Datasheet

MAX15035
15A Step-Down Regulator with Internal Switches
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= V
EN
= 5V, REFIN = ILIM = REF, SKIP = GND. T
A
= 0°C to +85°C, unless otherwise spec-
ified. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
U l tr asoni c C ur r ent- Li m i t
Thr eshol d
SKIP = open (3.3V); V
FB
= V
REFIN
+ 50mV,
V
GND
- V
LX
-35 mV
Internal BST Switch
On-Resistance
R
BST
I
BST
= 10mA, V
DD
= 5V 4 7 Ω
INPUTS AND OUTPUTS
EN Logic-Input Threshold V
EN
EN rising edge, hysteresis = 450mV (typ) 1.20 1.7 2.20 V
EN Logic-Input Current I
EN
EN forced to GND or V
DD
, T
A
= +25°C -0.5 +0.5 μA
High (5V V
DD
)
V
CC
-
0.4
Open (3.3V) 3.0 3.6
Ref (2.0V) 1.7 2.3
SKIP Quad-Level Input Logic
Levels
V
SKIP
Low (GND) 0.4
V
SKIP Logic-Input Current I
SKIP
SKIP forced to GND or V
DD
, T
A
= +25°C -2 +2 μA
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= 12V, V
DD
= V
CC
= V
EN
= 5V, REFIN = ILIM = REF, SKIP = GND. T
A
= -40°C to +85°C, unless otherwise
specified.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
PWM CONTROLLER
Input Voltage Range V
IN
4.5 26 V
Quiescent Supply Current (V
DD
)I
DD
+ I
CC
FB forced above REFIN 1.2 mA
R
TON
= 97.5kΩ (600kHz) 115 213
R
TON
= 200kΩ (300kHz) 270 336On-Time t
ON
V
IN
= 12V,
V
FB
= 1.0V
(Note 3)
R
T ON
= 302.5kΩ ( 200kH z) 368 516
ns
Minimum Off-Time t
OFF
(
MIN
)
(Note 3) 400 ns
REFIN Voltage Range V
REFIN
(Note 2) 0 V
REF
V
FB Voltage Range V
FB
(Note 2) 0 V
REF
V
V
REFIN
= 0.5V 0.49 0.51
V
REFIN
= 1.0V 0.99 1.01FB Voltage Accuracy V
FB
M easur ed at FB,
V
I N
= 4.5V to
26V , SKIP =
V
DD
V
REFIN
= 2.0V 1.985 2.015
V