MAX8543 MAXIM [Maxim Integrated Products], MAX8543 Datasheet - Page 5

• 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-SENSE AMPLIFIER
Voltage Gain
CURRENT LIMIT
ILIM2 Output Current (MAX8544 Only)
ILIM1 Input Current
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
LX, BST, IN Leakage Current
IN
= 13.2V, V
Lossless Sensing, Synchronization, and OVP
Step-Down Controllers with Prebias Startup,
PARAMETER
BST
- V
_______________________________________________________________________________________
LX
= 5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
V
R
V
V
V
V
V
V
V
V
V
% of positive-direction current limit V
V
R
Measured at DH
Measured at DH
R
I
I
(V
(V
V
V
V
SYNCO
SYNCO
OUT
ILIM1
CS+
CS+
CS+
CS+
LX
LX
LX
LX
CS+
VL
VL
BST
ILIM2
FSYNC
FSYNC
BST
BST
- V
- V
- V
- V
= 5V
= 5V
= 18.7V, V
- V
- V
- V
- V
= V
= 0 to 13V
- V
- V
= 0V or V
= 50kΩ to 200kΩ
PGND
PGND
PGND
PGND
= 5mA
= 5mA
= 18.2kΩ
= 18.2kΩ
CS-
CS-
CS-
CS-
LX
LX
CS-
) = 5V
) = 5V
, V
, V
, V
, V
, R
, R
, V
, V
= 0V or 5V
ILIM1
ILIM1
ILIM1
ILIM1
FB
FB
ILIM2
ILIM2
LX
VL
= 0.8V (MAX8543 only)
= 0V (MAX8543 only)
CONDITIONS
= 13.2V, V
= 0V
= (1/3)V
= (2/3)V
= V
= 50kΩ (MAX8544 only)
= 200kΩ (MAX8544 only)
VL
VL
VL
IN
= 13.2V
V
V
V
V
ILIM1
ILIM1
ILIM1
ILIM1
LX
= 0V
= (1/3)V
= (2/3)V
= V
- V
PGND
VL
VL
VL
V
127.5
VL
-160
-110
MIN
38.5
170
800
150
160
100
100
165
-40
-20
-25
-40
8.8
4.8
3.2
2.4
4.2
85
-1
0
- 1V
172.5
MAX
1200
1200
13.2
56.5
-240
-150
13.2
+40
115
230
270
140
100
195
-60
-40
-85
7.2
4.8
3.6
5.5
0.4
2.5
2.5
2.5
1.7
+1
5
Degrees
UNITS
kHz
kHz
V / V
mV
µA
µA
µA
µA
ns
ns
ns
ns
ns
%
Ω
Ω
Ω
Ω
V
V
V
5