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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1621 Datasheet

Digitally Adjustable LCD Bias Supplies

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MAX1621 pdf
19-1214; Rev 1; 1/98
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
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.
Features
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
PART
MAX1620EEE
MAX1621EEE
Ordering Information
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
Pin Configuration
TOP VIEW
DN (SDA) 1
UP (SCL) 2
BATT 3
SHDN (SUS) 4
POK 5
REF 6
POL 7
LCDON 8
MAX1620
MAX1621
( ) ARE FOR MAX1621 ONLY.
QSOP
16 DHI
15 DLO
14 LX
13 PGND
12 AGND
11 VDD
10 DOUT
9 FB
Typical Operating Circuit
2V TO
12V
3V TO
5.5V
ON/OFF
DOWN
UP
BATT
VDD LX
POL DHI
SHDN
DN
UP
DLO
PGND
MAX1620
REF DOUT
AGND
FB
POK LCDON
12.5V
TO
23.5V OUT
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1621 Datasheet

Digitally Adjustable LCD Bias Supplies

No Preview Available !

MAX1621 pdf
Digitally Adjustable LCD Bias Supplies
ABSOLUTE MAXIMUM RATINGS
VDD to AGND ..............................................................-0.3V to 6V
PGND to AGND ..................................................................±0.3V
BATT, LX, LCDON to AGND ....................................-0.3V to 30V
DHI, DLO to PGND.....................................-0.3V to (VDD + 0.3V)
DOUT, FB, POL, POK, REF to AGND.........-0.3V to (VDD + 0.3V)
UP, DN, SHDN to AGND.............................................-0.3V to 6V
SCL, SDA, SUS to AGND............................................-0.3V to 6V
IDHI ......................................................................................60mA
IDLO....................................................................................-30mA
ILCDON ...............................................................................-10mA
Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.3mW/°C above +70°C) ......................667mW
Operating Temperature Range
MAX1620EEE/MAX1621EEE ............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = 3.3V, VBATT = 10V, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
SWITCHING REGULATOR
VDD Operating Range
VDD Supply Current
Positive Output Voltage
Operating mode, output in regulation, VDD = 5.5V
Shutdown mode, V SHDN = VDD, VDD = 5.5V
Negative Output Voltage
Undervoltage Lockout Threshold (Note 1)
BATT Input Current
BATT = 12V, operating mode
BATT = 12V, shutdown mode
LX Input Current
LX = 12V, operating mode
LX = 12V, shutdown mode
BATT Operating Range (Note 2)
Microsecond-Volt Time Constant (k-factor)
On-Resistance (DLO, DHI)
DHI Output Current (Note 3)
DLO Output Current (Note 3)
FB Regulation Voltage
FB Input Current (Note 3)
LCDON Low, Sinking Current
LCDON High, Leakage Current
POK Threshold Voltage
POK Hysteresis
1.8V BATT 20V, TA = +25°C
4V BATT 12V, TA = 0°C to +85°C
VDD = 4.5V
VDD = 3.0V
VDD = 5V
VDD = 5V
POL = VDD, 3.0V VDD 5.5V
POL = AGND, 3.0V VDD 5.5V
FB = REF + 100mV
FB = -50mV
V LCDON = 0.4V, POK = 1.017V
V LCDON = 28V, POK = 0.967V
Voltage on POK rising
REFERENCE AND DAC OUTPUT
REF Voltage
REF Load Regulation
No load
0µA IREF 25mA
MIN
3.0
1.5
1.8
16.5
1.46
-8
-20
-10
-2
0.967
1.47
TYP
150
9
13
13
20
7
14
50
-25
1.5
0
-6
0.992
12
1.5
3
MAX UNITS
5.5
250
20
27
-27
2.8
20
1
20
1
20
23.5
1.53
8
10
85
1
1.017
V
µA
V
V
V
µA
µA
V
µs-V
mA
mA
V
mV
nA
mA
µA
V
mV
1.53
10
V
mV
2 _______________________________________________________________________________________


Part Number MAX1621
Description Digitally Adjustable LCD Bias Supplies
Maker Maxim
Total Page 20 Pages
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