MAX1800
Digital Camera Step-Up
Power Supply
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
OUT
= V
POUT
= 3.3V, PGND = GND, V
ONM
= 3.3V, V
ON1
= V
ON2
= V
ON3
= V
ONA
= 0, T
A
= -40°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
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.
OUT, POUT, ON_, DCON_, FB_, RDYM to GND.....-0.3V to +6.0V
PGND to GND ......................................................-0.3V to +0.3V
OUT to POUT_ ......................................................-0.3V to +0.3V
LX, DL_, AO to PGND .............................-0.3V to (POUT + 0.3V)
REF, OSC, AI, COMP_ to GND..................-0.3V to (OUT + 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
32-Pin TQFP (derate 11mW/°C above +70°C) ............880mW
Operating Temperature Range
MAX1800EHJ.................................................. -40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range. ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GENERAL
Input Voltage Range (Note 2) V
IN
0.7 5.5 V
Minimum Startup Voltage V
START
I
LOAD
< 1mA, T
A
= +25
o
C 0.9 1.1 V
Frequency in Startup Mode V
OUT
= 1.5V 40 150 300 kHz
SUPPLY CURRENT
Shutdown Supply Current V
ONM
= 0 0.002 5 µA
Main DC/DC Converter Supply
Current
V
FBM
= 1.2V, V
OSC
= 0 250 400 µA
Main + Auxiliary 1 Supply
Current
V
ON1
= 3.3V, V
FBM
= 1.2V, V
FB1
= 1.2V,
V
OSC
= 0
375 600 µA
Main + Auxiliary 2 Supply
Current
V
ON2
= 3.3V, V
FBM
= 1.2V, V
FB2
= 1.2V,
V
OSC
= 0
375 600 µA
Main + Auxiliary 3 Supply
Current
V
ON3
= 3.3V, V
FBM
= 1.2V, V
FB3
= 1.2V,
V
OSC
= 0
375 600 µA
Analog Gain Block Supply
Current
V
ONA
= 3.3V, V
FBM
= 1.2V, AI = REF,
AO open, V
OSC
= 0
375 600 µA
REFERENCE
Reference Output Voltage V
REF
I
REF
= 20µA 1.23 1.250 1.27 V
REF Load Regulation 10µA < I
REF
< 200µA 10 mV
REF Line Rejection 2.7V < V
OUT
< 5.5V 0.2 5 mV
OSCILLATOR
OSC Discharge Trip Level Rising edge 1.225 1.250 1.275 V
OSC Input Bias Current V
OSC
= 1.1V 0.01 100 nA
OSC Discharge Resistance V
OSC
= 1.5V, I
OSC
= 3mA 37 75 Ω
OSC Discharge Pulse Width 100 ns
(18 strony)
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