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| MAX1549ETL Datasheet, PDF (3/35 Pages) Maxim Integrated Products – Dual, Interleaved, Fixed-Frequency Step-Down Controller with a Dynamically Adjustable Output | |||
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Dual, Interleaved, Fixed-Frequency Step-Down
Controller with a Dynamically Adjustable Output
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, VCC = VDD = 5V, SKIP = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
OUT_ Discharge-Mode
On-Resistance
OUT_ Synchronous-Rectifier
Discharge-Mode Turn-On Level
Operating Frequency
Minimum On-Time
Maximum Duty Cycle
Soft-Start Ramp Time
REFERENCE (REF)
Reference Voltage
Reference Load Regulation
REF Lockout Voltage
REFIN Voltage Range
REFIN Input Bias Current
FAULT DETECTION
Output Overvoltage
Trip Threshold
Output Overvoltage
Fault-Propagation Delay
Output Undervoltage-Protection
Trip Threshold
Output Undervoltage-Protection
Blanking Time
Output Undervoltage
Fault-Propagation Delay
PGOOD_ Lower Trip Threshold
PGOOD_ Upper Trip Threshold
PGOOD_ Propagation Delay
PGOOD_ Output Low Voltage
PGOOD_ Leakage Current
SYMBOL
RDISCHARGE
CONDITIONS
fOSC
tON(MIN)
DMAX
tSS
(Note 2)
(Note 3)
FSEL = GND
FSEL = REF
FSEL = open
FSEL = VCC
Measured from the rising edge of ON_ to
full scale
VREF
VCC = 4.5V to
5.5V, IREF = 0
TA = +25°C
TA = 0°C to +85°C
âVREF IREF = -10µA to +100µA
VREF(UVLO) Rising edge, hysteresis = 350mV
VREFIN
IREFIN
tOVP
With respect to error-comparator threshold
OUT1 and FB2 forced 2% above trip
threshold
With respect to error-comparator threshold
tBLANK From rising edge of ON_
tUVP
tPGOOD_
IPGOOD_
With respect to error-comparator threshold,
hysteresis = 1%
With respect to error-comparator threshold,
hysteresis = 1%
OUT1 and FB2 forced 2% beyond PGOOD_
trip threshold
ISINK = 4mA
OUT1 = REFIN and VFB2 = 0.5V (PGOOD_
high impedance), PGOOD_ forced to 5.5V
MIN
0.2
70
170
270
350
91
1.988
1.985
1.980
0.5
-50
12
65
-12.5
+7.5
TYP
12
0.3
100
200
300
400
93
512 /
fOSC
2.00
2.00
1.95
14.5
10
70
4096 /
fOSC
10
-10
+10
10
MAX
40
0.4
130
230
330
450
200
2.012
2.015
2.020
2.0
+50
17
75
-7.5
+12.5
0.3
1
UNITS
â¦
V
kHz
ns
%
s
V
V
V
V
nA
%
µs
%
s
µs
%
%
µs
V
µA
_______________________________________________________________________________________ 3
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