Datasheet

1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
ELECTRICAL CHARACTERISTICS (continued) (MAX5035_U_ _)
(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 Application Circuit. )
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Switch Leakage Current I
OL
V
IN
= 76V, V
ON/OFF
= 0V, V
LX
= 0V 0.01 1 µA
Switch On-Resistance R
DS
(
ON
)
I
SWITCH
= 1A 0.40 0.80 Ω
PFM Threshold I
PFM
Minimum switch current in any cycle 55 85 130 mA
FB Input Bias Current I
B
MAX5035D/E -150 +0.01 +150 nA
ON/OFF CONTROL INPUT
Rising trip point for MAX5035A/B/C/D 1.53 1.69 1.85
ON/OFF Input-Voltage Threshold V
ON/OFF
Rising trip point for MAX5035E 1.40 1.65 1.90
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
MAX5035D/E 95 %
VOLTAGE REGULATOR
Regulator Output Voltage VD V
IN
= 8.5V to 76V, I
L
= 0 6.9 7.8 8.8 V
Dropout Voltage 7.5V ≤ V
IN
≤ 8.5V, I
L
= 1mA 2.0 V
Load Regulation ∆VD/∆I
VD
0 to 5mA 150 Ω
PACKAGE THERMAL CHARACTERISTICS
SO package (JEDEC 51) 170
Thermal Resistance
(Junction to Ambient)
θ
JA
DIP package (JEDEC 51) 110
°C/W
THERMAL SHUTDOWN
Thermal-Shutdown Junction
Temperature
T
SH
+160 °C
Thermal-Shutdown Hysteresis T
HYST
20 °C
ELECTRICAL CHARACTERISTICS (MAX5035_A_ _)
(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 Application Circuit. ) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5035A 7.5 76.0
MAX5035B 7.5 76.0
MAX5035C 15 76
Input Voltage Range V
IN
MAX5035D/E 7.5 76.0
V
Undervoltage Lockout UVLO 5.2 V
MAX5035A
V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 1A
3.185 3.3 3.415
MAX5035B
V
IN
= 7.5V to 76V,
I
OUT
= 20mA to 1A
4.825 5.0 5.175
Output Voltage V
OUT
MAX5035C
V
IN
= 15V to 76V,
I
OUT
= 20mA to 1A
11.58 12 12.42
V
MAX5035
Maxim Integrated
3