MAX8553 Maxim, MAX8553 Datasheet - Page 4

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

4.5V to 28V Input, Synchronous PWM Buck Controllers
for DDR Termination and Point-of-Load Applications
ELECTRICAL CHARACTERISTICS (continued)
(V
PGND = LX = GND, BST = VL, T
4
CURRENT LIMIT
Current-Limit Threshold (Positive
Direction)
Current-Limit Threshold (Negative
Direction)
ILIM Input Current
FAULT DETECTION
Overvoltage Threshold
VL REGULATOR
Output Voltage
Line Regulation
RMS Output Current
Bypass Capacitor
DRIVER
DH Gate-Driver On-Resistance
DL Gate-Driver On-Resistance
(Source)
DL Gate-Driver On-Resistance
(Sink)
Dead Time
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
V+
_______________________________________________________________________________________
= V
HSD
PARAMETER
= +12V, V
EN/HSD
= V
A
= 0°C to +85°C. Typical values are at T
REFIN
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
+6V < V
ESR < 100mΩ
V
DL high state
DL low state
DL rising
DL falling
FSEL = REF
FSEL unconnected
FSEL = VL
Max I
V
V
BST
VL
VL
= +2.5V, V
= V
= V
- V
EN/HSD
V+
V+
V+
V+
LX
= +4.5 to +5.5V, 100mV hysteresis
= +4.5 to +5.5V
= +5V
<+28V, 1mA < I
< +28V, I
REFIN
REFIN
for V
EN
ILIM
ILIM
= +5V, C
EN/HSD
> +1V)
≤ +1V)
= 100kΩ
= 400kΩ
CONDITIONS
VL
= 10mA
< +0.8V or V
VL
VL
< 35mA
= 4.7µF, C
A
= +25°C, unless otherwise specified.)
EN
VTTR
< +0.8V
= 1µF, C
REF
V
0.576
0.696
VL
-130
4.80
1.65
3.15
MIN
160
2.2
0.5
1.5
80
35
57
-3
= 0.22µF, V
- 0.4
0.600
0.720
TYP
-110
0.75
100
200
5.0
0.2
1.4
1.6
50
60
32
30
5
FSEL
0.624
0.744
MAX
= 0V, ILIM = VL,
5.33
1.25
2.35
3.85
115
230
-90
2.5
3.0
0.5
3.0
0.8
+3
65
63
35
% V
UNITS
mV
mA
µA
µA
µA
µF
ns
%
%
Ω
Ω
Ω
RE FIN
V
V
V
V
V
V
V
V