AAT1346 Advanced Analog Technology, Inc., AAT1346 Datasheet

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AAT1346

Manufacturer Part Number
AAT1346
Description
2a 15v Step-down Dc-dc Converter
Manufacturer
Advanced Analog Technology, Inc.
Datasheet

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Part Number
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Part Number:
AAT1346A
Manufacturer:
JRC
Quantity:
2 346
F F F F EATURES
PIN CONFIGURATION
PIN CONFIGURATION
PIN CONFIGURATION
PIN CONFIGURATION
Product information presented is for internal use within AAT Inc. only. Details are subject to change without notice
EATURES
EATURES
EATURES
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
Advanced Analog Technology, Inc.
2A 15V Step-Down DC-DC Converter
– 台 灣 類 比 科 技 股 份 有 限 公 司
Advanced Analog Technology, Inc. –
Version 1.00
Page 1 of 12
GENERAL DESCRIPTION
GENER
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,
under-voltage
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 A A A A PPLICATION
TYPICAL
GENER
GENER
TYPICAL
TYPICAL
Power In
ENC
AL DESCRIPTION
AL DESCRIPTION
AL DESCRIPTION
PWM
EO
ENC
protection,
PPLICATION
PPLICATION
PPLICATION
GND
V
comparator,
DD
SW
IN
oscillator,
AAT1346A/B/C
output
short
June 2008
driver,
VOUT
circuit

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AAT1346 Summary of contents

Page 1

... Step-Down DC-DC Converter GENERAL DESCRIPTION GENER GENER GENER The AAT1346A/B 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 ...

Page 2

... T: Tape +85 C S:SOP8 and reel – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc. – – Version 1.00 Page AAT1346A/B/C TEMP. MARKING RANGE DESCRIPTION AAT1346A Device Type Lot no.(6~9Digits) XXXXXX AAT1346B Device Type Lot no ...

Page 3

... 15V LSW LIMIT t SS – – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc . – – Version 1.00 Page June 2008 AAT1346A/B/C MIN TYP MAX UNIT 4.50 15.0 V 3.33 3.48 3.63 V 150 5.5 mA µ ...

Page 4

... Power Input I/O Switching Node - Ground I Feedback Input I/O Error Amplifier Compensation Output I Enable Control - Not Connected – – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc . – – Version 1.00 Page June 2008 AAT1346A/B/C FUNCITION ...

Page 5

... TYPICAL OPERATING CHARACTERISTICS TYPICAL OPERATING CHARACTERISTICS TYPICAL OPERATING CHARACTERISTICS ( V =12V, T =25 C Unless Otherwise Noted AAT1346A – – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc . – – Version 1.00 Page June 2008 AAT1346A/B/C ...

Page 6

... TYPICAL OPERATING CHARACTERI ( V =12V, T =25 C Unless Otherwise Noted STICS (CONT STICS (C STICS (C – – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc . – – Version 1.00 Page AAT1346A/B/C ONT ONT ONT June 2008 ...

Page 7

... TYPICAL OPERATING CHARACTERISTICS (C TYPICAL OPERATING CHARACTERISTICS ( =12V, T =25 C Unless Otherwise Noted – – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc . – – Version 1.00 Page AAT1346A/B/C ONT ONT ONT June 2008 ...

Page 8

... TYPICAL TYPICAL TYPICAL TYPICAL PPLICATION PPLICATION PPLICATION PPLICATION CIRCUIT AAT1346A/B/C CIRCUIT CIRCUIT CIRCUIT – – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc . – – Version 1.00 Page June 2008 AAT1346A/B/C ...

Page 9

... ENC Control Input The AAT1346 contains built-in pull high logic. The IC is enabled when ENC becomes floating (ENC pin voltage 1.6V). When the voltage is lower than 0.4V, the IC > ...

Page 10

... ESR is as follows: V ripple Where maximum load current, and ESR. Compensation The AAT1346 employs current-mode control, thereby simplifying the control-loop compensation. When the AAT1346 operates with continuous inductor current (typically the case), a the loop-gain frequency response. To ensure stability, set the compensation for the below the lower of 1/10 the switching frequency (380kHz) ...

Page 11

... IN. Z < f /4, ESR – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc . – – Version 1.00 Page AAT1346A/B/C . Tie the feedback resistor DD – June 2008 ...

Page 12

... A 1.35 A1 0.05 A2 ------ b 0.33 C 0.19 D 4.80 E 5. 0.406 y ------ θ 0˚ TYP MIN 1.60 1.73 ------ 0.15 1.45 ------ 0.41 0.51 0.20 0.25 4.85 4.95 5.99 6.20 3.91 3.99 1.27 BSC 0.710 1.270 ------ 0.076 ------ 8˚ – 台 灣 類 比 科 技 股 份 有 限 公 司 Advanced Analog Technology, Inc . – – Version 1.00 Page AAT1346A/B/C – June 2008 ...

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