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
(VBATT = 3.6V, SHDN = BATT, SKIP = SYNC = GND, VREF = 1.25V (MAX1820 only), TA = -40°C to +85°C, unless otherwise noted.)
(Notes 2, 3)
PARAMETER
Input BATT Voltage
Undervoltage Lockout
Threshold
Quiescent Current
Quiescent Current in Dropout
Shutdown Supply Current
ERROR AMPLIFIER
OUT Voltage Accuracy
(MAX1820)
OUT Input Resistance
(MAX1820)
REF Input Current (MAX1820)
FB Voltage Accuracy
(MAX1821)
SYMBOL
CONDITIONS
MIN
VIN
2.6
VUVLO VBATT rising, 1% hysteresis
2.15
IQ
ISHDN
SKIP = GND (MAX1820Z, MAX1821)
SKIP = GND (MAX1820X, MAX1820Y, and
MAX1821X)
SKIP = BATT, no switching
SKIP = GND
SKIP = BATT, no switching
SHDN = GND
VOUT
ROUT
IREF
VFB
VREF = 1.932 ±0.005V, load = 0 to 600mA,
SKIP = BATT or GND
3.33
VREF = 0.227 ±0.005V, load = 0 to 30mA,
SKIP = BATT, VBATT ≤ 4.2V
0.35
250
FB = COMP
1.225
MAX
5.5
2.55
300
360
2000
1000
1000
6
UNITS
V
V
µA
µA
µA
3.47
V
0.45
kΩ
1
µA
1.275
V
FB Input Current (MAX1821)
Transconductance
COMP Clamp Low Voltage
COMP Clamp High Voltage
CONTROLLER
P-Channel On-Resistance
N-Channel On-Resistance
Current-Sense Transresistance
P-Channel Current-Limit
Threshold
P-Channel Pulse-Skipping
Current Threshold
N-Channel Current-Limit
Threshold
IFB
VFB = 1.4V
gm
PRDS
NRDS
RCS
ILX = 180mA, VBATT = 3.6V
ILX = 180mA, VBATT = 3.6V
Duty factor = 100%
SKIP = GND
SKIP = BATT
SKIP = GND
50
nA
30
85
µS
0.2
1.0
V
2.04
2.28
V
0.3
Ω
0.35
Ω
0.25
0.75
V/A
0.75
1.55
A
0.04
0.24
A
-1.6
-0.45
A
0.01
0.14
4 _______________________________________________________________________________________
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