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PDF A7525 Data sheet ( Hoja de datos )
| Número de pieza | A7525 | |
| Descripción | SYNCHRONOUS STEP-UP DC-DC CONVERTER | |
| Fabricantes | AiT Semiconductor | |
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AiT Semiconductor Inc.
www.ait-ic.com
A7525
500mA, 1.2MHz HIGH EFFICIENCY
SYNCHRONOUS STEP-UP DC-DC CONVERTER
DESCRIPTION
The A7525 is synchronous, fixed frequency,
FEATURES
High Efficiency: Up to 92%
step-up DC/DC converters delivering high
1.2MHz Constant Switching Frequency
efficiency in a 6-lead SOT package. Capable of
3.3V Output Voltage at IOUT=100mA from a
supplying 3.3V at 100mA from a single AA cell
Single AA Cell; 5.0V Output Voltage at
input, the device contain an internal NMOS switch
IOUT=500mA from one Li battery.
and PMOS synchronous rectifier. A switching
Low Start-up Voltage: 1.0V
frequency of 1.2MHz minimizes solution footprint Integrated main switch and synchronous rectifier.
by allowing the use of tiny, low profile inductors
No Schottky Diode Required
and ceramic capacitors. The current mode PWM 2.5V to 5V Output Voltage Range
design is internally compensated, reducing
Automatic Pulse Skipping Mode Operation
external parts count.
Tiny External Components
<1μA Shutdown Current
The A7525 features continuous switching at light Anti-ringing Control Reduces EMI
loads. Anti-ringing control circuitry reduces EMI
Available in SOT-26 Package
concerns by damping the inductor in discontinuous
mode, and the device features low shutdown
current of under 1uA.
APPLICATION
PDA
DSC
A7525 is available in SOT-26 package.
LCD Panel
RF-Tags
ORDER INFORMATION
MP3
Portable Instrument
Package Type
Part Number
Wireless Equipment
SOT-26
A7525E6R-ADJ
E6
A7525E6VR-ADJ
Typical Application Circuit
Note
V: Green Package
R : Tape & Reel
AiT provides all Pb free products
Suffix “ V “ means Green Package
REV1.1
-MAR 2009 RELEASE – APR 2010 REVISED -
-1-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A7525
500mA, 1.2MHz HIGH EFFICIENCY
SYNCHRONOUS STEP-UP DC-DC CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
1. Efficiency vs. Output Current
VOUT=3.3V, TA = 25°C
2. Input current vs. Output current
VOUT=5.0V, TA = 25°C
3. Output Voltage vs. Output Current
VOUT=3.3V, TA = 25°C
4. Output Voltage vs. Output Current
VOUT=5.0V, TA = 25°C
5. Minimum Start-Up Voltage vs. Output Current
VOUT=3.3V, TA = 25°C
6. Maximum Output Current vs. Input Voltage
L=4.7uH, TA = 25°C
REV1.1
-MAR 2009 RELEASE – APR 2010 REVISED -
-5-
5 Page 
AiT Semiconductor Inc.
www.ait-ic.com
A7525
500mA, 1.2MHz HIGH EFFICIENCY
SYNCHRONOUS STEP-UP DC-DC CONVERTER
Input Capacitor Selection: The input capacitor reduces the surge current drawn from the input and switching
noise from the device. A minimum 4.7μF input capacitor is needed for most applications. The input capacitor
impedance at the switching frequency should be less than input source impedance to prevent high frequency
switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must be
used. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and
small temperature coefficients.
Output Diode Selection: An Shottky diode should be included when the output voltage is above 4.5V. The
Schottky diode is optional for the output voltage not more than 4.5V, but can improve efficiency by about 2%
to 3%.
PCB Layout Guidance
The A7525 operates at 1.2MHz typically. This is a considerably high frequency for DC-DC converters. In such
case PCB layout is important to guarantee satisfactory performance. It is recommended to make traces of the
power loop, especially where switching node is involved as short and wide as possible. First of all, the
inductor, input and output capacitor should be close to the device. Feedback and shut down circuit should
avoid the proximity of large AC signals, e.g. the power inductor and switching nodes. The optional rectifier
diode (D1) can improve efficiency and alleviate the stress on the integrated MOSFET. The diode should also
be close to the inductor and the chip to form the shortest possible switching loop. Large and integral multi
layer ground planes are ideal for high power applications. Large area of copper has lower resistance and
helps to dissipate heat on the device. The converter’s ground should join the system ground to which it
supplies power at one point only.
REV1.1
-MAR 2009 RELEASE – APR 2010 REVISED -
- 11 -
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet A7525.PDF ] | |
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