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Rainbow-electronics MAX8758 Manual de usuario Pagina 4

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MAX8758
Step-Up Regulator with Switch Control and
Operational Amplifier for TFT LCD
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
SHDN
= +3V, OUT = +10V, FREQ = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
I
OUTB
= 100µA
V
SUPB
-
15
Output Voltage Swing High
I
OUTB
= 5mA
V
SUPB
-
150
mV
I
OUTB
= -100µA 15
Output Voltage Swing Low
I
OUTB
= -5mA 150
mV
Slew Rate 7.5 V/µs
-3dB Bandwidth 12
MHz
Gain-Bandwidth Product 8
MHz
OUTB shorted to V
SUPB
/2, sourcing 75
150
Short-Circuit Current
OUTB shorted to V
SUPB
/2, sinking 75
150
mA
CONTROL INPUTS
FREQ Input Low Voltage V
IN
= 1.8V to 5.5V 0.6 V
V
IN
= 1.8V to 2.4V 1.4
FREQ Input High Voltage
V
IN
= 2.4V to 5.5V 2.0
V
FREQ Pulldown Current V
FREQ
= 1.0V 3.5 5.0 6.0 µA
SHDN Input Low Voltage V
IN
= 1.8V to 5.5V 0.6 V
V
IN
= 1.8V to 2.4V 1.4
V
IN
= 2.4V to 3.6V 2.0
SHDN Input High Voltage
V
IN
= 3.6V to 5.5V 2.9
V
SHDN Input Current
0.001
1.0 µA
ELECTRICAL CHARACTERISTICS
(V
IN
= V
SHDN
= +3V, OUT = +10V, FREQ = GND, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
IN Input Voltage Range 1.8 5.5 V
IN Quiescent Current V
IN
= 3V, V
FB
= 1.5V 30 µA
IN Undervoltage Lockout
IN rising, 200mV hysteresis, LX remains off below
this level
1.75
V
LDO Output Voltage
6V ≤ V
OUT
≤ 13V, I
LDO
= 12.5mA, V
FB
= 1.5V
(Note 1)
4.8 5.2 V
LDO Undervoltage Lockout Voltage LDO rising, 200mV hysteresis 2.4 3.0 V
OUT Supply Voltage Range (Note 1) 4.5
13.0
V
V
FB
= 1.5V, no load 2.0
OUT Supply Current
V
FB
= 1.1V, no load
10.0
mA
STEP-UP REGULATOR
FREQ = GND
512 768
Operating Frequency
FREQ = IN
990 1380
kHz
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