|
|
PDF L6920DB Data sheet ( Hoja de datos )
| Número de pieza | L6920DB | |
| Descripción | Synchronous rectifier step up converter | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de L6920DB (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
L6920DB
Synchronous rectifier step up converter
General features
■ 0.8V start up input voltage
■ Up to 5.5V operating input voltage
■ Internal synchronous rectifier
■ Adjustable output voltage from 1.8V
■ 3.3V and 5V fixed output voltages
■ Low battery voltage detection
■ Reverse battery protection
■ 750mA input current limit
■ Switching frequency up to 1MHz
■ 1.23V reference voltage available
Applications
■ Conversion from 1 to 3 alkaline,
■ NiMH, NiCd battery cells or 1 lithium ION
■ PDA and handheld instruments
■ Digital cameras
■ Cellular phones
■ GPS
■ Distributed power
Application circuit
MSOP8
Description
The L6920DB is a high efficiency monolithic step
up switching converter IC especially designed for
battery powered application.
Package is MSOP8 in order to minimize PCB
space. It requires only three external components
to realize the conversion from the battery voltage
to the selected output voltage.
The minimum output voltage is 1.8V: suitable to
supply the most advanced ASIC and µP.
High switching frequency allows for a low profile,
small sized inductor and output capacitor to be
used.
Reference voltage, low battery detection and
Shutdown are provided together with over current.
L6920DB
3.3V
October 2006
Rev 5
1/16
www.st.com
16
1 page  
L6920DB
3 Electrical characteristics
Electrical characteristics
Table 4. Electrical characteristcs
(VIN = 2V, FB = GND, TJ = 25°C unless otherwise specified)
Symbol
Parameter
Test condition
Min Typ Max Unit
VCC Section
VIN
Minimum Start Up Input
Voltage
Iq Quiescent Current
Isd Shut Down Current
Irev Reverse battery current
Vout = 3.3V
Il = 0 mA, FB = 1.4V, Vout = 3.3V
LBI = SHDN = 2V
Il = 0 mA, FB = 1.4V, Vout = 5V
LBI = SHDN = 2V
Vin = 5V, Il = 0 mA
Vin = -4V
0.8 V
9 12 µA
11 15 µA
0.1 1 µA
0.1 1 µA
Power section
Ron-N
Ron-P
Active switch ON resistance
Synchronous switch ON
resistance
300 mΩ
300 mΩ
Control section
Vout Output voltage
Output voltage range
VLBI LBI threshold
VLBO LBO logic LOW
Ilim LX switch current limit
Tonmax Maximum on time
Toffmin Minimum off time
SHDN SHDN logic LOW
SHDN logic HIGH
Vref Reference Voltage
FB = OUT, Il = 0 mA
FB = GND, Il = 0 mA
External divider
Isink = 1mA
Vout = 3.3V
Vout = 3.3V
3.2 3.3 3.4
4.9 5 5.1
1.8 5.2
1.23
0.2 0.4
0.7 0.8 0.9
3.75 5 6.25
0.75 1 1.25
0.2
0.6
1.18 1.23 1.27
V
V
V
V
V
A
µs
µs
V
V
V
5/16
5 Page 
L6920DB
Detailed description
Table 5. Output voltage connection
Vout = 3.3V
FB pin connected to OUT (see application circuit)
Vout = 5V
FB pin connected to GND
1.8V < Vout < 5.5V FB pin connected to a resistive divider Vout = 1.23V ⋅ ⎝⎛1 + RR-----45--⎠⎞
Figure 9. Test circuit
VBATT=1.5V
C2
47µF
R1 R2
VBATT
L1 10µH
LBI _____
2 SHDN
75
VOUT
8
C4
100nF
L6920DB
VREF
L6920DB
4
___
LBO
3
6
GND
1 FB
R3
R4
200KΩ
R5
200KΩ
VOUT=2.5V
C1
47µF
11/16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet L6920DB.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| L6920D | 1V HIGH EFFICIENCY SYNCRONOUS STEP UP CONVERTER | STMicroelectronics |
| L6920DB | Synchronous rectifier step up converter | STMicroelectronics |
| L6920DC | Synchronous rectifier step up converter | STMicroelectronics |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |