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LM25085SDE Folha de dados(PDF) 4 Page - Texas Instruments

Nome de Peças LM25085SDE
Descrição Electrónicos  LM25085, LM25085-Q1 42V Constant On-Time PFET Buck Switching Controller
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

LM25085SDE Folha de dados(HTML) 4 Page - Texas Instruments

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LM25085, LM25085-Q1
SNVS593H – OCTOBER 2008 – REVISED MARCH 2013
www.ti.com
Electrical Characteristics (continued)
Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C
to +125°C. Minimum and Maximum limits are specified through test, design, or statistical correlation. Typical values represent
the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated the
following conditions apply: VIN = 24V, RT = 100kΩ.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
RT Pin
RTSD
Shutdown Threshold
RT Pin Voltage Rising
0.73
V
RTHYS
Shutdown Threshold Hysteresis
50
mV
On-Time
tON – 1
On-Time
VIN = 4.5V, RT = 100kΩ
3.5
5
7.15
µs
tON – 2
VIN = 24V, RT = 100kΩ
560
720
870
ns
tON - 3
VIN = 42V, RT = 100kΩ
329
415
500
ns
tON - 4
Minimum On-Time in Current Limit
VIN = 24V, 25mV Overdrive at ISEN
55
140
235
ns
(3)
Off-Time
tOFF(CL1)
Off-Time (Current Limit) (3)
VIN = 12V, VFB = 0V
5.35
7.9
10.84
µs
tOFF(CL2)
VIN = 12V, VFB = 1V
1.42
1.9
3.03
µs
tOFF(CL3)
VIN = 24V, VFB = 0V
8.9
13
17.7
µs
tOFF(CL4)
VIN = 24V, VFB = 1V
2.22
3.2
4.68
µs
Regulation and Over-Voltage Comparators (FB Pin)
VREF
FB Regulation Threshold
1.225
1.25
1.275
V
VOV
FB Over-Voltage Threshold
Measured With Respect to VREF
350
mV
IFB
FB Bias Current
10
nA
Soft-Start Function
tSS
Soft-Start Time
1.4
2.5
4.3
ms
Thermal Shutdown
TSD
Junction Shutdown Temperature
Junction Temperature Rising
170
°C
THYS
Junction Shutdown Hysteresis
20
°C
Thermal Resistance(4)
θJA
Junction to Ambient, 0 LFPM Air
VSSOP-8 package
126
°C/W
Flow (5)
HVSSOP-PowerPAD-8 package
46
WSON-8 package
54
θJC
Junction to Case, 0 LFPM Air Flow
VSSOP-8 package
29
°C/W
(5)
HVSSOP-PowerPAD-8 package
5.5
WSON-8 package
9.1
(3)
The tolerance of the minimum on-time (tON-4) and the current limit off-times (tOFF(CL1) through (tOFF(CL4)) track each other over process
and temperature variations. A device which has an on-time at the high end of the range will have an off-time that is at the high end of its
range.
(4)
For detailed information on soldering plastic VSSOP and WSON packages visit www.ti.com/packaging.
(5)
Tested on a 4 layer JEDEC board. Four vias provided under the exposed pad. See JEDEC standards JESD51-5 and JESD51-7.
4
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Product Folder Links: LM25085 LM25085-Q1


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