Instruction Manual

MAX15026
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
4 _______________________________________________________________________________________
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LIM Reference Current I
LIM
V
LIM
= 0.3V to 3V (Note 4) 45 50 55 µA
LIM Reference Current Tempco V
LIM
= 0.3V to 3V 2300 ppm/°C
Number of Consecutive Current-
Limit Events to Hiccup
7 Events
Soft-Start Timeout 4096
Switching
Cycles
Soft-Start Restart Timeout 8192
Switching
Cycles
Hiccup Timeout Out of soft-start 4096
Switching
Cycles
Peak Low-Side Sink Current
Limit
Sink limit = 1.5V, R
LIM
= 30kΩ (Note 4) 75 mV
BOOST
Boost Switch Resistance V
IN
= V
CC
= 5V, I
BST
= 10mA 3 8 Ω
POWER-GOOD OUTPUT
PGOOD Threshold Rising 88 93 97 % V
FB
PGOOD Threshold Falling 86 90 94 %V
FB
PGOOD Output Leakage I
LEAK_PGD
V
IN
= V
PGOOD
= 28V, V
EN
= 5V, V
FB
= 1V -1 +1 µA
PGOOD Output Low Voltage V
PGOOD_L
I
PGOOD
= 2mA, EN = GND 0.4 V
THERMAL SHUTDOWN
Thermal-Shutdown Threshold Temperature rising +150 °C
Thermal-Shutdown Hysteresis Temperature falling 20 °C
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 12V, R
RT
= 27kΩ, R
LIM
= 30kΩ, C
VCC
= 4.7µF, C
IN
= 1µF, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (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: where f
SW
is in Hertz.
Note 4: T
A
= +25°C.
R
17.3 10
f 1x10 )x(f
RT
9
SW
7
SW
=
×
+
−
()
2