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MAX1620EEE

Description
Switching Voltage Regulators Digitally Adjustable LCD Bias Supplies
CategoryPower/power management    The power supply circuit   
File Size252KB,20 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX1620EEE Overview

Switching Voltage Regulators Digitally Adjustable LCD Bias Supplies

MAX1620EEE Parametric

Parameter NameAttribute value
Is it lead-free?Contains lead
Is it Rohs certified?incompatible
MakerMaxim
Parts packaging codeSOIC
package instruction0.150 INCH, 0.025 INCH PITCH, QSOP-16
Contacts16
Reach Compliance Codenot_compliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING CONTROLLER
control modeVOLTAGE-MODE
Maximum input voltage5.5 V
Minimum input voltage3 V
Nominal input voltage3.3 V
JESD-30 codeR-PDSO-G16
JESD-609 codee0
length4.89 mm
Humidity sensitivity level1
Number of functions1
Number of terminals16
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Maximum output current0.00004 A
Package body materialPLASTIC/EPOXY
encapsulated codeSSOP
Encapsulate equivalent codeSSOP16,.25
Package shapeRECTANGULAR
Package formSMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)245
Certification statusNot Qualified
Maximum seat height1.75 mm
surface mountYES
Switch configurationSINGLE
Maximum switching frequency200 kHz
technologyCMOS
Temperature levelINDUSTRIAL
Terminal surfaceTin/Lead (Sn85Pb15)
Terminal formGULL WING
Terminal pitch0.635 mm
Terminal locationDUAL
Maximum time at peak reflow temperatureNOT SPECIFIED
width3.9 mm
19-1214; Rev 1; 1/98
UAL
IT MAN
TION K
A
ET
EVALU
TA SHE
WS DA
FOLLO
Digitally Adjustable LCD Bias Supplies
General Description
The MAX1620/MAX1621 convert a 1.8V to 20V battery
voltage to a positive or negative LCD backplane bias
voltage. Backplane bias voltage can be automatically
disabled when the display logic voltage is removed,
protecting the display. These devices use very little PC
board area, come in ultra-small QSOP packages, and
require only small, low-profile external components.
Output voltage can be set to a desired positive or nega-
tive voltage range with external resistors, and adjusted
over that range with the on-board digital-to-analog con-
verter (DAC) or with a potentiometer. The MAX1620/
MAX1621 include a 5-bit DAC, allowing digital software
control of the bias voltage. The MAX1620 uses up/down
digital signaling to adjust the DAC, and the MAX1621
uses the System Management Bus (SMBus™) 2-wire
serial interface.
These devices use a low-cost, external, N-channel MOSFET
power switch or NPN transistor, and can be configured
for positive or negative output voltages. Operating cur-
rent is a low 150µA, typically provided from a display’s
logic supply of 3.0V to 5.5V. The MAX1620/MAX1621 are
available in a 16-pin QSOP package.
o
1.8V to 20V Battery Input Voltage
o
Automatic Disable when Display Logic
is Shut Down
o
Extremely Small QSOP Package
o
32-Level Internal DAC
o
SMBus Serial Interface (MAX1621)
o
Positive or Negative Output Voltage
Features
MAX1620/MAX1621
Ordering Information
PART
MAX1620EEE
MAX1621EEE
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 QSOP
Applications
Notebook Computers
Palmtop Computers
Personal Digital Assistants
Portable Data-Collection Terminals
Typical Operating Circuit
2V TO
12V
Pin Configuration
TOP VIEW
DN (SDA) 1
UP (SCL) 2
BATT 3
SHDN (SUS) 4
POK 5
REF 6
POL 7
LCDON 8
16 DHI
15 DLO
14 LX
ON
/
OFF
DOWN
UP
3V TO
5.5V
V
DD
POL
BATT
LX
DHI
DLO
PGND
12.5V
TO
23.5V OUT
SHDN
DN
UP
MAX1620
MAX1621
13 PGND
12 AGND
11 V
DD
10 DOUT
9
FB
MAX1620
REF
AGND
POK
DOUT
FB
LCDON
( ) ARE FOR MAX1621 ONLY.
QSOP
SMBus is a trademark of Intel Corp.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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