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LM3754 Scheda tecnica(PDF) 5 Page - Texas Instruments

Il numero della parte LM3754
Spiegazioni elettronici  Scalable 2-Phase Synchronous Buck Controller with Integrated FET Drivers and Linear Regulator Controller
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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LM3754 Scheda tecnica(HTML) 5 Page - Texas Instruments

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LM3754
www.ti.com
SNVS789B – JANUARY 2012 – REVISED APRIL 2013
Operating Ratings
(1) (continued)
Thermal Data
Junction-to-Ambient Thermal Resistance (
θJA), WQFN-32 Package
(2)
26.4°C/W
(2)
Tested on a four layer JEDEC board. Four vias provided under the exposed pad. See JEDEC standards JESD51-5 and JESD51-7.
Electrical Characteristics
Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of −5°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 VVIN =
12V, VVDD = 5V, VVCC = internal LDO, VEN = 2V, RFRQ = 78.7 kΩ, VPH = 0V, VCS1 = VCS2 = VCSM = VSS = VSNSP = 1.8V, VILIM
VCSM = 100 mV, VSNSM = VSYNC = 0V, VSYNCOUT floating.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
System Accuracy
VOUT
Output Voltage Accuracy
VOUT = 3.6V
–0.65
–0.11
0.45
%
Includes trimmed EA and diff
VOUT = 2.5V
–0.75
–0.134
0.6
%
amplifier offset and gain errors;
VOUT = 1.8V
–0.9
–0.165
0.7
%
0.5 mA load at VDIF
VOUT = 0.6V
–2.25
–0.4
1.25
%
Phase Current Equalization
ΔIPH
Current Equalization (from
VCSM = 1.8V, VCS1 = VCS2 = VCSM + 30 mV,
–12
12
%
average per phase current)
VIAVE = 740 mV, VCOMP = 1.9V
System Supplies and UVLO
VIN
IVIN
VIN Operating Current
2-phase switching gate drivers unloaded
15
mA
IVIN-Q
VIN Quiescent Current
VFB = 650 mV, no PWM switching,
9
18
mA
NBASE is floating (no NPN)
IVIN-SD
VIN Shutdown Current
VEN = 0V
200
450
µA
VCC
VVCC
VCC Linear Regulator Output
0 to 3 mA sourced to an external load;
4.25
4.35
4.45
V
Voltage
VVIN = 5.5V to 18V
IVCC
VCC Input Current from External
VVIN = 5.5V, VVCC = 5.5V
10
20
mA
Supply
IVCC-SD
VCC Input Shutdown Current
VEN = 0V, VVIN = 12V, VVCC = 5V
260
µA
from External Supply
IVCC-LIM
VCC Output Current Limit
VVCC = 2.5V
9
30
53
mA
VVCC = 0V
50
VVCC-EN
VCC UVLO Thresholds
VVCC Rising
4.04
4.14
4.24
V
VVCC Falling
3.9
4
4.1
VVCC-HYS
VCC Threshold Hysteresis
140
mV
tD-VCC
VCC UVLO/UVP Debounce Time
8
µs
VDD, NBASE, BOOT1, BOOT2, SW1, SW2
VVDD
VDD Controller Regulation
VVIN = 6V to 18V
4.6
4.85
5.1
V
Voltage
VNBASE
VIN-to-NBASE Dropout
VVIN − 5.5V, 700 mV source connected from
330
mV
VDD to NBASE, INBASE = 5 mA
VVIN − 5.5V, 700 mV source connected from
130
VDD to NBASE, INBASE = 1 mA
VNBASE-REG
NBASE Load Regulation
VVIN = 18V, 700 mV source connected from
4
mV
VDD to NBASE, INBASE steps 1 mA to 5 mA
IVDD
VDD Operating Current from
VVDD = VVIN = VVCC = 5.5V, fSW = 300 kHz,
1
mA
External Power Supply
Gate Drivers unloaded
IVDD-SD
VDD Shutdown Current
VEN = 0V, VVIN = 12V, VVDD = 5V
2
30
µA
INBASE-CL
NBASE Current Limit
VNBASE = VVDD + 0.7V, ΔVVDD = −100 mV
5.8
10
mA
VNBASE = VVDD = 0V
20
Copyright © 2012–2013, Texas Instruments Incorporated
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