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PDF APS2406ES5-ADJ Data sheet ( Hoja de datos )
| Número de pieza | APS2406ES5-ADJ | |
| Descripción | Synchronous Step-Down Converter | |
| Fabricantes | Chipown | |
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APS2406
Chipown
1.5MHz, 800mA
Synchronous Step-Down Converter
Description
The APS2406 is a high efficiency monolithic
synchronous buck regulator using a constant frequency,
current mode architecture. The device is available in an
adjustable version and fixed output voltages, such as
1.2V, 1.5V, 1.8V, etc. Supply current with no load is
300uA and drops to <1uA in shutdown. The 2.5V to
6.5V input voltage range makes the APS2406 ideally
suited for single Li-Ion, two to four AA battery-powered
applications. 100% duty cycle provides low dropout
operation, extending battery life in portable systems.
PWM pulse skipping mode operation provides very low
output ripple voltage for noise sensitive applications.
Switching frequency is internally set at 1.5MHz,
allowing the use of small surface mount inductors and
capacitors. The internal synchronous switch increases
efficiency and eliminates the need for an external
Schottky diode. Low output voltages are easily
supported with the 0.6V feedback reference voltage. The
APS2406 is available in a small SOT package.
Applications
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
Wireless and DSL Modems
PDAs
MP3 / MP4 /PMP Player
Digital Still and Video Cameras
Portable Instruments
Features
High Efficiency: Up to 96%
1.5MHz Constant Switching Frequency
800mA Output Current at VIN=3V
Integrated Main switch and synchronous rectifier.
No Schottky Diode Required
2.5V to 6.5V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Quiescent Current: 300µA(input < 4.2V)
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Short Circuit Protection
<1uA Shutdown Current
Soft start
Space Saving 5-Pin SOT23 package
Typical Application Circuit
100
90
80
70
60
50
40
30
20
10
0
1
η vs Io(VO=1.8V)
VIN=3.6V
VIN=4.2V
VIN=5.0V
VIN=6.0V
10
100
1000
10000
Io(mA)
Figure 1. Basic Application Circuit with
APS2406 adjustable version
Figure 2. Typical Efficiency Curve
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New District Tel: +86(510)8521-7718 http://www.chipown.com.cn
1
1 page  
APS2406
Chipown
VFB (APS2406): Feedback Input Pin. Connect FB to the center point of the external resistor
5
VFB/VOUT
divider. The feedback threshold voltage is 0.6V.
VOUT (APS2406-1.2/APS2406-1.8): Output Voltage Feedback Pin. An internal resistive
divider divides the output voltage down for comparison to the internal reference voltage.
Functional Block Diagram
Figure 3. APS2406 Block Diagram
Operation
APS2406 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 800mA output
current at Vout = 1.8V with input voltage range from
2.5V to 6.5V.
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.
Idle Mode Operation
At very light loads, the APS2406 automatically enters
pulse skipping Mode. In the pulse skipping Mode, the
inductor current may reach zero or reverse on each pulse.
The PWM control loop will automatically skip pulses to
maintain output regulation. The bottom MOSFET is
turned off by the current reversal comparator, IZERO, and
the switch voltage will ring. This is discontinuous
mode operation, and is normal behavior for the
switching regulator.
Dropout Operation
When the input voltage decreases toward the value of
the output voltage, the APS2406 allows the main switch
to remain on for more than one switching cycle and
increases the duty cycle (Note 5) until it reaches 100%.
The output voltage then is the input voltage minus the
voltage drop across the main switch and the inductor.
At low input supply voltage, the RDS(ON) of the
P-Channel MOSFET increases, and the efficiency of the
8/F, ChuangYuan Building No.21-1 Changjiang Road, Wuxi New District Tel: +86(510)8521-7718 http://www.chipown.com.cn
5
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet APS2406ES5-ADJ.PDF ] | |
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