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MAX1677 Datasheet(PDF) 4 Page - Maxim Integrated Products

Part No. MAX1677
Description  Compact, High-Efficiency, Dual-Output Step-Up and LCD Bias DC-DC Converter
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX1677 Datasheet(HTML) 4 Page - Maxim Integrated Products

 
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Compact, High-Efficiency, Dual-Output
Step-Up and LCD Bias DC-DC Converter
4
_______________________________________________________________________________________
Note 1: The MAX1677 operates in bootstrap mode (operates from the output voltage). Once started, it will operate down to 0.7V
input. If VIN exceeds the set VOUT, VOUT will follow one diode drop below VIN.
Note 2: CREF = 0.22µF for applications where IREF > 10µA.
Note 3: In low-power mode (CLK/SEL = GND), the output voltage regulates 1% higher than in low-noise mode (CLK/SEL = OUT or
synchronized).
Note 4: The device is in a start-up mode when VOUT is below this value.
Note 5: Specifications to -40°C are guaranteed by design and not production tested.
LBO Output Low Voltage
V LBO(LO)
Sink current = 1mA
LCDPOL = OUT or GND
300
450
0.1
V
µA
Supply Current
Main DC On, LCD Off
Main
Supply Current All On,
Main DC-DC in PFM Mode
IPFM
No load, current into OUT
60
µA
V
FB Regulation Voltage
µA
LX Leakage Current
Start-Up to Normal Mode Transition
Voltage (Note 4)
CONDITIONS
VLOCKOUT
2.1
2.4
V
ILX(LEAK)
5
Output Voltage
VOUT
FB = GND, 0
≤ ILX ≤ 350mA,
CLK/SEL = OUT (Note 3)
3.17
3.4
V
VFB(REG)
Adjustable mode, CLK/SEL = OUT (Note 3)
1.22
1.28
µA
Supply Current All On,
Main DC-DC in PWM Mode
Supply Current in Shutdown
5
µA
IPWM
No load, current into OUT
300
General
ILCDOFF
No load, current into OUT
40
LX Current Limit
ILX(PWM)
N-channel PWM mode
550
900
mA
UNITS
MIN
MAX
SYMBOL
PARAMETER
ILX(PFM)
N-channel PFM mode
250
500
Internal Oscillator
f
CLK/SEL = OUT
240
360
kHz
External Clock Frequency Range
200
400
kHz
LOGIC
ON Input Threshold
VON(LOW)
1.1V < VOUT < 5.5V
0.2VOUT
V
VON(HIGH)
0.8VOUT
LCDON, LCDPOL, CLK/SEL
Input Threshold
VIL
0.2VOUT
V
VIH
0.8VOUT
LBI Falling Threshold
VLBI(TH)
599
629
mV
LCD BIAS DC-DC
LCDLX Switch Current Limit
LCDPOL connected to OUT or GND
through 50k
150
300
mA
ELECTRICAL CHARACTERISTICS
(VOUT = 3.3V, CREF = 0.1µF, POUT = OUT, TA = -40°C to +85°C, unless otherwise noted. ) (Note 5)
LCDFB Set Point
Positive LCD, LCDPOL = OUT
1.22
1.28
V
-20
+20
Negative LCD, LCDPOL = GND
GENERAL
MAIN BOOST DC-DC
LOGIC AND CONTROL INPUTS
LCD BIAS DC-DC
mV


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