AAT AAT1500-S13-T Constant current boost converter for 1 to 4 white led Datasheet

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
Up to 4 LEDs at 2.8V Supply
The AAT1500 is a step-up converter that provides a
High Efficiency (85%)
solution to drive 1 to 4 white LEDs with a constant
Output Over Voltage Protection
current from a lithium cell, and its switching frequency is
HV Internal Switch
fixed at 1 MHz.
1 MHz PWM Switching Frequency
The AAT1500 offers a low 0.25V reference, which
Uses Tiny 1 mm Height Inductor
2.6V to 6V Input Range
0.1µA Shutdown Current
SOT23-5 , SOT23-6,TSOT23-6, and VSON8
minimizes power loss in the current setting resistor and
improves efficiency. Except in SOT23-5 package,
protection
Packages Available
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,
APPLICATIONS
TSOT23-6 and VSON8 packages.
Palmtops
MP3 Player
Digital Still Cameras
Portable Media Player
Cell Phones and Smart Phones
Electronic Information Organizers
PIN CONFIGURATION
TYPICAL APPLICATION
V
R1 = IE
IR1
–
–
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AAT1500
ORDERING INFORMATION
DEVICE
TYPE
PART
NUMBER
AAT1500
AAT1500
-S5-T
AAT1500
AAT1500
-S3-T
AAT1500
AAT1500
-S13-T
AAT1500
AAT1500
-Q6-T
PACKAGE
PACKING
TEMP.
RANGE
MARKING
MARKING
DESCRIPTION
T: Tape
and Reel
−40 ° C to 85 ° C
│1500
Device Type
T: Tape
and Reel
−40 ° C to 85 ° C
│1500
Device Type
T: Tape
and Reel
−40 ° C to 85 ° C
│1500
Device Type
T: Tape
and Reel
−40 ° C to +85 ° C
1500
Device Type
S5:SOT
23-5
(SOT25)
S3:SOT
23-6
(SOT26)
S13:TSOT
23-6
(TSOT26)
Q6:VSON
8-2.2*2.2
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTICS
SYMBOL
VALUE
UNIT
VDD
−0.3 to 7
V
SW, OVP to GND
−0.3 to 21
V
Other I/O Pin Voltage
−0.3 to 6
V
Junction Temperature
125
°C
TSTORAGE
−45 ° C to +125 ° C
°C
Operating Temperature Range
TC
−40 ° C to +85 ° C
°C
Lead Temperature
TL
260 ° C
°C
Supply Voltage
Storage Temperature Range
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
VDD
2.6 to 6
V
Supply Voltage
–
–
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AAT1500
DISSIPATION RATINGS
CHARACTERISTICS
PACKAGE
SYMBOL
VALUE
UNIT
SOT23-6
θJA
208
° C /W
VSON8
θJA
50
° C /W
SOT23-6
Pd
0.48
W
VSON8
Pd
2
W
Package Thermal Resistance
Power Dissipation, TC = 25 ° C
ELECTRICAL CHARACTERISTICS
( VDD = 3.6 V, TC = 25 ° C , unless otherwise specified.)
Operating Condition
PARAMETER
SYMBOL
MIN
MAX
UNIT
4.5
V
2.3
V
2
mA
250
500
µA
0.1
1
µA
MIN
TYP
MAX
UNIT
VDD
2.6
VUVLO
1.8
Supply Voltage
Under Voltage Lockout
TEST CONDITION
Operating Current
IDD
Quiescent Current
IQ
Shutdown Current
ISD
TYP
2.2
VDD = 5.5V, Switch on
VDD = 5.5V
VFB = 1.3V, Switch off
VDD = 5.5V, VEN < 0.4V
Oscillator
PARAMETER
SYMBOL
TEST CONDITION
Operating Frequency
fOSC
0.8
1.0
1.2
MHz
Maximum Duty Cycle
DMAX
79
85
92
%
MIN
TYP
MAX
UNIT
0.237
0.250
0.263
V
Reference Voltage
PARAMETER
SYMBOL
VIE
Feedback Voltage
TEST CONDITION
Note
Note: 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.
–
–
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AAT1500
ELECTRICAL CHARACTERISTICS
( VDD = 3.6 V, TC = 25 ° C , unless otherwise specified.)
N-Channel Switch
PARAMETER
SYMBOL
TEST CONDITION
MIN
TYP
MAX
UNIT
Current Limit
ILIM
0.60
0.75
0.90
A
On-Resistance
RON
0.50
0.75
1.00
Ω
0.01
20.0
µA
TYP
MAX
UNIT
4
6
µA
15.5
20.0
V
0.8
1.4
V
Leakage Current
ISWOFF
VSW = 12V
Control and Protection
PARAMETER
SYMBOL
EN pin Current
IEN
OVP Threshold
VOVP
Chip Enable/Disable
TEST CONDITION
14.5
VENH
Chip Enable
VENL
Chip Disable
–
–
MIN
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0.4
0.8
V
Advanced Analog Technology, Inc.
July 2008
AAT1500
TYPICAL OPERATING CHARACTERISTICS
Typical Application
μ
L1 4.7 H
D1
μ
Efficiency vs. VO
92%
90%
AAT1500
D2
LED
D3
LED
D4
LED
C2
10 F
VIN :
2.6V~5.5V
88%
1
2
SW
VDD 6
86%
μ
C1
10 F
OVP 5
GND
84%
82%
3 IE
EN 4
80%
Ω
R1
12.4
78%
76%
3.5
9.5
12.5
VO (V)
Efficiency vs. LED Current
Efficiency vs. VIN
94%
92%
90%
88%
86%
84%
82%
80%
78%
76%
6.5
95%
2-LED
1-LED
90%
1-LED
85%
3-LED
80%
3-LED
4-LED
2-LED
75%
4-LED
70%
65%
60%
2.5
3
3.5
4
4.5
5
0
5.5
5
15
20
25
30
LED Current (mA)
VIN (V)
22.5
10
LED Current vs. VIN
LED Current vs. VO
22
21.5
22
21
21.5
20.5
21
20
20.5
19.5
20
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
VO (V)
VIN (V)
–
–
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10
11
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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
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
VDD
-
Supply Voltage
-
-
-
7
GND1
-
SW MOS Ground
-
-
-
5
NC
-
Not Connected
FUCTION BLOCK DIAGRAM
SOT23-5
–
–
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DESCRIPTION
Advanced Analog Technology, Inc.
July 2008
AAT1500
FUCTION BLOCK DIAGRAM
SOT23-6 and TSOT23-6
VSON8
–
–
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AAT1500
TYPICAL APPLICATION CIRCUIT
SOT23-5
R1 =
VIE
IR1
SOT23-6 and TSOT23-6
V
R1 = IE
IR1
VSON8
R1 =
–
–
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IR1
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AAT1500
TYPICAL APPLI CATION CIRCUIT
CLK
D
R1 =
V − VDS
VIE
, R 2 = IE
IR1
IR 2
S
VIE = 0.25 V ( typical)
VDS = RDS( ON) × IR2 (MOSFET Spec.)
–
–
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AAT1500
PACKAGE DIMENSION
SOT23-5(SOT25)
Symbol
A
A1
A2
b
c
D
E
E1
e
e1
L
L1
L2
R
R1
θ
θ1
Dimensions In Millimeters
MIN
TYP
MAX
1.05
1.20
1.35
----------0.15
1.0
1.1
1.2
0.3
-----0.5
0.08
-----0.2
2.90 BSC
2.80 BSC
1.60 BSC
0.95 BSC
1.90 BSC
0.35
0.45
0.55
0.60 REF
0.25 BSC
0.1
----------0.10
-----0.25
0
5
10
3
10
7
–
–
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AAT1500
PACKAGE DIMENSION
SOT23-6(SOT26)
SYMBOL
A
A1
A2
b
c
D
E
E1
e
e1
L
L1
L2
R
R1
θ
θ1
Dimensions In Millimeters
MIN
TYP
MAX
1.35
1.05
1.2
0.15
----------1
1.1
1.2
0.4
0.55
-----0.08
0.2
-----2.90 BSC
2.80 BSC
1.60 BSC
0.95 BSC
1.90 BSC
0.35
0.45
0.55
0.60 REF
0.25 BSC
0.10
----------0.10
0.25
------
0
5
10
3
5
7
–
–
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AAT1500
PACKAGE DIMENSION
TSOT23-6 (TSOT26)
Symbol
A
A1
A2
b
c
D
E
E1
e
e1
L
L1
L2
R
R1
θ
θ1
Dimensions In Millimeters
MIN
TYP
MAX
0.75
-----0.9
0
-----0.1
0.7
0.75
0.8
0.4
-----0.5
0.08
-----0.2
2.8
2.9
3
2.6
2.8
3
1.5
1.6
1.7
0.95 BSC
1.90 BSC
0.3
0.45
0.6
0.60 REF
0.25 BSC
0.1
----------0.1
-----0.25
0
4
8
4
10
12
–
–
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AAT1500
PACKAGE DIMENSION
VSON8
C
PIN1 INDENT
Chornfer:0.2
A1
D
A
Symbol
A
A1
b
C
D
D2
E
E2
e
L
y
Dimensions In Millimeters
MIN
TYP
MAX
0.8
0.9
1.0
0.00
0.02
0.05
0.20
0.25
0.30
0.19
0.20
0.25
2.1
2.2
2.3
1.0
1.1
1.2
2.1
2.2
2.3
1.5
1.6
1.7
-----0.55
-----0.25
0.35
0.45
0.000
-----0.076
–
–
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D2
L
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