Rainbow Electronics MAX5083 - Manual (Page 3)

MAX5082/MAX5083
1.5A, 40V, MAXPower Step-Down
DC-DC Converters
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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 87 Maximum 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.