MAX1801
Digital Camera Step-Up Slave
DC-DC Controller
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
IN, DCON, REF, OSC, FB to GND.........................-0.3V to +6.0V
DL, COMP to GND.......................................-0.3V to (V
IN
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SOT23 (derate 6mW/°C above+70°C)................480mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range. ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= +3.3V, V
DCON
= +1.25V, V
REF
= +1.25V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
GENERAL
V
IN
Supply Voltage Operating Range 2.7 5.5 V
V
IN
Undervoltage Lockout Threshold V
IN
rising 2.2 2.35 2.5 V
REF Input Range 1.19 1.25 1.31 V
REF Undervoltage Lockout Threshold V
REF
rising 0.9 1.0 1.1 V
Shutdown Supply Current V
IN
= 5.5V, V
DCON
= 0, V
REF
= 0 0.01 1 µA
Sleep-Mode Supply Current V
IN
= 3.3V, V
DCON
= 0, V
REF
= 1.25V 5 10 µA
Quiescent Supply Current V
OSC
= 0, V
FB
= 0 124 300 µA
OSCILLATOR INPUT
OSC Input Leakage Current V
OSC
= 1.5V 0.04 1 µA
Oscillator Frequency Range 100 1000 kHz
OSC Clock Low Trip Level 0.20 0.25 0.30 V
1.00 1.05 1.10
OSC Clock High Trip Level
V
DCON
= 0.625V 0.575 0.625 0.675
V
Maximum Duty Cycle Adjustment Range
(Note 2)
f
OSC
= 100kHz 40 90 %
Maximum Duty Cycle (Note 2) V
DCON
= 0.625V, f
OSC
= 100kHz 50 %
Default Maximum Duty Cycle (Note 2) V
DCON
= 1.25V, f
OSC
= 100kHz 84 %
INPUTS/OUTPUTS
DCON Input Leakage Current V
DCON
= 5.5V 9 100 nA
DCON Input Sleep-Mode Threshold I
IN
≤ 10µA 0.35 0.4 0.45 V
V
DCON
= 0 0.5 1.1
V
DCON
= V
REF
3.3 10REF Input Current
V
DCON
= V
REF
, during soft-start 13 30
µA
ERROR AMPLIFIER
FB Regulation Voltage 1.238 1.250 1.263 V
FB to COMP Transconductance -5µA < I
COMP
< 5µA 70 100 160 µS
FB to COMP Maximum Voltage Gain 2000 V/V
FB Input Leakage Current V
FB
= 1.35V 30 100 nA
(32 Seiten)
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