MAX1579 Maxim Integrated Products, MAX1579 Datasheet - Page 3

• Manufacturer Part Number: MAX1579
• Description: Complete Bias and White LED Power Supplies for Small TFT Displays
• Manufacturer: Maxim Integrated Products

ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V
Dual Mode is a trademark of Maxim Integrated Products, Inc.
NEG Output Voltage
N E G D i schar g e S w i tch Resi stance
LOGIC INPUT (ONBIAS)
Logic Input Low Voltage
Logic Input High Voltage
Input Current
LED BACKLIGHTING
Efficiency
OUT Voltage Range
Overvoltage-Lockout (OVLO)
Threshold
OUT Input Bias Current
ERROR AMPLIFIER
CTRL to CS Regulation
CS Input Bias Current
CTRL Input Resistance
CTRL Dual Mode™ Threshold
CTRL Shutdown Delay
CS to COMP Transconductance
CS Regulation Derating Function
Start Temperature
CS Regulation Derating Function
Slope
CS Maximum Brightness Clamp
Voltage
CS Maximum Brightness Voltage
at CTRL
OSCILLATOR
Operating Frequency
Minimum Duty Cycle
Maximum Duty Cycle
Complete Bias and White LED Power Supplies
PARAMETER
IN
_______________________________________________________________________________________
= 3V, CTRL = ONBIAS = IN, T
I
V
T
T
LOAD = 6 LEDs in series at 20mA
(Note 2)
V
V
V
V
5.5V
V
V
5mV hysteresis
(Note 3)
V
V
V
MAX1578, V
MAX1579, V
MAX1578
MAX1579
f
PWM mode
Pulse skipping
CTRL = IN, CS = GND
LOAD
BOOST
A
A
ONBIAS
OUT
OUT
OUT
CTRL
CS
CTRL
COMP
CTRL
CTRL
= +25°C
= +85°C
= V
rising, 2V hysteresis
= 32V, V
= V
= 0 to -100µA
= 1.5V, V
< 1.0V
= 3V, MAX1579 only
= 3V, T
= 1.0V
CTRL
= 0V
IN
, V
CTRL
CTRL
/ 5
CTRL
A
CTRL
A
IN
= +65°C, MAX1579 only
= -40°C to +85°C, typical values are at T
= 3V
= 3V, T
= 2.7V to
= 0
> 0.24V
CONDITIONS
A
= +25°C
T
T
T
T
MAX1578
MAX1579
A
A
A
A
for Small TFT Displays
= +25°C
= -40°C to +85°C
= +25°C
= +85°C
T
T
T
T
A
A
A
A
= +25°C
= +85°C
= +25°C
= +85°C
A
= +25°C, unless otherwise noted. Note 1)
(V
0.295
0.292
-10.2
V
MIN
250
250
100
310
322
1.6
0.8
6.5
32
10
32
92
D1
IN
)
-
0.300
0.300
1.635
TYP
0.01
0.01
0.01
0.03
1.70
+42
-9.8
500
500
185
170
327
340
1.5
0.1
8.2
1.0
84
34
20
60
12
95
-6
1
0
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0.305
0.308
MAX
0.72
10.5
-9.3
780
780
240
345
358
1.2
32
36
32
90
3
1
1
1
UNITS
mV/°C
MHz
mV
mV
ms
kΩ
µA
µA
µA
kΩ
µS
°C
%
%
%
V
V
V
V
V
V
V
3