LM5170
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ZHCSKK1B –DECEMBER 2019 –REVISED AUGUST 2021
over operating free-air temperature range (unless otherwise noted)(1)
MIN
NOM
MAX
12
UNIT
V
VVCC
TJ
External voltage applied to VCC
Operating junction temperature
Oscillator frequency
9
125
°C
–40
FOSC
FEX_CLK
tDT
50
500
kHz
kHz
ns
Synchronization to external clock frequency (minimal 50 kHz)
Programmable dead time
0.8 × FOSC
1.2 × FOSC
200
15
1
ISETD PWM frequency
1000
500
kHz
ns
SYNCIN pulse width
100
(1) Recommended Operating Conditions are conditions under which the device is intended to be functional. For specifications and test
conditions, see the Electrical Characteristics.
(2) Minimum input voltage in boost mode can be lower than 3 V after start-up, but is limited by the minimum off-time.
7.4 Thermal Information
LM5170
THERMAL METRIC(1)
PHP (TQFP)
48 PINS
25.1
UNIT
RθJA
Junction-to-ambient thermal resistance
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
RθJC(top)
RθJB
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
15.6
8.5
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
0.2
ψJT
8.5
ψJB
RθJC(bot)
1.1
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.5 Electrical Characteristics
FOSC = 100 kHz; VVCC = 10 V; VVIN = VHV-Port = 48 V and VLV-Port = 12 V, unless otherwise stated.(1)
PARAMETER
VIN SUPPLY (VIN, VINX)
ISHUTDOWN VIN pin current in shutdown mode
TEST CONDITIONS
MIN(3)
TYP(2)
MAX(3)
UNIT
VUVLO = 0 V
20
µA
VVCC > 9 V, VUVLO > 2.5 V, VEN1 = VEN2
= 0 V
ISTANDBY
VIN pin current, no switching
1
mA
VIN to VINX disconnect switch
VIN to VINX disconnect switch
VUVLO < 1 V or VVCC < 7.5 V
VUVLO > 2.6 V, VVCC > 9 V
5
MΩ
100
Ω
VCC AND VCCA BIAS SUPPLIES
VCCUVLO
VCCHYS
IVCC_SD
IVCC_SB
VCC undervoltage detection
VVCC falling
7.6
8.1
8
8.3
8.9
30
V
V
VCC UVLO hysteresis
VVCC rising
8.5
VCC sink current in shutdown mode
VCC sink current in standby: no switching
VUVLO = 0 V
µA
mA
VUVLO > 2.6 V, VEN1 = VEN2 = 0 V
10
MASTER ON/OFF CONTROL (UVLO)
VUVLO_TH
IHYS
UVLO release threshold
UVLO hysteresis current
UVLO voltage rising
2.4
21
2.5
25
2.6
29
V
UVLO source current when VUVLO > 2.6
V
µA
VSD
UVLO shutdown threshold (IC shutdown)
UVLO shutdown release
UVLO voltage falling
1
1.25
0.25
2.5
1
1.5
V
V
UVLO voltage rising above VSD
UVLO voltage falling
0.15
0.35
tUVLO
UVLO glitch filter time
µs
µA
UVLO internal pulldown current
CHANNEL ENABLE INPUTS EN1 AND EN2
VIL
VIH
Enable input low state
Enable input high state
Disabled the driver outputs
Enable the driver outputs
1
V
V
2
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