Electrical characteristics (continued) – Rainbow Electronics MAX1855 User Manual
Page 3
MAX1716/MAX1854/MAX1855
High-Speed, Adjustable, Synchronous Step-Down
Controllers with Integrated Voltage Positioning
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = +15V, V
CC
= V
DD
= 5V, SKIP = V
CC
, VPS = PGND, T
A
= 0°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
BIAS AND REFERENCE
Quiescent Supply Current (V
CC
)
I
CC
Measured at V
CC
, FB forced above the
regulation point
700
950
µA
Quiescent Supply Current (V
DD
)
I
DD
Measured at V
DD
, FB forced above the
regulation point
<1
5
µA
Quiescent Supply Current (V+)
I+
25
40
µA
Shutdown Supply Current (V
CC
)
SHDN = GND
<1
5
µA
Shutdown Supply Current (V
DD
)
SHDN = GND
<1
5
µA
Shutdown Supply Current (V+)
SHDN = GND, V
CC
= V
DD
= 0 or 5V
<1
5
µA
Reference Voltage
V
REF
V
CC
= 4.5V to 5.5V, no external REF load
1.98
2
2.02
V
Reference Load Regulation
I
REF
= 0 to 50
µA
0.01
V
REF Sink Current
I
REF
REF in regulation
10
µA
REF Fault Lockout Voltage
Falling edge
1.6
V
FAULT PROTECTION
MAX1716
1.8
1.9
2.0
Output Overvoltage Fault
Threshold (Note 5)
Measured at FB
MAX1855
1.97
2.0
2.03
V
Output Overvoltage Fault
Propagation Delay (Note 5)
FB forced to 2% above trip threshold
(MAX1716/MAX1855 only)
1.5
µs
Output Undervoltage Fault
Threshold (Foldback)
35
40
45
%
Output Undervoltage Fault
Propagation Delay
FB forced to 2% below trip threshold
10
µs
Output Undervoltage Fault
Blanking Time (Foldback)
From
SHDN signal going high
10
30
ms
Current-Limit Threshold
(Positive, Default)
V
ITH
V
PGND
- V
CS
, ILIM = V
CC
110
120
130
mV
V
ILIM
= 0.5V
40
50
60
Current-Limit Threshold
(Positive, Adjustable)
V
ITH
V
PGND
- V
CS
V
ILIM
= 2V (REF)
170
200
230
mV
Negative Current-Limit
Threshold
V
PGND
- V
CS
-1.2
×
V
ITH
mV
Zero-Crossing Current-Limit
Threshold
V
PGND
- V
CS
3
mV
Thermal Shutdown Threshold
Hysteresis = 10°C
150
°C
V
CC
Undervoltage Lockout
Threshold
Rising edge, hysteresis = 20mV, switching
disabled below this level
4.0
4.45
V