MAX8969EWL50(2011) Просмотр технического описания (PDF) - Maxim Integrated
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MAX8969EWL50 Datasheet PDF : 15 Pages
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Step-Up Converter
for Handheld Applications
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 2.6V, TA = -40NC to +85NC, unless otherwise noted. Typical values are TA = +25NC.) (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Output Voltage Ripple
IOUT = 150mA, circuit of Figure 1
20
mVP-P
Soft-Start Interval
IOUT = 10mA, see the Output Capacitor
Selection section
Fs
TRACK MODE
pMOSFET On-Resistance
IOUT = 500mA, VIN = 2.7V
IOUT = 500mA, VIN = 3.2V
130
mI
110
Track Current Limit
VOUT = 3.6V
1
2
A
Track Mode Quiescent Current
EN = low, TREN = high
30
FA
AUTOMATIC TRACK MODE (ATM)
ATM Supply Current
VIN = 5.4V
65
FA
VOUT_TARGET = 3.3V
3.15
VOUT_TARGET = 3.5V
3.35
ATM VIN Rising Threshold (VATMRT)
VOUT_TARGET = 3.7V
3.55
V
VOUT_TARGET = 4.25V
4.04
VOUT_TARGET = 5V
4.74
VOUT_TARGET = 3.3V
3.10
VOUT_TARGET = 3.5V
3.29
ATM VIN Falling Threshold (VATMFT)
VOUT_TARGET = 3.7V
3.5
V
VOUT_TARGET = 4.25V
3.99
VOUT_TARGET = 5V
4.69
Boost to ATM Transition Time
(Note 7)
1
Fs
ATM to Boost Transition Time
1
Fs
LOGIC CONTROL
EN, TREN Logic Input High Voltage
EN, TREN Logic Input Low Voltage
EN, TREN Leakage Current
2.3V < VIN < 5.5V
2.3V < VIN < 5.5V
VEN = VTREN = 0V
TA = +25NC
TA = +85NC
1.05
V
0.4
V
-1
0.01 +1
FA
0.1
Note 3: Specifications are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by
design and characterization.
Note 4: Continuous operation with 1A at elevated ambient temperature and low voltage is not guaranteed. Under worst-case con-
ditions, die thermal protection cannot be activated after 100ms of 1A load application. See the continuous output current
parameter for a conservative estimate of current that can be maintained at TA = +85°C.
Note 5: Switching frequency decreases if input voltage is > 83% of the output voltage selected. This allows duty factor to drop to
values necessary to boost output voltage less than 25% without the use of pulse widths less than 60ns.
Note 6: Contact factory for other options.
Note 7: The output voltage regulation is a direct function of the peak current in the nMOS power switch. The inductor current (ILX)
described in the conditions of the steady-state output voltage specification corresponds to the peak inductor current.
Note 8: Once ATM threshold is reached boost switching stops in 1µs (typ), but the transition to ATM does not occur until VOUT has
fallen equal to VIN.
4 _______________________________________________________________________________________
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