M
Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
V
CC
, V
DD
, LX,
SHDN
to GND...................................-0.3V to +4V
MODE, IC to GND ....................................................-0.3V to +4V
COMP, FB, REF, REFIN, REFOUT, PGOOD
to GND.........................................................-0.3V to (V
CC
+ 0.3V)
FBSEL0, FBSEL1, TOFF,
SKIP
, SS to GND....-0.3V to (V
CC
+ 0.3V)
V
DD
to V
CC
...........................................................-0.3V to + 0.3V
IN to V
DD
....................................................-0.3V to (V
DD
+ 0.3V)
PGND to GND ...................................................... -0.3V to +0.3V
LX to BST................................................................. -4V to +0.3V
BST to GND.......................................................... -0.3V to +8.0V
Note 1:
LX has clamp diodes to PGND and IN. If continuous current is applied through these diodes, thermal limits must be observed.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
IN
= +3.3V, V
CC
= V
DD
=
SHDN
= MODE = +3.3V, V
REFIN
= V
REF
,
SKIP
= GND,
T
A
= 0°C to +85°C
, unless oth-
erwise noted. Typical values are at T
A
= +25°C.)
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.
LX Current (Note 1).............................................................±4.7A
REF Short Circuit to GND...........................................Continuous
REFOUT Short Circuit to GND....................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
24-Pin Thin QFN (derate 20.8mW/°C above +70°C;
part mounted on 1in
2
of 1oz copper)........................1667mW
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
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
PWM CONTROLLER
V
IN
1.3
3.0
0.5
3.6
3.6
2.7
Input Voltage Range
V
CC
, V
DD
V
Output Adjust Range
V
OUT
≤
V
IN
V
T
A
= +25°C
to +85°C
-3
0
+3
V
FB
-
V
REFIN
V
IN
= +3.3V, I
LOAD
= 0,
MODE = V
CC
T
A
= 0°C to
+85°C
-4
0
+4
mV
T
A
= +25°C
to +85°C
2.463
2.5
2.537
FBSEL0 = V
CC
,
FBSEL1 = V
CC
,
REFIN = REF
T
A
= 0°C to
+85°C
2.450
2.5
2.550
T
A
= +25°C
to +85°C
1.782
1.800
1.827
FBSEL0 = V
CC
,
FBSEL1 = GND,
REFIN = REF
T
A
= 0°C to
+85°C
1.773
1.800
1.836
T
A
= +25°C
to +85°C
1.477
1.500
1.523
FBSEL0=GND
FBSEL1=V
CC
REFIN=REF
T
A
= 0°C to
+85°C
1.470
1.500
1.530
T
A
= +25°C
to +85°C
0.492
0.500
0.508
Feedback Voltage Accuracy
V
FB
V
IN
= +3.3V,
I
LOAD
= 0,
MODE = low
FBSEL0=GND
FBSEL1=GND
REFIN=0.5V
T
A
= 0°C to
+85°C
0.490
0.500
0.510
V
Feedback Load-Regulation Error
V
IN
= +1.3V to +3.6V, I
LOAD
= 0 to 3A,
SKIP
= V
CC
0.1
%