MAX8553 데이터 시트보기 (PDF) - Maxim Integrated
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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 = 0, ILIM = VL, PGND
= LX = POK = GND, BST = VL, TA = -40°C to +85°C, unless otherwise specified.) (Note 3)
PARAMETER
CONDITIONS
MIN
MAX UNITS
REFERENCE
Reference Output Voltage
VV+ = VVL = +4.5 to +5.5V, IREF = 0
1.97
2.03
V
Reference Load Regulation
Reference UVLO
VV+ = VVL = +5V, IREF = 0 to 50µA
VV+ = VVL = +5V, reference rising, hysteresis = 27mV
1.5
10
mV
1.7
V
VTTR
VTTR Output Voltage Range
0
1.8
V
VTTR Output Accuracy
IVTTR = -5mA to +5mA
IVTTR = -25mA to +25mA, VREFIN = +1.8V
IVTTR = -25mA to +25mA, VREFIN = +3.6V
49.5
49
49.5
50.5
51
50.5
% VREFIN
SOFT-START
ILIM Ramp Period
Ramps the ILIM trip threshold from 20% to 100% in
0.8
20% increments
3.0
ms
Output Predischarge Period
Rising edge of EN/HSD to the start of internal digital
0.8
soft-start
3.0
ms
OSCILLATOR
On-Time
On-Time
Off-Time
CURRENT LIMIT
Current-Limit Threshold (Positive
Direction)
Current-Limit Threshold (Negative
Direction)
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
LX to PGND, ILIM = VL
LX to PGND, RILIM = 100kΩ
LX to PGND, RILIM = 400kΩ
LX to PGND, ILIM = VL, with respect to positive
current-limit threshold
2.18
1.45
1.09
0.82
0.89
0.61
0.43
0.33
80
30
150
-130
2.83
1.89
µs
1.41
1.00
1.16
0.80
µs
0.56
0.41
420
ns
115
65
mV
230
-90
%
ILIM Input Current
FAULT DETECTION
Overvoltage Threshold
VL REGULATOR
Output Voltage
RMS Output Current
Bypass Capacitor
MAX8553 (VREFIN > +1V)
MAX8553 (VREFIN ≤ +1V)
MAX8554
+6V < VV+ < +28V, 1mA < IVL < 35mA
ESR < 100mΩ
57
0.576
0.696
4.80
2.2
µA
63
%
0.624
V
0.744
5.33
V
35
mA
µF
6 _______________________________________________________________________________________
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