M
Ultra-High Efficiency, Dual Step-Down
Controller for Notebook Computers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
V+ to AGND..............................................................-0.3 to +30V
V
DD
, V
CC
to AGND..................................................-0.3V to +6V
PGND to AGND or V
CC
to V
DD
...........................................±0.3V
PGOOD, OUT_ to AGND..........................................-0.3V to +6V
ILIM_, FB_, REF,
SKIP
, TON,
ON_ to AGND...........................................-0.3V to (V
DD
+ 0.3V)
DL_ to PGND..............................................-0.3V to (V
DD
+ 0.3V)
BST_ to AGND........................................................-0.3V to +36V
DH1 to LX1...............................................-0.3V to (BST1 + 0.3V)
DH2 to LX2...............................................-0.3V to (BST2 + 0.3V)
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.
LX1 to BST1..............................................................-6V to +0.3V
LX2 to BST2..............................................................-6V to +0.3V
REF Short Circuit to AGND.........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin QSOP (derate 8.0mW/°C above +70°C).....640mW/°C
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, 4A components from Table 1, V
CC =
V
DD
= +5V,
SKIP
= AGND, V+ = 15V,
T
A
= 0°C to +85°C
, unless otherwise
noted.) (Note 1)
CONDITIONS
PARAMETER
I
LOAD
= 0 to 4A, each output
V
CC
= 4.5V to 5.5V, V+ = 4.5V to 28V
Adjustable mode, each output
FB_ = AGND
%
%
0.4
0.2
FB2 = GND
Battery voltage, V+
V
DD,
V
CC
Input Voltage Range
V+ = 24V, OUT2 = 2V
Load Regulation Error
Line Regulation Error
V+ = 24V, OUT1 = 2V
Output 2 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
TON = GND
TON = REF
FB_ Input Bias Current
Soft-Start Ramp Time
TON = GND
TON = REF
TON = open
TON = V
DD
V
OUT
_ = AGND
Rising edge of ON_ to full current limit
210
300
247
353
280
407
V
142
173
205
ms
OUT_ Input Resistance
μA
2.475
2.5
2.525
V+ = 2V to 28V,
SKIP
= V
CC
, T
A
= +25°C
I
LOAD
= 0 to 4A
V+ = 2V to 28V,
SKIP
= V
CC
, T
A
= +25°C
I
LOAD
= 0 to 4A
ns
154
198
182
234
215
270
V
On-Time (PWM2)
ns
112
136
160
0.99
1.782
3.267
0.985
1.773
3.250
1.00
1.8
3.3
1.00
1.8
3.3
1.01
1.818
3.333
1.105
1.827
3.350
On-Time (PWM1)
V
1.7
0.99
1.00
1.01
-0.1
0.1
TON = open
TON = V
DD
292
420
336
484
380
550
75k
FB1 = V
CC
FB1 = OUT1
FB1 = AGND
FB1 = OUT1
2
28
5.5
FB2 = OUT2
V
1
5.5
Output Voltage Range
UNITS
MIN
TYP
MAX
Output 1 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
4.5
Output 1 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
V+ = 2V to 28V,
SKIP
= V
CC
, T
A
= 0°C to +85°C
I
LOAD
= 0 to 4A
V
FB1 = V
CC
FB1 = AGND
FB2 = GND
Output 2 Error Comparator
Threshold (DC Output Voltage
Accuracy) (Note 2)
2.463
2.5
2.538
V+ = 2V to 28V,
SKIP
= V
CC
, T
A
= 0°C to +85°C
I
LOAD
= 0 to 4A
V
0.985
1.00
1.105
FB2 = OUT2