MAX1958 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1958 Datasheet PDF : 24 Pages
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W-CDMA/N-CDMA Cellular Phone HBT PA
Management ICs
ELECTRICAL CHARACTERISTICS (STEP-DOWN CONVERTER) (continued)
(VINP = VIN = VVCC = V SHDN1 = 3.6V, VPWM = VPGND = VAGND = V SHDN2 = V SHDN3 = 0, VADJ = 1.25V, COMP = IN- = IN+ = AOUT
= TOUT = unconnected, CREF = 0.1µF, TA = 0°C to +85°C, VOUT for MAX1958 = 2.2V, VOUT for MAX1959 = 1.7V, unless otherwise
noted. Typical values are at TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Negative COMP Output Current
(MAX1958)
VADJ = 1V, VOUT = 2V, VCOMP = 1.25V
7
14
27
µA
Negative COMP Output Current
(MAX1959)
VADJ = 1V, VOUT = 1.4V, VCOMP = 1.25V
7
14
27
µA
REFERENCE
REF Output Voltage
REF Load Regulation
Undervoltage Lockout Threshold
Supply Rejection
CONTROLLER
P-Channel On-Resistance
N-Channel On-Resistance
Current-Sense Transresistance
10µA < IREF < 100µA
Rising or falling, 1% hysteresis
2.6V < VIN < 5.5V
ILX = 180mA, VIN = 3.6V
ILX = 180mA, VIN = 2.6V
ILX = 180mA, VIN = 3.6V
ILX = 180mA, VIN = 2.6V
1.225
0.85
1.250
2.50
1.00
0.07
1.275
6.25
1.10
1.7
V
mV
V
mV/V
0.21 0.40
Ω
0.25
0.5
0.18 0.30
Ω
0.21 0.35
0.5
V/A
P-Channel Current-Limit
Threshold
1.1
1.37
1.6
A
P-Channel Pulse-Skipping
Current Threshold
VPWM = 0
0.12 0.15 0.17
A
N-Channel Current-Limit
Threshold
VPWM = VIN
-0.5
A
N-Channel Zero-Crossing
Comparator
LX Leakage Current
LX RMS Current
Maximum Duty Cycle
Minimum Duty Cycle
Oscillator Frequency
Thermal-Shutdown Threshold
LOGIC INPUTS (PWM, SHDN1)
Logic Input High
Logic Input Low
Logic Input Current
VPWM = 0
VIN = 5.5V
(Note 1)
VPWM = 0
VPWM = VIN = 4.2V
Hysteresis = +15°C
2.6 V < VIN < 5.5 V
2.6 V < VIN < 5.5 V
VIN = 5.5V
-20.0
100
0.85
20
+0.1
+20.0
1.0
0
16
1.00 1.15
160
mA
µA
A
%
%
MHz
°C
1.6
V
0.6
V
0.1
1
µA
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