User guide

40V, High-Performance, Synchronous
Buck Controller
MAX15046
_______________________________________________________________________________________ 3
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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
COMP-RAMP
Minimum Voltage 200 mV
COMP Source/Sink Current I
COMP
V
COMP
= 1.4V 50 80 110
FA
ENABLE (EN)
EN Input High V
EN_H
V
EN
rising 1.14 1.20 1.26 V
EN Input Low V
EN_L
V
EN
falling 1.05 V
EN Input Leakage Current I
EN
V
EN
= 5.5V -1 +1
FA
OSCILLATOR
Switching Frequency (100kHz) f
SW
R
RT
= 150kI
80 100 120 kHz
Switching Frequency (300kHz) f
SW
R
RT
= 49.9kI
270 300 330 kHz
Switching Frequency (1MHz) f
SW
R
RT
= 14.3kI
0.9 1 1.1 MHz
Switching Frequency Adjustment
Range
(Note 3) 100 1000 kHz
RT Voltage V
RT
R
RT
= 49.9kI
1.15 1.2 1.25 V
PWM MODULATOR
PWM Ramp Peak-to-Peak
Amplitude
V
RAMP
1.5 V
PWM Ramp Valley V
VALLEY
1.5 V
Minimum Controllable On-Time 70 125 ns
Maximum Duty Cycle
f
SW
= 300kHz (R
RT
= 49.9kI)
85 87.5 %
Minimum Low-Side On-Time
f
SW
= 1MHz (R
RT
= 49.9kI)
110 ns
OUTPUT DRIVERS/DRIVERS SUPPLY (V
DRV
)
Undervoltage Lockout V
DRV_UVLO
V
DRV
rising 4.0 4.2 4.4 V
DRV Undervoltage Lockout
Hysteresis
400 mV
DH On-Resistance
Low, sinking 100mA,
V
BST
- V
LX
= 5V
1 3
I
High, sourcing 100mA,
V
BST
- V
LX
= 5V
1.5 4
DL On-Resistance
Low, sinking 100mA,
V
DRV
= V
CC
= 5.25V
1 3
High, sourcing 100mA,
V
DRV
= V
CC
= 5.25V
1.5 4
DH Peak Current C
LOAD
= 10nF
Sinking,
V
BST
- V
LX
= 5V
3
A
Sourcing,
V
BST
- V
LX
= 5V
2