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MAX17543 数据表(PDF) 3 Page - Maxim Integrated Products

部件名 MAX17543
功能描述  4.5V??2V, 2.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation
PDF  19 Pages
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制造商  MAXIM [Maxim Integrated Products]
网页  https://www.maximintegrated.com/en.html
标志 MAXIM - Maxim Integrated Products

MAX17543 数据表(HTML) 3 Page - Maxim Integrated Products

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(VIN = VEN/UVLO = 24V, RRT = 40.2kΩ (500kHz), CVCC = 2.2μF, VPGND = VSGND = VMODE = VSYNC = 0V, LX = SS = RESET =
open, VBST to VLX = 5V, VFB = 1V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are
referenced to SGND, unless otherwise noted.) (Note 2)
Electrical Characteristics (continued)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
POWER MOSFET AND BST DRIVER
High-Side nMOS On-Resistance
RDS-ONH
ILX = 0.3A
165
325
mΩ
Low-Side nMOS On-Resistance
RDS-ONL
ILX = 0.3A
80
150
mΩ
LX Leakage Current
ILX_LKG
VLX = VIN - 1V, VLX = VPGND + 1V, TA = +25ºC
-2
+2
µA
SOFT-START (SS)
Charging Current
ISS
VSS = 0.5V
4.7
5
5.3
µA
FEEDBACK (FB)
FB Regulation Voltage
VFB_REG
MODE = SGND or MODE = VCC
0.89
0.9
0.91
V
MODE = OPEN
0.89
0.915 0.936
FB Input Bias Current
IFB
0 < VFB < 1V, TA = +25ºC
-50
+50
nA
MODE
MODE Threshold
VM-DCM
MODE = VCC (DCM mode)
VCC -
1.6
V
VM-PFM
MODE = open (PFM mode)
VCC / 2
VM-PWM
MODE = GND (PWM mode)
1.4
CURRENT LIMIT
Peak Current-Limit Threshold
IPEAK-LIMIT
3.2
3.7
4.3
A
Runaway Current-Limit Threshold
IRUNAWAY-LIMIT
3.7
4.3
5
A
Valley Current-Limit Threshold
ISINK-LIMIT
MODE = open/VCC
-0.16
0
+0.16
A
MODE = GND
-1.8
PFM Current-Limit Threshold
IPFM
MODE = open
0.6
0.75
0.9
A
RT AND SYNC
Switching Frequency
fSW
RRT = 210kΩ
90
100
110
kHz
RRT = 102kΩ
180
200
220
RRT = 40.2kΩ
475
500
525
RRT = 8.06kΩ
1950
2200 2450
RRT = open
460
500
540
SYNC Frequency Capture Range
fSW set by RRT
1.1 x
fSW
1.4 x
fSW
kHz
SYNC Pulse Width
50
ns
SYNC Threshold
VIH
2.1
V
VIL
0.8
FB Undervoltage Trip Level to
Cause Hiccup
VFB-HICF
0.56
0.58
0.65
V
MAX17543
4.5V–42V, 2.5A, High-Efficiency,
Synchronous Step-Down DC-DC Converter
with Internal Compensation
www.maximintegrated.com
Maxim Integrated │ 3



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