ams AS1104 Low-dropout led driver Datasheet

A S 11 0 1 , A S 11 0 2 , A S 11 0 3 , A S 11 0 4
D a ta S he e t
Low-Dropout LED Drivers
1 General Description
2 Key Features
The AS1101/AS1102/AS1103/AS1104 are LED drivers
designed to match current source bias for any color
LED, including white and blue. The devices can drive up
to 4 high-current LEDs, and the LED current is programmable using an external resistor (RSET).
The AS1101 LED currents are 460 x ISET (per LED, typ)
at an LED cathode voltage (VSAT) of 150mV and 650 x
ISET (typ) at a VSAT of 1V, where ISET is the current
through RSET connected to pin CTRL.
The AS1102, AS1103, and AS1104 LED currents are
230 x ISET (per LED, typ) at a VSAT of 150mV and 325 x
ISET (typ) at a VSAT of 1V.
The AS1101, AS1102, and AS1104 incorporate a chipenable feature via pin ON. When the devices are disabled, the supply current drops to less than 1µA.
The AS1101, AS1102, and AS1103 are available in a
6-pin SC70 package; the AS1104 is available in a 8-pin
MSOP package.
!
LED Drivers for Parallel-Connected LEDs
!
Ultra-Low Voltage Drop: Less Than 150mV (for Liion Battery Support)
!
Analog and PWM Brightness Control
!
Up to 80mA per LED (AS1101)
!
Up to 40mA per LED (AS1102, AS1103, AS1104)
!
No Electromagnetic Interference, No SwitchingNoise
!
Current-Matching Requires No External Components
!
Active-Low Shutdown Mode (AS1101, AS1102,
and AS1103)
!
Low Shutdown-Current: Less Than 1µA
!
SC70-6 Package (AS1101, AS1102, and AS1103)
!
MSOP-8 Package (AS1104)
3 Applications
Figure 1. Typical Application Diagrams
The AS110x devices are ideal for LED displays and keyboard backlights, as well as lighting management units
for battery powered audio devices such as MP3 and CD
players, mobile and cordless phones, PDAs, portable
DVD players, and consumer electronics.
3 Diode Control with Enable
2 Diode Control with Enable
VIN
VIN
I1/I2 VSAT
I3/I4
I1 VSAT
ISET
VSET
(3V)
I2
I3
ISET
RSET CTRL
VSET
(3V)
AS1101
ENABLE
RSET CTRL
AS1102
ENABLE
ON
ON
GND
GND
4 Diode Control
4 Diode Control with Enable
VIN
VIN
I1 VSAT I2
I3
I4
I1 VSAT I2
I3
I4
ISET
ISET
VSET
(3V)
RSET CTRL
AS1103
VSET
(3V)
RSET CTRL
AS1104
ENABLE
ON
GND
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GND
Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments – (Top View)
CTRL
1
I1/I2
2
N/C
3
AS1101
6
ON
5
4
CTRL
1
I3/I4
I2
2
GND
I1
3
AS1102
6
ON
CTRL
1
5
I3
I2
2
4
GND
I1
3
AS1103
6
I3
5
I4
4
GND
6-Pin SC70
ON
1
I3
2
8
N/C
7
CTRL
AS1104
I4
3
6
I2
GND
4
5
I1
8-Pin MSOP
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
Pin Name
CTRL
(see Figure 2)
Description
Sets LED current; connect to external resistor.
I1
Connect to cathode of LED.
I2
Connect to cathode of LED.
I3
Connect to cathode of LED.
I4
Connect to cathode of LED.
GND
ON
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Ground
Device Enable Input.
Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those listed in Electrical Characteristics
on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 2. Absolute Maximum Ratings
Parameter
Min
Max
Unit
VI1, VI2, VI3, VI4, CTRL and ON Voltage to GND
-0.3
5
V
200
mW
SC70-6
250
mW
MSOP-8
100
mA
260
ºC
150
ºC
150
ºC
Power Dissipated by Device at TAMB = 85°C
I1, I2, I3, I4 Steady State Current
Package Body Temperature
†
Junction Temperature
Storage Temperature
-65
Electrostatic Discharge Protection (ESD) Level
2
kV
Comment
Human Body Model;
Norm: MIL-STD883E 3015 methods.
†
The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020C “Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices”.
Operating Conditions
Table 3. Recommended Operating Conditions
Parameter
Min
Typ
Max
Unit
LED Cathode Voltage
0.15
0.6
3.6
V
2.2
3.0
3.6
V
0
0.2
0.5
V
-40
25
85
ºC
Enable Voltage ON Mode
Enable Voltage OFF Mode
Ambient Temperature
†
†
†
Comments
Not applicable to AS1103.
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Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
AS1101 Electrical Characteristics
TAMB = 25°C (unless otherwise noted).
Table 4. Electrical Characteristics – AS1101
Parameter
Symbol
Conditions
Min
Typ
ISET Range
ISET
VON = 3V
25
Output Current Multiplication Ratio
OCMR
ISET = 25µA, VSAT = 150mV, VON = 3V
350
500
650
Output Current Multiplication Ratio
OCMR
ISET = 40µA, VSAT = 150mV, VON = 3V
335
480
625
Output Current Multiplication Ratio
OCMR
ISET = 75µA, VSAT = 150mV, VON = 3V
295
420
545
Output Current Multiplication Ratio
OCMR
ISET = 25µA, VSAT = 600mV, VON = 3V
435
620
805
Output Current Multiplication Ratio
OCMR
ISET = 40µA, VSAT = 600mV, VON = 3V
425
610
795
Output Current Multiplication Ratio
OCMR
ISET = 75µA, VSAT = 600mV, VON = 3V
415
590
765
Output Current Multiplication Ratio
OCMR
ISET = 25µA, VSAT = 1000mV, VON = 3V
470
670
870
Output Current Multiplication Ratio
OCMR
ISET = 40µA, VSAT = 1000mV, VON = 3V
460
660
860
Output Current Multiplication Ratio
OCMR
ISET = 75µA, VSAT = 1000mV, VON = 3V
440
630
820
LED-to-LED Current Matching
Match
VON = 3V
-3
ISET in OFF Mode
ISET,OFF
VCTRL = 3V, VSAT = 3V, VON = 0V
IIN in OFF Mode
IIN,OFF
VCTRL = 3V, VSAT = 3V, VON = 0V,
TAMB = 25ºC
150
†
η
†
VIN = 3V, VON = 3V
µA
3
%
0.1
1
µA
0.1
1
µA
VCTRL = 3V, VSAT = 3V, VON = 0V
Peak Efficiency
Max Units
4
95
%
Efficiency = (VIN - VSAT)/VIN. Information parameter, guaranteed by design.
AS1102, AS1103, AS1104 Electrical Characteristics
TAMB = 25°C (unless otherwise noted).
Table 5. Electrical Characteristics – AS1102, AS1103, AS1104
Parameter
Symbol
Conditions
Min
ISET Range
ISET
VON = 3V
25
Output Current Multiplication Ratio
OCMR
ISET = 25µA, VSAT = 150mV, VON = 3V
175
250
325
Output Current Multiplication Ratio
OCMR
ISET = 40µA, VSAT = 150mV, VON = 3V
170
240
310
Output Current Multiplication Ratio
OCMR
ISET = 75µA, VSAT = 150mV, VON = 3V
145
210
275
Output Current Multiplication Ratio
OCMR
ISET = 25µA, VSAT = 600mV, VON = 3V
215
310
405
Output Current Multiplication Ratio
OCMR
ISET = 40µA, VSAT = 600mV, VON = 3V
215
305
395
Output Current Multiplication Ratio
OCMR
ISET = 75µA, VSAT = 600mV, VON = 3V
205
295
385
Output Current Multiplication Ratio
OCMR
ISET = 25µA, VSAT = 1000mV, VON = 3V
235
335
435
Output Current Multiplication Ratio
OCMR
ISET = 40µA, VSAT = 1000mV, VON = 3V
230
330
430
Output Current Multiplication Ratio
OCMR
ISET = 75µA, VSAT = 1000mV, VON = 3V
220
315
410
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Revision 1.5
Typ
Max Units
150
µA
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AS1101/AS1102/AS1103/AS1104
Data Sheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 5. Electrical Characteristics – AS1102, AS1103, AS1104
Parameter
Symbol
Conditions
Min
LED-to-LED Current Matching
Match
VON = 3V
-3
ISET,OFF
VCTRL = 3V, VSAT = 3V, VON = 0V
IIN,OFF
VCTRL = 3V, VSAT = 3V, VON = 0V,
TAMB = 25°C
ISET in OFF Mode
IIN in OFF Mode
1
1
2
η
VIN = 3V, VON = 3V
Max Units
3
%
0.1
1
µA
0.1
1
µA
VCTRL = 3V, VSAT = 3V, VON = 0V
Peak Efficiency
Typ
2
95
%
1. Not applicable to AS1103.
2. Efficiency = (VIN - VSAT) / VIN. Information parameter, guaranteed by design.
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Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - Ty p i c a l P e r f o r m a n c e C h a r a c t e r i s t i c s
7 Typical Performance Characteristics
Figure 4. Set Current vs.VSET; RSET = 30kΩ
100
100
90
90
80
80
70
70
60
60
ISET (µA) e
ISET (µA) e
Figure 3. Set Current vs. VCTRL
50
40
30
50
40
30
20
20
10
10
0
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
VCTRL (V)
VSET (V)
Figure 5. AS1101 ILED vs. VSAT
Figure 6. AS1102, AS1103, AS1104 ILED vs. VSAT
35
30
30
25
ISET = 100µA
25
ILED (mA) e
ILED (mA) e
ISET = 50µA
20
ISET = 25µA
15
20
15
ISET = 50µA
10
10
ISET = 25µA
5
5
0.0
0.2
0.4
0.6
0.8
0.0
1.0
0.2
350
600
300
500
250
400
200
OCMR
OCMR
0.8
1.0
Figure 8. AS1102, AS1103, AS1104 OMCR vs. ISET
700
300
0.6
VSAT (V)
VSAT (V)
Figure 7. AS1101 OMCR vs. ISET
0.4
150
200
100
100
50
0
0
0
20
40
60
80
0
100 120 140 160
40
60
80
100 120 140 160
ISET (µA)
ISET (µA)
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20
Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - Ty p i c a l P e r f o r m a n c e C h a r a c t e r i s t i c s
Figure 9. AS1102, AS1103, AS1104 ILED vs. RSET,
VSET = 3V
Figure 10. AS1102, AS1103, AS1104 ILED vs. RSET;
VSET = 3V
22
35
SAT =
= 0.5V
0.5V
VVSAT
20
VSAT = 1V
30
SAT =
= 0.6V
0.6V
VVSAT
VSAT = 0.6V
25
16
ILED (mA) e
ILED (mA) e
18
14
12 VVSAT
SAT =
= 0.4V
0.4V
10
20
15
10
8
VSAT = 0.3V
SAT =
= 0.3V
0.3V
VVSAT
6
5
4
VSAT = 0.15V
0
0
20
40
60
80
100 120 140 160
0
20 40 60 80 100 120 140 160 180 200
RSET (kΩ)
RSET (kΩ)
Figure 11. AS1101 ILED vs. RSET; VSET = 3V
22
13
VSAT = 0.30V
VSAT = 0.25V
VSAT = 0.15V
20
Figure 12. ILED vs. Temp; VLED = -0.25V, ISET = 50µA
18
ILED (mA) e
VSAT = 0.20V
14
12
VSAT = 0.10V
VSAT = 0.05V
10
8
ILED (mA) e
12.5
16
12
11.5
6
4
2
11
10
20 30
40
50 60
70
80 90 100
-40
-20
RSET (kΩ)
45
80
40
70
35
60
30
50
25
30
60
80
100
20
15
20
10
10
5
0
40
Figure 14. AS1102, AS1103, AS1104 ILED vs. ISET
90
40
20
Temperature (°C)
ILED (mA) e
ILED (mA) e
Figure 13. AS1101 ILED vs. ISET
0
0
0
20
40
60
80
100 120 140 160
0
ISET (µA)
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20
40
60
80
100 120 140 160
ISET (µA)
Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - Ty p i c a l P e r f o r m a n c e C h a r a c t e r i s t i c s
Figure 15. AS1101 vs. RSET
Figure 16. AS1102, AS1103, AS1104 ILED vs. VIN
60
60
50
50
AS11011
LED Type 2
30
ILED (mA) e
40
RSET
20
10
40
30
20
10
0
0
3.5
4.0
4.5
5.0
3.0
VIN (V)
4.5
5.0
2V/Div
LED Current
Figure 18. Enable Voltage Transient Response
Enable Voltage
10mA/Div
LED Current
CTRL Voltage
4.0
VIN (V)
Figure 17. Control Voltage Transient Response
1µs/Div
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3.5
10mA/Div
3.0
2V/Div
ILED (mA) e
LED Type 1
1µs/Div
Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
8 Application Information
Figure 19. Typical Application Diagrams
3 Diode Control with Enable
2 Diode Control with Enable
VIN
VIN
I1/I2 VSAT
I3/I4
I1 VSAT
ISET
VSET
(3V)
I2
I3
ISET
RSET CTRL
VSET
(3V)
AS1101
ENABLE
RSET CTRL
AS1102
ENABLE
ON
ON
GND
GND
4 Diode Control
4 Diode Control with Enable
VIN
VIN
I1 VSAT I2
I3
I4
I1 VSAT I2
I3
I4
ISET
ISET
VSET
(3V)
RSET CTRL
AS1103
VSET
(3V)
RSET CTRL
AS1104
ENABLE
ON
GND
GND
Setting the LED Current
The current going into the LEDs is approximately OCMR times greater then the current ISET. LED current is controlled
by VSET and RSET (see Figure 19) according to the formula:
ILED = OCMR x (VSET - VCTRL)/RSET
(EQ 1)
For VSET = 3V and a specific LED current, the value of RSET can be determined using the graphs shown in Figure 9,
Figure 10, and Figure 11 on page 7. For any other option, the value of ISET can be determined using the graph in
Figure 3 on page 6.
Note: LED brightness can also be adjusted by driving pin ENABLE or pin CTRL with a PWM signal.
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Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
9 Package Drawings and Markings
Figure 20. SC70-6 Package
Notes:
1. All dimensions are in millimeters.
2. Dimensions are inclusive of plating.
3. Dimensions are exclusive of mold flash and metal burrs.
4. All specifications comply with JEITA SC88 and JEDEC-MO-203.
Symbol
Min
e
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Max
0.65 BSC
D
1.80
2.20
b
0.15
0.30
E
1.15
1.35
HE
1.80
2.40
Q1
0.10
0.40
A2
0.80
1.00
A1
0.00
0.10
A
0.80
1.10
c
0.10
0.18
L
0.10
0.30
Lj
0.26
0.46
Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
Figure 21. MSOP-8 Package
Symbol
Millimeters
± Tolerance
Symbol
Millimeters
± Tolerance
A
1.10
Max
b
0.33
+0.07 to -0.08
A1
0.10
±0.05
b1
0.30
±0.05
A2
0.86
±0.08
c
0.18
±0.05
D
3.00
±0.10
c1
0.15
+0.03 to -0.02
D2
2.95
±0.10
θ1
3.0º
±3.0º
E
4.90
±0.15
θ2
12.0º
±3.0º
E1
3.00
±0.10
θ3
12.0º
±3.0º
E2
2.95
±0.10
L
0.55
±0.15
E3
0.51
±0.13
L1
0.95 BSC
E4
0.51
±0.13
aaa
0.10
R
0.15
+0.15 to -0.08
bbb
0.08
R1
0.15
+0.15 to -0.08
ccc
0.25
t1
0.31
±0.08
e
.65 BSC
t2
0.41
±0.08
S
.525 BSC
Notes:
1.
2.
3.
4.
5.
6.
7.
All dimensions are in millimeters (angle in degrees), unless otherwise specified.
Datums B and C to be determined at datum plane H.
Dimensions D and E1 are to be determined at datum plane H.
Dimensions D2 and E2 are for top package and D and E1 are for bottom package.
Cross section A-A to be determined at 0.13 to 0.25mm from the lead tip.
Dimensions D and D2 do not include mold flash, protrusion, or gate burrs.
Dimension E1 and E2 do not include interlead flash or protrusion.
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Revision 1.5
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AS1101/AS1102/AS1103/AS1104
Data Sheet - O r d e r i n g I n f o r m a t i o n
10 Ordering Information
Part Number
Marking
AS1101-T
JO1
Dual LED driver with enable.
AS1102-T
JO2
Triple LED driver with enable.
AS1103-T
JO3
Quad LED driver.
JO4
Quad LED driver with enable.
AS1104-T
AS1104
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Description
Revision 1.5
Package Type
Delivery Form
SC70-6
Tape and Reel
MSOP-8
Tape and Reel
Tubes
12 - 13
AS1101/AS1102/AS1103/AS1104
Data Sheet
Copyrights
Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner.
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in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding
the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior
to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information.
This product is intended for use in normal commercial applications. Applications requiring extended temperature
range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or lifesustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for
each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard
production flow, such as test flow or test location.
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Tel: +43 (0) 3136 500 0
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Revision 1.5
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