Compact, High-Efficiency, Dual-Output
Step-Up and LCD Bias DC-DC Converter
MAX1677
ABSOLUTE MAXIMUM RATINGS
OUT, LCDON, ON, POUT, LBI,
LBO,
LX to GND .............................................................-0.3V to +6V
CLK/SEL, LCDPOL, REF, LCDFB,
FB to GND .............................................-0.3V to (V
OUT
+ 0.3V)
LCDLX to GND .......................................................-0.3V to +30V
PGND, LCDGND to GND ......................................-0.3V to +0.3V
POUT to OUT.........................................................-0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
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
OUT
= 3.3V, C
REF
= 0.1µF, POUT = OUT,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
GENERAL
Input Voltage Range
Minimum Start-Up Voltage
Reference Voltage
Reference Load Regulation
Reference Line Rejection
Supply Current
Main DC On, LCD Off
Supply Current All On,
Main DC-DC in PFM Mode
Supply Current All On,
Main DC-DC in PWM Mode
Supply Current in Shutdown
MAIN BOOST DC-DC
Output Voltage
FB Regulation Voltage
FB Input Current
Output Voltage Adjustment
Range
Start-Up to Normal Mode
Transition Voltage (Note 4)
Line Regulation
Load Regulation
Frequency in Start-Up Mode
LX Leakage Current
f
STARTUP
I
LX(LEAK)
V
LOCKOUT
I
OUT
= 150mA, V
IN
= 2V to 3V
CLK/SEL = OUT, V
IN
= 2.4V,
I
L OAD
= 10mA to 200mA
V
OUT
= 1.5V
40
0.2
V
OUT
V
FB(REG)
I
FB
FB = GND, 0
≤
I
LX
≤
350mA,
CLK/SEL = OUT (Note 3)
Adjustable mode, CLK/SEL = OUT (Note 3)
V
FB
= 1.3V
2.5
2.1
0.6
1
300
5
3.20
1.225
3.30
1.25
0.02
3.43
1.275
50
5.5
2.4
V
V
nA
V
V
%
%
kHz
µA
I
LCDOFF
I
PFM
I
PWM
V
IN
V
STARTUP
V
REF
(Note 1)
T
A
= +25°C, I
LOAD
< 1mA
I
REF
= 0
I
REF
= 0 to 50µA (Note 2)
V
OUT
= 2.5V to 5.5V
No load, current into OUT
No load, current into OUT
No load, current into OUT
1.23
0.7
0.9
1.25
2
0.2
20
35
115
0.3
5.5
1.1
1.27
15
5
40
60
300
5
V
V
V
mV
mV
µA
µA
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
