Datasheet

(V
IN
= 24V, V
EN
= 5V, V
GND
= V
PGND
= 0V, C
IN
= 1µF, C
VCC
= 4.7µF, R
RT
= 49.9kΩ, T
A
= T
J
= -40°C to +125°C, unless otherwise
noted. Typical values are at T
A
= +25°C.) (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 µA
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 µA
OSCILLATOR
Switching Frequency (100kHz) f
SW
R
RT
= 150kΩ 80 100 120 kHz
Switching Frequency (300kHz) f
SW
R
RT
= 49.9kΩ 270 300 330 kHz
Switching Frequency (1MHz) f
SW
R
RT
= 14.3kΩ 0.9 1 1.1 MHz
Switching Frequency Adjustment
Range
(Note 3) 100 1000 kHz
RT Voltage V
RT
R
RT
= 49.9kΩ 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
MAX15046A/B 1.5
V
MAX15046C 0.75
Minimum Controllable On-Time 70 125 ns
Maximum Duty Cycle D
MAX
f
SW
= 300kHz
(R
RT
= 49.9kΩ)
MAX15046A/B 85 87.5
%
MAX15046C 90 93
Minimum Low-Side On-Time
f
SW
= 1MHz
(R
RT
= 14.3kΩ)
MAX15046A/B 110
ns
MAX15046C 90
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
Ω
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
MAX15046 40V, High-Performance, Synchronous
Buck Controller
www.maximintegrated.com
Maxim Integrated │ 3
Electrical Characteristics (continued)