Datasheet

MAX16955
36V, 1MHz Step-Down Controller
with Low Operating Current
4
Maxim Integrated
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
GATE DRIVE
DH = high state 10
DH Gate-Driver On-Resistance R
DH
DH = low state 2

DL = high state 3.5
DL Gate-Driver On-Resistance R
DL
DL = low state 2

DL rising (Note 5) 60
DH/DL Dead Time (Note 4) t
DEAD
DH rising (Note 5) 60
ns
BST Input Current I
BST
V
LX
= 0V, V
BST
= 5V,
V
DH
- V
LX
= V
DL
- V
PGND
= 0V
1 μA
BST On-Resistance (Note 5) 5 15 
ENABLE INPUT
EN Input Threshold Low V
EN,LO
1.2 V
EN Input Threshold High V
EN,HI
2.2 V
EN Threshold Voltage
Hysteresis
0.2 V
EN Input Current I
EN
0.5 μA
SOFT-START
Soft-Start Ramp Time t
SS
5 ms
Note 2: Devices tested at T
A
= +25°C. Limits over temperature are guaranteed by design.
Note 3: For 3.5V operation, the n-channel MOSFET’s threshold voltage should be compatible to (lower than) this input voltage.
Note 4: Device not in dropout condition.
Note 5: Guaranteed by design; not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
SUP
= V
EN
= 14V, C
IN
= 10μF, C
OUT
= 94μF, C
BIAS
= 2.2μF, C
BST
= 0.1μF, R
FOSC
= 76.8kΩ, T
A
= T
J
= -40°C to +125°C, unless
otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)