Datasheet

MAX1830/MAX1831
3A, 1MHz, Low-Voltage, Step-Down Regulators with
Synchronous Rectification and Internal Switches
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
CC
= +3.3V, FBSEL = GND, T
A
= 0°C to +85°C, unless otherwise 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.
V
CC
, IN, SHDN to GND ............................................-0.3V to +6V
IN to V
CC
.............................................................................±0.3V
GND to PGND.....................................................................±0.3V
COMP, FB, TOFF, FBSEL, REF to GND .....-0.3V to (V
CC
+ 0.3V)
LX Current (Note 1) ...............................................................5.1A
REF Short Circuit to GND Duration ............................Continuous
ESD Protection .....................................................................±2kV
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 14mW/°C above +70°C;
part mounted on 1in
2
of 1oz copper).............................1.12W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) ................................ +300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage V
IN
, V
CC
3.0 5.5 V
FBSEL = V
CC
2.487 2.525 2.563
FBSEL =
unconnected
1.492 1.515 1.538
FBSEL = REF
(MAX1830)
1.791 1.818 1.845
V
IN
= +3V to +5.5V,
I
LOAD
= 0 to 3A,
V
FB
= V
OUT
FBSEL = GND 1.084 1.100 1.117
Preset Output Voltage V
OUT
V
IN
= +3.7V to +5.5V,
I
LOAD
= 0 to 3A,
V
FB
= V
OUT
FBSEL = REF
(MAX1831)
3.283 3.333 3.383
V
Adjustable Output Voltage Range
V
CC
= V
IN
= +3V to +5.5V, I
LOAD
= 0,
FBSEL = GND
V
REF
V
IN
V
AC Load Regulation Error 2%
DC Load Regulation Error 0.4 %
Dropout Voltage V
DO
V
CC
= V
IN
= +3V, I
LOAD
= 3A 150 330 mV
Reference Voltage V
REF
1.089 1.100 1.111 V
Reference Load Regulation ∆V
REF
I
REF
= -1µA to +10µA 0.5 2 mV
Current-Limit Threshold I
LIMIT
4.0 4.8 5.4 A
Maximum Output RMS Current I
OUT
(
RMS
)
(Note 4) 3.4 A
Idle Mode Current Threshold I
IM
0.2 0.6 1.0 A
V
IN
= 4.5V 45 90
PMOS Switch On-Resistance R
ON
,
P
I
LX
= 0.5A
V
IN
= 3V 50 110
V
IN
= 4.5V 55 95
NMOS Switch On-Resistance R
ON
,
N
I
LX
= 0.5A
V
IN
= 3V 55 100
mΩ
Switching Frequency f (Note 2) 1 MHz
No-Load Supply Current I
IN
+ I
CC
V
FB
= 1.2V 325 750 µA
Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias the diode should take care not to exceed the IC’s
package power dissipation.