Rainbow Electronics MAX5081 - Manual (Page 2)

MAX5080/MAX5081
1A, 40V, MAXPower Step-Down
DC-DC Converters
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.
IN, ON/OFF to SGND..............................................-0.3V to +45V
LX to SGND .................................................-0.3V to (V
IN
+ 0.3V)
BST to SGND ................................................-0.3V to (V
IN
+ 12V)
BST to LX................................................................-0.3V to +12V
PGND to SGND .....................................................-0.3V to +0.3V
REG, DVREG, SYNC to SGND ...............................-0.3V to +12V
FB, COMP, SS to SGND ...........................-0.3V to (V
REG + 0.3V)
C+ to PGND (MAX5080 only)................(V DVREG - 0.3V) to +12V
C- to PGND (MAX5080 only) ................-0.3V to (V DVREG + 0.3V)
Continuous current through internal power MOSFET (pins 11/12
connected together and pins 13/14 connected together)
T J = +125°C.........................................................................3A
T
J
= +150°C.........................................................................2A
Continuous Power Dissipation * (T
A
= +70°C)
16-Pin TQFN (derate 33.3mW/°C above +70°C) ...2666.7mW
16-Pin TQFN (
θ
JA
)........................................................30°C/W
16-Pin TQFN ( θ
JC
).......................................................1.7°C/W
Operating Temperature Range .........................-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(V
IN
= V
ON/OFF
= 12V, V
REG
= V
DVREG
, V
SYNC
= PGND = SGND, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values
are at T
A
= + 25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5080 4.5 40
Input Voltage Range V IN
MAX5081 7.5 40
V
V IN rising, MAX5080 3.9 4.2
Undervoltage Lockout Threshold UVLO
V
IN
rising, MAX5081 6.8 7.3
V
MAX5080 0.4
Undervoltage Lockout Hysteresis UVLO
HYST
MAX5081 0.7
V
V FB = 0V, MAX5080 10.5 Switching Supply Current (PWM
Operation)
I SW
V FB = 0V, MAX5081 9.5
mA
V IN = 12V, V OUT = 3.3V, I OUT = 1A 84
Efficiency V IN = 4.5V, V OUT = 3.3V, I OUT = 1A
(MAX5080)
88
%
MAX5080 1.4 2.5 No-Load Supply Current
(PFM Operation)
MAX5081 1.3 2.3
mA
Shutdown Current I SHDN V ON/OFF = 0V, V IN = 40V 200 300 µA
ON/ OFF CONTROL
Input Voltage Threshold V ON/ OFF V ON/ OFF rising 1.20 1.23 1.25 V
Input Voltage Hysteresis 0.12 V
Input Bias Current V ON/OFF = 0 to 40V -250 +250 nA
ERROR AMPLIFIER/SOFT-START
Soft-Start Current I SS 8 15 24 µA
Reference Voltage (Soft-Start) V SS 1.215 1.228 1.240 V
FB Regulation Voltage V FB I COMP = -500µA to +500µA 1.215 1.228 1.240 V
FB Input Range 0 1.5 V
FB Input Current -250 +250 nA
COMP Voltage Range I COMP = -500µA to +500µA 0.25 4.50 V
Open-Loop Gain 80 dB
Unity-Gain Bandwidth 1.8 MHz
*As per JEDEC 51 Standard