Electrical characteristics (continued), Electrical characteristics – Rainbow Electronics MAX1837 User Manual
Page 3
MAX1836/MAX1837
24V Internal Switch, 100% Duty Cycle,
Step-Down Converters
_______________________________________________________________________________________
3
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Zero-Crossing Timeout
LX does not rise above the threshold
30
µs
LX Switch Leakage Current
V
IN
= 18V, LX = GND, T
A
= +25
°C
1
µA
Dropout Voltage
V
DROPOUT
I
OUT
= 100mA, V
IN
= 5V
120
mV
Line Regulation
V
IN
= 5V to 24V
0.05
%
Load Regulation
I
OUT
= 0 to 125mA (MAX1836) or 250mA
(MAX1837)
0.3
%
Shutdown Input Threshold
V
SHDN
V
IN
= 4.5V to 24V (Note 3)
0.8
2.4
V
Shutdown Leakage Current
I
SHDN
V
SHDN
= 0 or 24V
-1
+1
µA
Thermal Shutdown
10
°C hysteresis (typ)
160
°C
ELECTRICAL CHARACTERISTICS (continued)
(Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V
IN
= 12V, SHDN = IN, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C,
unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply Range
V
IN
4.5
24
V
V
IN
rising
3.55
4.4
Input Undervoltage Lockout
Threshold
V
UVLO
V
IN
falling
3.45
4.3
V
Input Supply Current
I
IN
25
µA
Input Shutdown Current
SHDN = GND
7
µA
MAX183_EUT50
4.80
5.20
Output Voltage (Preset Mode)
V
OUT
FB = GND,
I
LOAD
= 0 to 125mA
(MAX1836) or
250mA (MAX1837)
MAX183_EUT33
3.168
3.432
V
Output Voltage Range
(Adjustable Mode)
V
OUT
(Note 2)
1.25
V
IN
V
Feedback Set Voltage
(Adjustable Mode)
V
FB
1.200
1.300
V
OUT Bias Current
V
OUT
= 5V
7.4
µA
FB Dual Mode Threshold
V
FB
rising or falling
50
150
mV
LX Switch Minimum Off-Time
t
OFF( M IN)
0.2
0.6
µs
LX Switch Maximum On-Time
t
ON (M AX )
V
FB
= 1.3V
7
13
µs
LX Switch On-Resistance
R
LX
V
IN
= 6V
2
Ω
MAX1836
250
450
LX Current Limit
I
LIM
MAX1837
500
900
mA
ELECTRICAL CHARACTERISTICS
(Circuits of Figures 1 (MAX1836) and 2 (MAX1837), V
IN
= 12V, SHDN = IN, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 4)