For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1MHz, 2A, 2.6V to 5.5V Input, PWM DC-DC
Step-Down Regulator with Enable
MAX1951A
ABSOLUTE MAXIMUM RATINGS
IN, V
CC
to GND ........................................................-0.3V to +6V
COMP, FB, EN to GND...............................-0.3V to (V
CC
+ 0.3V)
LX Current (Note 1).............................................................±4.5A
PGND to GND..............................................Internally connected
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 12.2mW/°C above +70°C).................976mW
Junction-to-Case Thermal Resistance (
θ
JC
) (Note 2)
8-Pin SO ........................................................................32°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature Range ............................-40°C to +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°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.
Note 1:
LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s package power dissipation limits.
Note 2:
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to
www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V
IN
= V
CC
= V
EN
= 3.3V, V
PGND
= V
GND
= 0V, FB in regulation, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 3)
PARAMETER
IN AND V
CC
IN Voltage Range
Supply Current
Shutdown Current
V
CC
Undervoltage Lockout
Threshold
COMP
COMP Transconductance
COMP Clamp Voltage, Low
COMP Clamp Voltage, High
FB
Output Voltage Range
FB Regulation Voltage
(Error Amplifier Only)
FB Input Bias Current
LX
V
IN
= 5V
LX On-Resistance, PMOS
I
LX
= -180mA
V
IN
= 3.3V
V
IN
= 2.6V
V
IN
= 5V
LX On-Resistance, NMOS
I
LX
= 180mA
V
IN
= 3.3V
V
IN
= 2.6V
119
145
171
122
133
142
246
mΩ
266
mΩ
When using external feedback resistors to drive FB
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