MAX8553 Maxim, MAX8553 Datasheet - Page 3

• Manufacturer Part Number: MAX8553
• Description: 4.5V to 28V Input / Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(V
PGND = LX = GND, BST = VL, T
4.5V to 28V Input, Synchronous PWM Buck Controllers
FB Regulation Voltage
Output Adjust Range
VTT Line Regulation
FB Line Regulation
VTT Load Regulation
FB Load Regulation
REFERENCE
Reference Output Voltage
Reference Load Regulation
Reference UVLO
VTTR
VTTR Output Voltage Range
VTTR Output Accuracy
Thermal Shutdown
SOFT-START
ILIM Ramp Period
Output Predischarge Period
OSCILLATOR
Oscillator Frequency
On-Time
On-Time
Off-Time
V+
= V
for DDR Termination and Point-of-Load Applications
HSD
PARAMETER
= +12V, V
_______________________________________________________________________________________
EN/HSD
= V
A
= 0°C to +85°C. Typical values are at T
REFIN
MAX8554, V
MAX8554 (Note 1)
V
MAX8554, V
I
0 < I
MAX8554, 0 < I
FSEL unconnected
V
V
V
I
I
I
Rising temperature, typical hysteresis = 15°C
Ramps the ILIM trip threshold from 20% to 100% in
20% increments
Rising edge of EN/HSD to the start of internal digital
soft-start
FSEL = VL
FSEL = unconnected
FSEL = REF
FSEL = GND
MAX8553, V
(Note 2)
MAX8554, V
(Note 2)
(Note 2)
OUT
VTTR
VTTR
VTTR
EN/HSD
V+
V+
V+
= +2.5V, V
= V
= V
= V
OUT
= 0A, FSEL unconnected
= -5mA to +5mA
= -25mA to +25mA, V
= -25mA to +25mA, V
VL
VL
VL
±10%, V
< +7A, V
= +4.5 to +5.5V, I
= +5V, I
= +5V, reference rising, hysteresis = 27mV
OUT
HSD
VTT
OUT
EN
OUT
= +1.25V
= +2.5V, FSEL unconnected
±10%, V
= +2.5V
= +5V, C
VTT
VTT
REF
< +7A, V
CONDITIONS
= +1.25V, I
= +1.25V
= 0 to 50µA
OUT
VL
REFIN
REFIN
REF
OUT
= +2.5V,
= 4.7µF, C
FSEL = VL
FSEL unconnected
FSEL = REF
FSEL = GND
FSEL = VL
FSEL unconnected
FSEL = REF
FSEL = GND
= 0
OUT
= +2.5V,
= +1.8V
= +3.6V
A
= +25°C, unless otherwise specified.)
= 0A
VTTR
= 1µF, C
REF
0.598
MIN
1.97
49.5
49.5
2.18
1.45
1.09
0.82
0.89
0.61
0.43
0.33
0.6
1.5
0.8
0.8
49
= 0.22µF, V
0
±0.325
±0.325
0.607
+160
TYP
2.00
1.67
1.25
0.91
1.02
0.71
0.49
0.37
200
300
400
550
350
0.2
0.2
1.6
1.7
1.7
2.5
50
50
50
FSEL
0.616
= 0V, ILIM = VL,
MAX
2.03
50.5
50.5
2.83
1.89
1.41
1.00
1.16
0.80
0.56
0.41
400
3.5
1.7
1.8
3.0
3.0
10
51
% V
UNITS
kHz
mV
ms
ms
°C
µs
µs
ns
%
%
%
%
V
V
V
V
V
RE FIN
3