MAX8554 MAXIM [Maxim Integrated Products], MAX8554 Datasheet - Page 6

• Manufacturer Part Number: MAX8554
• Description: 4.5V to 28V Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications
• Manufacturer: MAXIM [Maxim Integrated Products]

4.5V to 28V Input, Synchronous PWM Buck Controllers
for DDR Termination and Point-of-Load Applications
ELECTRICAL CHARACTERISTICS (continued)
(V
= LX = POK = GND, BST = VL, T
6
REFERENCE
Reference Output Voltage
Reference Load Regulation
Reference UVLO
VTTR
VTTR Output Voltage Range
VTTR Output Accuracy
SOFT-START
ILIM Ramp Period
Output Predischarge Period
OSCILLATOR
On-Time
On-Time
Off-Time
CURRENT LIMIT
Current-Limit Threshold (Positive
Direction)
Current-Limit Threshold (Negative
Direction)
ILIM Input Current
FAULT DETECTION
Overvoltage Threshold
VL REGULATOR
Output Voltage
RMS Output Current
Bypass Capacitor
V+
_______________________________________________________________________________________
= V
HSD
PARAMETER
= +12V, V
EN/HSD
= V
A
REFIN
= -40°C to +85°C, unless otherwise specified.) (Note 3)
V
V
V
I
I
I
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
MAX8553, V
(Note 2)
MAX8554, V
(Note 2)
(Note 2)
LX to PGND, ILIM = VL
LX to PGND, R
LX to PGND, R
LX to PGND, ILIM = VL, with respect to positive
current-limit threshold
MAX8553 (V
MAX8553 (V
MAX8554
+6V < V
ESR < 100mΩ
VTTR
VTTR
VTTR
= +2.5V, V
V+
V+
V+
= V
= V
= V
= -5mA to +5mA
= -25mA to +25mA, V
= -25mA to +25mA, V
VL
VL
VL
V+
= +4.5 to +5.5V, I
= +5V, I
= +5V, reference rising, hysteresis = 27mV
< +28V, 1mA < I
EN
VTT
OUT
REFIN
REFIN
= +5V, C
ILIM
ILIM
= +1.25V
= +2.5V
> +1V)
≤ +1V)
REF
= 100kΩ
= 400kΩ
CONDITIONS
= 0 to 50µA
VL
= 4.7µF, C
REFIN
REFIN
VL
REF
FSEL = VL
FSEL unconnected
FSEL = REF
FSEL = GND
FSEL = VL
FSEL unconnected
FSEL = REF
FSEL = GND
< 35mA
= 0
= +1.8V
= +3.6V
VTTR
= 1µF, C
REF
= 0.22µF, V
0.576
0.696
49.5
49.5
-130
MIN
1.97
2.18
1.45
1.09
0.82
0.89
0.61
0.43
0.33
4.80
150
1.5
0.8
0.8
2.2
49
80
30
57
0
FSEL
= 0, ILIM = VL, PGND
0.624
0.744
MAX
2.03
50.5
50.5
2.83
1.89
1.41
1.00
1.16
0.80
0.56
0.41
5.33
420
115
230
-90
1.7
1.8
3.0
3.0
10
51
65
63
35
% V
UNITS
mV
mV
mA
ms
ms
µA
µF
µs
µs
ns
%
%
V
V
V
V
V
RE FIN