MAX1951A Просмотр технического описания (PDF) - Maxim Integrated
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MAX1951A Datasheet PDF : 12 Pages
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1MHz, 2A, 2.6V to 5.5V Input, PWM DC-DC
Step-Down Regulator with Enable
ABSOLUTE MAXIMUM RATINGS
IN, VCC to GND ........................................................-0.3V to +6V
COMP, FB, EN to GND...............................-0.3V to (VCC + 0.3V)
LX Current (Note 1).............................................................±4.5A
PGND to GND..............................................Internally connected
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 12.2mW/°C above +70°C).................976mW
Junction-to-Case Thermal Resistance (θJC) (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
(VIN = VCC = VEN = 3.3V, VPGND = VGND = 0V, FB in regulation, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IN AND VCC
IN Voltage Range
2.6
5.5
V
Supply Current
Shutdown Current
Switching with no load, LX floating
EN = GND
VIN = 5.5V
7
10
mA
0.1
0.4
mA
VCC Undervoltage Lockout
Threshold
COMP
COMP Transconductance
COMP Clamp Voltage, Low
COMP Clamp Voltage, High
FB
When LX starts/stops switching
VCC rising
VCC falling
From FB to COMP, VCOMP = 0.8V
VIN = 2.6V to 5.5V, VFB = 0.9V
VIN = 2.6V to 5.5V, VFB = 0.7V
2.19 2.32
V
1.92 2.07
40
50
80
µS
0.6
1
1.45
V
1.97 2.13 2.28
V
Output Voltage Range
When using external feedback resistors to drive FB
0.8
VIN
V
FB Regulation Voltage
(Error Amplifier Only)
FB Input Bias Current
LX
LX On-Resistance, PMOS
LX On-Resistance, NMOS
IOUT = 0A to 1.5A, VIN = 2.6V to TA = 0°C to +85°C 0.789 0.796 0.804
V
5.5V
TA = -40°C to +85°C 0.786
0.804
PNP input stage
-0.1
+0.1
µA
ILX = -180mA
ILX = 180mA
VIN = 5V
VIN = 3.3V
VIN = 2.6V
VIN = 5V
VIN = 3.3V
VIN = 2.6V
119
145 266
mΩ
171
122
133 246
mΩ
142
2 _______________________________________________________________________________________
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