MAX1951ESA データシートの表示（PDF） - Maxim Integrated
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MAX1951ESA
Maxim Integrated
MAX1951ESA Datasheet PDF : 15 Pages
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1MHz, All-Ceramic, 2.6V to 5.5V Input,
2A PWM Step-Down DC-to-DC Regulators
ABSOLUTE MAXIMUM RATINGS
IN, VCC to GND ........................................................-0.3V to +6V
COMP, FB, REF to GND .............................-0.3V to (VCC + 0.3V)
LX to Current (Note 1).........................................................±4.5A
PGND to GND .............................................Internally Connected
Continuous Power Dissipation (TA = +85°C)
8-Pin SO (derate 12.2mW/°C above +70°C)................976mW
Package Junction-to-Ambient
Thermal Resistance (θJA) (Note 2)...............................82°C/W
Package Junction-to-Case
Thermal Resistance (θJC) (Note 2) ..............................32°C/W
Operating Temperature Range
MAX195_ ESA..................................................-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
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.
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.
ELECTRICAL CHARACTERISTICS
(VIN = VCC = 3.3V, PGND = GND, FB in regulation, CREF = 0.1µF, TA = 0°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C.)
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
IN AND VCC
IN Voltage Range
Supply Current
Shutdown Current
VCC Undervoltage Lockout
Threshold
REF
REF Voltage
REF Load Regulation
REF Line Regulation
REF Shutdown Resistance
COMP
COMP Transconductance
COMP Clamp Voltage, Low
COMP Clamp Voltage, High
COMP Shutdown Resistance
COMP Shutdown Threshold
COMP Startup Current
FB
Output Voltage Range
(MAX1951)
FB Regulation Voltage
(Error Amp Only)
FB Input Resistance
FB Input Bias Current
Switching with no load, LX unconnected
COMP = GND
When LX starts/stops switching
VIN = 5.5V
VCC rising
VCC falling
IREF = 0µA, VIN = 2.6V to 5.5V
IREF = 0 to 40µA, VIN = 2.6V to 5.5V
IREF = 20µA, VIN = 2.6V to 5.5V
From REF to GND, COMP = GND
From FB to COMP, VCOMP = 1.25V
VIN = 2.6V to 5.5V, VFB = 1.3V
VIN = 2.6V to 5.5V, VFB = 1.1V
From COMP to GND, VIN = 2V
When LX starts/stops switching
COMP = GND
MAX1951
MAX1952
COMP rising
COMP falling
When using external feedback resistors to drive FB
VCOMP = 1V to 2V,
IOUT = 0 to 1.5A
VIN = 2.6V to 5.5V
VIN = 2.8V to 5.5V
MAX1951
MAX1952
MAX1952
MAX1951
2.6
2
1.96
40
26.7
0.6
1.97
0.17
15
0.8
0.787
1.773
13
-0.1
5.5
V
6
10
mA
0.5
1.0
mA
2.35
2.5
V
2.25
2
2.03
V
0.01
0.2
%
0.01
0.4
%
12
22
Ω
60
80
µS
40
53.3
1
1.2
V
2.15
2.28
V
15
30
Ω
0.6
1
V
0.4
25
40
µA
VIN
V
0.795 0.803
V
1.8
1.827
18
28
kΩ
+0.1
µA
2 _______________________________________________________________________________________
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