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)
(V
IN
= +12V, V
ON/OFF
= +12V, I
OUT
= 0, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C. See the
Typical Operating Circuit.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Switch On-Resistance R
DS(ON)
I
SWITCH
= 500mA 0.4 0.80 Ω
PFM Threshold I
PFM
Minimum switch current in any cycle 35 65 95 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 1.53 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
109 125 135 kHz
Maximum Duty Cycle D
MAX
MAX5033D 95 %
VOLTAGE REGULATOR
Regulator Output Voltage VD V
IN
= 8.5V to 76V, I
L
= 0mA 6.9 7.8 8.8 V
Dropout Voltage 7.5V ≤ V
IN
≤ 8.5V, I
L
= 1mA 2.0 V
Load Regulation ΔVD/ΔI
VD
0 to 5mA 150 Ω
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range V
IN
MAX5033A 7.5 76.0
V
MAX5033B 7.5 76.0
MAX5033C 15 76
MAX5033D 7.5 76.0
Undervoltage Lockout UVLO 5.2 V
Output Voltage V
OUT
MAX5033A, V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 500mA
3.185 3.3 3.415
V
MAX5033B, V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 500mA
4.825 5.0 5.175
MAX5033C, V
IN
= 15V to 76V,
I
OUT
= 20mA to 500mA
11.58 12 12.42
MAX5033 500mA, 76V, High-Efciency, MAXPower
Step-Down DC-DC Converter
www.maximintegrated.com
Maxim Integrated │ 3
Electrical Characteristics (MAX5033_A_ _)
Electrical Characteristics (MAX5033_U_ _) (continued)