Datasheet

(V
IN
= +12V, V
ON/OFF
= +12V, I
OUT
= 0, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. See the
Typical Operating Circuit.) (Note 2)
Note 1: Switch current at which the current limit is activated.
Note 2: All limits at -40°C are guaranteed by design, not production tested.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Feedback Voltage V
FB
V
IN
= 7.5V to 76V, MAX5033D 1.192 1.221 1.250 V
Efciency η
V
IN
= 12V, I
LOAD
= 500mA, MAX5033A 86
%
V
IN
= 12V, I
LOAD
= 500mA, MAX5033B 90
V
IN
= 24V, I
LOAD
= 500mA, MAX5033C 94
V
IN
= 12V, V
OUT
= 5V, I
LOAD
= 500mA,
MAX5033D
90
Quiescent Supply Current I
Q
V
FB
= 3.5V, V
IN
= 7.5V to 76V, MAX5033A 270 440
µA
V
FB
= 5.5V, V
IN
= 7.5V to 76V, MAX5033B 270 440
V
FB
= 13V, V
IN
= 15V to 76V, MAX5033C 270 440
V
FB
= 1.3V, MAX5033D 270 440
Shutdown Current I
SHDN
V
ON/OFF
= 0V, V
IN
= 7.5V to 76V
10 45 µA
Peak Switch Current Limit I
LIM
(Note 1) 0.95 1.5 2.1 A
Switch Leakage Current I
OL
V
IN
= 76V, V
ON/OFF
= 0V, V
LX
= 0V
1 µA
Switch On-Resistance R
DS(ON)
I
SWITCH
= 500mA 0.4 0.80
PFM Threshold I
PFM
Minimum switch current in any cycle 35 65 110 mA
FB Input Bias Current I
B
MAX5033D -150 +0.01 +150 nA
ON/OFF CONTROL INPUT
ON/OFF Input-Voltage Threshold
V
ON/OFF
Rising trip point 1.50 1.69 1.85 V
ON/OFF Input-Voltage Hysteresis
V
HYST
100 mV
ON/OFF Input Current
I
ON/OFF
V
ON/OFF
= 0V to V
IN
10 150 nA
ON/OFF Operating Voltage Range
V
ON/OFF
76 V
OSCILLATOR
Oscillator Frequency f
OSC
105 125 137 kHz
Maximum Duty Cycle D
MAX
MAX5033D 95 %
VOLTAGE REGULATOR
Regulator Output Voltage VD V
IN
= 8.5V to 76V, I
L
= 0mA 6.5 7.8 9.0 V
Dropout Voltage 7.5V ≤ V
IN
≤ 8.5V, I
L
= 1mA 2.0 V
Load Regulation ΔVD/ΔI
VD
0 to 5mA 150
PACKAGE THERMAL CHARACTERISTICS
Thermal Resistance
(Junction to Ambient)
θ
JA
SO package (JEDEC 51) 170
°C/W
DIP package (JEDEC 51) 110
THERMAL SHUTDOWN
Thermal-Shutdown Junction
Temperature
T
SH
+160 °C
Thermal-Shutdown Hysteresis T
HYST
20 °C
MAX5033 500mA, 76V, High-Efciency, MAXPower
Step-Down DC-DC Converter
www.maximintegrated.com
Maxim Integrated
4
Electrical Characteristics (MAX5033_A_ _) (continued)