Datasheet

(Circuit references are from Table 1 in the Main Application Circuits section, C
VL
= 0.47µF, C
REF
= 0.1°F, T
A
= +25°C, unless otherwise
noted.)
Note 3: Parameters to -40°C are guaranteed by design and characterization.
(V
SHDN
= V
IN
= +12V, SYNC = GND, PGND = GND, R
FREQ
= 147kΩ ±1%, C
VL
= 0.47µF, C
REF
= 0.1µF, T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 3)
PARAMETER CONDITIONS MIN MAX UNITS
POL, SYNC Input Current POL, SYNC = GND or VL 40 µA
SHDN Input Current
V
SHDN
= +5V or GND -12 0
µA
V
SHDN
= +16.5V 6
EXT OUTPUT
EXT On-Resistance
EXT high or low, I
EXT
= 100mA, V
IN
= +5V 7.5
Ω
EXT high or low, I
EXT
= 100mA, V
IN
= +3V 12
1.238
1.246
1.242
1.254
1.250
1.258
1.262
-40 20 40-20
06
080 100
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1846/7 toc06
TEMPERATURE (C)
V
REF
(V)
0
0.4
0.2
0.8
0.6
1.0
1.2
1.4
1.6
0462810 12 14 16
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1846/7 toc05
V
IN
(V)
I
IN
(mA)
V
FB
= -0.1V
-12.10
-12.04
-12.06
-12.08
-12.02
-12.00
-11.98
-11.96
-11.94
-11.92
-11.90
0 200100 300 400 500 600
OUTPUT VOLTAGE LOAD REGULATION
MAX1846/7 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
APPLICATION CIRCUIT B V
IN
= 5V
90
0
1 100010010
EFFICIENCY vs. LOAD CURRENT
30
10
70
50
100
40
20
80
60
MAX1846/7 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 12V
V
IN
= 16.5V
APPLICATION CIRCUIT C
V
OUT
= -48V
100
0
110 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
20
MAX1846/7 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V
IN
= 5V
V
IN
= 3.3V
V
OUT
= -12V
APPLICATION CIRCUIT B
V
IN
= 3V
100
0
110 100 1000 10,000
EFFICIENCY vs. LOAD CURRENT
20
MAX1846/7 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
40
60
80
70
50
30
10
90
V
IN
= 5V
V
IN
= 16.5V
V
OUT
= -5V
APPLICATION CIRCUIT A
Maxim Integrated │ 5
www.maximintegrated.com
MAX1846–MAX1847 High-Efciency, Current-Mode,
Inverting PWM Controller
Typical Operating Characteristics
Electrical Characteristics (continued)