MAX724 데이터 시트보기 (PDF) - Maxim Integrated
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MAX724 Datasheet PDF : 13 Pages
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5A/2A Step-Down, PWM,
Switch-Mode DC-DC Regulators
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 25V, Tj = TMIN to TMAX, unless otherwise noted.)
PARAMETER
Error-Amplifier Voltage Gain
Error-Amplifier Transconductance
Error-Amplifier Source Current
Error-Amplifier Sink Current
Feedback Pin Bias Current
Reference Voltage
Reference Voltage Tolerance
1V ≤ VC ≤ 4V
CONDITIONS
VFB = 2V
VFB = 2.5V
VFB = VREF
VC = 2V
VREF (nominal) = 2.21V
Tj = +25°C
Tj = +25°C
Tj = +25°C
Tj = +25°C
Tj = +25°C
All conditions of input voltage, output voltage,
temperature and load current
MIN TYP MAX
2000
3000 5000 9000
100 140 225
0.6 1.0 1.7
0.5 2
2.155 2.210 2.265
±0.5 ±1.5
UNITS
V/V
µmho
µA
mA
µA
V
%
±1.0 ±2.5
Reference Voltage Line Regulation
VC Voltage at 0% Duty Cycle
Thermal Resistance,
Junction to Case (Note 6)
8V ≤ VIN ≤ 40V
MAX724
MAX726
Tj = +25°C
Tj = TMIN to TMAX
0.005 0.02
1.5
-4
2.5
4.0
%/V
V
mV/°C
°C/W
Note 1: Do not exceed switch-to-input voltage limitation.
Note 2: For switch currents between 1A and 5A (2A for MAX726), maximum switch-on voltage can be calculated via linear
interpolation.
Note 3: By setting the feedback pin (FB) to 2.5V, the VC pin is forced to its low clamp level and the switch duty cycle is forced to
zero, approximating the zero load condition.
Note 4: For proper regulation, total voltage from VIN to GND must be ≥ 8V after start-up.
Note 5: To avoid extremely short switch-on times, the switch frequency is internally scaled down when VFB is less than 1.3V. Switch-
current limit is tested with VFB adjusted to give a 1µs minimum switch-on time.
Note 6: Guaranteed, not production tested.
__________________________________________Typical Operating Characteristics
MAX724
STEP-DOWN CONVERTER EFFICIENCY
vs. OUTPUT CURRENT
110
CIRCUIT OF FIGURE 2
100
VOUT = 12V, VIN = 20V
90
80
70
VOUT = 5V, VIN = 15V
60
50
0
1
2
34
5
6
OUTPUT CURRENT (A)
SUPPLY CURRENT
vs. JUNCTION TEMPERATURE
16
14
CIRCUIT OF FIGURE 2
12
VIN = 25V, VOUT = 5V
10
IOUT = 1mA
8
6
4
2
0
-40 -25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
20
18
16
14
12
10
8
6
4
2
0
0
QUIESCENT SUPPLY CURRENT
vs. INPUT VOLTAGE
DEVICE NOT SWITCHING
VC = 1V
10
20
30
40
VIN INPUT VOLTAGE (V)
_______________________________________________________________________________________ 3
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