AMSCO AS1104

austriamicrosystems
A S 11 0 1 , A S 11 0 2 , A S 11 0 3 , A S 11 0 4
Data Sheet
Low-Dropout LED Drivers
1 General Description
2 Key Features
The AS110x family are LED drivers providing matched
current source bias for any color LED, including white
and blue. LED current is programmable using an external resistor.
!
The AS1101 LED currents are typical 460 x ISET (per
LED) at an LED cathode voltage of 150mV and typical
650 x ISET at an LED cathode voltage of 1V.
!
The AS1102, AS1103, and AS1104 LED currents are
typical 230 x ISET (per LED) at an LED cathode voltage
of 150mV and typical 325 x ISET at an LED cathode voltage of 1V where ISET is the current through the external
resistor connected to the CTRL pin.
The AS110x family can drive up to 4 high-current LEDs.
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 devices are pin-to-pin compatible to the FAN5611,
FAN5612 and FAN5614.
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)
Pin-to-Pin Compatible to FAN5611, FAN5612, and
FAN5614
3 Applications
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.
Figure 1. Typical Application Diagrams
2 Diode Control with On/Off
3 Diode Control with On/Off
VIN
VIN
I1/I2
ISET
CTRL
VSET(3V)
RSET
ISET
VSET(3V)
AS1101
ON
ENABLE
I3/I4
I3
CTRL
RSET
4 Diode Control
I1
AS1102
ON
ENABLE
GND
I2
GND
4 Diode Control with On/Off
VIN
VIN
ISET
I4
CTRL
VSET(3V)
RSET
I3
I2
AS1103
GND
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I1
ISET
I4
CTRL
VSET(3V)
RSET
ENABLE
Revision 1.3
ON
I3
I2
I1
AS1104
GND
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AS1101, AS1102, AS1103, AS1104
Data Sheet
Operating Conditions
4 Absolute Maximum Ratings
Stresses beyond those listed in Table 1 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 Table 2 is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 1. 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
°C
150
°C
150
°C
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”.
4.1 Operating Conditions
Table 2. 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
°C
Enable Voltage ON Mode
Enable Voltage OFF Mode
Ambient Temperature
†
†
†
Comments
Not applicable to AS1103.
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AS1101, AS1102, AS1103, AS1104
Data Sheet
Electrical Characteristics – AS1101
5 DC Electrical Characteristics
5.1 Electrical Characteristics – AS1101
Conditions: TAMB = 25°C (unless otherwise noted).
Table 3. Electrical Characteristics – AS1101
Parameter
Symbol
Conditions
Min
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
315
450
585
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 = 25°C
†
†
EFF
VIN = 3V, VON = 3V
Max Units
150
µA
3
%
0.1
1
µA
0.1
1
µA
VCTRL = 3V, VSAT = 3V, VON = 0V
Peak Efficiency
Typ
4
95
%
Efficiency = (VIN - VSAT) / VIN. Information parameter, guaranteed by design.
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AS1101, AS1102, AS1103, AS1104
Data Sheet
Electrical Characteristics – AS1102, AS1103, AS1104
5.2 Electrical Characteristics – AS1102, AS1103, AS1104
Conditions: TAMB = 25°C (unless otherwise noted).
Table 4. 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
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
2
3
EFF
VIN = 3V, VON = 3V
Max Units
150
µA
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. Not applicable to AS1103.
3. Efficiency = (VIN - VSAT) / VIN. Information parameter, guaranteed by design.
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AS1101, AS1102, AS1103, AS1104
Data Sheet
6 Typical Performance Characteristics
ISET vs V SET (RSET = 30k Ω)
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
ISET in µA
ISET (µA)
ISET vs V CTRL
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
0.0
0.5
1.0
1.5
V CTRL (V)
AS1101
ILED vs V SAT
2.5
3.0
3.5
4.0
AS1102-AS1104
ILED vs V SAT
30
35
30
ISET = 100µA
25
ISET = 50µA
25
ILED (mA)
ILED (mA)
2.0
V SET (V)
20
ISET = 25µA
15
20
ISET = 50µA
15
10
10
5
5
ISET = 25µA
0.0
0.2
0.4
0.6
0.8
1.0
0.0
0.2
0.4
V SAT (V)
AS1102-AS1104
0.6
0.8
1.0
V SAT (V)
AS1102-AS1104
ILED vs RSET
ILED vs RSET
35
22
30
20
25
16
Vsat=0.6V
14
Vsat=0.5V
12
Vsat=0.4V
10
Vsat=0.3V
ILED (mA)
ILED ( mA)
18
Vsat=1V
Vsat=0.6V
20
Vsat=0.3V
15
Vsat=0.15V
10
8
5
6
4
0
20
40
60
80
100
120
140
0
160
0
RSET (k Ω )
AS1101
ILED vs RSET
20
40
60
80
100 120
RSET (k Ω )
140
160
180
200
ILED vs Te m pe rature (V LED = 0.25V, ISET = 50µA)
22
20
13
18
12.5
14
Vsat=0.30V
12
Vsat=0.25V
10
Vsat=0.20V
8
Vsat=0.15V
6
Vsat=0.10V
4
12
11.5
Vsat=0.05V
2
10
20
30
ILED in mA
ILED (mA)
16
40
50
60
70
80
90
100
-40
0
20
40
60
80
11
100
Te m pe rature (°C)
RSET (k Ω )
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AS1101, AS1102, AS1103, AS1104
Data Sheet
OCM R vs ISET
AS1102 - AS1104
700
350
600
300
500
250
OCMR
OCMR
AS1101
400
300
200
150
200
100
100
50
0
OCM R vs ISET
0
0
20
40
60
80
100
120
140
160
0
ISET (µA)
20
40
60
80
100
120
140
160
ISET (µA)
Figure 2. Control Voltage Transient Response
CH2: LED Current (10mA/Div)
CH1: Control Voltage (2V/Div)
Figure 3. Enable Voltage Transient Response
CH2: LED Current (10mA/Div)
CH1: Enable Voltage (2V/Div)
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AS1101, AS1102, AS1103, AS1104
Data Sheet
7 Application Information
Figure 4. Typical Application Diagrams
2 Diode Control with On/Off
3 Diode Control with On/Off
VIN
VIN
I1/I2
ISET
CTRL
VSET(3V)
ON
I3
ISET
VSET(3V)
AS1101
RSET
ENABLE
I3/I4
I2
CTRL
AS1102
RSET
ON
ENABLE
GND
4 Diode Control
I1
GND
4 Diode Control with On/Off
VIN
VIN
I4
ISET
I3
CTRL
VSET(3V)
RSET
I2
I1
I4
ISET
AS1103
I3
CTRL
VSET(3V)
ON
ENABLE
I1
AS1104
RSET
GND
I2
GND
Figure 5. Performance Characteristics
ILED vs ISET
AS1102 - AS1104
90
45
80
40
70
60
35
30
ILED (mA)
ILED (mA)
AS1101
50
40
30
20
10
25
20
15
10
5
0
0
0
20
40
60
80
100
120
140
160
0
20
40
ISET (µA)
60
80
100
120
140
160
ISET (µA)
AS1102 - AS1104
AS1101 vs Res is tor
ILED vs V IN
60
60
50
50
AS1101
40
30
20
LED Type 1
40
ILED (mA)
ILED (mA)
ILED vs ISET
LED Type 2
30
20
Resistor
10
10
0
0
3.0
3.5
4.0
4.5
5.0
3.0
V IN (V)
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3.5
4.0
4.5
5.0
V IN (V)
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AS1101, AS1102, AS1103, AS1104
Data Sheet
Setting the LED Current
7.1 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 4) according to the formula:
ILED = OCMR x (VSET - VCTRL)
RSET
(EQ 1)
For VSET = 3V and a specific LED current, the RSET value can be determined using the diagram shown in Section 6
Typical Performance Characteristics on page 5. For any other option, the value of ISET can be determined using the
graph “ISET vs. VCTRL” on page 7.
LED Brightness can also be adjusted by driving pin ENABLE or pin CTRL with a PWM signal.
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AS1101, AS1102, AS1103, AS1104
Data Sheet
Pin Descriptions and Assignments
8 Pinout and Packaging
8.1 Pin Descriptions and Assignments
Table 5. Pin Descriptions
Pin (See
Figure 6)
Name
Description
CTRL
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
Ground
ON
Device Enable Input.
Figure 6. Pin Assignment – (Top View)
CTRL
1
I1/I2
2
N/C
3
AS1101
6
ON
CTRL
1
5
I3/I4
I2
2
4
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 Packages
ON
1
I3
2
8
N/C
7
CTRL
AS1104
I4
3
6
I2
GND
4
5
I1
8-Pin MSOP Package
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AS1101, AS1102, AS1103, AS1104
Data Sheet
Package Drawings and Markings
8.2 Package Drawings and Markings
Figure 7. 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
0.30
b
0.15
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
L1
0.26
0.46
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AS1101, AS1102, AS1103, AS1104
Data Sheet
Package Drawings and Markings
Figure 8. MSOP-8 Package
Notes:
1.
2.
3.
4.
5.
6.
All dimensions are in millimeters (angles 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; dimensions D and E1 are for bottom package.
Cross section A-A to be determined at 0.18 to 0.22mm from the leadtip.
Dimension D and D2 does not include mold flash, protrusions, or gate burrs.
7. Dimension E1 and E2 does not include inter-lead flash or protrusion.
MSOP-8 Package Outline
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
±0.05
c
0.18
±0.05
D
3.00
±0.10
c1
0.15
+0.03 to -0.02
D2
2.95
±0.10
θ1
3.0
±3.0
E
4.90
±0.15
θ2
12.0
±3.0
E1
3.00
±0.10
θ3
12.0
±3.0
E2
2.95
±0.10
L
0.55
±0.15
E3
0.51
±0.13
L1
0.95 BSC
-
E4
0.51
±0.18
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
.5 BSC
t2
0.41
±0.08
S
.525 BSC
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AS1101, AS1102, AS1103, AS1104
Data Sheet
9 Ordering Information
Part Number
Package Type
Delivery Form
Description
Dual LED driver with enable.
SC70-6
Tape and Reel
Tube
Triple LED driver with enable.
AS1101
AS1102
AS1103
AS1104
Quad LED driver with enable.
MSOP-8
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Quad LED driver.
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AS1101, AS1102, AS1103, AS1104
Data Sheet
Copyrights
Copyright © 1997-2005, 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.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing
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.
The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of
austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters
austriamicrosystems AG
A-8141 Schloss Premstaetten, Austria
Tel: +43 (0) 3136 500 0
Fax: +43 (0) 3136 525 01
e-mail: info@austriamicrosystems.com
For Sales Offices, Distributors and Representatives, please visit:
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