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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
Up to 4 LEDs at 2.8V Supply High Efficiency (85%) Output Over Voltage Protection HV Internal Switch 1 MHz PWM Switching Frequency Uses Tiny 1 mm Height Inductor 2.6V to 6V Input Range 0.1A Shutdown Current SOT-26 & VQFN-8 Package Available
General Description
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. Protection feature includes output over voltage protection. The AAT1500 consists of a 0.1A shutdown current, and HV internal switch. Input supple range allows operation from 2.6V to 6V. The AAT1500 is available in 6-pin SOT-26 and 8-pin VQFN-8 package.
Pin Configuration
TOP VIEW
SW GND 1 2 3 6 5 VDD
TOP VIEW
OVP 1 8 7 6 5 SW GND1 IE NC
Applications
Palmtops MP3 Player Digital Still Cameras Portable Media Player Cell Phones and Smart Phones Electronic Information Organizers
VDD 2
OVP
EN
IE 4 EN
3 4
GND
SOT-26 PACKAGE
VQFN-8 PACKAGE
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Advanced Analog Technology, Inc.
AAT1500
Pin Description
PIN NO SOT-26 1
2 3 4 5 6 -
PIN NO VQFN-8 8
4 6 3 1 2 7 5
NAME
SW GND IE EN OVP VDD GND1 NC
I/O
O I I I Switch Pin Ground
DESCRIPTION
Inverting Input Pin of Error Amplifier Chip Enable/Disable(Active High) Over Voltage Protection Supply Voltage SW MOS Ground NC
Absolute Maximum Ratings (Note 1)
CHARACTERISTICS
Supply Voltage
SYMBOL VDD
VALUE - 0.3 to 7
- 0.3 to 21 - 0.3 to 6 125
UNIT
V V V
o o o o
SW, OVP to GND Other I/O Pin Voltage Junction Temperature Storage Temperature Range
C
Tstorage TC
- 45 to 125 - 40 to 85
C C C
Operating Temperature Range Lead Temperature
TL
260
Recommended Operating Conditions
CHARACTERISTICS
Supply Voltage
SYMBOL VDD
VALUE
2.6 to 6
UNIT
V
Dissipation Ratings
CHARACTERISTICS
Package Thermal Resistance Power Dissipation, TC = 25 oC
PACKAGE
SOT-26 VQFN-8 SOT-26 VQFN-8
SYMBOL JA JA
Pd Pd
VALUE
208 50 0.48 2
UNIT
o o
C/W C/W W W
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Advanced Analog Technology, Inc.
AAT1500
Electrical Characteristics, VDD = 3.6 V, TC = 25 oC (Unless Otherwise Specified)
Operating Condition PARAMETER
Supply Voltage Under Voltage Lockout Operating Current Quiescent Current Shutdown Current
SYMBOL
TEST CONDITION
MIN
2.6 1.8
TYP MAX UNIT
6.0 2.2 2.3 2 250 0.1 500 1 V V mA A A
VDD
VUVLO
I DD
IQ I SD
VDD = 5.5V, Switch On VDD = 5.5V VFB = 1.3V, Switch Off VDD = 5.5V, VEN < 0.4V
Oscillator PARAMETER Operating Frequency
Maximum Duty Cycle
SYMBOL f OSC
TEST CONDITION
MIN 0.8
79
TYP MAX UNIT 1.0 1.2 MHz
85 92 %
D MAX
Reference Voltage PARAMETER
Feedback Voltage
SYMBOL
TEST CONDITION
Note 2
MIN
TYP MAX UNIT
V
VIE
0.237 0.250 0.263
N-Channel Switch PARAMETER Current Limit
On-Resistance Leakage Current
SYMBOL I LIM
R ON I SWOFF
TEST CONDITION
MIN 0.60
0.50
TYP MAX UNIT A 0.75 0.90
0.75 0.01 1.00 20.00 A
VSW = 12V
Control and Protection PARAMETER
EN pin Current OVP Threshold Chip Enable/Disable
SYMBOL
I EN VOVP VENH VENL
TEST CONDITION
MIN
14.5
TYP MAX UNIT
4 15.5 0.8 6 20.0 1.4 A V V V
Chip Enable Chip Disable 0.4
0.8
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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 H and the output voltage equals 12V.
Block Diagram SOT-26 and VQFN-8
OVP Bandgap Soft-Start IE 0.25V VBG Control Logic 0.25V VBG UVLO OVP VDD
EN SW
GND/ Driver GND1
Current Sense Oscillator
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AAT1500
Application Circuit SOT-26
VIN IN V
2.6V~6V C1 VDD VDD L D1 VOUT V
SSW W OOVP VP IIE E
EEN N GGND ND
VQFN-8
VIN IN V
2.6V~6V C1 VDD VDD EN EN GND1 GND GND SW SW OVP O VP L D1 VOUT V
IE NC
IE
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AAT1500
Package Dimensions SOT-26
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AAT1500
Package Dimensions SOT-26(Cont.)
VARIATION (ALL DIMENSIONS SHOWN IN MILLIMETERS) SYMBO L
A A1 A2 b c D E E1 e e1 L L1 L2 R R1
1
NOTE: 1 JEDEC OUTLINE: MO-178 AB
MIN ----------0.90 0.30 0.08
TYP ----------1.15
MAX
1.45 0.15 1.30 0.50 0.22
----------2.90 BSC 2.80 BSC 1.60 BSC 0.95 BSC 1.90 BSC
0.30
0.45 0.60 REF 0.25 BSC
0.60
0.10 0.10
-----------
-----0.25
0o
5o
4o 10 o
8o 15 o
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Advanced Analog Technology, Inc.
AAT1500
Tape and Reel SOT-26
Packing Method: 3,000pcs/reel, 5 reels/box
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AAT1500
Tape and Reel SOT-26(Cont.)
X.XXX X X.XXX X.XX X.X X
0.0025 0.006
0.025 0.10 0.25
UNIT: MILLIMETERS
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AAT1500
Part Marking
SOT-26 TOP MARKING
XXX
VQFN-8 TOP MARKING
XXX
NOTE: BOTH SOT-26 AND VQFN-8 HAVE NO BACK MARKING.
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AAT1500
Package Dimensions VQFN-8
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