MAX1623 Maxim, MAX1623 Datasheet - Page 4

• Manufacturer Part Number: MAX1623
• Description: 3A / Low-Voltage / Step-Down Regulator with Synchronous Rectification and Internal Switches
• Manufacturer: Maxim

3A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
(Circuit of Figure 2, T
4
__________________________________________Typical Operating Characteristics
100
_______________________________________________________________________________________
90
80
70
60
50
40
30
20
10
0
0.001
0.01
vs. OUTPUT CURRENT
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
V
350
300
250
200
150
100
50
OUT
OUTPUT CURRENT (A)
0
0
V
EFFICIENCY
OUT
0
0
= 1.1V, R
REFERENCE LOAD REGULATION ERROR
V
A
OUT
V
= 2.5V, R
OUT
= +25°C, unless otherwise noted.)
vs. REFERENCE LOAD CURRENT
0.1
= 1.1V, R
500
REFERENCE LOAD CURRENT ( A)
= 3.3V, R
TOFF
5
SWITCHING FREQUENCY
TOFF
vs. LOAD CURRENT
= 280k
1000
LOAD CURRENT (mA)
T
TOFF
A
TOFF
= 180k
= +85°C
1
10
= 280k
V
V
= 110k
OUT
1500
OUT
T
A
= +25°C
= 3.3V, R
= 2.5V, R
15
10
2000
TOFF
TOFF
T
A
20
= -40°C
2500
= 110k
= 180k
5
4
3
2
1
0
3000
25
0
100
OFF-TIME RESISTANCE
SWITCH OFF-TIME vs.
200
R
TOFF
300
(k )
400
500
-0.05
-0.10
-0.15
-0.20
-0.25
-0.30
-0.35
-0.40
-0.45
-0.50
400
350
300
250
200
150
100
50
0
0
0.001
600
4.5
V
V
R
OUT
IN
TOFF
V
LOAD REGULATION ERROR
= 5V, V
4.7
OUT
= 3.3V, R
SWITCHING FREQUENCY
1000
0.01
0.01
100
= 180k
0.1
vs. INPUT VOLTAGE
10
vs. LOAD CURRENT
= 2.5V, R
1
LOAD CURRENT (A)
INPUT VOLTAGE (V)
OUT
TOFF
0
4.9
= 2.5V,
TOFF
V
R
= 110k
0.1
IN
TOFF
1
= 5V, V
= 180k
5.1
= 110k
vs. INPUT VOLTAGE
SUPPLY CURRENT
INPUT VOLTAGE (V)
OUT
2
1
SHDN = IN
= 3.3V,
SHDN = GND
5.3
3
5.5
10
4
5
6