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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1611 Datasheet

Digitally Controlled CCFL Backlight Power Supplies

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19-1128; Rev 0; 9/96
EVAALVUAAILTAIOBNLEKIT
Digitally Controlled CCFL Backlight
Power Supplies
_______________General Description
The MAX1610/MAX1611 are fully integrated, high-
efficiency drivers for cold-cathode fluorescent lamps
(CCFLs). They operate from a 4.5V to 26V power
source. An on-board, high-switching-frequency power
MOSFET reduces external component count and mag-
netics size. The MAX1610/MAX1611 protect against
open or shorted lamps. The CCFL can be driven from
an isolated transformer secondary winding to improve
efficiency and avoid flicker at dim tube settings.
Brightness is adjusted by scaling the lamp current, or
by operating with a fixed lamp current and chopping
the CCFL on and off at a rate faster than the eye can
detect.
The MAX1610’s digital inputs increment, decrement, or
clear an internal, 5-bit up/down counter, which sets
CCFL brightness. The MAX1611 uses a System
Management Bus (SMBus) 2-wire serial interface to
directly set CCFL brightness. Both devices include
micropower shutdown and a linear regulator that elimi-
nates the need for a separate logic supply. The digital
interface remains active in shutdown, preserving the
brightness setting.
____________________________Features
® Direct Digital Control of CCFL Brightness
® Low Supply Current: 3mA Max Operating
20µA Max Shutdown
® Low-Voltage Operation, Down to 4.5V
® WInternal 26V, 0.7 Power Switch
® Protection Against Open or Shorted Lamps
® Supports Isolated Transformer Secondary
Winding
® SMBus Serial Interface (MAX1611)
® No Flicker at Low Brightness (internal 280Hz
current chopping)
® High Power-to-Light Efficiency
® Selectable 290kHz/145kHz Switching Frequency
® Oscillator SYNC Input
® 16-Pin Narrow SO Package
________________________Applications
Notebook/Laptop Computers
Point-of-Sale Terminals
Portable Medical Equipment
Instrument Displays
______________Ordering Information
PART
MAX1610CSE
MAX1611CSE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
16 Narrow SO
16 Narrow SO
__________________________________________________________Pin Configurations
TOP VIEW
UP 1
DN 2
SHDN 3
SYNC 4
SS 5
CC 6
CSAV 7
MINDAC 8
MAX1610
SO
16 BATT
15 LX
14 BST
13 GND
12 VL
11 CS
10 OTP
9 REF
SDA 1
SCL 2
SMBSUS 3
SYNC 4
SS 5
CC 6
CSAV 7
MINDAC 8
MAX1611
SO
16 BATT
15 LX
14 BST
13 GND
12 VL
11 CS
10 OTP
9 REF
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1611 Datasheet

Digitally Controlled CCFL Backlight Power Supplies

No Preview Available !

Digitally Controlled CCFL Backlight
Power Supplies
ABSOLUTE MAXIMUM RATINGS
BATT to GND ............................................................-0.3V to 28V
BST to GND ..............................................................-0.3V to 30V
BST to LX ....................................................................-0.3V to 6V
LX to GND ................................................-0.6V to (BATT + 0.3V)
VL to GND...................................................................-0.3V to 6V
CS, CSAV, CC, SYNC, REF, MINDAC,
SS, OTP to GND............................................-0.3V to (VL + 0.3V)
SHDN, UP, DN to GND ...............................................-0.3V to 6V
SMBSUS, SDA, SCL to GND ......................................-0.3V to 6V
BATT, LX Current .....................................................................1A
SDA Current ........................................................................50mA
VL Current ...........................................................................50mA
Continuous Power Dissipation (TA = +70°C)
SO (derate 8.70mW/°C above +70°C) .........................696mW
Operating Temperature Range
MAX1610CSE/MAX1611CSE ..............................0°C to +70°C
Storage Temperature Range .............................-65°C to +160°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
(TA = 0°C to +70°C, BATT = 8.2V, MINDAC = 0V, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP
SUPPLY AND REFERENCE
BATT Input Voltage Range
4.75
BATT Quiescent Supply Current,
Operate Mode
BATT = 25V
1.5
BATT Quiescent Supply Current,
Shutdown Mode
VL Output Voltage, Operate Mode
VL Output Voltage, Shutdown Mode
REF Output Voltage
REF Load Regulation
SWITCHING REGULATOR
BATT-to-LX Switch On-Resistance
4.75V < BATT < 26V
No load
ISOURCE = 100µA
BST - LX = 4.1V
LX Switch Off-Leakage Current
Oscillator Frequency
SYNC = REF
SYNC = GND
Oscillator SYNC Pin Synchronization Range
SYNC High Pulse Width
SYNC Low Pulse Width
SYNC Input Current
SYNC = GND or VL
SYNC Input Low Voltage
SYNC Input High Voltage
Power-Switch Maximum Duty Cycle
SYNC = REF
SS Source Current
SS = GND
SS Sink Current
SS = 0.5V
10
4.25 4.5
3.0 3.6
1.92 2.0
6
0.7
250 290
125 145
240
200
200
-1
4.0
89 91
2.5 4.0
2
MAX UNITS
26 V
3 mA
20 µA
4.75 V
4.75 V
2.08 V
20 mV
1.0
10 µA
330
kHz
165
350 kHz
ns
ns
1 µA
0.5 V
V
%
5.5 µA
mA
2 _______________________________________________________________________________________


Part Number MAX1611
Description Digitally Controlled CCFL Backlight Power Supplies
Maker Maxim
Total Page 20 Pages
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