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PDF A7106 Data sheet ( Hoja de datos )
| Número de pieza | A7106 | |
| Descripción | 600mA 1.5MHz CONSTANT FREQUENCY CURRENT MODE PWM STEP-DOWN DC-DC CONVERTER | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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AiT Semiconductor Inc.
www.ait-ic.com
A7106
600mA, 1.5MHz CONSTANT FREQUENCY
CURRENT MODE PWM STEP-DOWN DC-DC CONVERTER
DESCRIPTION
The A7106 is a constant frequency, 1.5MHz, slope
compensated current mode PWM step-down
converter working under an input voltage range of
2.5V to 5.5V. This feature makes the A7108 suitable
for single cell Li-ion battery-powered applications. The
internal synchronous rectifier is desired to increase
efficiency without an external Schottky diode. 100%
duty cycle capability extends battery life in portable
devices, while the quiescent current is 180μA at no
load, and drops to < 1μA in shutdown. Pulse Skipping
Mode operation increases efficiency at light loads,
further extending battery life.
The A7106 is available in an adjustable version and
fixed output versions of 1.2V and 1.8V.
FEATURES
High Efficiency: Up to 96%
1.5MHz Constant Switching Frequency
Current Mode Operation for Excellent
Line and Load Transient Response
No Schottky Diode Required
2.5V to 5.5V Input Voltage Range
1.2V & 1.8V Fixed/Adjustable Output Voltage
100% Duty Cycle in Dropout Mode
Low Quiescent Current: 180μA
Over temperature Protection
Short Circuit Protection
Shutdown Quiescent Current < 1μA
Available in SOT-25 package
The A7106 is available in SOT-25 Package.
ORDERING INFORMATION
Package
Part Number
Type
SOT-25
E5
A7106E5R-XXZ
A7106E5VR-XXZ
XX: Output Voltage
18=1.8V,ADJ=Adjustable
Note
Z: Pin Type
R: Tape & Reel
V: Halogen free Package
AiT provides all RoHS products
Suffix “V” means Halogen free Package
APPLICATION
Cellular and Smart Phones
Wireless Handsets and DSL Modems
Microprocessors and DSP Core Supplies
PDAs
Digital Still and Video Cameras
MP3/MP4/MP5 Players
Portable Instruments
GPS Receivers
TYPICAL APPLICATION
REV1.3
- SEP2006 RELEASED – DEC 2011 REVISED -
Figure 1 A7106-ADJ Typical Application Circuit
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A7106
600mA, 1.5MHz CONSTANT FREQUENCY
CURRENT MODE PWM STEP-DOWN DC-DC CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
1. Efficiency vs. Output Current
2. Output Voltage vs. Load Current
3. Reference Voltage vs. Temperature
4. Output Voltage vs. Input Voltage
5. Supply Current vs. Supply Voltage
6. Start-up from Shutdown
REV1.3
- SEP2006 RELEASED – DEC 2011 REVISED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
A7106
600mA, 1.5MHz CONSTANT FREQUENCY
CURRENT MODE PWM STEP-DOWN DC-DC CONVERTER
Inductor Selection
The output inductor is selected to limit the ripple current to some predetermined value, typically 20%~40% of
the full load current at the maximum input voltage. In continuous mode, the ripple current is determined by:
A reasonable starting point for setting ripple current is ΔIL=320mA (40% of 600mA). For output voltages
above 2.0V, when efficiency at light load condition is important, the minimum recommended inductor is 2.2μH.
For optimum voltage-positioning load transients, choose an inductor with DC series resistance below 150mΩ.
For higher efficiency at heavy loads (above 200mA), or minimal load regulation (but some transient
overshoot), the resistance should be kept below 100mΩ. The DC current rating of the inductor should be at
least equal to the maximum load current plus half the ripple current to prevent core saturation. Thus, a
1120mA rated inductor should be enough for most applications (600mA+320mA).
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching noise from the device. The
input capacitor impedance at the switching frequency shall be less than input source impedance to prevent
high frequency switching current passing to the input. In continuous mode, the source current of the main
switch is a square wave of duty cycle VOUT/VIN. To prevent large voltage transients, a low ESR input capacitor
sized for the maximum RMS current must be used. The maximum RMS capacitor current is given by:
This formula has a maximum at VIN =2VOUT, where IRMS = IOUT/2. This simple worst-case condition is
commonly used for design because even significant deviations do not offer much relief. Ceramic capacitors
with X5R or X7R dielectrics are recommended due to their low ESR and high ripple current.
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability.
The output capacitor must have low impedance at the switching frequency. Ceramic capacitors with X5R or
X7R dielectrics are recommended due to their low ESR and high ripple current. The output ripple ΔVOUT is
determined by:
REV1.3
- SEP2006 RELEASED – DEC 2011 REVISED -
- 11 -
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet A7106.PDF ] | |
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