MIC2860-2P
High Efficiency 2-Channel WLED Driver with PWM Control
Features
General Description
•
•
•
•
•
•
•
The MIC2860-2P is a high efficiency white LED
(WLED) driver designed to drive two WLEDs and
greatly extend battery life for portable display
backlighting and keypad backlighting in low-cost
mobile devices. The MIC2860-2P architecture provides
the highest possible efficiency by eliminating switching
losses present in traditional charge pumps or inductive
boost circuits. It features a typical dropout of 52 mV at
30.2 mA per channel. This allows the WLEDs to be
driven directly from the battery, eliminating switching
noise and losses present with the use of boost circuitry.
High Efficiency (No Switching Losses)
PWM Frequency as Low as 250 Hz
Input Voltage Range: 3.0V to 5.5V
Linear Driver Dropout of 52 mV at 30.2 mA
Matching Better than ±0.5% (Typical)
Current Accuracy Better than 1.0% (Typical)
Available in Thin SOT-23 and SC-70 Packages
Applications
•
•
•
•
•
Mobile Handsets
Digital Cameras
Portable Media/MP3 Players
Portable Navigation Devices (GPS)
Portable Applications
The two channels have typical matching of ≤ ±0.5%,
which ensures uniform display illumination under all
conditions. The WLED’s brightness is externally preset
by a resistor and dimmed using PWM interface
operating down to less than 1% duty cycle.
The MIC2860-2P is available in Thin SOT-23 and
SC-70 6-lead packages with a junction temperature
range of –40°C to +125°C.
Package Types
MIC2860-2P
6-Lead SC-70 (C6)
(Top View)
2022 Microchip Technology Inc. and its subsidiaries
MIC2860-2P
6-Lead Thin SOT-23 (D6)
(Top View)
DS20006695A-page 1
MIC2860-2P
Typical Application Circuit
LCD Display Backlight with Two WLEDs
MIC2860-2P
VIN
VIN
1μF
RSET
N
EN
PWM
CONTROL
LOW
DROPOUT
LINEAR
DRIVER
D1
VIN
D2
GND
Functional Block Diagram
D1
VIN
D2
EN
PWM
CONTROL
RSET
GND
DS20006695A-page 2
2022 Microchip Technology Inc. and its subsidiaries
MIC2860-2P
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Main Input Voltage (VIN)............................................................................................................................... –0.3V to +6V
Enable Input Voltage (VEN) ............................................................................................................................–0.3V to VIN
LED Driver Voltage (VD1, D2)..........................................................................................................................–0.3V to VIN
Power Dissipation .................................................................................................................................. Internally Limited
ESD Rating ................................................................................................................................................................ 2 kV
Operating Ratings ‡
Supply Voltage (VIN) ....................................................................................................................................+3.0 to +5.5V
Enable Input Voltage (VEN) .................................................................................................................................0V to VIN
LED Driver Voltage (VD1, D2)...............................................................................................................................0V to VIN
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
‡ Notice: The device is not guaranteed to function outside its operating ratings.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: VIN = VEN = 3.6V, CIN = 1 µF, RSET = 9.53 kΩ; VD1, D2 = 0.6V; TJ = +25°C, bold values
valid for –40°C ≤ TJ ≤ +85°C; unless noted.
Parameter
Symbol
Min.
Typ.
Max.
Units
27.18
30.2
33.22
mA
Note 1
—
±0.5
±3
%
Note 2
VDROP
—
52
125
mV
Where ILED = 90% of LED current
seen at VDROPNOM = 0.6V, 100%
brightness level
Ground/Supply Bias Current
IGND
—
0.7
1.5
mA
IOUT = 30.2 mA
Shutdown Current
ISHDN
—
0.01
1
µA
Current source leakage, VEN = 0V
—
—
0.4
1.4
—
—
—
0.01
1
—
32
80
—
1.5
4
Current Accuracy
Matching
Dropout (VD1, D2)
PWM Dimming
Enable Input Voltage
VEN
Enable Input Current
IEN
Current Source Delay (50%
Levels)
Current Source Transient Time
ON-to-Shutdown Time
Note 1:
2:
—
0.3
—
tRISE
—
0.7
—
tFALL
—
0.2
—
tON_SD
4
5.8
10
V
Conditions
Logic low
Logic high
µA
VEN ≥ 1.4V
µs
Standby to ON
Shutdown to ON
ON to Standby
µs
10% to 90%
ms
VEN = 0V
As determined by the average current of all channels in use and all channels loaded.
The current through each LED meets the stated limits from the average current of all LEDs.
2022 Microchip Technology Inc. and its subsidiaries
DS20006695A-page 3
MIC2860-2P
TEMPERATURE SPECIFICATIONS
Parameters
Sym.
Min.
Typ.
Max.
Units
Conditions
TLEAD
—
—
+260
°C
Soldering, 10 sec.
Junction Temperature Range
TJ
–40
—
+125
°C
—
Storage Temperature
TS
–65
—
+150
°C
—
Thermal Resistance, SC-70 6-Ld
JA
—
256
—
°C/W
—
Thermal Resistance, TSOT 6-Ld
JA
—
177
—
°C/W
—
Temperature Ranges
Lead Temperature
Package Thermal Resistances
DS20006695A-page 4
2022 Microchip Technology Inc. and its subsidiaries
MIC2860-2P
TYPICAL PERFORMANCE CURVES
Note:
LED CURRENT (mA)
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
35
35
30
30
LED2
LED DROPOUT (mV)
2.0
25
20
15
10
25
LED1
20
15
10
5
5
0
RSET = 19.1k
0
5
10
15
20
25
30
35
-40
-20
0
RSET (N )
Peak LED Current vs. RSET.
FIGURE 2-4:
Temperature.
70
32
60
31.5
LED CURRENT (mA)
CURRENT SINK DROPOUT (mV)
FIGURE 2-1:
50
40
LED1
30
40
60
80
100
120
LED2
20
Dropout Voltage vs.
31
LED1
30.5
30
LED2
29.5
29
28.5
10
RSET = 9.53k
28
0
0
10
20
30
-40
40
-20
0
FIGURE 2-2:
Dropout Voltage vs. RSET.
20
40
60
80
100 120
TEMPERATURE (°C)
RSET (k )
FIGURE 2-5:
Temperature.
70
LED Current vs.
16
60
15.5
LED1
LED CURRENT (mA)
LED DROPOUT (mV)
20
TEMPERATURE (°C)
50
40
ILED1
15
ILED2
14.5
LED2
30
20
14
13.5
10
RSET = 19.1k
RSET = 9.53k
13
0
-40
-20
0
20
40
60
80
100
120
-40
Dropout Voltage vs.
2022 Microchip Technology Inc. and its subsidiaries
0
20
40
60
80
100
120
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 2-3:
Temperature.
-20
FIGURE 2-6:
Temperature.
LED Current vs.
DS20006695A-page 5
MIC2860-2P
0.4
0.35
MATCHING (%)
0.3
0.25
RSET = 9.53k
0.2
0.15
0.1
RSET = 19.1k
0.05
0
-40
-20
0
20
40
60
80
100
120
TEMPERATURE (°C)
FIGURE 2-7:
Matching vs. Temperature.
FIGURE 2-10:
Cycle.
PWM Signal at 50% Duty
FIGURE 2-8:
Cycle.
PWM Signal at 1% Duty
FIGURE 2-11:
Cycle.
PWM Signal at 80% Duty
FIGURE 2-9:
Cycle.
PWM Signal at 10% Duty
FIGURE 2-12:
Cycle.
PWM Signal at 100% Duty
DS20006695A-page 6
2022 Microchip Technology Inc. and its subsidiaries
MIC2860-2P
FIGURE 2-13:
Cycle.
LED Startup into 10% Duty
FIGURE 2-16:
ON to Standby.
FIGURE 2-14:
Shutdown to ON.
FIGURE 2-17:
ON to Shutdown.
FIGURE 2-15:
Standby to ON.
2022 Microchip Technology Inc. and its subsidiaries
DS20006695A-page 7
MIC2860-2P
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
PIN FUNCTION TABLE
Pin Number
Pin Name
1
EN
2
GND
Ground.
3
VIN
Voltage Input. Connect at least 1 µF ceramic capacitor between VIN and GND.
4
D2
LED2 driver. Connect LED anode to VIN and cathode to this pin. Do not leave
floating.
5
RSET
6
D1
DS20006695A-page 8
Description
PWM Control Pin. This pin is used as a PWM input for dimming of WLEDs. Do not
leave floating.
An internal 1.27V reference sets the nominal maximum WLED current. Example,
apply a 9.53 kΩ resistor between RSET and GND to set LED current to 30.2 mA at
100% duty cycle.
LED1 driver. Connect LED anode to VIN and cathode to this pin. Do not leave
floating.
2022 Microchip Technology Inc. and its subsidiaries
MIC2860-2P
4.0
FUNCTIONAL DESCRIPTION
A plot of ILED versus RSET is shown in Figure 4-1.
The MIC2860-2P is a two channel WLED driver. The
WLED driver is designed to maintain proper current
regulation with LED current accuracy of 1% with a
typical matching between the 2 channels of ±0.5%. The
WLEDs are driven independently from the input supply
and will maintain regulation with a dropout of 52 mV at
30.2 mA. The low dropout of the linear drivers allows
the WLEDs to be driven directly from the battery
voltage and eliminates the need for large and inefficient
charge pumps. The peak WLED current for each
channel is set via an external resistor. If dimming is
desired the MIC2860-2P can dim via a PWM signal.
4.1
Block Diagram
VIN
The input supply (VIN) provides power to the linear
drivers and the control circuitry. The VIN operating
range is 3V to 5.5V. Due to wire inductance, a minimum
bypass capacitor of 1 µF should be placed close to
input (VIN) pin and the ground (GND) pin.
4.3
EN
The EN pin enables the linear drivers. It can also be
used for dimming with a PWM signal. See the PWM
Dimming Interface section for details. Do not leave
floating.
4.4
LED CURRENT (mA)
30
25
20
15
10
5
0
8
12
16
20
24
28
32
RSET (k)
As shown in the Functional Block Diagram, the
MIC2860-2P consists of two current sinks with the peak
current determined by RSET. The linear drivers have a
designated control block for enabling and dimming of
the WLEDs. The MIC2860-2P is controlled by the PWM
control block that receives PWM signals for dimming.
4.2
35
FIGURE 4-1:
4.5
Peak LED Current vs. RSET.
D1, D2
The D1 and D2 pins are the linear driver inputs for
WLED 1 and 2, respectively. Connect the anodes of the
WLEDs to VIN and each cathode of the WLEDs to D1
and D2. When operating with a single WLED, D1 and
D2 should be connected to the WLED cathode to
parallel the outputs for improved dropout performance.
Paralleling these pins can also be done to drive a
higher current through a single WLED. Do not leave
these pins floating.
4.6
GND
The ground pin is the ground path for the linear drivers.
The current loop for the ground should be as small as
possible. The ground of the input capacitor should be
routed with low impedance traces to the GND pin and
made as short as possible.
RSET
The RSET pin is used by connecting a RSET resistor to
ground to set the peak current of the linear drivers. The
maximum LED current (EN = 100% Duty Cycle) set by
the RSET resistor is shown in the table below:
TABLE 4-1:
MAX. LED CURRENT VS. RSET
RESISTOR VALUES
RSET
ILED
9.53 kΩ
30.2 mA
11.5 kΩ
25.0 mA
14.3 kΩ
20.1 mA
15.8 kΩ
18.2 mA
19.1 kΩ
15.1 mA
28.7 kΩ
10.0 mA
2022 Microchip Technology Inc. and its subsidiaries
DS20006695A-page 9
MIC2860-2P
5.0
APPLICATION INFORMATION
5.1
PWM Dimming Interface
The MIC2860-2P can receive PWM signals from the
EN pin for WLED dimming. Dimming is generated by
pulsing the WLEDs on and off in synchronization with
the PWM signal. The MIC2860-2P incorporates an
internal shutdown delay to ensure that the internal
control circuitry remains active during PWM dimming
for optimum performance.
The lower PWM frequency range is recommended at
250 Hz due to the minimum standby to shutdown time
of 4 ms. Because the period of 250 Hz is 4 ms, a 1%
duty cycle would have an on time of 40 µs and an off
time of 3.96 ms. To support operation down to 1% duty
cycle, the maximum off time must not exceed 4 ms or
the drivers may go into the low IQ shutdown state.
With PWM frequencies higher than 500 Hz the tRISE
(0.7 μs) and tFALL (0.2 μs) times will have a greater
effect on the accuracy of the outputs. An upper
frequency of 500 Hz is recommended to maintain
output accuracy with duty cycles down to 1%. For
systems that do not require a duty cycle below 1%, the
frequency of the PWM signal may be increased. For
example, with a minimum duty cycle of 10% (3.02 mA
with RSET = 9.53 kΩ) the PWM frequency can be
increased to 10 kHz and still maintain accuracy.
5.2
Input Capacitor
The MIC2860-2P is a high performance, high
bandwidth device. Stability can be maintained using a
ceramic input capacitor of 1 µF. Low-ESR ceramic
capacitors provide optimal performance with a
minimum amount of space. Additional high frequency
capacitors, such as small valued NPO dielectric type
capacitors, help filter out high-frequency noise and are
good practice in any noise-sensitive circuit. X5R or
X7R dielectrics are recommended for the input
capacitor. Y5V dielectrics lose most of their
capacitance over temperature and are therefore, not
recommended.
DS20006695A-page 10
2022 Microchip Technology Inc. and its subsidiaries
MIC2860-2P
6.0
TYPICAL APPLICATION SCHEMATIC
U1
MIC2860-2P
1
J3
EN
2
D1
LED
D1
EN
GND
RSET
6
R1
N
5
D2
LED
J1
VIN
TABLE 6-1:
Item
3
D2
4
C1
1μF/6.3V
BILL OF MATERIALS
Part Number
C1
C1608X5R0J105K
R1
CRCW06032052FT1
U1
VIN
MIC2860-2PYC6
MIC2860-2PYD6
Manufacturer
TDK
Vishay
Microchip
2022 Microchip Technology Inc. and its subsidiaries
Description
Qty.
1 µF Ceramic Capacitor, 6.3V, X5R, Size 0603
1
9.53 kΩ, 1%, Size 0603
1
2-Channel PWM Linear WLED Driver, SC-70
2-Channel PWM Linear WLED Driver, SOT-23
1
DS20006695A-page 11
MIC2860-2P
7.0
PACKAGING INFORMATION
7.1
Package Marking Information
6-Lead SC-70*
(Front)
Example
XXX
62P
6-Lead SC-70*
(Back)
Example
6-Lead TSOT-23*
(Back)
Example
NNN
54S
NNN
7OK
Legend: XX...X
Y
YY
WW
NNN
e3
*
6-Lead TSOT-23*
(Front)
XXXX
Example
602P
Product code or customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
●, ▲, ▼ Pin one index is identified by a dot, delta up, or delta down (triangle
mark).
Note:
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information. Package may or may not include
the corporate logo.
Underbar (_) symbol may not be to scale.
Note:
If the full seven-character YYWWNNN code cannot fit on the package, the following truncated codes are
used based on the available marking space:
6 Characters = YWWNNN; 5 Characters = WWNNN; 4 Characters = WNNN; 3 Characters = NNN;
2 Characters = NN; 1 Character = N
DS20006695A-page 12
2022 Microchip Technology Inc. and its subsidiaries
MIC2860-2P
6-Lead SC-70 Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
2022 Microchip Technology Inc. and its subsidiaries
DS20006695A-page 13
MIC2860-2P
6-Lead Thin SOT-23 Package Outline and Recommended Land Pattern
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging.
DS20006695A-page 14
2022 Microchip Technology Inc. and its subsidiaries
MIC2860-2P
APPENDIX A:
REVISION HISTORY
Revision A (June 2022)
• Converted Micrel document MIC2860-2P to
Microchip data sheet DS20006695A.
• Minor text changes throughout.
2022 Microchip Technology Inc. and its subsidiaries
DS20006695A-page 15
MIC2860-2P
NOTES:
DS20006695A-page 16
2022 Microchip Technology Inc. and its subsidiaries
MIC2860-2P
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
Part Number
X
XX
-XX
Device
Temp.
Range
Package
Media Type
Device:
MIC2860-2P:
High Efficiency 2-Channel WLED Driver
with PWM Control
Temperature
Range:
Y
=
–40°C to +125°C
Package:
C6
D6
=
=
6-Lead SC-70
6-Lead Thin SOT-23
Media Type:
TR
=
3,000/Reel
2022 Microchip Technology Inc. and its subsidiaries
Examples:
a) MIC2860-2PYC6-TR:
MIC2860-2P, –40°C to +125°C
Temp. Range, 6-Lead SC-70,
3,000/Reel
b) MIC2860-2PYD6-TR:
MIC2860-2P, –40°C to +125°C
Temp. Range, 6-Lead TSOT-23,
3,000/Reel
Note 1:
Tape and Reel identifier only appears in the
catalog part number description. This identifier is
used for ordering purposes and is not printed on
the device package. Check with your Microchip
Sales Office for package availability with the Tape
and Reel option.
DS20006695A-page 17
MIC2860-2P
NOTES:
DS20006695A-page 18
2022 Microchip Technology Inc. and its subsidiaries
Note the following details of the code protection feature on Microchip products:
•
Microchip products meet the specifications contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is secure when used in the intended manner, within operating specifications, and
under normal conditions.
•
Microchip values and aggressively protects its intellectual property rights. Attempts to breach the code protection features of
Microchip product is strictly prohibited and may violate the Digital Millennium Copyright Act.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of its code. Code protection does not
mean that we are guaranteeing the product is "unbreakable" Code protection is constantly evolving. Microchip is committed to
continuously improving the code protection features of our products.
This publication and the information herein may be used only
with Microchip products, including to design, test, and integrate
Microchip products with your application. Use of this information in any other manner violates these terms. Information
regarding device applications is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your
specifications. Contact your local Microchip sales office for
additional support or, obtain additional support at https://
www.microchip.com/en-us/support/design-help/client-supportservices.
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ISBN: 978-1-6683-0622-2
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2022 Microchip Technology Inc. and its subsidiaries
DS20006695A-page 19
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Tel: 91-11-4160-8631
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
China - Chengdu
Tel: 86-28-8665-5511
India - Pune
Tel: 91-20-4121-0141
China - Chongqing
Tel: 86-23-8980-9588
Japan - Osaka
Tel: 81-6-6152-7160
China - Dongguan
Tel: 86-769-8702-9880
Japan - Tokyo
Tel: 81-3-6880- 3770
China - Guangzhou
Tel: 86-20-8755-8029
Korea - Daegu
Tel: 82-53-744-4301
China - Hangzhou
Tel: 86-571-8792-8115
Korea - Seoul
Tel: 82-2-554-7200
China - Hong Kong SAR
Tel: 852-2943-5100
Malaysia - Kuala Lumpur
Tel: 60-3-7651-7906
China - Nanjing
Tel: 86-25-8473-2460
Malaysia - Penang
Tel: 60-4-227-8870
China - Qingdao
Tel: 86-532-8502-7355
Philippines - Manila
Tel: 63-2-634-9065
China - Shanghai
Tel: 86-21-3326-8000
Singapore
Tel: 65-6334-8870
China - Shenyang
Tel: 86-24-2334-2829
Taiwan - Hsin Chu
Tel: 886-3-577-8366
China - Shenzhen
Tel: 86-755-8864-2200
Taiwan - Kaohsiung
Tel: 886-7-213-7830
China - Suzhou
Tel: 86-186-6233-1526
Taiwan - Taipei
Tel: 886-2-2508-8600
China - Wuhan
Tel: 86-27-5980-5300
Thailand - Bangkok
Tel: 66-2-694-1351
China - Xian
Tel: 86-29-8833-7252
Vietnam - Ho Chi Minh
Tel: 84-28-5448-2100
Atlanta
Duluth, GA
Tel: 678-957-9614
Fax: 678-957-1455
Austin, TX
Tel: 512-257-3370
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Detroit
Novi, MI
Tel: 248-848-4000
Houston, TX
Tel: 281-894-5983
Indianapolis
Noblesville, IN
Tel: 317-773-8323
Fax: 317-773-5453
Tel: 317-536-2380
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
Tel: 951-273-7800
Raleigh, NC
Tel: 919-844-7510
New York, NY
Tel: 631-435-6000
San Jose, CA
Tel: 408-735-9110
Tel: 408-436-4270
Canada - Toronto
Tel: 905-695-1980
Fax: 905-695-2078
DS20006695A-page 20
China - Xiamen
Tel: 86-592-2388138
China - Zhuhai
Tel: 86-756-3210040
Denmark - Copenhagen
Tel: 45-4485-5910
Fax: 45-4485-2829
Finland - Espoo
Tel: 358-9-4520-820
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Germany - Garching
Tel: 49-8931-9700
Germany - Haan
Tel: 49-2129-3766400
Germany - Heilbronn
Tel: 49-7131-72400
Germany - Karlsruhe
Tel: 49-721-625370
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Germany - Rosenheim
Tel: 49-8031-354-560
Israel - Ra’anana
Tel: 972-9-744-7705
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Italy - Padova
Tel: 39-049-7625286
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Norway - Trondheim
Tel: 47-7288-4388
Poland - Warsaw
Tel: 48-22-3325737
Romania - Bucharest
Tel: 40-21-407-87-50
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
Sweden - Gothenberg
Tel: 46-31-704-60-40
Sweden - Stockholm
Tel: 46-8-5090-4654
UK - Wokingham
Tel: 44-118-921-5800
Fax: 44-118-921-5820
2022 Microchip Technology Inc. and its subsidiaries
09/14/21
