Electrical characteristics (continued) – Rainbow Electronics MAX8720 User Manual
Page 4
MAX8720
Dynamically Adjustable 6-Bit VID
Step-Down Controller
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V+ = 15V, SHDN = SKIP = V
DD
= V
CC
= +5V, V
OUT
= 1.25V, 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
T
A
= +25
°C to +85°C
90
100
110
Current-Limit Threshold (Fixed)
V
LIMIT
V
PGND
- V
LX
,
ILIM = V
CC
T
A
= 0
°C to +85°C
85
115
mV
V
ILIM
= 2.00V
165
200
230
Current-Limit Threshold
(Adjustable)
V
LIMIT
V
PGND
- V
LX
V
ILIM
= 0.50V
35
50
65
mV
V
LX
- V
PGND
, SKIP = ILIM = V
CC
,
-140
-117
-90
mV
Current-Limit Threshold
(Negative)
V
NEG
V
LX
- V
PGND
, SKIP = V
CC
, adjustable mode,
percent of current limit
-117
%
Current-Limit Threshold (Zero
Crossing)
V
ZX
V
PGND
- V
LX
, SKIP = GND
4
mV
Current-Limit Default
Switchover Threshold
3
V
CC
-
1
V
CC
-
0.4
V
ILIM Leakage Current
0.1
µA
GATE DRIVERS
QSOP package
1.0
3.5
DH Gate-Driver On-Resistance
(Note 3)
R
DH
BST-LX forced to 5V
TQFN package
1.0
4.5
Ω
QSOP package
1.0
3.5
DL, high state
TQFN package
1.0
4.0
DL Gate-Driver On-Resistance
(Note 3)
R
DL
DL, low state
0.4
1.0
Ω
DH Gate-Driver Source/Sink
Current
I
DH
DH forced to 2.5V, BST-LX forced to 5V
2
A
DL Gate-Driver Source Current
I
DL
(SOURCE)
DL forced to 2.5V
1.6
A
DL Gate-Driver Sink Current
I
DL (SINK)
DL forced to 2.5V
4
A
DL rising
35
Dead Time
t
DEAD
DH rising
26
ns
INPUTS AND OUTPUTS
Logic high
2.4
Logic low
0.4
SHDN Input Level
V
SHDN
No-fault mode
12
15
V
Logic Input High Voltage
V
IH
D0–D5, SKIP, SUS
2.4
V
Logic Input Low Voltage
V
IL
D0–D5, SKIP, SUS
0.8
V
Logic Input Current
D0–D5, SKIP, SUS
-1
+1
µA
High
V
CC
-
0.2
Open
3.15
3.85
REF
1.65
2.35
Four-Level Input Logic
TON, S0, S1
GND
0.5
V
Input Leakage Current
SHDN, TON, S0, S1 forced to V
CC
or GND
-3
+3
µA