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LM20333 Datasheet(PDF) 4 Page - Texas Instruments

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No. de pieza LM20333
Descripción Electrónicos  LM20333 36V, 3A Synchronous Buck Regulator with Frequency Synchronization
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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LM20333
SNVS558D – MAY 2008 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics (continued)
Unless otherwise stated, the following conditions apply: VVIN = 12V. Limits in standard type are for TJ = 25°C only, limits in
bold face 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.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
FOSCL
Minimum SYNC Frequency
250
kHz
VIH_SYNC
SYNC pin Logic High
2
V
VIL_SYNC
SYNC pin Logic Low
0.8
V
ISYNC
SYNC pin input leakage
VSYNC = 5V
10
nA
TMIN
Minimum Off Time
ILOAD = 3A
170
ns
Error Amplifier
IFB
Feedback Pin Bias Current
VFB = 1V
50
nA
ICOMP(SRC)
COMP Output Source Current
VFB = 0V
200
400
µA
VCOMP = 0V
ICOMP(SNK)
COMP Output Sink Current
VFB = 1.6V
200
350
µA
VCOMP = 1.6V
gm
Error Amplifier DC Transconductance
ICOMP = -50 µA to +50 µA
450
515
600
µmho
AVOL
Error Amplifier Voltage Gain
COMP pin open
2000
V/V
GBW
Error Amplifier Gain-Bandwidth Product
COMP pin open
7
MHz
Current Limit
ILIM
Cycle By Cycle Positive Current Limit
4.3
5.2
6.0
A
ILIMNEG
Cycle By Cycle Negative Current Limit
2.8
A
TILIM
Cycle By Cycle Current Limit Delay
150
ns
Enable
VEN(RISING)
EN Pin Rising Threshold
1.2
1.25
1.3
V
VEN(HYS)
EN Pin Hysteresis
50
mV
IEN
EN Source Current
VEN = 0V, VVIN = 12V
2
µA
Thermal Shutdown
TSD
Thermal Shutdown
170
°C
TSD(HYS)
Thermal Shutdown Hysteresis
20
°C
Thermal Resistance
θJC
Junction to Case
5.6
°C/W
θJA
Junction to Ambient(1)
0 LFM airflow
27
°C/W
(1)
Measured on a 4 layer 2" x 2" PCB with 1 oz. copper weight inner layers and 2 oz. outer layers.
4
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