MAX1966/MAX1967
Low-Cost Voltage-Mode PWM
Step-Down Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN = VL = VCC = 5V (MAX1967), VIN = 5V (MAX1966), T
A
= -40°C to +85°C (Note 1), 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.
(All Voltages Referenced to GND, Unless Otherwise Noted)
VIN to GND (MAX1966)............................................-0.3V to +6V
VIN to GND (MAX1967)..........................................-0.3V to +30V
VCC to GND (MAX1967)..........-0.3V, lower of 6V or (V
IN
+ 0.3V)
FB to GND ................................................................-0.3V to +6V
DL, COMP/EN to GND (MAX1966) ................-0.3V to V
IN
+ 0.3V
VL, DL, COMP/EN to GND (MAX1967).........-0.3V to V
CC
+ 0.3V
BST to LX..................................................................-0.3V to +6V
DH to LX........................................................-0.3V to BST + 0.3V
VL Short to GND (MAX1967) ....................................................5s
RMS Input Current (any pin).............................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
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
MAX1967 VIN Operating Range 4.9 28 V
MAX1967 Operating Range with
VIN = VL
2.7 5.5 V
MAX1966 VIN Operating Range 2.7 5.5 V
MAX1967 VL Undervoltage
Lockout (UVLO) Trip Level
Rising and falling edge, hysteresis = 2% 2.35 2.53 2.66 V
MAX1966 VIN UVLO
Trip Level
Rising and falling edge, hysteresis = 2% 2.35 2.53 2.66 V
Operating Supply Current FB = 0.88V, no switching 0.7 3 mA
V L Outp ut V ol tag e ( M AX 1967 Onl y)
5.5V < VIN < 28V, 1mA < I
VL
< 25mA,
FB = 0.88V
4.67 5 5.3 V
Thermal Shutdown (Note 1) Rising temperature, typical hysteresis = 10°C 160 °C
OSCILLATOR
0°C to +85°C 82 102 124
Frequency f
OSC
-40°C to +85°C 79 102 127
kHz
Minimum Duty Cycle 10 %
Maximum Duty Cycle 90 95 %
SOFT-START
Digital Ramp Period
Internal 6-bit DAC for converter to ramp from
0 to full output voltage
1024 /
f
OSC
s
Soft-Start Levels
V
OUT
/
64
V
ERROR AMPLIFIER
2.7V < VCC < 5.5V, 0°C to +85°C 0.787 0.800 0.815
FB Regulation Voltage
(MAX1967)
2.7V < VCC < 5.5V, -40°C to +85°C 0.782 0.800 0.815
V
2.7V < VIN < 5.5V, 0°C to +85°C 0.787 0.800 0.815
FB Regulation Voltage
(MAX1966)
2.7V < VIN < 5.5V, -40°C to +85°C 0.782 0.800 0.815
V
FB to COMP/EN Gain 4000 V/V
