MAX8553(2003) 데이터 시트보기 (PDF) - Maxim Integrated
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MAX8553
(Rev.:2003)
(Rev.:2003)
Maxim Integrated
MAX8553 Datasheet PDF : 24 Pages
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4.5V to 28V Input, Synchronous PWM Buck Controllers
for DDR Termination and Point-of-Load Applications
ELECTRICAL CHARACTERISTICS (continued)
(VV+ = VHSD = +12V, VEN/HSD = VREFIN = +2.5V, VEN = +5V, CVL = 4.7µF, CVTTR = 1µF, CREF = 0.22µF, VFSEL = 0V, ILIM = VL,
PGND = LX = GND, BST = VL, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise specified.)
PARAMETER
FB Regulation Voltage
Output Adjust Range
VTT Line Regulation
FB Line Regulation
VTT Load Regulation
FB Load Regulation
CONDITIONS
MAX8554, VOUT = +2.5V, FSEL unconnected
MAX8554 (Note 1)
VEN/HSD ±10%, VVTT = +1.25V, IOUT = 0A
MAX8554, VHSD ±10%, VOUT = +2.5V,
IOUT = 0A, FSEL unconnected
0 < IOUT < +7A, VVTT = +1.25V
MAX8554, 0 < IOUT < +7A, VOUT = +2.5V,
FSEL unconnected
MIN
0.598
0.6
TYP
0.607
±0.325
MAX
0.616
3.5
UNITS
V
V
%
±0.325
%
0.2
%
0.2
%
REFERENCE
Reference Output Voltage
Reference Load Regulation
Reference UVLO
VTTR
VTTR Output Voltage Range
VTTR Output Accuracy
Thermal Shutdown
SOFT-START
VV+ = VVL = +4.5 to +5.5V, IREF = 0
1.97 2.00 2.03
V
VV+ = VVL = +5V, IREF = 0 to 50µA
10
mV
VV+ = VVL = +5V, reference rising, hysteresis = 27mV
1.5
1.6
1.7
V
IVTTR = -5mA to +5mA
IVTTR = -25mA to +25mA, VREFIN = +1.8V
IVTTR = -25mA to +25mA, VREFIN = +3.6V
Rising temperature, typical hysteresis = 15°C
0
1.8
V
49.5
50
50.5
49
50
51 % VREFIN
49.5
50
50.5
+160
°C
ILIM Ramp Period
Ramps the ILIM trip threshold from 20% to 100% in
20% increments
0.8
1.7
3.0
ms
Output Predischarge Period
Rising edge of EN/HSD to the start of internal digital
soft-start
0.8
1.7
3.0
ms
OSCILLATOR
Oscillator Frequency
On-Time
On-Time
Off-Time
FSEL = VL
FSEL = unconnected
FSEL = REF
FSEL = GND
MAX8553, VVTT = +1.25V
(Note 2)
MAX8554, VOUT = +2.5V
(Note 2)
(Note 2)
FSEL = VL
FSEL unconnected
FSEL = REF
FSEL = GND
FSEL = VL
FSEL unconnected
FSEL = REF
FSEL = GND
200
300
kHz
400
550
2.18
2.5
2.83
1.45 1.67 1.89
µs
1.09 1.25 1.41
0.82 0.91 1.00
0.89 1.02 1.16
0.61 0.71 0.80
µs
0.43 0.49 0.56
0.33 0.37 0.41
350 400
ns
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