MAX1714(1999) Просмотр технического описания (PDF) - Maxim Integrated
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MAX1714 Datasheet PDF : 24 Pages
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High-Speed Step-Down Controller
for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, 4A components from Table 1, V+ = +15V, VCC = VDD = +5V, SKIP = AGND, TA = 0°C to +85°C, unless otherwise
noted.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
TON VCC Level
VCC - 0.4
V
TON Float Voltage
3.15
3.85
V
TON Reference Level
1.65
2.35
V
TON AGND Level
0.5
V
TON Input Current
Forced to AGND or VCC
-3
3
µA
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, 4A components from Table 1, V+ = 15V, VCC = VDD = +5V, SKIP = AGND, TA = -40°C to +85°C, unless other-
wise noted.) (Notes 1, 5)
PARAMETER
Input Voltage Range
Error Comparator Threshold
(DC Output Voltage Accuracy)
(Note 3)
On-Time
Minimum Off-Time
Quiescent Supply Current (VCC)
Reference Voltage
Overvoltage Trip Threshold
CONDITIONS
Battery voltage, V+
VCC, VDD
V+ = 4.5V to 28V,
SKIP = VCC
FB = OUT
FB = AGND
FB = VDD
V+ = 24V,
VOUT = 2V
(Note 4)
(Note 4)
TON = AGND (600kHz)
TON = REF (450kHz)
TON = unconnected (300kHz)
TON = VCC (200kHz)
FB forced above the regulation point
VCC = 4.5V to 5.5V, no external REF load
With respect to error comparator threshold
(MAX1714A only)
MIN TYP MAX UNITS
2
28
V
4.5
5.5
0.985
1.015
2.462
2.538
V
3.25
3.35
140
180
175
225
ns
260
320
380
470
500
ns
750
µA
1.98
2.02
V
10
15
%
Output Undervoltage
Protection Threshold
With respect to error comparator threshold
65
75
%
Current-Limit Threshold (Positive
Direction, Fixed)
PGND - LX, ILIM = VCC
85
Current-Limit Threshold
(Positive Direction, Adjustable)
PGND - LX
VILIM = 0.5V
VILIM = 2.0V
35
160
VCC Undervoltage Lockout
Threshold
Rising edge, hysteresis = 20mV, PWM disabled below
this level
4.1
Logic Input High Voltage
SHDN, SKIP
2.4
Logic Input Low Voltage
SHDN, SKIP
Logic Input Current
SHDN, SKIP
-1
115
mV
65
mV
240
4.4
V
V
0.8
V
1
µA
4 _______________________________________________________________________________________
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