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.)
MAX1821 EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
100
90
80
VIN = 3.6V
70
60
VIN = 5.0V
VIN = 3.6V
50
40
VIN = 5.0V
30
20
10
0
1
SKIP = GND (DASHED LINE)
SKIP = BATT (SOLID LINE)
10
100
1000
LOAD CURRENT (mA)
DROPOUT VOLTAGE vs. LOAD CURRENT
140
120
100
80
60
40
20
0
0
VOUT = 3.4V
RL = 57mΩ
100 200 300 400 500 600
LOAD CURRENT (mA)
HEAVY-LOAD SWITCHING WAVEFORMS
(VIN = 3.8V, VOUT = 3.4V,
ILOAD = 600mA, SKIP = BATT)
MAX1820/21 toc10
A
B
C
Typical Operating Characteristics (continued)
MAX1821 EFFICIENCY vs. LOAD CURRENT
(VOUT = 2.5V)
100
90
80
70
60
50
40
30
20
10
0
1
VIN = 2.7V
VIN = 3.6V
VIN = 5.0V
VIN = 2.7V
VIN = 3.6V
VIN = 5.0V
SKIP = GND (DASHED LINE)
SKIP = BATT (SOLID LINE)
10
100
1000
LOAD CURRENT (mA)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
9
8
7
6
5
4
3
2
1
VOUT = 1.5V
SKIP = BATT
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
MEDIUM-LOAD SWITCHING WAVEFORMS
(VIN = 3.8V, VOUT = 1.8V,
ILOAD = 300mA, SKIP = BATT)
MAX1820/21 toc11
A
B
C
MAX1821 EFFICIENCY vs. LOAD CURRENT
(VOUT = 1.5V)
100
90
80
70
60
50
40
30
20
10
0
1
VIN = 2.7V
VIN = 3.6V
VIN = 5.0V
SKIP = GND (DASHED LINE)
SKIP = BATT (SOLID LINE)
10
100
1000
LOAD CURRENT (mA)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
220
200
180
160
140
120
100
80
60
40
VOUT = 1.5V
SKIP = GND
20
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
LIGHT-LOAD PWM SWITCHING WAVEFORMS
(VIN = 3.8V, VOUT = 0.45V,
ILOAD = 30mA, SKIP = BATT)
MAX1820/21 toc12
A
B
C
400ns/div
400ns/div
400ns/div
A: VLX, 5V/div
B: INDUCTOR CURRENT, 500mA/div
C: VOUT (AC-COUPLED), 5mV/div
A: VLX, 5V/div
B: INDUCTOR CURRENT, 500mA/div
C: VOUT (AC-COUPLED), 5mV/div
A: VLX, 5V/div
B: INDUCTOR CURRENT, 100mA/div
C: VOUT (AC-COUPLED), 5mV/div
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