Datasheet

1A, 76V, High-Efficiency MAXPower
Step-Down DC-DC Converter
ELECTRICAL CHARACTERISTICS (MAX5035_A_ _) (continued)
(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
V
IN
= 7.5V to 76V, MAX5035D
1.192 1.221 1.250
Feedback Voltage V
FB
V
IN
= 7.5V to 76V, MAX5035E
1.185 1.221 1.250
V
V
IN
= 12V, I
LOAD
= 0.5A, MAX5035A 86
V
IN
= 12V, I
LOAD
= 0.5A, MAX5035B 90
V
IN
= 24V, I
LOAD
= 0.5A, MAX5035C 94
Efficiency η
V
IN
= 12V, V
OUT
= 5V, I
LOAD
= 0.5A,
MAX5035D/E
90
%
V
FB
= 3.5V, V
IN
= 7.5V to 76V, MAX5035A
270
440
V
FB
= 5.5V, V
IN
= 7.5V to 76V, MAX5035B
270
440
V
FB
= 13V, V
IN
= 15V to 76V, MAX5035C
270
440
V
FB
= 1.3V, MAX5035D
270
440
Quiescent Supply Current I
Q
V
FB
= 1.3V, MAX5035E
340
460
µA
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)
1.30
1.9
2.50
A
V
IN
= 76V, V
ON/OFF
= 0V, V
LX
= 0V 1
Switch Leakage Current I
OL
V
IN
= 76V, V
ON/OFF
= 0V, V
LX
= 0V,
MAX5035E
5
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
1.50 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
105 125
137 kHz
Maximum Duty Cycle D
MAX
MAX5035D/E 95 %
VOLTAGE REGULATOR
Regulator Output Voltage VD V
IN
= 8.5V to 76V, I
L
= 0 6.5 7.8 9.0 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
MAX5035
4
Maxim Integrated