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PDF PS5005 Data sheet ( Hoja de datos )
| Número de pieza | PS5005 | |
| Descripción | Step-up DC/DC Converter | |
| Fabricantes | CHIPLINK | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de PS5005 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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PS5005
High Efficiency, Low Voltage
Step-up DC/DC Converter
GENERAL DESCRIPTION
The PS5005 is a compact, high efficiency, and low voltage step-up DC/DC converter
with an Adaptive Current Mode PWM control loop. It comprises of an error amplifier, a ramp generator, a
PWM comparator, a switch pass element and the driver. It provides stable and high
efficient operation over a wide range of load currents without external compensation. The below 1V
start-up input voltage makes PS5005 suitable for single battery cell applications. The
built-in power transistor is able to provide up to 300mA output current while working
under Li-Battery Supply. Besides, it provides extra pin to drive external power devices (NMOS or NPN )
in case higher output current is needed. The output voltage is set with two external resistors. The 500KHz
high switching rate reduces the size of external components. Besides, the 14µA low quiescent current
together with high efficiency maintains long battery lifetime.
FEATURES
● Low Quiescent (Switch-off) Supply Current: 14µA
● Low Start-up Input Voltage: typical 0.8V
● High Supply Capability: Deliver 3.3V 100mA with 1Alkaline Cell; 5V 300mA with 1 Li-Cell
● Zero Shutdown Mode Supply Current
● High efficiency: 90%
● Fixed switching frequency: 500KHz
● Options for internal or external power switches
● Package type: SOT-26, SOT-89-5
APPLICATIONS
MP3, PDA, Electronic Dictionary, DSC, LCD, RF-Tag, Portable Devices, Wireless Devices, etc.
PIN ASSIGNMENT
1
1 page  
PS5005
Note:Cc for better Stability
APPLICATION DESIGN GUIDELINES
1) Output Voltage Setting
Referring to Typical Application Circuit 1, the output voltage of switching regulator (Vout) is set with
following equation:
Vout=(1+R1/R2)*Vfb
2) Feedback Loop Design
Referring to Typical Application Circuit 1 again, the selection of R1 and R2 is a trade-off between
quiescent current consumption and interference immunity besides abiding by the above equation.
● Higher R reduces quiescent current ( I=1.25V/R2 )
● Lower R gives better interference immunity, and is less sensitive to interference, layout
parasitic, FB node leakage, and improper probing to FB pin.
Hence for applications without standby or suspend modes lower R1 and R2 values are preferred, while
for applications concerning the current consumption in standby or suspend modes, higher values of R1
and R2 are needed. Such high impedance feedback loop is sensitive to any interference, which
requires careful PCB layout and avoid any interference, especially to FB pin.To improve the system
stability, a proper value capacitor between FB pin and Vout is suggested. An empirical suggestion is
around 100pF for MΩ feedback resistors and 10nF～0.1uF for lower R values.
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet PS5005.PDF ] | |
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