Max8727 tft-lcd step-up dc-dc converter, Electrical characteristics (continued), Electrical characteristics – Rainbow Electronics MAX8727 User Manual
Page 3
MAX8727
TFT-LCD Step-Up DC-DC Converter
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
SHDN
= 3V, FREQ = GND, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
CONTROL INPUTS
SHDN, FREQ Input Low Voltage
V
IN
= 2.6V to 5.5V
0.3
×
V
IN
V
SHDN, FREQ Input High Voltage
V
IN
= 2.6V to 5.5V
0.7
×
V
IN
V
SHDN, FREQ Input Hysteresis
V
IN
= 2.6V to 5.5V
0.1
×
V
IN
V
FREQ Pulldown Current
2.3
6.0
9.5
µA
SHDN Input Current
SHDN = GND
0.001
1
µA
ELECTRICAL CHARACTERISTICS
(V
IN
= V
SHDN
= 3V, FREQ = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OUT
< 18V
2.6
5.5
Input Voltage Range
18V < V
OUT
< 24V
4.0
5.5
V
Output Voltage Range
24
V
IN Undervoltage-Lockout
Threshold
V
IN
rising, typical hysteresis is 50mV
2.20
2.57
V
V
FB
= 1.3V, not switching
0.44
IN Quiescent Current
V
FB
= 1.0V, switching
5
mA
IN Shutdown Current
SHDN = GND
10
µA
ERROR AMPLIFIER
FB Regulation Voltage
Level to produce V
COMP
= 1.24V
1.215
1.260
V
FB Input Bias Current
V
FB
= 1.24V
250
nA
FB Line Regulation
Level to produce V
COMP
= 1.24V, V
IN
= 2.6V to 5.5V
0.15
%/V
Transconductance
100
300
µS
Shutdown FB Input Voltage
SHDN = GND
0.05
0.15
V
OSCILLATOR
FREQ = GND
490
770
Frequency
FREQ = IN
900
1600
kHz
Maximum Duty Cycle
86
94
%
n-CHANNEL MOSFET
Current Limit
V
FB
= 1V, 75% duty cycle
3.0
5.1
A
On-Resistance
250
m
Ω
Current-Sense Transresistance
0.11
0.31
V/A
SOFT-START
Reset Switch Resistance
100
Ω
Charge Current
V
SS
= 1.2V
2.5
7.5
µA