User guide

40V, High-Performance Synchronous
Buck Controller
MAX15046
4 ______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 24V, V
EN
= 5V, V
GND
= V
PGND
= 0V, C
IN
= 1FF, C
VCC
= 4.7FF, R
RT
= 49.9kI, T
A
= T
J
= -40NC to +125NC, unless otherwise
noted. Typical values are at T
A
= +25NC.) (Note 2)
Note 2: All devices are 100% tested at room temperature and guaranteed by design over the specified temperature range.
Note 3: Select R
RT
as:
9
RT
-7 2
SW SW
17.3 10
R
f (1 x 10 )(f )
×
=
+
, where f
SW
is in Hertz.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DL Peak Current C
LOAD
= 10nF
Sinking, V
DRV
= V
CC
= 5.25V
3
A
Sourcing, V
DRV
=
V
CC
= 5.25V
2
DH, DL Break-Before-Make Time
(Dead Time)
10 ns
SOFT-START
Soft-Start Duration 2048
Switching
Cycles
Reference Voltage Steps 64 Steps
CURRENT LIMIT/HICCUP
Cycle-by-Cycle Valley Current-
Limit Threshold Adjustment
Range
V
CSP
- V
PGND
,
valley limit =
V
LIM
/10
V
LIM
= 0.3V 30
mV
V
LIM
= 3V 300
LIM Reference Current I
LIM
V
LIM
= 0.3V to 3V, T
A
= +25NC
45 50 55
FA
LIM Reference Current
Temperature Coefficient
2300
ppm/NC
CSP Input Bias Current V
CSP
= 40V -1 +1
FA
Number of Consecutive Current-
Limit Events to Hiccup
7 Events
Hiccup Timeout 4096
Switching
Cycles
Peak Low-Side Sink Current-Limit
Threshold
V
CSP
- V
PGND
, sink limit = V
LIM
/20,
R
ILIM
= 30kI, V
LIM
= 1.5V,
T
A
= +25NC
75 mV
POWER-GOOD (PGOOD)
PGOOD Threshold V
FB
rising 90 94 97.5 %V
FB
PGOOD Threshold Hysteresis V
FB
falling 2.65 %V
FB
PGOOD Output Low Voltage V
PGOOD_L
I
PGOOD
= 2mA, V
EN
= 0V 0.4 V
PGOOD Output Leakage Current I
LEAK_PGOOD
V
PGOOD
= 40V, V
EN
= 5V, V
FB
= 1V -1 +1
FA
THERMAL SHUTDOWN
Thermal Shutdown Threshold Temperature rising +150
NC
Thermal Shutdown Hysteresis 20
NC