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
ELECTRICAL CHARACTERISTICS (continued)
(VBATT = 3.6V, SHDN = BATT, SKIP = SYNC = GND, VREF = 1.25V (MAX1820 only), TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.) (Note 2)
PARAMETER
CONTROLLER
P-Channel On-Resistance
N-Channel On-Resistance
Current-Sense Transresistance
P-Channel Current-Limit
Threshold
SYMBOL
CONDITIONS
PRDS
NRDS
RCS
ILX = 180mA, VBATT = 3.6V
ILX = 180mA, VBATT = 2.6V
ILX = 180mA, VBATT = 3.6V
ILX = 180mA, VBATT = 2.6V
Duty factor = 100%
MIN TYP MAX UNITS
0.15
0.3
Ω
0.2
0.2 0.35
Ω
0.3
0.25 0.50 0.75
V/A
0.75
1.2
1.55
A
P-Channel Pulse-Skipping
Current Threshold
N-Channel Current-Limit
Threshold
LX Leakage Current
Maximum Duty Cycle
Minimum Duty Cycle
SYNC AND OSCILLATOR
SYNC Divide Ratio
(MAX1820X)
SYNC Capture Range
(MAX1820X)
SYNC Leakage Current
Frequency
SYNC Divide Ratio
(MAX1820Y)
SYNC Capture Range
(MAX1820Y)
Internal Oscillator Frequency
(MAX1820Z, MAX1821)
LOGIC INPUTS (SKIP, SHDN)
Logic Input High
Logic Input Low
Logic Input Current
SKIP = GND
ILX
dutyMAX
dutyMIN
SKIP = BATT
SKIP = GND
VBATT = 5.5V, LX = GND or BATT
SKIP = GND
SKIP = BATT, VBATT = 4.2VP-P
ISYNC
fOSC
SYNC = sine wave, SYNC input = 200mVP-P
SYNC = sine wave, SYNC input = 800mVP-P
SYNC = sine wave, AC-coupled,
SYNC input = 500mVP-P
VSYNC = 1V (MAX1820Z, MAX1821)
VSYNC = 1V (MAX1820X, MAX1820Y, and
MAX1821X)
SYNC = sine wave, SYNC input = 200mVP-P
SYNC = sine wave, SYNC input = 800mVP-P
SYNC = sine wave, AC-coupled,
SYNC input = 500mVP-P
SYNC = GND
VIH
VIL
0.04 0.13 0.24
A
-1.6 -0.85 -0.45
A
0.02 0.08 0.14
-1
0.1
1
µA
100
%
0
%
10
13
13
Hz/Hz
13
13
10
13
16
MHz
-1
+1
µA
-5
+5
18
18
Hz/Hz
18
18
15
19.8
21
MHz
0.8
1
1.2
MHz
1.6
V
0.4
V
-1
0.1
1
µA
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