Rainbow Electronics MAX8508 - Manual (Page 3)

MAX8506/MAX8507/MAX8508
PWM Step-Down DC-DC Converters with 75m Ω
Bypass FET for WCDMA and cdmaOne Handsets
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PARAMETER CONDITIONS MIN TYP MAX UNITS
P-Channel Current-Limit
Threshold
1.00 1.25 1.50 A
SKIP = BATT (PWM mode) -0.6 -0.45 -0.30 N-Channel Current-Limit
Threshold
SKIP = GND (normal mode) 0.03 0.05 0.07
A
P-Channel Pulse-Skipping
Current Threshold
SKIP = GND (normal mode) 0.050 0.125 0.170 A
HP/Bypass P-Channel
Current-Limit Threshold
V OUT = 3.1V 0.8 1.5 2.5 A
LX Leakage Current -2 0.01 +2 µA
OUT Leakage Current -2 0.01 +2 µA
Maximum Duty Cycle 100 %
SKIP = GND (normal mode) 0
Minimum Duty Cycle
SKIP = BATT 12
%
COMP Clamp Low Voltage 0.8 V
COMP Clamp High Voltage 2.0 V
MAX8506 85 150 215
MAX8507 75 130 188 Transconductance
MAX8508 150 260 376
µS
Current-Sense Transresistance 0.36 0.48 0.60 V/A
OSCILLATOR
Internal Oscillator Frequency 0.8 1 1.2 MHz
LOGIC INPUTS ( SHDN , HP, SKIP )
Logic-Input High Voltage V BATT = 2.6V to 5.5V 1.6 V
Logic-Input Low Voltage V BATT = 2.6V to 5.5V 0.4 V
Logic Input Current 0.1 1 µA
THERMAL SHUTDOWN
Thermal-Shutdown Temperature +160 °C
Thermal-Shutdown Hysteresis 15 °C
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= V
BATTP
= 3.6V, SHDN = SKIP = BATT, HP = GND, V
REFIN
= 1.932V (MAX8506), V
REFIN
= 1.70V (MAX8507),
C REF = 0.22µF, T A = -40°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)
Note 2: Specifications to -40°C are guaranteed by design, not production tested.