Rainbow Electronics MAX1623 - Manual (Page 4)

MAX1623
3A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(Circuit of Figure 2, T A = +25°C, unless otherwise noted.)
100
0
0.001 0.1 1 0.01 10
EFFICIENCY
vs. OUTPUT CURRENT
20
MAX1623 TOC01
OUTPUT CURRENT (A)
EFFICIENCY (%)
40
60
80
90
10
30
50
70 V OUT = 3.3V, R TOFF = 110k Ω
V OUT = 1.1V, R TOFF = 280k Ω
V OUT = 2.5V, R TOFF = 180k Ω
0
1
3
2
4
5
0 200 100 300 400 500 600
SWITCH OFF-TIME
vs. OFF-TIME RESISTANCE
MAX1623 TOC02
R TOFF (k Ω)
t OFF
(µ
s)
1000
100
10
1
0.1
0.01
0 1 2 3 4 5 6
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1623 TOC03
INPUT VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
SHDN = IN
SHDN = GND
0
150
50
100
250
200
350
300
0 1000 1500 500 2000 2500 3000
SWITCHING FREQUENCY
vs. LOAD CURRENT
MAX1623 TOC04
LOAD CURRENT (mA)
SWITCHING FREQUENCY (kHz)
V OUT = 2.5V, R TOFF = 180k Ω
V OUT = 3.3V, R TOFF = 110k Ω
V
OUT
= 1.1V, R
TOFF
= 280k Ω
0
200
150
100
50
300
250
350
400
4.5 4.9 4.7 5.1 5.3 5.5
SWITCHING FREQUENCY
vs. INPUT VOLTAGE
MAX1623 TOC05
INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
V IN = 5V, V OUT = 3.3V,
R TOFF = 110k Ω
V
IN
= 5V, V
OUT
= 2.5V,
R TOFF = 180k Ω
0
-0.50
0.1 0.01 1 0.001 10
LOAD REGULATION ERROR
vs. LOAD CURRENT
-0.40
MAX1623 TOC07
LOAD CURRENT (A)
LOAD REGULATION ERROR (%)
-0.30
-0.20
-0.10
-0.35
-0.45
-0.25
-0.15
-0.05
V OUT = 2.5V, R TOFF = 180k Ω
V OUT = 3.3V, R TOFF = 110k Ω
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
0
0 5 10 15 20 25
REFERENCE LOAD REGULATION ERROR
vs. REFERENCE LOAD CURRENT
MAX1623 TOC06
REFERENCE LOAD CURRENT ( µA)
REFERENCE LOAD REGULATION ERROR (%)
T A = +25°C
T A = -40°C
T A = +85°C