MAX1820 データシートの表示（PDF） - Maxim Integrated
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MAX1820 Datasheet PDF : 18 Pages
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WCDMA Cellular Phone 600mA
Buck Regulators
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
OUTPUT SWITCHING HARMONICS
vs. FREQUENCY
(VIN = 3.8V, VOUT = 3.4V, ILOAD = 600mA)
OUTPUT SWITCHING HARMONICS
vs. FREQUENCY
(VIN = 3.8V, VOUT = 1.8V, ILOAD = 300mA)
1.6
1.6
1.2
1.2
0.8
0.8
0.4
0.4
0
0.1
1
10
FREQUENCY (MHz)
OUTPUT SWITCHING HARMONICS
vs. FREQUENCY
(VIN = 4.2V, VOUT = 0.4V, ILOAD = 30mA)
1.6
0
0.1
1
10
FREQUENCY (MHz)
OUTPUT NOISE (VIN = 3.6V,
VOUT = 1.8V, IOUT = 300mA)
4.0
1.2
3.0
0.8
2.0
0.4
1.0
0
0.1
1
10
FREQUENCY (MHz)
0
0.1
1
10
FREQUENCY (MHz)
100 250
MAX1820
UCSP
PIN
MAX1820 MAX1821
µMAX
UCSP
MAX1821
µMAX
A1
1
A1
1
A2
2
A2
2
A3
3
—
—
NAME
SKIP
COMP
OUT
Pin Description
FUNCTION
PWM/Skip-Mode Input. Drive with logic 0 to use PWM at medium
and heavy loads and pulse skipping at light loads. Drive with
logic 1 to force PWM at all loads.
Compensation. Typically, connect an 82kΩ (for MAX1821) or
43kΩ (for MAX1820) series resistor and 330pF capacitor from
this pin to GND to stabilize the regulator.
Output Voltage Sense Input. Connect OUT directly to the output.
8 _______________________________________________________________________________________
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