Advanced Analog Technology, Inc.
July 2008
–
台灣類比科技股份有限公司
–
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Advanced Analog Technology, Inc. –
Version 1.00
Page 1 of 14
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
0.1µA Shutdown Current
SOT23-5 , SOT23-6,TSOT23-6, and VSON8
Packages Available
APPLICATIONS
Palmtops
MP3 Player
Digital Still Cameras
Portable Media Player
Cell Phones and Smart Phones
Electronic Information Organizers
TYPICAL APPLICATION
IE
1
R1
V
R
I
=
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 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 SOT23-5 package,
protection features include output over voltage
protections. The AAT1500 consists of a 0.1µA shutdown
current, and HV internal switch. Input supply range
allows operation from 2.6V to 6V.
The AAT1500 is available in SOT23-5, SOT23-6,
TSOT23-6 and VSON8 packages.
PIN CONFIGURATION
Advanced Analog Technology, Inc.
July 2008
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Advanced Analog Technology, Inc. –
Version 1.00
Page 2 of 14
AAT1500
ORDERING INFORMATION
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTICS SYMBOL VALUE UNIT
Supply Voltage
DD
V
3.0−
to 7 V
SW, OVP to GND
3.0−
to 21 V
Other I/O Pin Voltage
3.0−
to 6 V
Junction Temperature 125
C°
Storage Temperature Range
T
−45
C°
to +125
C°
C°
Operating Temperature Range
C
T
−40
C°
to +85
C°
C°
Lead Temperature
L
T
260
C°
C°
Note: 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.
RECOMMENDED OPERATING CONDITIONS
CHARACTERISTICS SYMBOL VALUE UNIT
Supply Voltage
DD
V
2.6 to 6 V
DEVICE
TYPE
PART
NUMBER PACKAGE
PACKING
TEMP.
RANGE MARKING MARKING
DESCRIPTION
AAT1500 AAT1500
-S5-T
S5:SOT
23-5
(SOT25)
T: Tape
and Reel
−40
C°
to 85
C°
│1500 Device Type
AAT1500
AAT1500
-S3-T
S3:SOT
23-6
(SOT26)
T: Tape
and Reel
−40
C°
to 85
C°
│1500 Device Type
AAT1500
AAT1500
-S13-T
S13:TSOT
23-6
(TSOT26)
T: Tape
and Reel
−40
C°
to 85
C°
│1500 Device Type
AAT1500
AAT1500
-Q6-T
Q6:VSON
8-2.2*2.2
T: Tape
and Reel
−40
C°
to +85
C°
1500 Device Type
Advanced Analog Technology, Inc.
July 2008
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Advanced Analog Technology, Inc
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Version 1.00
Page 3 of 14
AAT1500
DISSIPATION RATINGS
CHARACTERISTICS PACKAGE SYMBOL VALUE UNIT
SOT23-6
JA
θ
208
C°
/W
Package Thermal Resistance
VSON8
JA
θ
50
C°
/W
SOT23-6
d
P
0.48 W
Power Dissipation,
C
T
= 25
C°
VSON8
d
P
2 W
ELECTRICAL CHARACTERISTICS
(
DD
V
= 3.6 V,
C
T
= 25
C°
, unless otherwise specified.)
Operating Condition
PARAMETER SYMBOL TEST CONDITION MIN TYP
MAX
UNIT
Supply Voltage
DD
V
2.6 4.5 V
Under Voltage Lockout
UVLO
V
1.8 2.2 2.3 V
Operating Current
DD
I
DD
V
= 5.5V, Switch on 2 mA
Quiescent Current
Q
I
DD
V
= 5.5V
FB
V
= 1.3V, Switch off 250 500 µA
Shutdown Current
SD
I
DD
V
= 5.5V,
EN
V
< 0.4V 0.1 1 µA
Oscillator
PARAMETER SYMBOL TEST CONDITION MIN
TYP
MAX
UNIT
Operating Frequency
OSC
f 0.8 1.0 1.2 MHz
Maximum Duty Cycle
MAX
D 79 85 92 %
Reference Voltage
PARAMETER SYMBOL TEST CONDITION MIN
TYP
MAX
UNIT
Feedback Voltage
IE
V
Note 0.237
0.250
0.263
V
Note: To measure the feedback voltage, the device
IE
V
would connect to the application circuit. The inductance is
10 µH and the output voltage equals 12V.
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AAT1500
ELECTRICAL CHARACTERISTICS
(
DD
V
= 3.6 V,
C
T
= 25 C
°
, unless otherwise specified.)
N-Channel Switch
PARAMETER SYMBOL TEST CONDITION MIN
TYP
MAX
UNIT
Current Limit
LIM
I
0.60
0.75
0.90
A
On-Resistance
ON
R 0.50
0.75
1.00
Ω
Leakage Current
SWOFF
I
SW
V= 12V 0.01
20.0
A
µ
Control and Protection
PARAMETER SYMBOL TEST CONDITION MIN
TYP
MAX
UNIT
EN pin Current
EN
I
4 6 A
µ
OVP Threshold
OVP
V 14.5
15.5
20.0
V
ENH
V Chip Enable 0.8 1.4 V
Chip Enable/Disable
ENL
V Chip Disable 0.4 0.8 V
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AAT1500
TYPICAL OPERATING CHARACTERISTICS
VIN :
2.6V~5.5V
R1
12.4
Ω
C1
10
μ
F
C2
10
μ
F
AAT1500
2 5
6
3 4
1
GND
OVP
VDD
IE EN
SW
D1 L1 4.7
μ
H
D2
LED
D3
LED
D4
LED
Typical Application Efficiency vs. V
O
76%
78%
80%
82%
84%
86%
88%
90%
92%
3.5 6.5 9.5 12.5
V
O
(V)
Efficiency vs. VIN
76%
78%
80%
82%
84%
86%
88%
90%
92%
94%
2.5 3 3.5 4 4.5 5 5.5
VIN
(V)
1-LED 2-LED
3-LED
4-LED
Efficiency vs. LED Current
60%
65%
70%
75%
80%
85%
90%
95%
0 5 10 15 20 25 30
LED Current (mA)
1-LED
2-LED
4-LED 3-LED
LED Current vs. VIN
19.5
20
20.5
21
21.5
22
22.5
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
LED Current vs. VO
18.5
19
19.5
20
20.5
21
21.5
22
3 4 5 6 7 8 9 10 11
V
O
(V)
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AAT1500
TYPICAL OPERATING CHARACTERISTICS
°
C
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AAT1500
PIN DESCRIPTION
PIN NO
SOT23-5
PIN NO
SOT23-6
PIN NO
TSOT23-6
PIN NO
VSON8 NAME I/O DESCRIPTION
1 1 1 8 SW O Switch Pin
2 2 2 4 GND - Ground
3 3 3 6 IE I Inverting Input Pin of error amplifier
4 4 4 3 EN I Chip Enable/Disable(Active High)
- 5 5 1 OVP I Over Voltage Protection
5 6 6 2
DD
V
- Supply Voltage
- - - 7 GND1 - SW MOS Ground
- - - 5 NC - Not Connected
FUCTION BLOCK DIAGRAM
SOT23-5
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AAT1500
FUCTION BLOCK DIAGRAM
SOT23-6 and TSOT23-6
VSON8
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AAT1500
TYPICAL APPLICATION CIRCUIT
SOT23-5
IE
1
R1
V
R
I
=
SOT23-6 and TSOT23-6
IE
1
R1
V
R
I
=
VSON8
IE
1
R1
V
R
I
=
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AAT1500
Spec.) (MOSFETIRV
typical)(V25.0V
I
VV
R,
I
V
R
2R)ON(DSDS
IE
2R
DSIE
2
1R
IE
1
×=
=
−
==
TYPICAL APPLI CATION CIRCUIT
DS
CLK
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AAT1500
PACKAGE DIMENSION
SOT23-5(SOT25)
Dimensions In Millimeters
Symbol MIN TYP MAX
A 1.05 1.20 1.35
A1 ------ ------ 0.15
A2 1.0 1.1 1.2
b 0.3 ------ 0.5
c 0.08 ------ 0.2
D 2.90 BSC
E 2.80 BSC
E1 1.60 BSC
e 0.95 BSC
e1 1.90 BSC
L 0.35 0.45 0.55
L1 0.60 REF
L2 0.25 BSC
R 0.1 ------ ------
R1 0.10 ------ 0.25
θ
0
5
10
θ
1
3
10
7
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AAT1500
PACKAGE DIMENSION
SOT23-6(SOT26)
Dimensions In Millimeters
SYMBOL MIN TYP MAX
A 1.05 1.2 1.35
A1 ------ ------ 0.15
A2 1 1.1 1.2
b 0.4 ------ 0.55
c 0.08 ------ 0.2
D 2.90 BSC
E 2.80 BSC
E1 1.60 BSC
e 0.95 BSC
e1 1.90 BSC
L 0.35 0.45 0.55
L1 0.60 REF
L2 0.25 BSC
R 0.10 ------ ------
R1 0.10 ------ 0.25
θ
0
5
10
θ
1
3
5
7
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AAT1500
PACKAGE DIMENSION
TSOT23-6 (TSOT26)
Dimensions In Millimeters
Symbol MIN TYP MAX
A 0.75 ------ 0.9
A1 0 ------ 0.1
A2 0.7 0.75 0.8
b 0.4 ------ 0.5
c 0.08 ------ 0.2
D 2.8 2.9 3
E 2.6 2.8 3
E1 1.5 1.6 1.7
e 0.95 BSC
e1 1.90 BSC
L 0.3 0.45 0.6
L1 0.60 REF
L2 0.25 BSC
R 0.1 ------ ------
R1 0.1 ------ 0.25
θ
0
4
8
θ
1
4
10
12
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AAT1500
PACKAGE DIMENSION
VSON8
C
A1
A
DD2 L
Chornfer:0.2
PIN1 INDENT
Dimensions In Millimeters
Symbol MIN TYP MAX
A 0.8 0.9 1.0
A1 0.00 0.02 0.05
b 0.20 0.25 0.30
C 0.19 0.20 0.25
D 2.1 2.2 2.3
D2 1.0 1.1 1.2
E 2.1 2.2 2.3
E2 1.5 1.6 1.7
e ------ 0.55 ------
L 0.25 0.35 0.45
y 0.000 ------ 0.076