Datasheet

MAX8650
4.5V to 28V Input Current-Mode Step-Down
Controller with Adjustable Frequency
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, V
BST
- V
LX
= 6.5V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
FSYNC Synchronization Range 160 1200 kHz
FSYNC Input-High Pulse Width 100 ns
FSYNC Input-Low Pulse Width 100 ns
FSYNC Rise/Fall Time 100 ns
SYNCO Phase Shift 180 D eg r ees
SYNCO Output Low Level I
SYNCO
= 5mA 0.4 V
SYNCO Output High Level I
SYNCO
= 5mA
V
AVL
-
1V
V
FSYNC Pin Threshold
for SYNC Mode
1.7 2.5 V
FSYNC Input Low 0.4 V
FSYNC Input High 2.5 V
FET DRIVERS
V
BST
- V
LX
= 6.5V 1.13 1.8
DH On-Resistance, High State
V
BST
- V
LX
= 5V
1.4 2.2
Ω
V
BST
- V
LX
= 6.5V 1.0 2
DH On-Resistance, Low State
V
BST
- V
LX
= 5V
1.3 2.2
Ω
V
VL
= 6.5V 1.6 2.5
DL On-Resistance, High State
V
VL
= 5V
1.7 2.8
Ω
V
VL
= 6.5V 0.8 1.5
DL On-Resistance, Low State
V
VL
= 5V 0.85 1.5
Ω
Break-Before-Make Dead Time Low side off to high side on, high side off to low side on 20 30 ns
LX, BST Leakage Current V
BST
= 35V, V
LX
= 28V, V
IN
= 28V 5 µA
THERMAL PROTECTION
Thermal Shutdown Rising temperature +160 °C
Thermal-Shutdown Hysteresis 15 °C