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AAT1500 Schematic ( PDF Datasheet ) - AAT

Teilenummer AAT1500
Beschreibung CONSTANT CURRENT BOOST CONVERTER FOR 1 TO 4 WHITE LEDS
Hersteller AAT
Logo AAT Logo 




Gesamt 17 Seiten
AAT1500 Datasheet, Funktion
Advanced Analog Technology, Inc.
AAT1500
Product information presented is current as of publication date. Details are subject to change without notice
CONSTANT CURRENT BOOST CONVERTER
FOR 1 TO 4 WHITE LEDS
Features
General Description
z Up to 4 LEDs at 2.8V Supply
mz High Efficiency (85%)
oz Output Over Voltage Protection
.cz HV Internal Switch
z 1 MHz PWM Switching Frequency
Uz Uses Tiny 1 mm Height Inductor
t4z 2.6V to 6V Input Range
ez 0.1µA Shutdown Current
ez SOT-25, SOT-26 & VQFN-8
hPackage Available
The AAT1500 is a step-up converter that provides a
solution to drive 1 to 4 white LEDs with a constant
current from a Lithium Ion cell, and its switching
frequency is fixed at 1 MHz.
The AAT1500 offers a low 0.25V reference, which
minimizes power loss in the current setting resistor
and improves efficiency. Except in SOT-25 package,
protection features include output over voltage
protections. The AAT1500 consists of a 0.1µA
shutdown current, and HV internal switch. Input
supple range allows operation from 2.6V to 6V.
taSPin Configuration
TOP
aVIEW
.DSW 1
5 VDD SW
GND 2
GND
wIE 3
4 EN IE
TOP
VIEW
16
VDD
2 5 OVP
3 4 EN
wSOT- 25 PACKAGE SOT- 26 PACKAGE
w TOP
VIEW
omOVP 1
8 SW
.cVDD 2
7 GND1
t4UEN 3
6 IE
eGND 4
5 NC
The AAT1500 is available in 5-pin SOT-25, 6-pin
SOT-26 and 8-pin VQFN-8 package.
Applications
z Palmtops
z MP3 Player
z Digital Still Cameras
z Portable Media Player
z Cell Phones and Smart Phones
z Electronic Information Organizers
SheVQFN-8 PACKAGE
ata– –
.DAdvanced Analog Technology, Inc.
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AAT1500 Datasheet, Funktion
Advanced Analog Technology, Inc.
AAT1500
Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage
to the device. Exposure to absolute maximum rating conditions for extended period of time
may affect device reliability.
Note 2. To measure the feedback voltage, the device VIE would connect to the application circuit. The
inductance is 10 µH and the output voltage equals 12V.
Block Diagram
SOT-25
Bandgap 0.25V
Soft-Start VBG
IE
0.25V
VBG
Oscillator
Current Sense
VDD
Control
Logic
Driver
EN
SW
GND/
GND1
––
Advanced Analog Technology, Inc.
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AAT1500 pdf, datenblatt
Advanced Analog Technology, Inc.
AAT1500
Package Dimensions
SOT-26
––
Advanced Analog Technology, Inc.
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