. RANGE
-40°C to +85°C
MAX686
A
22 H
0°C to +70°C
= +25°C, DC parameters only.
Ordering Information
DACOUT
LCDON
PGND
ISET
POK
REF
LX
FB
MBR0530L
R3
Dice*
16 QSOP
PIN-PACKAGE
0.1 F
R1
R2
V
OUT
1
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