High-Speed Step-Down Controller
for Notebook Computers
MAX1714
ABSOLUTE MAXIMUM RATINGS
V+ to AGND (Note 1)..............................................-0.3V to +30V
LX to BST..................................................................-6V to +0.3V
V
DD
, V
CC
to AGND (Note 1) .....................................-0.3V to +6V
REF Short Circuit to AGND.........................................Continuous
PGND to AGND (Note 1) ................................................... ±0.3V
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW
SHDN,
PGOOD, OUT to AGND (Note 1)..................-0.3V to +6V
20-Pin QSOP (derate 9.1mW/°C above +70°C)..........727mW
ILIM, FB, REF,
SKIP,
Operating Temperature Range ..........................-40°C to +85°C
TON to AGND (Notes 1, 2)....................-0.3V to (V
CC
+ 0.3V)
DL to PGND (Note 1)..................................-0.3V to (V
DD
+ 0.3V)
Junction Temperature ......................................................+150°C
BST to AGND (Note 1) ...........................................-0.3V to + 36V
Storage Temperature Range ............................-65°C to +150°C
DH to LX.....................................................-0.3V to (BST + 0.3V)
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
For the MAX1714B, AGND and PGND refer to a single pin designated GND.
Note 2:
SKIP
may be forced below -0.3V, temporarily exceeding the absolute maximum rating, disabling over/undervoltage fault
detection for the purpose of debugging prototypes (Figure 6). Limit the current drawn to 5mA maximum.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(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)
PARAMETER
Input Voltage Range
Error Comparator Threshold
(DC Output Voltage Accuracy)
(Note 3)
Load Regulation Error
Line Regulation Error
FB Input Bias Current
OUT Input Resistance
Soft-Start Ramp Time
FB = AGND
Rising edge of
SHDN
to full I
LIM
TON = AGND (600kHz)
On-Time
V+ = 24V,
V
OUT
= 2V
(Note 4)
(Note 4)
FB forced above the regulation point
FB forced above the regulation point
V
SHDN
= 0
V
SHDN
= 0
V
SHDN
= 0 , V+ = 28V, V
CC
= V
DD
= 0 or 5V
V
CC
= 4.5V to 5.5V, no external REF load
I
REF
= 0 to 50µA
REF in regulation
Falling edge, hysteresis = 40mV
10
1.6
1.98
TON = REF (450kHz)
TON = unconnected (300kHz)
TON = V
CC
(200kHz)
Minimum Off-Time
Quiescent Supply Current (V
CC
)
Quiescent Supply Current (V
DD
)
Quiescent Supply Current (V+)
Shutdown Supply Current (V
CC
)
Shutdown Supply Current (V
DD
)
Shutdown Supply Current (V+)
Reference Voltage
Reference Load Regulation
REF Sink Current
REF Fault Lockout Voltage
140
175
260
380
Battery voltage, V+
V
CC,
V
DD
FB = OUT
V+ = 4.5V to 28V,
SKIP
= V
CC
I
LOAD
= 0 to 3A,
SKIP
= V
CC
V
CC
= 4.5V to 5.5V, V+ = 4.5V to 28V
-0.1
100
190
1.7
160
200
290
425
400
550
<1
25
<1
<1
<1
2
180
225
320
470
500
750
5
40
5
5
5
2.02
0.01
ns
µA
µA
µA
µA
µA
µA
V
V
µA
V
ns
FB = AGND
FB = V
CC
CONDITIONS
MIN
2
4.5
0.99
2.475
3.267
1.0
2.5
3.3
9
5
0.1
300
TYP
MAX
28
5.5
1.01
2.525
3.333
mV
mV
µA
kΩ
ms
V
UNITS
V
2
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
