MAX8543 MAXIM [Maxim Integrated Products], MAX8543 Datasheet - Page 3

• Manufacturer Part Number: MAX8543
• Description: Step-Down Controllers with Prebias Startup, Lossless Sensing, Synchronization, and OVP
• Manufacturer: MAXIM [Maxim Integrated Products]

ELECTRICAL CHARACTERISTICS (continued)
(V
Current-Limit Threshold
Negative Current-Limit Threshold
CS+, CS- Input Current
CS+, CS- Input Common-Mode Range
OSCILLATOR
Switching Frequency
Minimum Off-Time
Minimum On-Time
FSYNC Synchronization Range
FSYNC Input High Pulse Width
FSYNC Input Low Pulse Width
FSYNC Rise/Fall Time
SYNCO Phase Shift from DH Rising
SYNCO Output Low Level
SYNCO Output High Level
MOSFET DRIVERS
DH On-Resistance, High State
DH On-Resistance, Low State
DL On-Resistance, High State
DL On-Resistance, Low State
Break-Before-Make Dead Time
LX, BST, IN Leakage Current
THERMAL PROTECTION
Thermal Shutdown
Thermal-Shutdown Hysteresis
IN
= 13.2V, V
Lossless Sensing, Synchronization, and OVP
Step-Down Controllers with Prebias Startup,
PARAMETER
BST
- V
_______________________________________________________________________________________
LX
= 5V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
V
V
V
V
V
V
V
V
% of positive-direction current limit V
V
R
R
Measured at DH
Measured at DH
R
at maximum duty cycle
I
I
(V
(V
(V
(V
V
V
V
V
Low-side off to high-side on
High-side off to low-side on
V
Rising temperature
SYNCO
SYNCO
CS+
CS+
CS+
CS+
LX
LX
LX
LX
CS+
VL
VL
VL
VL
BST
FSYNC
FSYNC
FSYNC
BST
BST
BST
BST
- V
- V
- V
- V
= 5V
= 3V
= 5V
= 3V
= 18.7V, V
- V
- V
- V
- V
= V
- V
- V
- V
- V
PGND
PGND
PGND
PGND
= 5mA
= 5mA
= 18.2kΩ
= 158kΩ
= 18.2kΩ, free-running mode,
CS-
CS-
CS-
CS-
LX
LX
LX
LX
CS-
) = 5V
) = 3V
) = 5V
) = 3V
, V
, V
, V
, V
, R
, R
, V
, V
= 0 or 5V
ILIM1
ILIM1
ILIM1
ILIM1
FB
FB
ILIM2
ILIM2
LX
= 0.8V (MAX8543 only)
= 0V (MAX8543 only)
CONDITIONS
= 13.2V, V
= 0V
= (1/3)V
= V
= (2/3)V
= 50kΩ (MAX8544 only)
= 200kΩ (MAX8544 only)
VL
VL
VL
IN
= 13.2V
LX
- V
PGND
V
127.5
-42.5
38.5
-160
-110
VL
A
MIN
170
800
150
160
100
100
165
-20
-25
-40
85
0
= +25°C.)
- 1V
+160
1000
-200
-130
TYP
100
150
200
200
220
180
-50
-30
-50
1.2
1.2
1.2
0.6
0.8
50
90
55
40
15
1
1
1
172.5
-57.5
MAX
1200
1200
-240
-150
56.5
13.2
+40
115
230
270
145
100
195
-40
-85
0.4
2.5
2.5
2.5
1.7
5
Degrees
UNITS
kHz
kHz
mV
µA
µA
ns
ns
ns
ns
ns
ns
°C
°C
%
Ω
Ω
Ω
Ω
V
V
V
3