MAX8554 MAXIM [Maxim Integrated Products], MAX8554 Datasheet - Page 7

• 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]

ELECTRICAL CHARACTERISTICS (continued)
(V
= LX = POK = GND, BST = VL, T
4.5V to 28V Input, Synchronous PWM Buck Controllers
Note 1: Consult factory for applications that require higher than 3.5V output.
Note 2: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX forced to 0V, BST
Note 3: Specifications to -40°C are guaranteed by design and are not production tested.
DRIVER
DH Gate-Driver On-Resistance
DL Gate-Driver On-Resistance
(Source)
DL Gate-Driver On-Resistance
(Sink)
FSEL LOGIC
Logic Input Current
Logic Low (GND)
Logic REF Level
Logic Float Level
Logic VL Level
EN/HSD OR EN LOGIC
EN/HSD or EN Shutdown Current
Logic High
Logic Low
POWER-OK OUTPUT
Upper VTT, and VTTR Threshold
Lower VTT, and VTTR Threshold
Upper Threshold
Lower Threshold
POK Output Low Level
POK Output High Leakage
V+
= V
for DDR Termination and Point-of-Load Applications
HSD
forced to 5V, and a 250pF capacitor connected from DH to LX. Actual in-circuit times may differ due to MOSFET switching
speeds.
PARAMETER
= +12V, V
_______________________________________________________________________________________
EN/HSD
= V
A
REFIN
= -40°C to +85°C, unless otherwise specified.) (Note 3)
V
DL high state
DL low state
FSEL = REF
FSEL unconnected
FSEL = VL
Max I
V
V
MAX8553
MAX8553
MAX8554
MAX8554
I
V
SINK
= +2.5V, V
BST
VL
VL
POK
= V
= V
- V
EN/HSD
= 2mA
= +5V
V+
V+
LX
= +4.5 to +5.5V, 100mV hysteresis
= +4.5 to +5.5V
= +5V
EN
for V
= +5V, C
EN/HSD
CONDITIONS
VL
< +0.8V or V
= 4.7µF, C
VTTR
EN
< +0.8V
= 1µF, C
REF
= 0.22µF, V
V
0.646
0.504
VL
1.65
3.15
MIN
0.5
1.5
55
43
-3
- 0.4
FSEL
= 0, ILIM = VL, PGND
0.698
0.552
MAX
1.25
2.35
3.85
2.5
3.0
0.5
3.0
0.8
0.4
+3
57
45
5
% V
% V
UNITS
µA
µA
µA
Ω
Ω
Ω
V
V
V
V
V
V
V
V
V
RE FIN
RE FIN
7