Rainbow Electronics MAX1801 - Manual (Page 4)

MAX1801
Digital Camera Step-Up Slave
DC-DC Controller
4 _______________________________________________________________________________________
PARAMETER CONDITIONS MIN TYP MAX UNITS
ERROR AMPLIFIER
FB Regulation Voltage 1.238 1.263 V
FB to COMP Transconductance -5 µA < I
COMP < 5 µA 70 160 µS
FB Input Leakage Current V FB = 1.35V 100 nA
DRIVER
DL Driver Resistance 5 Ω
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V IN = +3.3V, V DCON = +1.25V, V REF = +1.25V, T A = -40°C to +85°C, unless otherwise noted.) (Note 1)
Typical Operating Characteristics
(Circuit of Figure 1, T A = +25°C, unless otherwise noted.)
90
0
1 1000 100 10
EFFICIENCY vs. LOAD CURRENT
30
10
70
50
100
40
20
80
60
MAX1801 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
V BATT = +1.5V
V
OUT
= +12V
V OUT = +7V
V OUT = +18V
90
0
1 1000 100 10
EFFICIENCY vs. LOAD CURRENT
30
10
70
50
100
40
20
80
60
MAX1801 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
V BATT = +2.4V
V OUT = +12V
V OUT = +7V
V
OUT
= +18V
90
0
1 1000 100 10
EFFICIENCY vs. LOAD CURRENT
30
10
70
50
100
40
20
80
60
MAX1801 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
V BATT = +3.6V
V OUT = +12V V OUT = +18V
V OUT = +7V
Note 1: All devices are 100% tested at T A = +25°C. All limits over the temperature range are guaranteed by design.
Note 2: Oscillator signal is generated by the MAX1800 or MAX1802.