Datasheet

MAX1714
High-Speed Step-Down Controller
for Notebook Computers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, 4A components from Table 1, V+ = 15V, V
CC
= V
DD
= +5V, SKIP = AGND, T
A
= -40°C to +85°C, unless other-
wise noted.) (Notes 1, 5)
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, 4A components from Table 1, V+ = +15V, V
CC
= V
DD
= +5V, SKIP = AGND, T
A
= 0°C to +85°C, unless otherwise
noted.) (Note 1)
CONDITIONS
VV
CC
- 0.4TON V
CC
Level
V3.15 3.85TON Float Voltage
V1.65 2.35TON Reference Level
V0.5TON AGND Level
Forced to AGND or V
CC
µA-3 3TON Input Current
UNITSMIN TYP MAXPARAMETER
TON = V
CC
(200kHz)
Reference Voltage 1.98 2.02 VV
CC
= 4.5V to 5.5V, no external REF load
PARAMETER MIN TYP MAX UNITS
TON = unconnected (300kHz)
On-Time
140 180
ns
TON = AGND (600kHz)
Input Voltage Range
228
V
4.5 5.5
TON = REF (450kHz)
Error Comparator Threshold
(DC Output Voltage Accuracy)
(Note 3)
0.985 1.015
V
175 225
With respect to error comparator threshold
(MAX1714A only)
260 320
380 470
Minimum Off-Time
FB = AGND
500 ns
Quiescent Supply Current (V
CC
)
FB = OUT
750 µA
3.25 3.35
2.462 2.538
Logic Input Current -1 1 µA
SHDN, SKIP
Logic Input Low Voltage 0.8 V
SHDN, SKIP
Logic Input High Voltage
FB = V
DD
V
2.4 V
SHDN, SKIP
V
CC
Undervoltage Lockout
Threshold
4.1 4.4
Rising edge, hysteresis = 20mV, PWM disabled below
this level
Output Undervoltage
Protection Threshold
65 75
CONDITIONS
%
160 240
With respect to error comparator threshold
V
ILIM
= 2.0V
V
ILIM
= 0.5V
Current-Limit Threshold
(Positive Direction, Adjustable)
35 65
V+ = 24V,
V
OUT
= 2V
(Note 4)
(Note 4)
mV
Overvoltage Trip Threshold
FB forced above the regulation point
PGND - LX
Current-Limit Threshold (Positive
Direction, Fixed)
Battery voltage, V+
85 115
V
CC,
V
DD
mVPGND - LX, ILIM = V
CC
V+ = 4.5V to 28V,
SKIP = V
CC
10 15 %