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PDF AX3504 Data sheet ( Hoja de datos )
| Número de pieza | AX3504 | |
| Descripción | 2A Synchronous Step-Down Converter | |
| Fabricantes | AXElite | |
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AX3504/A
1.2MHz, 2A Synchronous Step-Down Converter
GENERAL DESCRIPTION
The AX3504/A is a 1.2MHz constant frequency current mode PWM step-down converter. It
is ideal for portable equipment requiring very high current up to 2A from single-cell Lithium-ion
batteries while still achieving over 90% efficiency during peak load conditions. The AX3504/A
also can run at 100% duty cycle for low dropout operation, extending battery life in portable
systems while light load operation provides very low output ripple for noise sensitive applications.
The AX3504/A can supply up to 2A output load current from a 2.5V to 5.5V input voltage and the
output voltage can be regulated as low as 0.6V. The high switching frequency minimizes the
size of external components while keeping switching losses low. The internal slope
compensation setting allows the device to operate with smaller inductor values to optimize size
and provide efficient operation. The AX3504/A is available in adjustable (0.6V to VIN) output
voltage. The device is available in SOP8 Pb-free and DFN-10L packages.
FEATURES
- 2.5V to 5.5V Input Voltage Range
- Output Voltages from 0.6V to VIN
- High Efficiency: Up to 95%
- 1.2MHz Constant Frequency Operation
- 2A Output Current
- No Schottky Diode Required
- Low RDS(ON) Internal Switches: 0.15Ω
- Current Mode Operation for Excellent Line and Load Transient Response
- Current limit, Enable function
- Short Circuit Protect (SCP)
- Build-in Soft Start function
- ≤ 1µA Shutdown Current
- SOP8 Pb-Free and DFN-10L packages
AXElite Confidential Materials, do not copy or distribute without written consent .
www.gofotech.com Tel: 0755-61358292
1/10
Rev.0.4 May.16, 2008
1 page  
AX3504/A
Application Circuit
VIN=2.5 to 5.5V
C1
22u
U1
2 PVIN
3 SVIN
1 EN
SW
FB
7
5
L1
2.5uH
R1
4,6 SGND PGND 8
600K
AX3504
R2
300K
Vout = 0.6 * (1+R1/R2)
R2=50K~330K
Vout=1.8V
C5
22p C2
22u
Function Descriptions
Operation
AX3504/A is a monolithic switching mode Step-Down DC-DC converter. It utilizes
internal MOSFETs to achieve high efficiency and can generate very low output voltage by
using internal reference at 0.6V. It operates at a fixed switching frequency, and uses the
slope compensated current mode architecture. This Step-Down DC-DC Converter supplies
2000mA output current at input voltage range from 2.5V to 5.5V.
Current Mode PWM Control
Slope compensated current mode PWM control provides stable switching and
cycle-by-cycle current limit for excellent load and line responses and protection of the internal
main switch (P-CH MOSFET) and synchronous rectifier (N-CH MOSFET). During normal
operation, the internal P-CH MOSFET is turned on for a certain time to ramp the inductor
current at each rising edge of the internal oscillator, and switched off when the peak inductor
current is above the error voltage. The current comparator, ICOMP, limits the peak inductor
current. When the main switch is off, the synchronous rectifier will be turned on immediately
and stay on until either the inductor current starts to reverse, as indicated by the current
reversal comparator, IZERO, or the beginning of the next clock cycle. The OVDET comparator
controls output transient overshoots by turning the main switch off and keeping it off until the
fault is no longer present.
AXElite Confidential Materials, do not copy or distribute without written consent .
www.gofotech.com Tel: 0755-61358292
5/10
Rev.0.4 May.16, 2008
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet AX3504.PDF ] | |
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