MIC2860-2PYC6 [MICREL]
High Efficiency 2 Channel WLED Driver with PWM Control; 高效率双通道WLED驱动器，带有PWM控制
| 型号： | MIC2860-2PYC6 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | High Efficiency 2 Channel WLED Driver with PWM Control |
| 文件： | 总12页 (文件大小：497K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC2860-P
High Efficiency 2 Channel WLED Driver
with PWM Control
General Description
Features
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 52mV at 30.2mA 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 250Hz
• Input voltage range: 3.0V to 5.5V
• Linear driver dropout of 52mV at 30.2mA
• 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
The two channels have typical matching of ≤ ±0.5%, which
ensures uniform display illumination under all conditions.
The WLEDs brightness is externally preset by a resistor
and dimmed using PWM interface operating down to less
than 1% duty cycle.
• Digital cameras
• Portable media/MP3 players
• Portable navigation devices (GPS)
• Portable applications
The MIC2860-2P is available in Thin SOT-23 and SC-70
six pin packages with a junction temperature range of
−40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
____________________________________________________________________________________________________________
Typical Application
LCD Display Backlight with 2 WLEDs
MLF and MicroLeadFrame are registered trademark Amkor Technology Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2010
M9999-092710-A
Micrel Inc.
MIC2860-2P
Ordering Information
Part Number
Mark Code(1)
Junction Temperature Range
Package(2)
MIC2860-2PYC6
MIC2860-2PYD6
Notes:
62P
–40°C to +125°C
–40°C to +125°C
6-Pin SC-70
602P
6-Pin Thin SOT-23
1. Under bar symbol ( _ ) may not be to scale.
2. Package is GREEN RoHS compliant. Lead finish is NiPdAu. Mold compound is halogen free.
Pin Configuration
6-Pin SC-70 (C6)
(Top View)
6-Pin Thin SOT-23 (D6)
(Top View)
Pin Description
Pin Number
Pin Name
Pin Function
MIC2860-2P
1
2
3
4
PWM Control Pin. This pin is used as a PWM input for dimming of WLEDs. Do not leave floating.
Ground.
EN
GND
VIN
D2
Voltage Input. Connect at least 1µF ceramic capacitor between VIN and GND.
LED2 driver. Connect LED anode to VIN and cathode to this pin. Do not leave floating.
An internal 1.27V reference sets the nominal maximum WLED current. Example, apply a 9.53kΩ
resistor between RSET and GND to set LED current to 30.2mA at 100% duty cycle.
5
6
RSET
D1
LED1 driver. Connect LED anode to VIN and cathode to this pin. Do not leave floating.
September 2010
2
M9999-092710-A
Micrel Inc.
MIC2860-2P
Absolute Maximum Ratings(1)
Operating Ratings(2)
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
Lead Temperature (soldering, 10sec.)....................... 260°C
Storage Temperature (Ts) .........................–65°C to +150°C
ESD Rating.................................................................... 2KV
Supply Voltage (VIN)..................................... +3.0V to +5.5V
Enable Input Voltage (VEN) .................................... 0V to VIN
LED Driver Voltage (VD1, D2) .................................. 0V to VIN
Junction Temperature (TJ) ........................–40°C to +125°C
Junction Thermal Resistance
SC-70 (θJA).....................................................256 °C /W
SOT-23 (θJA)..................................................177 °C /W
Electrical Characteristics
WLED Linear Drivers
VIN = VEN = 3.6V, CIN = 1µF, RSET = 9.53kΩ; VD1, D2 = 0.6V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ 85°C; unless noted.
Parameter
Current Accuracy(3)
Matching(4)
Conditions
Min.
Typ.
30.2
±0.5
Max.
33.22
±3
Units
mA
%
27.18
Where ILED = 90% of LED current seen at
VDROPNOM = 0.6V, 100% brightness level
52
125
mV
Drop-Out (VD1,D2
)
Ground/Supply Bias Current
Shutdown Current (current source leakage)
PWM Dimming
IOUT = 30.2mA
VEN = 0V
0.7
1.5
mA
µA
0.01
1
Logic Low
Logic High
VEN ≥1.4
0.4
V
V
Enable Input Voltage (VEN
)
1.4
Enable Input Current
0.01
1
µA
Shutdown to On
Standby to On
On to Standby
80
4
32
1.5
0.3
Current-Source Delay (50% levels)
µs
TRISE
TFALL
0.7
0.2
Current-Source Transient Time (10%−90%)
µs
On-to-Shutdown Time
VEN = 0V
4
5.8
10
ms
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. As determined by average current of all channels in use and all channels loaded.
4. The current through each LED meets the stated limits from the average current of all LEDs.
September 2010
3
M9999-092710-A
Micrel Inc.
MIC2860-2P
Typical Characteristics
Dropout Voltage
vs. Temperature
Peak LED Current
Dropout Voltage
vs. RSET
vs. RSET
70
60
50
40
30
20
10
0
35
70
60
50
40
30
20
10
0
30
25
20
15
10
5
LED1
LED1
LED2
LED2
RSET = 9.53Kꢀ
0
5
10
15
20
25
30
35
-40 -20
0
20
40
60
80 100 120
0
10
20
30
40
RSET (KΩ)
RSET (KΩ)
TEMPERATURE (°C)
LED Current
vs. Temperature
Dropout Voltage
vs. Temperature
LED Current
vs.Temperature
35
30
25
20
15
10
5
32
16
31.5
31
15.5
15
LED2
LED1
ILED1
LED1
LED2
30.5
30
ILED2
14.5
14
29.5
29
13.5
13
28.5
28
RSET = 9.53Kꢀ
RSET = 19.1Kꢀ
60 80 100 120
RSET = 19.1Kꢀ
60 80 100 120
0
-40 -20
0
20
40
-40 -20
0
20
40
60
80 100 120
-40 -20
0
20
40
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
Matching
vs. Temperature
0.4
0.35
0.3
0.25
0.2
RSET = 9.53Kꢀ
0.15
0.1
RSET = 19.1Kꢀ
0.05
0
-40 -20
0
20
40
60
80 100 120
TEMPERATURE (°C)
September 2010
4
M9999-092710-A
Micrel Inc.
MIC2860-2P
Functional Characteristics
September 2010
5
M9999-092710-A
Micrel Inc.
MIC2860-2P
Functional Characteristics (Continued)
September 2010
6
M9999-092710-A
Micrel Inc.
MIC2860-2P
Functional Diagram
Figure 1. MIC2860-2P Functional Block Diagram
September 2010
7
M9999-092710-A
Micrel Inc.
MIC2860-2P
Functional Description
Peak LED Current
vs. RSET
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 52mV at 30.2mA.
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.
35
30
25
20
15
10
5
0
8
12
16
20
24
28
32
Block Diagram
RSET (kꢀ)
As shown in Figure 1, the MIC2860-2P consists of two
current sinks with the peak current determined by RSET
.
Figure 2. Peak LED Current vs. 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.
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.
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 1µF should be placed close to input (VIN)
pin and the ground (GND) pin.
EN
GND
The EN pin enables the linear drivers. It can also be
used for dimming with a PWM signal. See the PWM
Dimming Interface in the Application Information section
for details. Do not leave floating.
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:
R
SET (kꢀ)
9.53
ILED (mA)
30.2
11.5
25.0
14.3
20.1
15.8
18.2
19.1
15.1
28.7
10.0
Table 1. Maximum LED Current vs. RSET Resistor Values
A plot of ILED versus RSET is shown in Figure 2.
September 2010
8
M9999-092710-A
Micrel Inc.
MIC2860-2P
Input Capacitor
Application Information
The MIC2860-2P is a high performance, high bandwidth
device. Stability can be maintained using a ceramic input
capacitor of 1µF. 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.
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
250Hz due to the minimum standby to shutdown time of
4ms. As the period of 250Hz is 4ms, a 1% duty cycle
would have an on time of 40us and an off time of
3.96ms. To support operation down to 1% duty cycle,
the maximum off time must not exceed 4ms or the
drivers may go into the low Iq shutdown state.
With PWM frequencies higher than 500Hz the TRISE
(0.7μs) and TFall (0.2μs) times will have a greater effect
on the accuracy of the outputs. An upper frequency of
500Hz 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% (3.02mA with RSET = 9.53kꢀ) the PWM
frequency can be increased to 10kHz and still maintain
accuracy.
September 2010
9
M9999-092710-A
Micrel Inc.
MIC2860-2P
MIC2860-2P Typical Application Circuit
Bill of Materials
Item
C1
Part Number
Manufacturer
TDK(1)
Description
Qty.
1
C1608X5R0J105K
CRCW06032052FT1
1µF Ceramic Capacitor, 6.3V, X5R, Size 0603
9.53kꢀ, 1%, Size 0603
R1
Vishay(2)
1
MIC2860-2PYC6
MIC2860-2PYD6
2-Channel PWM Linear WLED Driver, SC-70
2-Channel PWM Linear WLED Driver, SOT-23
U1
Micrel, Inc.(3)
1
Notes:
1. TDK: www.tdk.com.
2. Vishay: www.vishay.com.
3. Micrel, Inc.: www.micrel.com.
September 2010
10
M9999-092710-A
Micrel Inc.
MIC2860-2P
Package Information
6-Pin SC-70 (C6)
September 2010
11
M9999-092710-A
Micrel Inc.
MIC2860-2P
Package Information (Continued)
6-Pin Thin SOT-23 (D6)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical
implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2010 Micrel, Incorporated.
September 2010
12
M9999-092710-A
相关型号：
SI9130DB
5- and 3.3-V Step-Down Synchronous ConvertersWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135LG-T1-E3
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9135_11
SMBus Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9136_11
Multi-Output Power-Supply ControllerWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130CG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130LG-T1-E3
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9130_11
Pin-Programmable Dual Controller - Portable PCsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137DB
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9137LG
Multi-Output, Sequence Selectable Power-Supply Controller for Mobile ApplicationsWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
SI9122E
500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification DriversWarning: Undefined variable $rtag in /www/wwwroot/website_ic37/www.icpdf.com/pdf/pdf/index.php on line 217
-
VISHAY
©2020 ICPDF网 联系我们和版权申明