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
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
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.
APPLICATIONS
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 AAT1500 PART NUMBER AAT1500 -S5-T AAT1500 -S3-T AAT1500 -S13-T AAT1500 -Q6-T PACKAGE S5:SOT 23-5 (SOT25) S3:SOT 23-6 (SOT26) S13:TSOT 23-6 (TSOT26) Q6:VSON 8-2.2*2.2 PACKING T: Tape and Reel T: Tape and Reel T: Tape and Reel T: Tape and Reel TEMP. RANGE −40 ° C to 85 ° C −40 ° C to 85 ° C −40 ° C to 85 ° C −40 ° C to +85 ° C MARKING │1500 │1500 │1500 1500 MARKING DESCRIPTION Device Type
AAT1500
Device Type
AAT1500
Device Type
AAT1500
Device Type
ABSOLUTE MAXIMUM RATINGS
CHARACTERISTICS Supply Voltage SW, OVP to GND Other I/O Pin Voltage Junction Temperature Storage Temperature Range Operating Temperature Range Lead Temperature SYMBOL VALUE UNIT V V V
VDD
−0.3 to 7 −0.3 to 21 −0.3 to 6
125
°C °C °C °C
TSTORAGE TC TL
−45 ° C to +125 ° C −40 ° C to +85 ° C 260 ° 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 Supply Voltage SYMBOL VALUE 2.6 to 6 UNIT V
VDD
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July 2008
AAT1500
DISSIPATION RATINGS
CHARACTERISTICS Package Thermal Resistance VSON8 SOT23-6 Power Dissipation, TC = 25 ° C VSON8 PACKAGE SOT23-6 SYMBOL VALUE 208 50 0.48 2 UNIT
θJA θJA
Pd Pd
° C /W ° C /W
W W
ELECTRICAL CHARACTERISTICS
( VDD = 3.6 V, TC = 25 ° C , 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 2.2 TYP MAX 4.5 2.3 2 250 0.1 500 1 UNIT V V mA µA µA
VDD VUVLO IDD VDD = 5.5V, Switch on
IQ ISD
VDD = 5.5V VFB = 1.3V, Switch off VDD = 5.5V, VEN < 0.4V
Oscillator
PARAMETER Operating Frequency Maximum Duty Cycle SYMBOL TEST CONDITION MIN 0.8 79 TYP 1.0 85 MAX 1.2 92 UNIT MHz %
fOSC DMAX
Reference Voltage
PARAMETER Feedback Voltage SYMBOL TEST CONDITION Note MIN 0.237 TYP 0.250 MAX 0.263 UNIT V
VIE
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 Current Limit On-Resistance Leakage Current SYMBOL TEST CONDITION MIN 0.60 0.50 TYP 0.75 0.75 0.01 MAX 0.90 1.00 20.0 UNIT A
ILIM RO N ISWOFF VSW = 12V
µA
Control and Protection
PARAMETER EN pin Current OVP Threshold Chip Enable/Disable SYMBOL TEST CONDITION MIN TYP 4 14.5 Chip Enable Chip Disable 0.4 15.5 0.8 0.8 MAX 6 20.0 1.4 UNIT
IEN VOVP VENH VENL
µA
V V V
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TYPICAL OPERATING CHARACTERISTICS
Typical Application
D1 D2 LED D3 LED D4 LED L1 4.7 H VIN : 2.6V~5.5V
Efficiency vs. VO
92% 90% 88%
AAT1500
1 2 SW VDD 6 C1 10 F
86% 84% 82%
C2 10 F
OVP 5 GND EN 4
3 IE R1 12.4
80% 78% 76% 3.5 6.5 9.5 12.5
Efficiency vs. VIN
94% 92% 90% 88% 86% 84% 82% 80% 78% 76% 2.5 3
95%
VO (V) Efficiency vs. LED Current
2-LED
90% 1-LED 85% 3-LED
1-LED
3-LED 4-LED
80% 75% 70% 65% 60%
4-LED 2-LED
3.5
4
4.5
5
5.5
0
5
10
15
20
25
30
VIN (V)
22.5 22 21.5 21 20 20.5 20 19.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 19.5 19 18.5 3 4
LED Current (mA)
22 21.5 21 20.5
LED Current vs. VIN
LED Current vs. VO
5
6
7
8
9
10
11
VIN (V)
VO (V)
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TYPICAL OPERATING CHARACTERISTICS
°C
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PIN DESCRIPTION
PIN NO SOT23-5 1 2 3 4 5 PIN NO SOT23-6 1 2 3 4 5 6 PIN NO TSOT23-6 1 2 3 4 5 6 PIN NO VSON8 8 4 6 3 1 2 7 5 NAME SW GND IE EN OVP I/O O I I I Switch Pin Ground Inverting Input Pin of error amplifier Chip Enable/Disable(Active High) Over Voltage Protection Supply Voltage SW MOS Ground Not Connected DESCRIPTION
VDD
GND1 NC
FUCTION BLOCK DIAGRAM
SOT23-5
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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 =
VIE IR1
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AAT1500
TYPICAL APPLI CATION CIRCUIT
D
R1 =
V − VDS VIE , R 2 = IE IR1 IR 2
CLK
VIE = 0.25 V ( typical) VDS = RDS( ON) × IR2 (MOSFET Spec.)
S
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PACKAGE DIMENSION
SOT23-5(SOT25)
Symbol A A1 A2 b c D E E1 e e1 L L1 L2 R R1 θ
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 3
5 10
10 7
θ1
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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
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 3
5 5
10 7
θ1
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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
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
4 10
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8 12
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θ1
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July 2008
AAT1500
PACKAGE DIMENSION
VSON8
PIN1 INDENT
C
Chornfer:0.2
D A
A1
D2
L
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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