Datasheet

AS1111
Low–Dropout LED Drivers
General Description
The AS1111A/AS1111B/AS1111C 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 AS1111A LED currents are 460 x I SET (per LED, typ) at an LED
cathode voltage (V SAT ) of 150mV and 650 x ISET (typ) at a V SAT
of 1V, where I SET is the current through RSET connected to pin
CTRL.
The AS1111B & AS1111C LED currents are
230 x I SET (per LED, typ) at a V SAT of 150mV and 325 x ISET (typ)
at a V SAT of 1V.
All AS1111 versions incorporate a chip-enable feature via pin
EN. When the devices are disabled, the supply current drops
down to less than 1μA. The AS1111A and AS1111B are available
in a 6-pin WL-CSP package with 0.4mm pitch. The AS1111C is
available in an 8-pin MLPD (2x2mm) package with 0.5mm pitch.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS1111, Low–Dropout LED Drivers
are listed below:
Figure 1:
Added Value of Using AS1111
Benefits
Features
High efficient
• Ultra Low Voltage Drop: less than 150mV
Supports a variety of end applications
• Analog and PWM Brightness Control
• Up to 80mA per LED (AS1111A)
• Up to 40mA per LED (AS1111B, AS1111C)
Extended battery life
• Active-Low Shutdown Mode
• Low Shutdown Current: less than 1μA
Suitable for EMF sensitive environment
• No electromagnetic interference
• No switching noise
Small PCB area
• Less external components needed
Cost effective, small package
• 6-pin WL-CSP with 0.4mm pitch
• 8-pin MLPD (2x2mm) with 0.5mm pitch
ams Datasheet
[v1-06] 2015-Apr-07
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AS1111 − General Description
Applications
The AS1111 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.
Application Diagram
The typical application diagram of this device for reference is
shown below:
Figure 2:
AS1111 Typical Application Diagram
VIN
VSAT
VSET
3.0V
RSET
ON
I1/I2
I3/I4
CTRL
AS1111A
EN
OFF
GND
VIN
VSAT
VSET
3.0V
RSET
ON
I1
I2
I3
CTRL
AS1111B
EN
OFF
GND
VIN
VSAT
VSET
3.0V
RSET
ON
I1
I2
I3
I4
CTRL
EN
AS1111C
OFF
GND
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AS1111 − Pin Assignment
Pin Assignment
Figure 3:
Pin Assignment of AS1111A/B and AS1111C
1
8
AS1111C
2
7
MLPD 8-pin 2x2mm
Exposed pad: GND
3
4
9
6
5
Pin Assignment: Shows the TOP through view pin assignment of the AS1111A/B and AS1111C.
Pin Description
Figure 4:
Pin Description of AS1111
Pin Number
Pin
Name
Description
AS1111A
AS1111B
AS1111C
A2
A2
4
GND
Ground. Connect to GND
B2
-
-
GND
Ground. Connect to GND (AS1111A)
B3
B3
7
CTRL
Control. Sets the LED current; connect to external
resistor RSET
B1
B1
1
EN
Enable. Device enable/PWM Input.
1 = Normal Operation
0 = Shutdown
-
A3
5
I1
Input1. Connect to cathode of LED1 (AS1111B&C)
-
B2
6
I2
Input2. Connect to cathode of LED2 (AS1111B&C)
-
A1
2
I3
Input3. Connect to cathode of LED3 (AS1111B&C)
ams Datasheet
[v1-06] 2015-Apr-07
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AS1111 − Pin Assignment
Pin Number
Pin
Name
Description
AS1111A
AS1111B
AS1111C
A3
-
-
I1/I2
Input1/2. Connect to cathode of LED1 (AS1111A)
A1
-
-
I3/I4
Input3/4. Connect to cathode of LED2 (AS1111A)
-
-
3
I4
Input4. Connect to cathode of LED4 (AS1111C)
8
NC
Not Connected. (AS1111C)
-
-
9
Exposed Pad. Connect this pad to the GND plane
on the PCB to maximize power dissipation
(AS1111C)
Pin Description: Shows the pin number, name and description of every pin.
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AS1111 − Absolute Maximum Ratings
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. These are stress
ratings only. Functional operation of the device at these or any
other conditions beyond those indicated under Electrical
Characteristics is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
Absolute Maximum Ratings
Figure 5:
Absolute Maximum Ratings
Symbol
Parameter
Min
Max
Units
Comments
Electrical Parameters
Supply Voltage to
Ground
5V pins
-0.3
5.0
V
Input Current
(latch-up immunity)
-100
100
mA
Applicable for pins:
I1, I2, I3, I4, I1/I2, I3/I4, CTRL, EN
Norm: JEDEC JESD78
Electrostatic Discharge
ESDHBM
Electrostatic Discharge
HBM
±2
kV
Norm: JEDEC JESD22-A114F
Temperature Ranges and Storage Conditions
TA
RTHJA (1)
Operating Temperature
-40
Junction to Ambient
Thermal Resistance
TJ
Junction Temperature
TSTRG
Storage Temperature
Range
TBODY
Package Body
Temperature
RHNC
Relative Humidity
non-condensing
MSL
Moisture Sensitivity
Level (WL-CSP & MLPD)
-55
5
1
85
°C
60
°C/W
MLPD
95
°C/W
WL-CSP
125
°C
WL-CSP
125
°C
260
°C
85
%
Norm: IPC/JEDEC J-STD-020 (2)
Represents an unlimited floor life
time
Note(s) and/or Footnote(s):
1. Junction-to-ambient thermal resistance is very dependent on application and board-layout. In situations where high maximum
power dissipation exists, special attention must be paid to thermal dissipation during board design.
2. The reflow peak soldering temperature (body temperature) is specified according to IPC/JEDEC J-STD-020 “Moisture/Reflow
Sensitivity Classification for Non-hermetic Solid State Surface Mount Devices.”
ams Datasheet
[v1-06] 2015-Apr-07
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AS1111 − Electrical Characteristics
Electrical Characteristics
All limits are guaranteed. The parameters with min and max
values are guaranteed with production tests or SQC (Statistical
Quality Control) methods.
Figure 6:
Electrical Characteristics
Symbol
Note
Min
Typ
Max
Unit
Cathode Voltage
at pins I1, I2, I3, I4, I1/I2,
I3/I4
0.15
0.6
3.6
V
VEN_HIGH
Enable Voltage High
pin EN
2.2
3.6
V
VEN_LOW
Enable Voltage Low
pin EN
0
0.5
V
ISET range
VEN = 3V
25
150
μA
ISET in OFF mode
VCTRL = 3V, VSAT = 3V,
VEN = 0V
0.1
1
μA
VCTRL = 3V, VSAT = 3V,
VEN = 0V, TAMB = 25°C
0.1
1
μA
VCTRL = 3V, VSAT = 3V,
VEN = 0V,
TAMB = -40°C to 85°C
(for AS1111A)
4
μA
VCTRL = 3V, VSAT = 3V,
VEN = 0V,
TAMB = -40°C to 85°C
2
μA
VSAT
ISET
ISET_OFF
IIN_OFF
Parameter
IIN in OFF mode
Eff (1)
Peak Efficiency
VIN = 3V, VEN = 3V
95
Match
LED to LED Current
Matching
VEN = 3V
-3
%
3
%
Electrical Characteristics: Shows the Electrical Characteristics of the LED Driver. TAMB = –40 to 85°C (unless
otherwise specified)
Note(s) and/or Footnote(s):
1. Efficiency = (VIN – V SAT )/VIN. Guaranteed by design.
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AS1111 − Electrical Characteristics
Figure 7:
Output Current Multiplication Ratio
AS1111A
AS1111B
AS1111C
ISET = 25μA, VSAT = 150mV, VEN = 3V
350
500
650
ISET = 40μA, VSAT = 150mV, VEN = 3V
335
480
625
ISET = 75μA, VSAT = 150mV, VEN = 3V
295
420
545
ISET = 25μA, VSAT = 600mV, VEN = 3V
435
620
805
ISET = 40μA, VSAT = 600mV, VEN = 3V
425
610
795
ISET = 75μA, VSAT = 600mV, VEN = 3V
415
590
765
ISET = 25μA, VSAT = 1V, VEN = 3V
470
670
870
ISET = 40μA, VSAT = 1V, VEN = 3V
460
660
860
ISET = 75μA, VSAT = 1V, VEN = 3V
440
630
820
ISET = 25μA, VSAT = 150mV, VEN = 3V
175
250
325
ISET = 40μA, VSAT = 150mV, VEN = 3V
170
240
310
ISET = 75μA, VSAT = 150mV, VEN = 3V
145
210
275
ISET = 25μA, VSAT = 600mV, VEN = 3V
220
310
405
ISET = 40μA, VSAT = 600mV, VEN = 3V
215
305
395
ISET = 75μA, VSAT = 600mV, VEN = 3V
205
295
385
ISET = 25μA, VSAT = 1V, VEN = 3V
235
335
435
ISET = 40μA, VSAT = 1V, VEN = 3V
230
330
430
ISET = 75μA, VSAT = 1V, VEN = 3V
220
315
410
Output Current Multiplication Ratio: Shows the OCMR of the LED Driver for setting of ISET and different
Cathode Voltages VSAT. TAMB = –40 to 85°C (unless otherwise specified)
ams Datasheet
[v1-06] 2015-Apr-07
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AS1111 − Typical Operating Characteristics
Typical Operating
Characteristics
Figure 8:
SET Current vs. CTRL Voltage
Figure 9:
SET Current vs. SET Voltage, RSET = 30kΩ
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AS1111 − Typical Operating Characteristics
Figure 10:
LED Current vs. SAT Voltage
Figure 11:
OCMR vs. SET Current
700
350
600
300
AS1111A
400
300
AS1111B
AS1111C
250
OCMR
OCMR
500
200
150
200
100
100
50
0
0
0
20
40
60
80 100 120 140 160
ISET (µA)
ams Datasheet
[v1-06] 2015-Apr-07
0
20
40
60
80 100 120 140 160
ISET (µA)
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AS1111 − Typical Operating Characteristics
Figure 12:
LED Current vs. SET Resistor, VSET = 3V
Figure 13:
LED Current vs. SET Resistor, VSET = 3V
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AS1111 − Typical Operating Characteristics
Figure 14:
LED Current vs. Temperature, VLED = -0.25V, ISET = 50μA
Figure 15:
LED Current vs. SET Current
ams Datasheet
[v1-06] 2015-Apr-07
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AS1111 − Typical Operating Characteristics
Figure 16:
VSET Voltage Transient Response
1V/Div
20mA/Div
1us/Div
Figure 17:
VEN Voltage Transient Response
1V/Div
20mA/Div
1us/Div
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AS1111 − Detailed Description
Detailed Description
Setting of the LED Current
The current going into the LEDs is approximately OCMR times
greater than the current I SET. The LED current is controlled by
V SET and R SET according to the formula:
(EQ1)
V SET – V CTRL
I LED = OCMR ⋅ ------------------------------------R SET
For V SET = 3V and a specific LED current, the value of R SET can
be determined using the graphs shown in Figure 12 and
Figure 13. For any other option, the value of ISET can be
determined using the graph in Figure 8.
LED brightness can also be adjusted by driving pin EN or pin
CTRL with a PWM signal.
ams Datasheet
[v1-06] 2015-Apr-07
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AS1111 − Package Drawings & Mark ings
Package Drawings & Markings
Figure 18:
MLPD-8 2x2mm 0.5mm Pitch Package Drawing
RoHS
Green
Ref
Min
Nom
Max
A
0.51
0.55
0.60
A1
0.00
0.02
0.05
A3
0.15 REF
L
0.225
0.325
0.425
b
0.18
0.25
0.30
D
2.00 BSC
E
2.00 BSC
e
0.50 BSC
D2
1.45
1.60
1.70
E2
0.75
0.90
1.00
aaa
-
0.15
-
bbb
-
ccc
0.10
-
0.10
-
ddd
-
0.05
-
eee
-
0.08
-
fff
-
0.10
-
N
8
Note(s) and/or Footnote(s):
1. Dimensioning and Tolerancing conform to ASME Y14.5M-1994.
2. All dimensions are in millimeters. Angles are in degrees.
3. Coplanarity applies to the exposed heat slug as well as the terminal.
4. Radius on terminal is optional.
5. N is the total number of terminals.
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ams Datasheet
[v1-06] 2015-Apr-07
AS1111 − Package Drawings & Markings
Figure 19:
WL-CSP-6 0.4mm Pitch Package Drawing
RoHS
Green
Note(s) and/or Footnote(s):
1. Pin1 = A1
2. ccc Coplanarity
3. All dimensions are in μm
ams Datasheet
[v1-06] 2015-Apr-07
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AS1111 − Package Drawings & Mark ings
Figure 20:
AS1111A & AS1111B Package Marking
WL-CSP
YY
XXXX
XXXX
Figure 21:
AS1111C Package Marking
MLPD package
AAR
XXX
Figure 22:
AS1111 Package Code
YY
XXXX
AAR
XXX
Marking for WL-CSP
Tracecode for WL-CSP
Marking for MLPD
Tracecode for MLPD
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ams Datasheet
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AS1111 − Ordering & Contact Information
Ordering & Contact Information
Figure 23:
Ordering Information
Ordering Code
Marking
Description
Delivery Form
Package
AS1111A-BWLT
CY
Dual LED driver with enable and
80mA LED current per channel
Tape & Reel
6-pin WL-CSP
0.4mm pitch
AS1111B-BWLT
CZ
Triple LED driver with enable and
40mA LED current per channel
Tape & Reel
6-pin WL-CSP
0.4mm pitch
AS1111C-BDFT
AAR
Quad LED driver with enable and
40mA LED current per channel
Tape & Reel
MLPD-8lead
(2mm x 2mm)
Buy our products or get free samples online at:
www.ams.com/ICdirect
Technical Support is available at:
www.ams.com/Technical-Support
Provide feedback about this document at:
www.ams.com/Document-Feedback
For further information and requests, e-mail us at:
[email protected]
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Headquarters
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten
Austria, Europe
Tel: +43 (0) 3136 500 0
Website: www.ams.com
ams Datasheet
[v1-06] 2015-Apr-07
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AS1111 − RoHS Compliant & ams Green Statement
RoHS Compliant & ams Green
Statement
RoHS: The term RoHS compliant means that ams AG products
fully comply with current RoHS directives. Our semiconductor
products do not contain any chemicals for all 6 substance
categories, including the requirement that lead not exceed
0.1% by weight in homogeneous materials. Where designed to
be soldered at high temperatures, RoHS compliant products are
suitable for use in specified lead-free processes.
ams Green (RoHS compliant and no Sb/Br): ams Green
defines that in addition to RoHS compliance, our products are
free of Bromine (Br) and Antimony (Sb) based flame retardants
(Br or Sb do not exceed 0.1% by weight in homogeneous
material).
Important Information: The information provided in this
statement represents ams AG knowledge and belief as of the
date that it is provided. ams AG bases its knowledge and belief
on information provided by third parties, and makes no
representation or warranty as to the accuracy of such
information. Efforts are underway to better integrate
information from third parties. ams AG has taken and continues
to take reasonable steps to provide representative and accurate
information but may not have conducted destructive testing or
chemical analysis on incoming materials and chemicals. ams AG
and ams AG suppliers consider certain information to be
proprietary, and thus CAS numbers and other limited
information may not be available for release.
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AS1111 − Copyrights & Disclaimer
Copyrights & Disclaimer
Copyright ams AG, Tobelbader Strasse 30, 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.
Devices sold by ams AG are covered by the warranty and patent
indemnification provisions appearing in its General Terms of
Trade. ams AG makes no warranty, express, statutory, implied,
or by description regarding the information set forth herein.
ams 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 ams AG
for current information. This product is intended for use in
commercial applications. Applications requiring extended
temperature range, unusual environmental requirements, or
high reliability applications, such as military, medical
life-support or life-sustaining equipment are specifically not
recommended without additional processing by ams AG for
each application. This product is provided by ams AG “AS IS”
and any express or implied warranties, including, but not
limited to the implied warranties of merchantability and fitness
for a particular purpose are disclaimed.
ams 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 ams AG rendering of technical or other services.
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AS1111 − Document Status
Document Status
Document Status
Product Preview
Preliminary Datasheet
Datasheet
Datasheet (discontinued)
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Product Status
Definition
Pre-Development
Information in this datasheet is based on product ideas in
the planning phase of development. All specifications are
design goals without any warranty and are subject to
change without notice
Pre-Production
Information in this datasheet is based on products in the
design, validation or qualification phase of development.
The performance and parameters shown in this document
are preliminary without any warranty and are subject to
change without notice
Production
Information in this datasheet is based on products in
ramp-up to full production or full production which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade
Discontinued
Information in this datasheet is based on products which
conform to specifications in accordance with the terms of
ams AG standard warranty as given in the General Terms of
Trade, but these products have been superseded and
should not be used for new designs
ams Datasheet
[v1-06] 2015-Apr-07
AS1111 − Revision Information
Revision Information
Changes from 1-01 (2013-Nov) to current revision 1-06 (2015-Apr-07)
Page
1-01 (2013-Nov) to 1-03 (2014-Dec-03)
Content was updated to the latest ams design
Updated Figure 3
3
1-03 (2014-Dec-03) to 1-04 (2015-Mar-20)
Updated caption below Figure 3
3
Updated Figure 5
5
Updated Figure 11
9
Updated Figure 16 & Figure 17
12
1-04 (2015-Mar-20) to 1-05 (2015-Apr-06)
Updated Figure 5
5
Updated Figures 16 & 17
12
1-05 (2015-Apr-06) to 1-06 (2015-Apr-07)
Updated text under General Description
1
Note(s) and/or Footnote(s):
1. Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
2. Correction of typographical errors is not explicitly mentioned.
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[v1-06] 2015-Apr-07
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AS1111 − Content Guide
Content Guide
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1
1
2
2
General Description
Key Benefits & Features
Applications
Block Diagram
3
3
Pin Assignment
Pin Description
4
6
8
Absolute Maximum Ratings
Electrical Characteristics
Typical Operating Characteristics
13
13
Detailed Description
Setting of the LED Current
14
17
18
19
20
21
Package Drawings & Markings
Ordering & Contact Information
RoHS Compliant & ams Green Statement
Copyrights & Disclaimer
Document Status
Revision Information
ams Datasheet
[v1-06] 2015-Apr-07