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PDF LM3754 Data sheet ( Hoja de datos )
| Número de pieza | LM3754 | |
| Descripción | Scalable 2-Phase Synchronous Buck Controllers | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM3754 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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LM3753/54
December 14, 2009
Scalable 2-Phase Synchronous Buck Controllers with
Integrated FET Drivers and Linear Regulator Controller
General Description
The LM3753 and LM3754 are full featured single-output dual-
phase voltage-mode synchronous PWM buck controllers.
They can be configured to control from 2 to 12 interleaved
power stages creating a single high power output. Both con-
trollers utilize voltage-mode control with input voltage feed-
forward for high noise immunity. An internal average current
loop forces real time current sharing between phases during
load transients.
The LM3753 supports a Tracking function, while the LM3754
supports adjustable Soft-Start. The LM3753 Tracking is al-
ways enabled, so the output is controlled both up and down.
The Soft-Start function on the LM3754 can only drive the out-
put upwards – it will not pull it down, therefore, pre-biased
loads will not be discharged. Available in the 5 mm x 5 mm
thermally enhanced 32-lead LLP package with a thermal pad.
Features
■ Wide input voltage range of 4.5V to 18V
■ Up to 12 channels for 300A load
■ System accuracy better than 1%
■ 0.6V to 3.6V output voltage range
■ Switching frequency from 200 kHz to 1 MHz
■ Phase current sharing ±12% max over temperature
■ Integrated 4.35V ±2.3% LDO
■ Inductor DCR or sense resistor current sensing
■ Interleaved switching for low I/O ripple current
■ Integrated synchronous NFET drivers
■ Programmable Soft-Start (LM3754) or Tracking (LM3753)
■ Pre-biased startup (LM3754)
■ Output voltage differential remote sensing
■ Minimum controllable on-time of only 50 ns
■ Programmable Enable and input UVLO
■ Power Good flag
■ OVP, UVP and hiccup over-current protection
Applications
■ CPUs, GPUs (graphic cards), ASICs, FPGAs, Large
Memory Arrays, DDR
■ High Current POL Converters
■ Networking Systems
■ Power Distribution Systems
■ Telecom/Datacom DC/DC Converters
■ Desktops, Servers and Workstations
Simplified Application
© 2009 National Semiconductor Corporation 300919
30091901
www.national.com
1 page  
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to SGND, PGND
SGND to PGND
VCC and VDD to VIN
VDD to PGND
PGOOD, FAULT to SGND
VCC, EN, SS, TRACK,
SYNC, CS1, CS2, CSM,
ILIM, SNSM, SNSP to SGND
FREQ, PH, FB to SGND
BOOT1, BOOT2 to PGND
(Note 2)
SW1, SW2 to PGND
(Note 2)
BOOT1 to SW1,
BOOT2 to SW2 (Note 2)
SYNCOUT
PGOOD, FAULT
VDIF
COMP
ESD Rating
HBM (Note 3)
−0.3V to 24V
−0.3V to 0.3V
+0.3V
−0.3V to 6V
−0.3V to 6V
−0.3V to 6V
−0.3 to VCC + 0.3V
−0.3V to 24V Peak
−0.3VDC to 24V Peak
−3V for less than 40 ns
−0.3V to 6.0V Peak
±20 mA
±20 mA
±5 mA
±4 mA
2 kV
Junction Temperature
(TJ-MAX)
Storage Temperature Range
+150°C
−65°C to +150°C
Operating Ratings (Note 1)
VIN Low Range
VIN High Range when using
integrated VCC LDO
VIN High Range when using
integrated VDD linear
regulator controller
VCC External Supply Voltage
VDD External Supply Voltage
Output Voltage Range
TRACK
SYNC, EN
SNSM
SNSP to SNSM
IAVE
CS1 and CS2 to CSM
CS1, CS2, ILIM and CSM to
SGND
ILIM to CSM
Junction Temperature Range
Thermal Data
Junction-to-Ambient Thermal
Resistance (θJA), LLP-32
Package (Note 4)
4.5V to 5.5V
5.5V to 18V
6V to 18V
4.5V to 5.5V
4.5V to 5.5V
0.6V to 3.6V
0V to 5V
0V to 5.5V
−0.25V to 1.0V
0V to 3.6V
0V to 1.15V
−15 mV to 45 mV
0V to 3.6V
0V to 200 mV
−5°C to +125°C
26.4°C/W
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 guaranteed 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 = VTRACK = 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
Includes trimmed EA and diff
VOUT = 2.5V
amplifier offset and gain errors; 0.5
mA load at VDIF
VOUT = 1.8V
VOUT = 0.6V
Phase Current Equalization
–0.65
–0.75
–0.9
–2.25
–0.11
–0.134
–0.165
–0.4
0.45
0.6
0.7
1.25
%
%
%
%
ΔIPH
Current Equalization (from average VCSM = 1.8V, VCS1 = VCS2 = VCSM + 30 mV,
per phase current)
VIAVE = 740 mV, VCOMP = 1.9V
System Supplies and UVLO
–12
12 %
VIN
IVIN
IVIN-Q
VIN Operating Current
VIN Quiescent Current
2-phase switching gate drivers unloaded
VFB = 650 mV, no PWM switching, NBASE
is floating (no NPN)
15 mA
9 18 mA
IVIN-SD
VIN Shutdown Current
VEN = 0V
200 450 µA
5 www.national.com
5 Page 
Typical Performance Characteristics
System Accuracy vs VOUT
fSW vs Temperature
VREF Deviation
30091904
RFRQ vs fSW
30091907
VREF vs Temperature
30091905
Load Step (High Slew)
30091908
30091906
11
30091909
www.national.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LM3754.PDF ] | |
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