MAX8740 Maxim Integrated Products, MAX8740 Datasheet - Page 2

• Manufacturer Part Number: MAX8740
• Description: TFT-LCD Step-Up DC-DC Converter
• Manufacturer: Maxim Integrated Products

ABSOLUTE MAXIMUM RATINGS
LX to GND ..............................................................-0.3V to +30V
IN, SHDN, FREQ, FB to GND ...................................-0.3V to +6V
COMP, SS to GND .......................................-0.3V to (V
LX Switch Maximum Continuous RMS Current .....................2.4A
Continuous Power Dissipation (T
TFT-LCD Step-Up DC-DC Converter
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
(V
2
Input Voltage Range
Output Voltage Range
IN Undervoltage-Lockout
Threshold
IN Quiescent Current
IN Shutdown Current
ERROR AMPLIFIER
FB Regulation Voltage
FB Input Bias Current
FB Line Regulation
Transconductance
Voltage Gain
OSCILLATOR
Frequency
Maximum Duty Cycle
n-CHANNEL MOSFET
Current Limit
On-Resistance
Leakage Current
Current-Sense Transresistance
SOFT-START
Reset Switch Resistance
Charge Current
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IN
10-Pin TDFN (derate 24.1mW/°C above +70°C) .......1481.5mW
_______________________________________________________________________________________
= V
SHDN
PARAMETER
= 3V, T
A
= 0°C to +85°C. Typical values are at T
A
= +70°C)
V
18V < V
V
below this level
V
V
SHDN = GND
Level to produce V
V
Level to produce V
FREQ = GND
FREQ = IN
V
V
V
V
V
OUT
IN
FB
FB
FB
FB
IN
IN
LX
SS
rising, typical hysteresis is 50mV; LX remains off
= 3V (typ value at T
= 5V (typ value at T
= 28V
= 1.3V, not switching
= 1.0V, switching, FREQ = GND
= 1.24V
= 1V, 71% duty cycle
= 1.2V
< 18V
OUT
< 24V
IN
COMP
COMP
+ 0.3V)
CONDITIONS
A
A
= 1.24V
= 1.24V, V
= +25°C)
= +25°C)
A
= +25°C, unless otherwise noted.)
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
IN
= 2.6V to 5.5V
1000
MIN
2.20
1.22
0.09
100
540
2.6
4.0
3.9
2.5
50
88
0.095
2400
1220
TYP
2.38
0.22
1.24
0.05
0.11
0.15
125
200
640
0.1
4.6
4.5
91
30
2
MAX
1500
2.57
0.44
10.0
1.26
0.15
0.17
0.15
0.25
250
315
740
100
5.5
5.5
5.3
7.5
28
94
55
5
UNITS
%/V
kHz
V/A
mA
V/V
µA
nA
µS
µA
µA
%
Ω
Ω
V
V
V
V
A