User Manual

MAX5082/MAX5083
1.5A, 40V, MAXPower Step-Down
DC-DC Converters
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
ON/OFF
= 12V, V
REG
= V
DVREG
, V
SYNC
= PGND = SGND, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values
are at T
A
= + 25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OSCILLATOR
Frequency f
SW
V
SYNC
= 0V 225 250 275 kHz
V
SYNC
= 0V, V
IN
= 4.5V, MAX5082 87
V
SYNC
= 0V, V
IN
= 7.5V, MAX5083 87Maximum Duty Cycle D
MAX
V
SYNC
= 0V, V
IN
≤ 40V 87
%
SYNC High-Level Voltage 2.2 V
SYNC Low-Level Voltage 0.8 V
SYNC Frequency Range f
SYNC
150 350 kHz
PWM Modulator Gain f
SYNC
= 150kHz to 350kHz 10 V/V
Ramp Level Shift (Valley) 0.3 V
POWER SWITCH
Switch On-Resistance V
BST
- V
LX
= 6V 0.3 0.6 Ω
Switch Gate Charge V
BST
- V
LX
= 6V 6 nC
Switch Leakage Current V
IN
= 40V, V
LX
= V
BST
= 0V 10 µA
BST Leakage Current V
BST
= V
LX
= V
IN
= 40V 10 µA
CHARGE PUMP
C- Output Voltage Low MAX5082 only, sinking 10mA 0.1 V
C- Output Voltage High
MAX5082 only, relative to DVREG,
sourcing 10mA
0.1 V
DVREG to C+ On-Resistance MAX5082 only, sourcing 10mA 10 Ω
LX to PGND On-Resistance Sinking 10mA 12 Ω
CURRENT-LIMIT COMPARATOR
Pulse-Skip Threshold I
PFM
100 200 300 mA
Cycle-by-Cycle Current Limit I
ILIM
1.9 2.7 3.5 A
Number of Consecutive ILIM
Events to Hiccup
4
Hiccup Timeout 512
Clock
periods
INTERNAL VOLTAGE REGULATOR
MAX5082 4.75 5 5.25
Output Voltage V
REG
MAX5083 7.6 8 8.4
V
V
IN
= 5.5V to 40V, MAX5082 1
Line Regulation
V
IN
= 9.0V to 40V, MAX5083 1
mV/V
Load Regulation I
REG
= 0 to 20mA 0.25 V
V
IN
= 4.5V, I
REG
= 20mA, MAX5082 0.5
Dropout Voltage
V
IN
= 7.5V, I
REG
= 20mA, MAX5083 0.5
V
THERMAL SHUTDOWN
Thermal Shutdown Temperature Temperature rising +160 °C
Thermal Shutdown Hysteresis 20 °C
Note 1: 100% production tested at T
A
= +25°C and T
A
= +125°C. Limits at -40°C are guaranteed by design.