MAX8553(2003) Просмотр технического описания (PDF) - Maxim Integrated
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Компоненты Описание
производитель
MAX8553
(Rev.:2003)
(Rev.:2003)
Maxim Integrated
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 = 0V, ILIM = VL,
PGND = LX = GND, BST = VL, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise specified.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
POWER-OK OUTPUT
Upper VTT and VTTR Threshold
Lower VTT and VTTR Threshold
Upper Threshold
MAX8553
MAX8553
MAX8554
55
43
0.646
56
44
0.672
57
45
0.698
% VREFIN
% VREFIN
V
Lower Threshold
MAX8554
0.504 0.528 0.552
V
POK Output Low Level
POK Output High Leakage
ISINK = 2mA
VPOK = +5V
0.4
V
5
µA
ELECTRICAL CHARACTERISTICS
(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
V+ Input Voltage Range
VL not connected to V+
6
28
V
V+ Input Voltage Range
VL connected to V+
4.5
5.5
V
EN/HSD Input Voltage Range
MAX8553 enabled
1.5
28.0
V
EN Input Voltage Range
MAX8554 enabled
1.5
28.0
V
EN Input Current
3
µA
HSD Input Voltage Range
MAX8554 enabled
1.5
28.0
V
HSD Input Current
40
µA
REFIN Input Voltage Range
0
3.6
V
V+ Supply Current (MAX8553)
V+ Supply Current (MAX8554)
REFIN Supply Current
VVTT = +1.35V
VFB = 630mV
1.2
mA
0.90
mA
250
µA
EN/HSD Supply Current
10
µA
VL Supply Current
V+ Shutdown Supply Current
VVL = VV+ = 5.5V, VVTT = +1.35V
EN/HSD = GND
1.2
mA
5
µA
REFIN Shutdown Supply Current
EN/HSD = GND
1
µA
VL Shutdown Supply Current
VVL = VV+ = +5.5V, VEN/HSD = 0V
VL Undervoltage-Lockout Threshold Rising edge, typical hysteresis = 40mV
12
µA
4.05
4.40
V
VTT
VTT Input Bias Current
VTT Feedback Voltage Range
VVTT = +1.25V
-0.2
0
µA
0
1.8
V
VTT Feedback Voltage Accuracy
FB Input Bias Current
FB Regulation Voltage
Output Adjust Range
VREFIN = VEN/HSD = +1.8V
VREFIN = VEN/HSD = +3.6V
MAX8554, VFB = +600mV
MAX8554, VOUT = +2.5V, FSEL unconnected
MAX8554 (Note 1)
49.5
49.5
-0.2
0.598
0.6
50.5
50.5
0
0.616
3.5
% VREFIN
µA
V
V
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