Electrical characteristics, Absolute maximum ratings – Rainbow Electronics MAX789 User Manual
Page 2
MAX787/MAX788/MAX789
5V/3.3V/3V 5A Step-Down, PWM,
Switch-Mode DC-DC Regulators
2
_______________________________________________________________________________________
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45V
Switch Voltage with Respect to Input Voltage. . . . . . . . . . . . . . . . 50V
Switch Voltage with Respect to GND Pin (V
SW
negative)
(Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V
SENSE Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V, +10V
Operating Temperature Ranges
MAX78_CCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
MAX78_ECK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Junction Temperature Ranges
MAX78_CCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +125°C
MAX78_ECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 40°C to +125°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . -65°C to +160°C
Lead Temperature (soldering, 10sec). . . . . . . . . . . . . . . . . . . . +300°C
ELECTRICAL CHARACTERISTICS
(V
IN
= 25V, T
j
= T
MIN
to T
MAX
, unless otherwise noted.)
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.
ABSOLUTE MAXIMUM RATINGS
PARAMETER
CONDITIONS
Start-Up Mode (Note 4)
3.5
5.0
MIN
TYP
MAX
UNITS
Switching Frequency Line Regulation
8V
≤
V
IN
≤
40V
Switch-Current Limit (Note 5)
5.5
6.5
8.5
A
T
j
< 0°C
90
100
110
T
j
≥
0°C
85
120
V
OUT
= V
SENSE
= 0V (Note 5)
20
Switching Frequency
kHz
0.03
0.10
%/V
Error-Amplifier Voltage Gain
1V
≤
V
C
≤
4V
2000
V/V
Error-Amplifier Transconductance
3000
5000
9000
µmho
Error-Amplifier Source Current
V
SENSE
= V
OUT
- 10%
100
140
225
T
j
= +25°C
µA
Error-Amplifier Sink Current
I
SW
= 1A
V
SENSE
= V
OUT
+ 10%
0.6
1.0
1.7
1.85
T
j
≤
+125°C
mA
T
j
= +25°C
T
j
= +25°C
Switch-On Voltage (Note 1)
T
j
= +25°C
T
j
= +25°C
2.10
V
T
j
= +25°C
Supply Current (Note 3)
mA
V
IN
≤
40V, V
SENSE
= 5.5V
8.5
11
Minimum Supply Voltage
Normal Mode
7.3
8.0
V
3.5
4.8
T
j
= +25°C
T
j
= +25°C
V
IN
=
≤
25V, V
SW
= 0V
5
300
Switch-Off Leakage
V
IN
= 40V, V
SW
= 0V
10
500
µA
T
j
< 0°C
T
j
≥
0°C
I
SW
= 5A
2.30
2.50
Input Supply Voltage Range
8.0
40.0
V
Maximum Duty Cycle
85
90
%
T
j
≥
0°C
T
j
< 0°C