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PDF AAT1346A Data sheet ( Hoja de datos )
| Número de pieza | AAT1346A | |
| Descripción | 2A 15V Step-Down DC-DC Converter | |
| Fabricantes | Advanced Analog Technology | |
| Logotipo |  |
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Advanced Analog Technology, Inc.
June 2008
AAT1346A/B/C
Product information presented is for internal use within AAT Inc. only. Details are subject to change without notice
2A 15V Step-Down DC-DC Converter
FEATURES
Buck PWM with Internal PMOS
4.5V to 15.0V Input Voltage Range
Max. 2A Output Current
Under-Voltage Lockout (UVLO) Protection
Internal Short Circuit and Thermal Protection
Internal Soft-Start
Fixed Switching Frequency (380kHz / 47kHz)
2 µA Shutdown Current
SOP- 8 Package
PIN CONFIGURATION
GENERAL DESCRIPTION
The AAT1346A/B/C is a 2A 15V step-down converter,
which provides an integrated one-channel PWM
solution for the power supply of DC-DC system. It
offers system engineers the flexibility to tailor-make the
power supply circuitry for specific applications.
The buck PWM contains enable control signal, error
amplifier, PWM comparator, output driver,
under-voltage protection, oscillator, short circuit
protection and voltage reference circuit.
The AAT1346A/B/C contains one buck current mode
PWM with internal PMOS. In addition, a digital
soft-start is also included to prevent inrush current at
startup. AAT1346A/B/C comes with a fixed 380kHz
oscillator, however, when the feedback voltage is lower
than 0.7V, the switching frequency changes to 47kHz
and returns to 380kHz after the short-circuit is
released.
TYPICAL APPLICATION
Power In
VDD
EO SW
VOUT
ENC
IN
ENC
GND
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Version 1.00
Page 1 of 12
1 page  
Advanced Analog Technology, Inc.
TYPICAL OPERATING CHARACTERISTICS
( VIN =12V, TC =25 C Unless Otherwise Noted)
AAT1346A
June 2008
AAT1346A/B/C
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Version 1.00
Page 5 of 12
5 Page 
Advanced Analog Technology, Inc.
June 2008
AAT1346A/B/C
threshold voltage (1.222V).
If the value calculated for RC is greater than 100 kΩ ,
100 kΩ is recommend.
Choose the compensation capacitor CC to set the
zero to 1/4 of the crossover frequency.
CC
<
COUT × VOUT
4 ×RC
If the output filter capacitor Cout has significant ESR,
a zero occurs at the following:
ZESR
=
1
2π × COUT
× RESR
LAYOUT CONSIDERATIONS
Conductors carrying discontinuous currents and any
high-current path should be made as short and wide as
possible. The compensation network should be very
close to the EO pin and avoid through VIA. The IC
must be bypassed with a 0.22 µF ceramic capacitor
placed close to the VDD. Tie the feedback resistor
divider to be very close to output capacitor and far
away from the inductor or Schottky diode. Keep the
feedback network IN close to the IC. Switching nodes
(SW) should be kept as small as possible and should
be routed away from high-impedance nodes such as
IN.
If ZESR > fC /4, it can be ignored, as is typically the
case with ceramic output capacitors. If ZESR < fC /4,
it should be cancelled with a pole set by capacitor Cp
connected from EO to GND:
CP
=
COUT × RESR
RC
If Cp is calculated to be <10pF, it can be omitted.
– 台灣類比科技股份有限公司 –
– Advanced Analog Technology, Inc. –
Version 1.00
Page 11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AAT1346A.PDF ] | |
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