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PDF LM2853 Data sheet ( Hoja de datos )
| Número de pieza | LM2853 | |
| Descripción | synchronous SIMPLE SWITCHER buck regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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October 2006
LM2853
3A 550 kHz Synchronous SIMPLE SWITCHER® Buck
Regulator
General Description
The LM2853 synchronous SIMPLE SWITCHER® buck regu-
lator is a 550 kHz step-down switching voltage regulator
capable of driving up to a 3A load with excellent line and load
regulation. The LM2853 accepts an input voltage between
3.0V and 5.5V and delivers a customizable output voltage
that is factory programmable from 0.8V to 3.3V in 100mV
increments. Internal type-three compensation enables a low
component count solution and greatly simplifies external
component selection. The exposed-pad TSSOP-14 package
enhances the thermal performance of the LM2853.
Features
n Input voltage range of 3.0V to 5.5V
n Factory EEPROM set output voltages from 0.8V to 3.3V
in 100 mV increments
n Maximum load current of 3A
n Voltage Mode Control
n Internal type-three compensation
n Switching frequency of 550 kHz
n Low standby current of 12 µA
n Internal 40 mΩ MOSFET switches
n Standard voltage options
0.8/1.0/1.2/1.5/1.8/2.5/3.0/3.3 volts
n Exposed pad TSSOP-14 package
Applications
n Low voltage point of load regulation
n Local solution for FPGA/DSP/ASIC core power
n Broadband networking and communications
infrastructure
Typical Application Circuit
Efficiency vs Load Current (VOUT = 3.3V)
20201502
20201501
SIMPLE SWITCHER® is a Registered Trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS202015
www.national.com
1 page  
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Typical Performance Characteristics Unless otherwise specified, the following conditions apply: VIN
= AVIN = PVIN = 5V, TJ = 25˚C.
Efficiency vs. ILOAD
VOUT = 1.8V
NFET RDS(ON) vs. Temperature
Efficiency vs. ILOAD
VOUT = 2.5V
20201507
20201505
PFET RDS(ON) vs. Temperature
Efficiency vs. ILOAD
VOUT = 3.3V
20201509
20201504
Switching Frequency vs. Temperature
20201508
5
20201506
www.national.com
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LM2853 Example Circuit Schematic (Continued)
ID
U1
CIN
CBYP
CSS
LO
CO
Part Number
LM2853MH-3.3
GRM31CR60J476ME19
GRM21BR71C105KA01
VJ0805Y222KXXA
DO3316P-682
594D127X06R3C2T
Bill of Materials for 5V to 3.3V Conversion
Type
3A Buck
Capacitor
Capacitor
Capacitor
Inductor
Capacitor
Size
ETSSOP-14
1206
0805
0603
DO3316P
C Case
Parameters
3.3V
47 µF
1 µF
2.2 nF
6.8 µH
120µF
(85mΩ)
ID
U1
CIN
CBYP
CSS
LO
CO
Part Number
LM2853MH-1.2
GRM31CR60J476ME19
GRM21BR71C105KA01
VJ0805Y222KXXA
DO3316P-472
NOSD157M006R0070
Bill of Materials for 3.3V to 1.2V Conversion
Type
3A Buck
Capacitor
Capacitor
Capacitor
Inductor
Capacitor
Size
ETSSOP-14
1206
0805
0603
DO3316P
D Case
Parameters
1.2V
47 µF
1 µF
2.2 nF
4.7 µH
150 µF
(70 mΩ)
Qty Vendor
1 NSC
1 Murata
1 Murata
1 Vishay-Vitramon
1 Coilcraft
1 Vishay-Sprague
Qty Vendor
1 NSC
1 Murata
1 Murata
1 Vishay-Vitramon
1 Coilcraft
1 AVX
11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM2853.PDF ] | |
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