Datasheet

IN, SHDN, to GND..................................................-0.3V to +28V
FB_ to GND............................................................-0.3V to +28V
V
CC
, BRT, ENA, OSC, OV to GND...........................-0.3V to +6V
ISET, CCV, CS, FSET, CPLL, EXT to GND .-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
TQFN (derate 16.9mW/°C above +70°C) ...................1349mW
Operating Temperature Range.............................-40°C to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range..............................-60°C to +150°C
Lead Temperature (soldering, 10s)...................................+300°C
(Circuit of Figure 1. V
IN
= 12V, V
SHDN
= V
IN
, CCV = 0.1μF, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
IN Input Voltage Range
V
IN
= V
CC
4.5 5.5
V
V
CC
= bypassed to GND through 1µF capacitor 5.5 26.0
IN Quiescent Current
V
SHDN
= high,
BRT = GND
V
IN
= 26V 1 2
mA
V
IN
= V
CC
= 5V 1 2
SHDN = GND 10 µA
V
CC
Output voltage V
SHDN
= 5V, 6V < V
IN
< 26V, 0 < I
VCC
< 10mA 4.7 5.0 5.3 V
V
CC
Short-Circuit Current 15 56 130 mA
V
CC
UVLO Threshold Rising edge, hysteresis = 20mV 4.00 4.25 4.45 V
STEP-UP CONVERTER
EXT High Level 10mA from EXT to GND
V
CC
-
0.1
V
CC
V
EXT Low Level -10mA from EXT to V
CC
0 0.1 V
EXT On-Resistance EXT high or low 2 5 Ω
EXT Sink/Source Current EXT forced to 2V 1 A
OSC High-Level Threshold
V
CC
-
0.4
V
OSC Midlevel Threshold 1.5
V
CC
-
2.0
V
OSC Low-Level Threshold 0.4 V
Operating Frequency
V
OSC
= V
CC
0.9 1.0 1.1 MHz
V
OSC
= open 675 750 825
kHz
V
OSC
= GND 450 500 550
Minimum Duty Cycle
PWM mode 10
%
Pulse skipping, no load 0
Maximum Duty Cycle 94 95 %
CS Trip Voltage Duty cycle = 75% 85 100 115 mV
CONTROL INPUT
SHDN Logic-Input High Level 2.1 V
SHDN Logic-Input Low Level 0.8 V
BRT, ENA Logic-Input High Level 2.1 V
BRT, ENA Logic-Input Low Level 0.8 V
MAX8790A Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
www.maximintegrated.com
Maxim Integrated │ 2
Absolute Maximum Ratings
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