Datasheet
MAX1960/MAX1961/MAX1962
2.35V to 5.5V, 0.5% Accurate, 1MHz PWM
Step-Down Controllers with Voltage Margining
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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
, CTL_, CS, FSET/SYNC, SEL, EN,
OUT to GND ..........................................................-0.3V to +6V
ILIM, COMP, REF, FB, CLKOUT,
C- to GND ..............................................-0.3V to V
AVDD
+ 0.3V
C+ to GND.............-0.3V to higher of V
VCC
+ 1V or V
VDD
+ 0.3V
V
DD
, AV
DD
to GND..............-0.3V to higher of V
VCC
- 0.3V or 6V
DL to PGND ................................................-0.3V to V
VDD
+ 0.3V
BST to GND ............................................................-0.3V to +12V
DH to LX ...................................................................-0.3V to +6V
LX to BST..................................................................-6V to +0.3V
PGND to GND, or V
DD
to AV
DD
............................-0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70°C)
20-Pin QSOP (derate up to +70°C)..............................727mW
20-Pin QSOP (derate above +70°C)........................9.1mW/°C
Operating Temperature Range (Extended).........-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
(V
VCC
= 3.3V, Circuits of Figures 9–12, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Input Voltage Range 2.35 5.5 V
V
CC
Input Voltage UVLO Rising or falling, hysteresis = 33mV (typ) 1.95 2.3 V
V
DD
Input Voltage UVLO Rising or falling, hysteresis = 44mV (typ) 3.9 4.45 V
Output Voltage 0.8 V
MAX1960/MAX1962 (measured at FB) 0.796 0.800 0.804
SEL = GND 1.492 1.500 1.508
SEL = REF 1.791 1.800 1.809
SEL not connected 2.487 2.500 2.514
DC Output Accuracy
MAX1961/
MAX1962 (FB = V
DD
),
measured at output
SEL = V
DD
3.272 3.300 3.336
V
Positive Voltage-Margining Shift MAX1960/MAX1961 +3.8 +4 +4.2 %
Negative Voltage-Margining Shift MAX1960/MAX1961 -3.8 -4 -4.2 %
Load Regulation Error 0V to full load 0.08 %
Line Regulation Error V
VCC
= 2.7V to 5.5V 0.1 %
FB Input Bias Current -0.2 +0.2 µA
Feedback Transconductance 1 2 3 mS
COMP Discharge Resistance In shutdown 10 100 Ω
DC-DC Soft-Start Time 1280 cycles
FSET/SYNC = GND 450 500 550
Switching Frequency
FSET/SYNC = V
CC
880 1000 1120
kHz
SYNC Frequency Range 450 1200 kHz
Maximum Duty Cycle f = 1MHz 80 83 %
Maximum Duty Cycle f = 500kHz 90 92 %
Quiescent Supply Current 11 15 mA
Shutdown Supply Current 15 µA