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, All-Ceramic, 2.6V to 5.5V Input,
2A PWM Step-Down DC-to-DC Regulators
MAX1951/MAX1952
ABSOLUTE MAXIMUM RATINGS
IN, V
CC
to GND ........................................................-0.3V to +6V
COMP, FB, REF to GND .............................-0.3V to (V
CC
+ 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 (θ
JA
) (Note 2)...............................82°C/W
Package Junction-to-Case
Thermal Resistance (θ
JC
) (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
(V
IN
= V
CC
= 3.3V, PGND = GND, FB in regulation, C
REF
= 0.1µF,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at
T
A
= +25°C.)
PARAMETER
IN AND V
CC
IN Voltage Range
Supply Current
Shutdown Current
V
CC
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
From FB to COMP, V
COMP
= 1.25V
V
IN
= 2.6V to 5.5V, V
FB
= 1.3V
V
IN
= 2.6V to 5.5V, V
FB
= 1.1V
From COMP to GND, V
IN
= 2V
When LX starts/stops switching
COMP = GND
COMP rising
COMP falling
0.17
15
MAX1951
MAX1952
40
26.7
0.6
1.97
60
40
1
2.15
15
0.6
0.4
25
40
80
53.3
1.2
2.28
30
1
µS
V
V
Ω
V
µA
I
REF
= 0µA, V
IN
= 2.6V to 5.5V
I
REF
= 0 to 40µA, V
IN
= 2.6V to 5.5V
I
REF
= 20µA, V
IN
= 2.6V to 5.5V
From REF to GND, COMP = GND
1.96
2
0.01
0.01
12
2.03
0.2
0.4
22
V
%
%
Ω
Switching with no load, LX unconnected
COMP = GND
When LX starts/stops switching
V
CC
rising
V
CC
falling
2
V
IN
= 5.5V
2.6
6
0.5
2.35
2.25
5.5
10
1.0
2.5
V
mA
mA
V
CONDITIONS
MIN
TYP
MAX
UNITS
When using external feedback resistors to drive FB
这是一份协作蓝图，旨在通过 Arm 的汽车创新生态系统，应对集成复杂性并打造可扩展解决方案。 未来出行的变革不仅在颠覆汽车行业，更在不断加剧汽车的复杂性。由人工智能 (AI) 驱动的驾驶体验、车云互联能力与云原生开发，正在重塑汽车的设计、制造与体验。 汽车中先进软件与 AI 能力的快速集成和持续部署，为日益复杂的系统带来了诸多挑战：如何确保无缝集成、实时性能、功能安全与网络安全？此外，协...[详细]
stm32/stm8
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
