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MAX1677 Datasheet(PDF) 3 Page - Maxim Integrated Products

Part No. MAX1677
Description  Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter
Download  16 Pages
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1677 Datasheet(HTML) 3 Page - Maxim Integrated Products

 
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Compact, High-Efficiency, Dual-Output
Step-Up and LCD Bias DC-DC Converter
_______________________________________________________________________________________
3
CONDITIONS
N-channel
0.22
0.5
P-channel
0.4
1.0
LX Current Limit
ILX(PWM)
N-channel PWM mode
550
670
800
mA
UNITS
MIN
TYP
MAX
PARAMETER
ILX(PFM)
N-channel PFM mode
250
350
450
P-Channel Synchronous Rectifier
Turn-Off Current in PFM Mode
40
90
140
mA
Internal Oscillator
f
CLK/SEL = OUT
240
300
360
kHz
Oscillator Maximum Duty Cycle
D
80
85
90
%
External Clock Frequency
Range
200
400
kHz
LOGIC AND CONTROL
ON Input Threshold
VON(LOW)
VON(HIGH)
LCDON, LCDPOL, CLK/SEL
Input Threshold
VIL
VOUT > 2.5V
0.2VOUT
V
VIH
0.8VOUT
LBI Falling Threshold
VLBI(TH)
599
614
629
mV
LBI Hysteresis
1
%
LBO Output Low Voltage
VLBO(LO)
Sink current = 1mA
0.1
V
LBI Input Bias Current
ILBI(BIAS)
50
nA
LBO Leakage Current
ILBO(LEAK) VLBO = 5.5V
1
µA
LCDLX Voltage
28
V
LCDPOL connected to OUT or GND through
50k
150
225
300
mA
LCDLX Switch Resistance
RLCDLX
VOUT = 3.3V
1.0
1.4
LCDLX Leakage Current
VLCDLX = 28V
1
µA
LCDFB Set Point
Positive LCD, LCDPOL = OUT
1.225
1.25
1.275
V
Negative LCD, LCDPOL = GND
-15
0
15
mV
LCDFB Input Bias Current
50
nA
LCD Line Regulation
ILOAD = 5mA, VIN = 1.2V to 3.6V,
Figure 2
0.1
%/V
LCD Load Regulation
ILOAD = 0 to 5mA, VIN = 2.4V,
Figure 2
0.5
%
Maximum LCDLX On-Time
tON LCD
3.4
4.3
5.2
µs
1.1V < VOUT < 5.5V
0.8VOUT
0.2VOUT
V
ELECTRICAL CHARACTERISTICS (continued)
(VOUT = 3.3V, CREF = 0.1µF, POUT = OUT, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
LX On-Resistance
SYMBOL
RLX(ON)N
RLX(ON)P
LCDPOL = OUT or GND
300
350
450
LCDLX Switch Current Limit
Input Leakage Current
ON, LCDON, LCDPOL, CLK/SEL
1
µA
Minimum LCDLX Off-Time
Operating mode
0.8
1
1.2
µs
Start-up mode (positive or negative)
3.0
4.0
5.0
LCDFB Voltage for
Start-Up Mode
LCDPOL = OUT
0.75
V
LCDPOL = GND
0.5
LOGIC AND CONTROL INPUTS
LCD BIAS DC-DC


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