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PDF A7116 Data sheet ( Hoja de datos )
| Número de pieza | A7116 | |
| Descripción | 1.5MHz 700mA Synchronous Step-Down Converter | |
| Fabricantes | AiT Semiconductor | |
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AiT Semiconductor Inc.
www.ait-ic.com
A7116
1.5MHz, 700mA Synchronous
Step-Down Converter with Low Quiescent Current
DESCRIPTION
The A7116 is a high efficiency monolithic
synchronous buck regulator using a constant
frequency, current mode architecture.
The A7116 is available in an adjustable version and
fixed output voltages, such as 1.2V, 1.8V, etc.
Supply current with no load is 40uA and drops to
<1uA in shutdown. The 2.5V to 6.5V input voltage
range makes the A7116 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. In power
saving mode, 40uA quiescent current is very
suitable for DSP/MCU in standby operation; and in
PWM mode, low output ripple voltage is good
enough for noise sensitive applications. The two
modes can be automatically switched according to
the load current.
FEATURES
High Efficiency: Up to 96%
1.5MHz Constant Switching Frequency
700mA Output Current at VIN=3.6V
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: 40µA(input < 4.2V)
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Short Circuit Protection
<1uA Shutdown Current
Available in SOT25 package
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 SOT
package.
APPLICATION
Wireless and DSL Modems
PDAs
MP3 / MP4 /MPM Player
Digital Still and Video Cameras
Portable Instruments
The A7116 is available in SOT-25 Package.
ORDER INFORMATION
Typical Application Circuit
Package Type
Part Number
SOT-25
Note
E5
A7116E5R-XXY
A7116E5VR-XXY
XX=Output
12=1.2V, 18=1.8V,33=3.3V
ADJ=Adjustable
V: Green Package
R : Tape & Reel
Y: Pin Type A or B
AiT provides all Pb free products
Suffix “ V “ means Green Package
A7116-ADJ
REV1.1
- JAN 2009 RELEASED, JAN 2011 REVISED -
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A7116
1.5MHz, 700mA Synchronous
Step-Down Converter with Low Quiescent Current
TYPICAL PERFORMANCE CHARACTERISTICS
1. Efficiency vs. IOUT
VOUT=1.2V, TA=25℃
2. Efficiency vs. IOUT
VOUT=2.5V, TA=25℃
3. Efficiency vs. IOUT
VOUT=1.5V, TA=25℃
4. Efficiency vs. IOUT
VOUT=1.8V, TA=25℃
5. VOUT vs. IOUT
VOUT=1.8V, TA=25℃
6. VOUT vs. VIN
VOUT=2.5V, TA=25℃
REV1.1
- JAN 2009 RELEASED, JAN 2011 REVISED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
A7116
1.5MHz, 700mA Synchronous
Step-Down Converter with Low Quiescent Current
Setting the Output Voltage
Figure 1 above shows the basic application circuit with A7116 adjustable output version. The external
resistor sets the output voltage according to the following equation:
VOUT
= 0.6V
× 1 +
R2
R1
R1= 200KΩ for all outputs; R2= 200kΩ for VOUT=1.2V, R2=300kΩ for VOUT =1.5V, R2=400kΩ for VOUT =1.8V,
and R2=900kΩ for VOUT =3.3V.
Inductor Selection
For most designs, the A7116 operates with inductors of 1µH to 4.7µH. Low inductance values are physically
smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived
from the following equation:
( )L = VOUT × VIN − VOUT
VIN × ∆I L × fOSC
Where ∆I L is inductor Ripple Current. Large value inductors lower ripple current and small value inductors
result in high ripple currents. Choose inductor ripple current approximately 35% of the maximum load current
700mA, or ∆I L =245mA.
For output voltages above 2.0V, when light-load efficiency is important, the minimum recommended inductor
is 2.2µH. For optimum voltage-positioning load transients, choose an inductor with DC series resistance in the
50mΩ to 150mΩ range. 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 (600mA+105mA). Table 1 lists some typical surface mount inductors that meet target applications
for the A7116.
REV1.1
- JAN 2009 RELEASED, JAN 2011 REVISED -
- 11 -
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet A7116.PDF ] | |
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