Operating Temperature Range ...........................-40°C to 125°C
Junction Temperature (Note 1) ........................................+150°C
Storage Temperature Range ...............................-55°C to 150°C
Soldering Temperature (reflow) .......................................+240°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.
Package Information
PACKAGE TYPE: 29-PIN SiP
Package Code
Outline Number
Land Pattern Number
Junction to Ambient (θ
JA
)
L29915#1
21-100177
90-100055
24ºC/W
THERMAL RESISTANCE, FOUR-LAYER BOARD
(Note 2)
For the latest package outline information and land patterns (footprints), go to
www.maximintegrated.com/packages.
Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Note 1:
Junction temperature greater than +125°C degrades operating lifetimes.
Note 2:
Package thermal resistance is measured on an evaluation board with natural convection.
Electrical Characteristics
(V
IN
= V
EN/UVLO
= 24V, R
RT
= OPEN (450kHz), V
PGND
= V
SGND
= V
MODE/SYNC
= 0V, LX = SS =
RESET
= CF = DL = V
CC
= OUT
= open, V
EXTVCC
= 0V, V
BST
to V
LX
= 5V, V
FB
= 1V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.
All voltages are referenced to SGND, unless otherwise noted.) (Note 3)
PARAMETER
INPUT SUPPLY (V
IN
)
Input-Voltage Range
Input-Shutdown Current
V
IN
I
IN_SH
I
Q_PFM
Input-Quiescent Current
I
Q_DCM
I
Q_PWM
V
EN/UVLO
= 0V, (Shutdown mode)
MODE/SYNC = open
DCM Mode
PWM Mode, no load,
V
OUT
= V
EXTVCC
= 5V
V
EN/UVLO
rising
V
EN/UVLO
falling
Pullup resistor between IN and
EN/UVLO pins
1.185
1.06
3.15
4.5
11
128
1.27
18
2
mA
42
16
V
μA
μA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ENABLE/UNDERVOLTAGE LOCKOUT (EN/UVLO)
EN/UVLO Threshold
Enable Pullup Resistor
V
ENR
V
ENF
R
ENP
1.215
1.09
3.32
1.245
1.12
3.45
V
MΩ
www.maximintegrated.com
Maxim Integrated
│
3
MAXM17546
4.5V to 42V, 5A High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Electrical Characteristics (continued)
(V
IN
= V
EN/UVLO
= 24V, R
RT
= OPEN (450kHz), V
PGND
= V
SGND
= V
MODE/SYNC
= 0V, LX = SS =
RESET
= CF = DL = V
CC
= OUT
= open, V
EXTVCC
= 0V, V
BST
to V
LX
= 5V, V
FB
= 1V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.
All voltages are referenced to SGND, unless otherwise noted.) (Note 3)
PARAMETER
LOW DROPOUT (INLDO)
V
CC
Output-Voltage
Range
V
CC
Current Limit
IN to V
CC
Dropout
V
CC
UVLO
LOW DROPOUT (EXTVCC)
EXTVCC Operating-
Voltage Range
EXTVCC Switch-Over
Voltage
EXTVCC to V
CC
Dropout
EXTVCC Current Limit
SOFT-START (SS)
Charging Current
OUTPUT SPECIFICATIONS
Line-Regulation Accuracy
Load-Regulation Accuracy
FB-Regulation Voltage
FB Input-Bias Current
FB Undervoltage Trip Level
to Cause Hiccup
HICCUP Timeout
MODE/SYNC PIN
V
M_DCM
MODE Threshold
V
M_PFM
V
M_PWM
SYNC Frequency-
Capture Range
SYNC Pulse Width
SYNC Threshold
V
IH
V
IL
MODE/SYNC = V
CC
(DCM Mode)
MODE/SYNC = OPEN (PFM mode)
MODE/SYNC = GND (PWM mode)
f
SW
set by R
RT
1.1 x
f
SW
50
2.0
0.8
V
CC
- 0.6
V
CC
/ 2
0.6
1.4 x
f
SW
kHz
ns
V
V
V
FB_REG
I
FB
V
FB_HICF
V
IN
= 6.5V to 42V, V
OUT
= 5V
Tested with I
OUT
= 0A to 5A at V
OUT
= 5V
MODE/SYNC = SGND or MODE = V
CC
MODE/SYNC = OPEN
0 < V
FB
< 1V
0.8875
0.8875
-75
0.55
0.58
32768
0.1
6
0.9
0.915
0.9135
0.936
+75
0.61
mV/V
mV/A
V
nA
V
Cycles
I
SS
V
SS
= 0.5V
4.7
5
5.3
μA
V
EXTVCC_DO
Rising
Falling
V
EXTVCC
= 5V, I
EXTVCC
= 45mA
45
85
I
EXTVCC_MAX
V
CC
= 4.3V, EXTVCC = 8V
4.84
4.56
4.33
4.7
4.45
24
4.84
4.6
0.6
140
V
V
V
mA
V
CC
I
VCC_MAX
V
CC_DO
V
CC_UVR
V
CC_UVF
6V < V
IN
< 42V, I
VCC
= 1mA
1mA < I
VCC
< 45mA
V
CC
= 4.3V, V
IN
= 7V
V
IN
= 4.5V, I
VCC
= 45mA
V
CC
rising
V
CC
falling
4.1
3.7
4.2
3.8
4.75
4.75
50
5
5
90
5.25
5.25
150
0.4
4.3
3.9
V
mA
V
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
www.maximintegrated.com
Maxim Integrated
│
4
MAXM17546
4.5V to 42V, 5A High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Electrical Characteristics (continued)
(V
IN
= V
EN/UVLO
= 24V, R
RT
= OPEN (450kHz), V
PGND
= V
SGND
= V
MODE/SYNC
= 0V, LX = SS =
RESET
= CF = DL = V
CC
= OUT
= open, V
EXTVCC
= 0V, V
BST
to V
LX
= 5V, V
FB
= 1V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.
All voltages are referenced to SGND, unless otherwise noted.) (Note 3)
PARAMETER
CURRENT LIMIT
Average Current-Limit
Threshold
RT PIN
R
RT
= 196KΩ
Switching Frequency
Minimum On-Time
Minimum Off-time
LX Dead Time
RESET
PIN
RESET
Output-Level Low
RESET
Output-Leakage
Current
V
OUT
Threshold for
RESET
Assertion
V
OUT
Threshold for
RESET
Deassertion
RESET
Deassertion Delay
after FB Reaches 95%
Regulation
THERMAL SHUTDOWN
Thermal-Shutdown
Threshold
Thermal-Shutdown
Hystersis
Temperature Rising
165
10
°C
°C
V
OUT_OKF
V
OUT_OKR
f
SW
t
ON(MIN)
t
OFF(MIN)
t
DT
I
RESET
= 10mA
V
RESET
= 5.5V
V
FB
falling
V
FB
rising
-100
90.4
93.4
92.5
95.5
140
22
400
100
94.6
97.7
R
RT
= open
R
RT
= 7.5kΩ
90
420
1950
100
450
2200
114
110
480
2450
160
160
ns
ns
ns
mV
nA
%
%
kHz
I
AVG_LIMIT
6.75
A
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
1024
Cycles
Note 3:
Electrical specifications are production tested at T
A
= + 25°C. Specifications over the entire operating temperature range are
便携式数字数据采集系统（PDDAS）使用了LabVIEW实时模块和PXI，以控制风洞测试和采集记录来自128个不同通道的空气压力数据 "通过LabVIEW实时模块，可以在各种操作情况下获得采集空气压力数据及向风洞提供反馈控制信号所需的确定性响应时间。" – Dave Scheibenhoffer, G Systems 挑战: 用一个可采集、分析和存储来自下一代喷气式战斗机引擎设计的动...[详细]
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