|
|
PDF PT1206 Data sheet ( Hoja de datos )
| Número de pieza | PT1206 | |
| Descripción | 1A Synchronous Step Down Regulator | |
| Fabricantes | Powtech | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de PT1206 (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
|
No Preview Available !
PT1206
High Efficiency 1.5MHz, 1A
Synchronous Step Down Regulator
GENERAL DESCRIPTION
The PT1206 is a high efficiency 1.5MHz
synchronous step-down DC-DC regulator IC capable
of delivering up to 1A current. The PT1206 operates
over a wide input voltage range from 2.5V to 6V; the
main switch and the synchronous switch have been
integrated with very low RDS(ON) to minimize the
conduction loss.
Low output voltage ripples with small external
inductor and capacitor size are achieved with
1.5MHz switching frequency.
FEATURES
Low RDS(ON) for internal switches (top/bottom)
250mΩ/200mΩ
2.5V~6.0V input voltage range
1.5MHz switching frequency minimizes the
external components
Internal soft-start limits the inrush current
100% duty-cycle operation
RoHS compliant
APPLICATIONS
Portable Navigation Device
Smart phone
USB Dongle
Set Top Box
Media Player
ORDERING INFORMATION
PACKAGE
SOT23-5
TEMPERATURE
RANGE
-40°C to 85°C
ORDERING PART
NUMBER
PT1206E23F
TRANSPORT
MEDIA
Tape and Reel
3000 units
MARKING
1206
TYPICAL APPLICATION CIRCUIT
ON/OFF
VIN
CIN
EN
IN LX
PT1206
FB
GND
L
R1
R2
VOUT
C1(opt.)
COUT
China Resources Powtech (Shanghai) Limited
PT1206_DS Rev EN_1.1
WWW.CRPOWTECH.COM
Page 1
1 page  
PT1206
High Efficiency 1.5MHz, 1A
Synchronous Step Down Regulator
OPERATION DESCRIPTION
PT1206 is a synchronous buck regulator IC that
integrates the PWM control, top and bottom
switches on the same die to minimize the switching
transition loss and conduction loss. With ultra low
RDS(ON) power switches and proprietary PWM
control, this regulator IC can achieve the highest
efficiency and the highest switch frequency
simultaneously to minimize the external inductor
and capacitor size, and thus achieving the
minimum solution footprint. The internal softstart
time is about 1ms.
APPLICATION INFORMATION
Output Voltage Programming
Choose R1 and R2 to program the proper output
voltage. To minimize the power consumption under
light loads, it is desirable to choose large
resistance values for both R1 and R2. A value of
between 100kΩ and 1MΩ is highly recommended
for both resistors. If R2=120kΩ is chosen, then R1
can be calculated to be:
R1
VOUT
0.6 R2
0.6
Input Capacitor Selection
With the maximum load current at 2A, the
maximum ripple current through input capacitor is
about 0.6A-rms. A typical X7R or better grade
ceramic capacitor with 6V rating and greater than
4.7µF capacitance can handle this ripple current
well. In order to minimize the potential noise
problem, this ceramic capacitor need to be placed
really close to the IN and GND pins. Care should
be taken to minimize the loop area formed by CIN,
and IN/GND pins.
Output Capacitor Selection
The output capacitor is selected to handle the
output ripple noise requirements. Both steady state
ripple and transient requirements must be taken
into consideration when selecting this capacitor.
For the best performance, it is recommended to
use X7R or better grade ceramic capacitor with 6V
rating and greater than 10µF capacitance.
Inductor Selection
There are several considerations in choosing this
inductor.
1) Choose the inductance to provide the desired
ripple current. It is suggested to choose the ripple
current to be about 40% of the maximum output
current. The inductance is calculated as:
L VOUT 1 VOUT /VIN ,MAX
F ISW OUT ,MAX 40%
Where Fsw is the switching frequency and IOUT,
max is the maximum load current.
The PT1206 regulator IC is quite tolerant to
different ripple current amplitude. Consequently,
the final selection of inductance can be slightly off
with the calculated value without significantly
impact to the performance.
2) The saturation current rating of the inductor
must be selected to be greater than the peak
inductor current under full load conditions.
ISAT,MIN
IOUT ,MAX
VOUT
1 VOUT /VIN ,MAX
2 FSW L
3) The DCR of the inductor and the core loss at the
switching frequency must be low enough to
achieve the target efficiency requirement. It is
desirable to choose an inductor with DCR<50mΩ
to achieve a good overall efficiency.
Layout Design
The layout design of PT1206 regulator is relatively
simple. For the best efficiency and minimum noise
China Resources Powtech (Shanghai) Limited
PT1206_DS Rev EN_1.1
WWW.CRPOWTECH.COM
Page 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet PT1206.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| PT1202 | 600mA Synchronous Step-Down DC-DC Converter | Powtech |
| PT1202E23E-ADJ | 600mA Synchronous Step-Down DC-DC Converter | Powtech |
| PT1203 | Synchronous Step-Down Converter | Powtech |
| PT1203EESH | Synchronous Step-Down Converter | Powtech |
| 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 |