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
SHDN
= V
IN
= +12V, SYNC = GND, PGND = GND, R
FREQ
= 147kΩ ±1%, C
VL
= 0.47µF, C
REF
= 0.1µF,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
PWM CONTROLLER
Operating Input Voltage Range
UVLO Threshold
UVLO Hysteresis
FB Threshold
FB Input Current
Load Regulation
Line Regulation
Current-Limit Threshold
CS Input Current
Supply Current
Shutdown Supply Current
No load
V
FB
= -0.1V
C
COMP
= 0.068µF, V
OUT
= -48V,
I
OUT
= 20mA to 200mA (Note 1)
C
COMP
= 0.068µF, V
OUT
= -48V,
V
IN
= +8V to +16.5V, I
OUT
= 100mA
CS = GND
V
FB
= -0.1V, V
IN
= +3.0V to +16.5V
SHDN = GND, V
IN
= +3.0V to +16.5V
-12
-50
-1
0.04
85
100
10
0.75
10
1.236
3.85
1.25
-2
4.25
-20
115
20
1.2
25
1.264
-15
4.65
-60
V
IN
rising
V
IN
falling
-40°C to ~+85°C
-40°C to ~+105°C
-40°C to ~+85°C
-40°C to ~+105°C
2.6
2.59
3.0
2.8
2.8
2.74
2.74
60
0
-6
12
50
0
mV
mV
nA
%
%
mV
µA
mA
µA
V
mV
V
mV
16.5
2.95
2.96
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
V
IN
= +3.0V to +16.5V
REFERENCE AND VL REGULATOR
REF Output Voltage
I
REF
= 50µA
REF Load Regulation
VL Output Voltage
VL Load Regulation
I
REF
= 0 to 500µA
I
VL
= 100µA
I
VL
= 0.1mA to 2.0mA
www.maximintegrated.com
Maxim Integrated
│
2
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
Electrical Characteristics (continued)
(V
SHDN
= V
IN
= +12V, SYNC = GND, PGND = GND, R
FREQ
= 147kΩ ±1%, C
VL
= 0.47µF, C
REF
= 0.1µF,
T
A
= 0°C to +85°C,
unless otherwise noted.)
PARAMETER
OSCILLATOR
Oscillator Frequency
CONDITIONS
R
FREQ
= 500kΩ
±1%
R
FREQ
= 147kΩ
±1%
R
FREQ
= 500kΩ
±1%
R
FREQ
= 147kΩ
±1%
R
FREQ
= 76.8kΩ
±1%
Maximum Duty Cycle
SYNC Input Signal Duty-Cycle
Range
Minimum SYNC Input Logic-Low
Pulse Width
SYNC Input Rise/Fall Time
SYNC Input Frequency Range
DIGITAL INPUTS
POL, SYNC,
SHDN
Input High
Voltage
POL, SYNC,
SHDN
Input Low
Voltage
POL, SYNC Input Current
SHDN
Input Current
SOFT-START
Soft-Start Clock Cycles
Soft-Start Levels
EXT OUTPUT
EXT Sink/Source Current
EXT On-Resistance
V
IN
= +5V, V
EXT
forced to +2.5V
1
3
5
7.5
12
A
Ω
EXT high or low, tested with 100mA load, V
IN
= +5V
EXT high or low, tested with 100mA load, V
IN
= +3V
POL, SYNC = GND or VL
V
SHDN
= +5V or GND
V
SHDN
= +16.5V
-12
20
-4
1.5
1024
64
2.0
0.45
40
0
6
V
V
µA
µA
(Note 2)
100
MIN
88
255
93
85
7
50
TYP
100
300
500
96
88
80
93
200
200
550
%
ns
ns
kHz
98
92
%
MAX
112
345
kHz
UNITS
R
FREQ
= 76.8kΩ
±1%
Note 1:
Production test correlates to operating conditions.
Note 2:
Guaranteed by design and characterization.
www.maximintegrated.com
Maxim Integrated
│
3
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
Electrical Characteristics
(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
PWM CONTROLLER
Operating Input Voltage Range
UVLO Threshold
FB Threshold
FB Input Current
Load Regulation
Current Limit Threshold
CS Input Current
Supply Current
Shutdown Supply Current
REF Output Voltage
REF Load Regulation
VL Output Voltage
VL Load Regulation
OSCILLATOR
Oscillator Frequency
Maximum Duty Cycle
SYNC Input Signal Duty-Cycle
Range
Minimum SYNC Input Logic Low
Pulse Width
SYNC Input Rise/Fall Time
SYNC Input Frequency Range
DIGITAL INPUTS
POL, SYNC,
SHDN
Input High
Voltage
POL, SYNC,
SHDN
Input Low
Voltage
2.0
0.45
V
V
(Note 2)
100
V
IN
rising
No load
V
IN
falling
V
FB
= -0.1V
-40°C to ~+85°C
-40°C to ~+105°C
CONDITIONS
MIN
3.0
2.6
-20
-50
-150
-2
85
+20
+50
+150
0
115
20
1.2
25
1.225
3.85
1.275
-15
4.65
-60
84
255
93
84
7
116
345
98
93
93
200
200
550
MAX
16.5
2.95
UNITS
V
V
mV
nA
%
mV
µA
mA
µA
V
mV
V
mV
kHz
%
%
ns
ns
kHz
C
COMP
= 0.068µF, V
OUT
= -48V,
I
OUT
= 20mA to 200mA (Note 1)
CS = GND
V
FB
= -0.1V, V
IN
= +3.0V to +16.5V
SHDN
= GND, V
IN
= +3.0V to +16.5V
I
REF
= 50µA
I
VL
= 100µA
REFERENCE AND VL REGULATOR
I
REF
= 0 to 500µA
I
VL
= 0.1mA to 2.0mA
R
FREQ
= 500kΩ
±1%
R
FREQ
= 147kΩ
±1%
R
FREQ
= 500kΩ
±1%
R
FREQ
= 147kΩ
±1%
www.maximintegrated.com
Maxim Integrated
│
4
MAX1846/MAX1847
High-Efficiency, Current-Mode,
Inverting PWM Controller
Electrical Characteristics (continued)
(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
POL, SYNC Input Current
SHDN
Input Current
EXT OUTPUT
EXT On-Resistance
CONDITIONS
POL, SYNC = GND or VL
V
SHDN
= +5V or GND
V
SHDN
= +16.5V
EXT high or low, I
EXT
=
100mA, V
IN
= +5V
-40°C to ~+85°C
-40°C to ~+105°C
-12
MIN
MAX
40
0
6
7.5
8.75
12
Ω
UNITS
µA
µA
EXT high or low, I
EXT
= 100mA, V
IN
= +3V
Note 3:
Parameters to -40°C are guaranteed by design and characterization.
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