Rainbow Electronics MAX1611 - Manual

16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
BATT
LX
BST
GND
VL
CS
OTP
REF
UP
DN
SHDN
SYNC
SS
CC
CSAV
MINDAC
TOP VIEW
MAX1610
SO
MAX1610/MAX1611
Digitally Controlled CCFL Backlight
Power Supplies
________________________________________________________________ Maxim Integrated Products 1
19-1128; Rev 0; 9/96
EVALUATION KIT
AVAILABLE
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________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.
________________________Applications
Notebook/Laptop Computers
Point-of-Sale Terminals
Portable Medical Equipment
Instrument Displays
____________________________Features
® Direct Digital Control of CCFL Brightness
® Low Supply Current: 3mA Max Operating
20µA Max Shutdown
® Low-Voltage Operation, Down to 4.5V
® Internal 26V, 0.7 W 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
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
BATT
LX
BST
GND
VL
CS
OTP
REF
SDA
SCL
SMBSUS
SYNC
SS
CC
CSAV
MINDAC
MAX1611
SO
__________________________________________________________Pin Configurations
PART
MAX1610 CSE
MAX1611 CSE 0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
16 Narrow SO
16 Narrow SO
______________Ordering Information