AAT1500 [AAT]
CONSTANT CURRENT BOOST CONVERTER FOR 1 TO 4 WHITE LEDS; 恒流升压转换器, 1至4个白光LED型号: | AAT1500 |
厂家: | ADVANCED ANALOG TECHNOLOGY, INC. |
描述: | CONSTANT CURRENT BOOST CONVERTER FOR 1 TO 4 WHITE LEDS |
文件: | 总14页 (文件大小:288K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Advanced Analog Technology, Inc.
July 2008
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
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.
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Up to 4 LEDs at 2.8V Supply
High Efficiency (85%)
Output Over Voltage Protection
HV Internal Switch
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.
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
The AAT1500 is available in SOT23-5, SOT23-6,
TSOT23-6 and VSON8 packages.
APPLICATIONS
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Palmtops
MP3 Player
PIN CONFIGURATION
Digital Still Cameras
Portable Media Player
Cell Phones and Smart Phones
Electronic Information Organizers
TYPICAL APPLICATION
V
=
IR1
IE
R1
–
–
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Advanced Analog Technology, Inc.
July 2008
AAT1500
ORDERING INFORMATION
DEVICE
TYPE
PART
NUMBER
TEMP.
RANGE
MARKING
DESCRIPTION
PACKAGE
PACKING
MARKING
S5:SOT
23-5
(SOT25)
S3:SOT
23-6
(SOT26)
S13:TSOT
23-6
AAT1500
-S5-T
T: Tape
and Reel
AAT1500
AAT1500
AAT1500
AAT1500
−40°C to 85°C
−40°C to 85°C
−40°C to 85°C
−40°C to +85°C
│1500
Device Type
Device Type
Device Type
Device Type
AAT1500
-S3-T
T: Tape
and Reel
│1500
│1500
1500
AAT1500
-S13-T
T: Tape
and Reel
(TSOT26)
AAT1500
-Q6-T
Q6:VSON
8-2.2*2.2
T: Tape
and Reel
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTICS
SYMBOL
VALUE
UNIT
V
V
Supply Voltage
−0.3to 7
−0.3to 21
DD
SW, OVP to GND
V
Other I/O Pin Voltage
−0.3to 6
V
Junction Temperature
125
°C
°C
°C
°C
T
Storage Temperature Range
Operating Temperature Range
Lead Temperature
−45°C to +125°C
−40°C to +85°C
260°C
STORAGE
T
C
T
L
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
V
Supply Voltage
2.6 to 6
V
DD
–
–
–
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AAT1500
DISSIPATION RATINGS
CHARACTERISTICS
PACKAGE
SYMBOL
VALUE
UNIT
θ
SOT23-6
208
°C /W
JA
Package Thermal Resistance
θ
VSON8
50
°C /W
JA
P
SOT23-6
0.48
W
d
Power Dissipation,
T = 25°C
C
P
VSON8
2
W
d
ELECTRICAL CHARACTERISTICS
(
V
= 3.6 V, T = 25°C , unless otherwise specified.)
DD C
Operating Condition
PARAMETER
SYMBOL
TEST CONDITION
MIN
2.6
TYP
MAX
4.5
2.3
2
UNIT
V
V
Supply Voltage
DD
V
Under Voltage Lockout
Operating Current
1.8
2.2
V
UVLO
I
V
V
= 5.5V, Switch on
mA
DD
DD
= 5.5V
DD
I
Quiescent Current
Shutdown Current
250
0.1
500
1
µA
µA
Q
V
= 1.3V, Switch off
FB
I
V
= 5.5V, V < 0.4V
SD
DD
EN
Oscillator
PARAMETER
SYMBOL
TEST CONDITION
MIN
0.8
79
TYP
1.0
85
MAX
1.2
UNIT
MHz
%
f
Operating Frequency
Maximum Duty Cycle
OSC
D
92
MAX
Reference Voltage
PARAMETER
SYMBOL
TEST CONDITION
Note
MIN
TYP
MAX
UNIT
V
Feedback Voltage
0.237 0.250 0.263
V
IE
Note: To measure the feedback voltage, the device V would connect to the application circuit. The inductance is
IE
10 µH and the output voltage equals 12V.
–
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AAT1500
ELECTRICAL CHARACTERISTICS
( V = 3.6 V, T = 25°C , unless otherwise specified.)
DD
C
N-Channel Switch
PARAMETER
Current Limit
SYMBOL
TEST CONDITION
MIN
0.60
0.50
TYP
0.75
0.75
0.01
MAX
0.90
1.00
20.0
UNIT
A
I
LIM
R
On-Resistance
Ω
ON
I
V
= 12V
µA
Leakage Current
SWOFF
SW
Control and Protection
PARAMETER
SYMBOL
TEST CONDITION
MIN
14.5
0.4
TYP
4
MAX
6
UNIT
I
µA
EN pin Current
OVP Threshold
EN
V
15.5
0.8
0.8
20.0
1.4
V
OVP
V
Chip Enable
Chip Disable
V
V
ENH
Chip Enable/Disable
V
ENL
–
–
–
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July 2008
AAT1500
TYPICAL OPERATING CHARACTERISTICS
Typical Application
Efficiency vs. VO
VIN :
2.6V~5.5V
92%
90%
88%
86%
84%
82%
80%
78%
76%
L1 4.7
H
D1
AAT1500
D2
LED
VDD
1
2
3
6
D3
LED
SW
C1
10 F
OVP
D4
LED
5
4
C2
10
GND
IE
F
EN
R1
12.4
3.5
6.5
9.5
12.5
VO (V)
Efficiency vs. V
Efficiency vs. LED Current
IN
95%
90%
85%
80%
75%
70%
65%
60%
94%
92%
90%
88%
86%
84%
82%
80%
78%
76%
2-LED
1-LED
1-LED
3-LED
3-LED
4-LED
4-LED
2-LED
0
5
10
15
20
25
30
2.5
3
3.5
4
4.5
5
5.5
LED Current (mA)
V (V)
IN
LED Current vs. VIN
LED Current vs. VO
22.5
22
22
21.5
21
21.5
21
20.5
20
20.5
20
19.5
19
19.5
18.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
3
4
5
6
7
8
9
10 11
VO (V)
V (V)
IN
–
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AAT1500
TYPICAL OPERATING CHARACTERISTICS
°C
–
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July 2008
AAT1500
PIN DESCRIPTION
PIN NO
SOT23-5
PIN NO PIN NO
SOT23-6 TSOT23-6
PIN NO
VSON8
NAME
I/O
DESCRIPTION
1
2
3
4
-
1
2
3
4
5
6
-
1
2
3
4
5
6
-
8
4
6
3
1
2
7
5
SW
GND
IE
O
-
Switch Pin
Ground
I
Inverting Input Pin of error amplifier
Chip Enable/Disable(Active High)
Over Voltage Protection
Supply Voltage
EN
I
OVP
I
V
5
-
-
DD
GND1
NC
-
SW MOS Ground
-
-
-
-
Not Connected
FUCTION BLOCK DIAGRAM
SOT23-5
–
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July 2008
AAT1500
FUCTION BLOCK DIAGRAM
SOT23-6 and TSOT23-6
VSON8
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Advanced Analog Technology, Inc.
July 2008
AAT1500
TYPICAL APPLICATION CIRCUIT
SOT23-5
V
IE
R1 =
IR1
SOT23-6 and TSOT23-6
V
IE
R1 =
IR1
VSON8
V
IE
R1 =
IR1
–
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Advanced Analog Technology, Inc.
July 2008
AAT1500
TYPICAL APPLI CATION CIRCUIT
V
V
− VDS
IE
R1 = IE , R2 =
IR1
IR2
V
= 0.25V (typical)
IE
VDS = RDS(ON) ×IR2 (MOSFET Spec.)
–
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July 2008
AAT1500
PACKAGE DIMENSION
SOT23-5(SOT25)
Dimensions In Millimeters
Symbol
MIN
1.05
------
1.0
TYP
1.20
MAX
A
A1
A2
b
1.35
0.15
1.2
------
1.1
0.3
0.08
------
------
0.5
0.2
c
D
2.90 BSC
2.80 BSC
1.60 BSC
0.95 BSC
1.90 BSC
0.45
E
E1
e
e1
L
0.35
0.55
L1
L2
R
0.60 REF
0.25 BSC
------
0.1
0.10
------
0.25
R1
------
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θ
0
5
10
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θ1
3
10
7
–
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Advanced Analog Technology, Inc.
July 2008
AAT1500
PACKAGE DIMENSION
SOT23-6(SOT26)
Dimensions In Millimeters
SYMBOL
MIN
TYP
1.2
MAX
A
A1
A2
b
1.05
------
1
1.35
0.15
1.2
------
1.1
0.4
0.08
------
------
0.55
0.2
c
D
E
E1
e
e1
L
2.90 BSC
2.80 BSC
1.60 BSC
0.95 BSC
1.90 BSC
0.45
0.35
0.55
L1
L2
R
0.60 REF
0.25 BSC
------
0.10
0.10
------
0.25
R1
------
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θ
0
5
10
ꢀ
ꢀ
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θ1
3
5
7
–
–
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Advanced Analog Technology, Inc.
July 2008
AAT1500
PACKAGE DIMENSION
TSOT23-6 (TSOT26)
Dimensions In Millimeters
Symbol
MIN
TYP
------
MAX
A
A1
A2
b
0.75
0
0.9
0.1
0.8
0.5
0.2
3
------
0.75
0.7
0.4
0.08
2.8
2.6
1.5
------
------
c
D
2.9
2.8
E
3
1.7
E1
e
1.6
0.95 BSC
1.90 BSC
0.45
e1
L
0.3
0.6
L1
L2
R
0.60 REF
0.25 BSC
------
0.1
0.1
------
0.25
R1
------
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θ
0
8
4
ꢀ
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ꢀ
θ1
10
4
12
–
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Advanced Analog Technology, Inc.
July 2008
AAT1500
PACKAGE DIMENSION
VSON8
C
PIN1 INDENT
Chornfer:0.2
L
A1
D2
D
A
Dimensions In Millimeters
Symbol
MIN
TYP
0.9
MAX
1.0
A
A1
b
C
D
0.8
0.00
0.20
0.19
2.1
0.02
0.25
0.20
2.2
0.05
0.30
0.25
2.3
D2
E
1.0
2.1
1.1
2.2
1.2
2.3
E2
e
L
1.5
1.6
1.7
------
0.25
0.000
0.55
0.35
------
------
0.45
0.076
y
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