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LM27402 Folha de dados(PDF) 5 Page - Texas Instruments

Nome de Peças LM27402
Descrição Electrónicos  LM27402 High-Performance Synchronous Buck Controller With DCR Current Sensing
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Página de início  http://www.ti.com
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LM27402 Folha de dados(HTML) 5 Page - Texas Instruments

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LM27402
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SNVS615J – JANUARY 2010 – REVISED JULY 2015
6.3 Recommended Operating Conditions
MIN
MAX UNIT
VDD powered by internal LDO
3.0
20
VIN(1)
V
VDD tied to VIN
3.0
5.5
VDD
2.2
5.5
V
SS/TRACK, SYNC, EN
0
VVDD
V
PGOOD
0
5.5
V
Junction Temperature
–40
125
°C
(1)
VDD is the output of an internal linear regulator. Under normal operating conditions where VIN is greater than 5.5 V, VDD must not be
connected to any external voltage source. In an application where VIN is between 3.0 V and 5.5 V, connecting VIN to VDD maximizes
the bias supply rail voltage. In order to have better noise rejection under these conditions, a 1-
Ω and 1-µF RC input filter to VDD may be
used.
6.4 Thermal Information
LM27402
THERMAL METRIC(1)
RUM (WQFN)
PWP (HTSSOP)
UNIT
16 PINS
16 PINS
RθJA
Junction-to-ambient thermal resistance
35.3(2)
39.8(2)
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
32.7
25.6
°C/W
RθJB
Junction-to-board thermal resistance
12.9
18.8
°C/W
ψJT
Junction-to-top characterization parameter
0.3
0.7
°C/W
ψJB
Junction-to-board characterization parameter
13.0
18.6
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
3.3
2.5
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
(2)
Tested on a four layer JEDEC board. Four vias are provided under the WQFN exposed pad and nine vias are provided under the
HTSSOP exposed pad.
6.5 Electrical Characteristics
Unless otherwise stated, the following conditions apply: VVIN = 12 V. Limits in standard type are for TJ = 25°C only. 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.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OPERATIONAL SPECIFICATIONS
VFB = 0.6 V (not switching), TJ = 25°C
4.5
IQ
Quiescent Current
mA
VFB = 0.6 V (not switching), TJ = –40°C
6
to +125°C
VEN = 0 V, TJ = 25°C
25
IQSD
Quiescent Current In Shutdown
µA
VEN = 0 V, TJ = –40°C to +125°C
45
UVLO
VVIN Rising, VVDD Rising, TJ = 25°C
2.9
UVLO
Input Under Voltage Lockout
V
VVIN Rising, VVDD Rising, TJ = –40°C to
2.7
2.99
+125°C
UVLOHYS
UVLO Hysteresis
VVIN Falling, VVDD Falling
300
mV
REFERENCE
TJ = 25°C
0.600
VFB
Feedback Voltage
V
TJ = –40°C to +125°C
0.594
0.606
IFB
Feedback Pin Bias Current
VFB = 0.65 V
–50
0
50
nA
Copyright © 2010–2015, Texas Instruments Incorporated
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