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MIC2287YD5TR [MICROCHIP]

LED DISPLAY DRIVER, PDSO5, LEAD FREE, TSOT-23, 5 PIN;
MIC2287YD5TR
型号： MIC2287YD5TR
厂家： MICROCHIP    MICROCHIP
描述：

LED DISPLAY DRIVER, PDSO5, LEAD FREE, TSOT-23, 5 PIN

驱动 光电二极管 接口集成电路
文件： 总10页 (文件大小：395K)
中文：  中文翻译
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MIC2287  
1.2MHz PWM White LED Driver with OVP in  
2mm × 2mm MLF™ and Thin SOT-23  
General Description  
Features  
The MIC2287 is a 1.2MHz pulse width modulated (PWM),  
boost-switching regulator that is optimized for constant-  
current, white LED driver applications. With a maximum  
output voltage of 34V and a switch current of over 500mA,  
the MIC2287 easily drives a string of up to 8 white LEDs in  
series, ensuring uniform brightness and eliminating several  
ballast resistors.  
• 2.5V to 10V input voltage  
• Output voltage up to 34V  
• Over 500mA switch current  
• 1.2 MHz PWM operation  
• 95mV feedback voltage  
• Output Overvoltage Protection (OVP)  
• Options for 15V, 24V, and 34V OVP  
• <1% line and load regulation  
• <1µA shutdown current  
• Over-temperature protection  
• UVLO  
• Low profile Thin SOT-23-5 package option  
• 8-lead 2mm × 2mm MLF™ package option  
• –40°C to +125°C junction temperature range  
The MIC2287 implements a constant frequency, 1.2MHz  
PWM control scheme. The high frequency PWM operation  
saves board space by reducing external component sizes.  
The added benefit of the constant frequency PWM scheme  
as opposed to variable frequency topologies is much lower  
noise and input ripple injected back to the battery source.  
To optimize efficiency, the feedback voltage is set to only  
95mV. This reduces the power dissipation in the current set  
resistor and allows the lowest total output voltage, hence  
minimal current draw from the battery.  
Applications  
• White LED driver for backlighting:  
- Cell phones  
The MIC2287 is available with 3 levels of overvoltage protec-  
tion, 15V, 24V, and 34V. This allows designers to choose the  
smallest possible external components with the appropriate  
voltage ratings for their applications.  
- PDAs  
- GPS systems  
- Digital cameras  
- MP3 players  
- IP phones  
• Photo flash LED driver  
• LED flashlights  
• Constant current power supplies  
TheMIC2287isavailableinlowprofileThinSOT-235-leadand  
an8-lead2mm×2mmMLF™packageoptions.TheMIC2287  
has a junction temperature range of –40°C to +125°C.  
All support documentation can be found on Micrel’s web site  
at www.micrel.com.  
Typical Application  
CMDSH-3  
10µH  
CMDSH-3  
10µH  
MIC2287BD5  
MIC2287-34BML  
5
4
1
3
VIN  
SW  
VIN  
EN  
SW  
1-Cell  
Li Ion  
1µF  
1-Cell  
Li Ion  
1µF  
0.22µF  
OVP  
0.22µF  
FB  
EN  
95mV  
6.3Ω  
FB  
95mV  
6.3Ω  
GND  
GND  
2
3-Series White LED Driver in Thin SOT-23  
6-Series White LED Driver  
with Output OVP in 2mm × 2mm MLF™-8  
MLF and MicroLeadFrame are trademarks of 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  
M9999-070105  
July 2005  
1
MIC2287  
Micrel, Inc.  
Ordering Information  
Marking  
Overvoltage  
Protection  
Junction  
Temp. Range  
Part Number  
Code  
SGAA  
SGAA  
SLA  
Package  
Lead Finish  
Standard  
Lead Free  
Standard  
Lead Free  
Standard  
Lead Free  
Standard  
Lead Free  
MIC2287BD5  
N/A  
N/A  
15V  
15V  
24V  
24V  
34V  
34V  
–40°C to 125°C  
–40°C to 125°C  
Thin SOT-23-5  
Thin SOT-23-5  
MIC2287YD5  
MIC2287-15BML  
MIC2287-15YML  
MIC2287-24BML  
MIC2287-24YML  
MIC2287-34BML  
MIC2287-34YML  
–40°C to 125°C 2mm x 2mm MLF™  
–40°C to 125°C 2mm x 2mm MLF™  
–40°C to 125°C 2mm x 2mm MLF™  
–40°C to 125°C 2mm x 2mm MLF™  
–40°C to 125°C 2mm x 2mm MLF™  
–40°C to 125°C 2mm x 2mm MLF™  
SLA  
SLB  
SLB  
SLC  
SLC  
Pin Configuration  
FB GND SW  
1
3
2
OUT  
1
2
3
8
GND  
SW  
FB  
VIN  
EN  
7
6
5
4
5
EN  
VIN  
GND  
4
EP  
NC  
TSOT-23-5 (BD5)  
8-Pin MLF™ (BML)  
(Top View)  
Fused Lead Frame  
Pin Description  
Pin Number  
Pin Number  
TSOT-23-5 2mm ×2mm MLF™ Pin Name  
Pin Function  
1
2
3
7
SW  
GND  
FB  
Switch node (Input): Internal power BIPOLAR collector.  
Ground (Return): Ground.  
6
3
Feedback (Input): Output voltage sense node. Connect the cathode of the  
LED to this pin. A resistor from this pin to ground sets the LED current.  
4
EN  
Enable (Input): Logic high enables regulator. Logic low shuts down regula-  
tor.  
5
2
1
VIN  
OVP  
AGND  
PGND  
NC  
Supply (Input): 2.5V to 10V for internal circuitry.  
Overvoltage protection (Input): Connect to the output.  
Analog ground.  
—
—
—
—
—
4
8
Power ground.  
5
No connect (no internal connection to die).  
Ground (Return): Exposed backside pad.  
EP  
GND  
M9999-070105  
2
July 2005  
MIC2287  
Micrel, Inc.  
Absolute Maximum Ratings(1)  
Operating Ratings(2)  
Supply Voltage (V ) .....................................................12V  
Supply Voltage (V )..........................................2.5V to 10V  
IN  
IN  
Switch Voltage (V ) ......................................–0.3V to 34V  
Junction Temperature Range (T ) ............ –40°C to +125°C  
SW  
J
Enable Pin Voltage (V ) ................................... –0.3 to V  
Package Thermal Impedance  
EN  
IN  
FB Voltage (V ) .............................................................6V  
2mm × 2mmMLF™ (θ ) .....................................93°C/W  
FB  
JA  
Switch Current (I )........................................................ 2A  
Thin SOT-23-5 (θ ) .........................................256°C/W  
SW  
JA  
Ambient Storage Temperature (T ).......... –65°C to +150°C  
S
(3)  
ESD Rating ............................................................... 2kV  
Electrical Characteristics(4)  
TA = 25°C, VIN = VEN = 3.6V, VOUT = 10V, IOUT = 10mA, unless otherwise noted. Bold values indicate –40°C ≤ TJ ≤125°C.  
Symbol  
VIN  
Parameter  
Condition  
Min  
2.5  
1.8  
Typ  
Max  
10  
2.4  
5
Units  
V
Supply Voltage Range  
Under Voltage Lockout  
Quiescent Current  
Shutdown Current  
Feedback Voltage  
VUVLO  
IVIN  
2.1  
2.5  
V
VFB > 200mV, (not switching)  
VEN = 0V(5)  
mA  
µA  
mV  
nA  
%
ISD  
0.1  
1
VFB  
(±5%)  
90  
95  
100  
IFB  
Feedback Input Current  
Line Regulation(6)  
VFB = 95mV  
–450  
0.5  
3V ≤ VIN ≤ 5V  
1
2
Load Regulation(6)  
Maximum Duty Cycle  
Switch Current Limit  
Switch Saturation Voltage  
Switch Leakage Current  
Enable Threshold  
5mA ≤ IOUT ≤ 20mA  
0.5  
%
DMAX  
ISW  
VSW  
ISW  
85  
90  
%
750  
450  
0.01  
mA  
mV  
µA  
ISW = 0.5A  
VEN = 0V, VSW = 10V  
5
VEN  
TURN ON  
TURN OFF  
1.5  
V
V
0.4  
40  
IEN  
Enable Pin Current  
Oscillator Frequency  
Overvoltage Protection  
VEN = 10V  
20  
µA  
fSW  
1.05  
1.2  
1.35  
MHz  
VOVP  
MIC2287BML- 15 only  
MIC2287BML- 24 only  
MIC2287BML- 34 only  
13  
21  
30  
14  
22.5  
32  
16  
24  
34  
V
V
V
TJ  
Overtemperature  
Threshold Shutdown  
150  
10  
°C  
°C  
Hysteresis  
Notes:  
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating  
the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max),  
the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power dissipation will result in excessive  
die temperature, and the regulator will go into thermal shutdown.  
2. This device is not guaranteed to operate beyond its specified operating ratings.  
3. Devices are inherently ESD sensitive. Handling precautions required. Human body model.  
4. Specification for packaged product only.  
5. ISD = IVIN  
.
6. Guaranteed by design.  
July 2005  
3
M9999-070105  
MIC2287  
Micrel, Inc.  
Typical Characteristics  
Feedback Voltage  
vs. Input Voltage  
100  
Shutdown Current  
vs. Input Voltage  
Quiescent Current  
vs. Input Voltage  
5
4
3
2
1
0
5
4
3
2
1
0
99  
98  
97  
96  
95  
94  
93  
92  
91  
90  
0
2
4
6
8
10 12  
0
2
4
6
8
10 12  
0
2
4
6
8
10 12  
VIN (V)  
VIN (V)  
VIN (V)  
6 Series LED Efficiency  
3 Series LED Efficiency  
Switch Frequency  
vs. Temperature  
1.4  
1.2  
1
VIN = 4.2V  
84  
82  
80  
78  
76  
74  
72  
70  
84  
82  
80  
78  
76  
74  
VIN = 3.0V  
VIN = 3.6V  
0.8  
0.6  
0.4  
VIN = 3.0V  
VIN = 3.6V  
VIN = 4.2V  
L = 10µH  
COUT = 0.22µF  
L = 10µH  
COUT = 0.22µF  
72  
70  
0.2  
0
10  
IOUT (mA)  
15  
20  
25  
0
5
0
5
10  
15  
20  
25  
0
40  
80  
120  
-40  
TEMPERATURE (°C)  
IOUT (mA)  
EN Pin Bias Currency  
vs. Temperature  
Saturation Voltage  
vs. Temperature  
Current Limit  
vs. Temperature  
50  
45  
40  
35  
30  
25  
20  
15  
550  
900  
850  
800  
750  
700  
650  
600  
500  
450  
400  
IEN = 10V  
IEN = 4.2V  
IEN = 3.0V  
IEN = 3.6V  
10  
5
0
350  
300  
ISW = 500mA  
V
= 2.5  
0
V
IN  
0
50  
100  
-50  
0
40  
80  
120  
-40  
-40  
40  
80  
120  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
Switch Saturation Voltage  
vs. Current  
600  
500  
400  
300  
200  
VIN = 2.5V  
VIN = 5V  
100  
0
0
100 200 300 400 500  
ISW (mA)  
M9999-070105  
4
July 2005  
MIC2287  
Micrel, Inc.  
Functional Diagram  
VIN  
FB  
OVP*  
EN  
OVP*  
SW  
PWM  
Generator  
gm  
VREF  
95mV  
S
GND  
1.2MHz  
Ramp  
Oscillator  
Generator  
*
OVP available on MLFTM package option only  
MIC2287 Block Diagram  
The g error amplifier measures the LED current through the  
external sense resistor and amplifies the error between the  
detected signal and the 95mV reference voltage. The output  
Functional Description  
The MIC2287 is a constant frequency, PWM current mode  
boost regulator. The block diagram is shown above. The  
MIC2287 is composed of an oscillator, slope compensation  
m
of the g error amplifier provides the voltage-loop signal  
m
that is fed to the other input of the PWM generator. When  
the current-loop signal exceeds the voltage-loop signal, the  
PWM generator turns off the bipolar output transistor. The  
next clock period initiates the next switching cycle, maintain-  
ing the constant frequency current-mode PWM control. The  
LED is set by the feedback resistor:  
ramp generator, current amplifier, g error amplifier, PWM  
m
generator, and a 500mA bipolar output transistor. The oscil-  
lator generates a 1.2MHz clock. The clock’s two functions  
are to trigger the PWM generator that turns on the output  
transistor and to reset the slope compensation ramp genera-  
tor. The current amplifier is used to measure the switch cur-  
rent by amplifying the voltage signal from the internal sense  
resistor. The output of the current amplifier is summed with  
the output of the slope compensation ramp generator. This  
summed current-loop signal is fed to one of the inputs of the  
PWM generator.  
95mv  
I
=
LED  
R
FB  
The Enable pin shuts down the output switching and disables  
control circuitry to reduce input current-to-leakage levels.  
Enable pin input current is zero at zero volts.  
July 2005  
5
M9999-070105  
MIC2287  
Micrel, Inc.  
The table below shows recommended inductor and output  
capacitor values for various series-LED applications.  
External Component Selection  
TheMIC2287canbeusedacrossawiderageofapplications.  
Series LEDs  
L
Manufacturer  
Min COUT  
Manufacturer  
2
22µH  
LQH32CN220K21 (Murata)  
NLC453232T-220K(TDK)  
2.2µF  
0805ZD225KAT(AVX)  
GRM40X5R225K10(Murata)  
15µH  
10µH  
6.8µH  
4.7µH  
22µH  
15µH  
10µH  
6.8µH  
4.7µH  
22µH  
15µH  
10µH  
6.8µH  
4.7µH  
22µH  
15µH  
10µH  
6.8µH  
4.7µH  
22µH  
15µH  
10µH  
6.8µH  
4.7µH  
LQH32CN150K21 (Murata)  
NLC453232T-150K(TDK)  
1µF  
0805ZD105KAT(AVX)  
GRM40X5R105K10(Murata)  
LQH32CN100K21 (Murata)  
NLC453232T-100K(TDK)  
0.22µF  
0.22µF  
0.22µF  
2.2µF  
0805ZD224KAT(AVX)  
GRM40X5R224K10(Murata)  
LQH32CN6R8K21 (Murata)  
NLC453232T-6R8K(TDK)  
0805ZD225KAT(AVX)  
GRM40X5R225K10(Murata)  
LQH32CN4R7K21 (Murata)  
NLC453232T-4R7K(TDK)  
0805ZD224KAT(AVX)  
GRM40X5R224K10(Murata)  
3
LQH43MN220K21 (Murata)  
NLC453232T-220K(TDK)  
0805YD225MAT(AVX)  
GRM40X5R225K16(Murata)  
LQH43MN 150K21 (Murata)  
NLC453232T-150K(TDK)  
1µF  
0805YD105MAT(AVX)  
GRM40X5R105K16(Murata)  
LQH43MN 100K21 (Murata)  
NLC453232T-100K(TDK)  
0.22µF  
0.22µF  
0.27µF  
1µF  
0805YD224MAT(AVX)  
GRM40X5R224K16(Murata)  
LQH43MN 6R8K21 (Murata)  
NLC453232T-6R8K(TDK)  
0805YD224MAT(AVX)  
GRM40X5R224K16(Murata)  
LQH43MN 4R7K21 (Murata)  
NLC453232T-4R7K(TDK)  
0805YD274MAT(AVX)  
GRM40X5R224K16(Murata)  
4
LQH43MN220K21 (Murata)  
NLC453232T-220K(TDK)  
0805YD105MAT(AVX)  
GRM40X5R105K25(Murata)  
LQH43MN 150K21 (Murata)  
NLC453232T-150K(TDK)  
1µF  
0805YD105MAT(AVX)  
GRM40X5R105K25(Murata)  
LQH43MN 100K21 (Murata)  
NLC453232T-100K(TDK)  
0.27µF  
0.27µF  
0.27µF  
0.22µF  
0.22µF  
0.27µF  
0.27µF  
0.27µF  
0.22µF  
0.22µF  
0.27µF  
0.27µF  
0.27µF  
0805YD274MAT(AVX)  
GRM40X5R274K25(Murata)  
LQH43MN 6R8K21 (Murata)  
NLC453232T-6R8K(TDK)  
0805YD274MAT(AVX)  
GRM40X5R274K25(Murata)  
LQH43MN 4R7K21 (Murata)  
NLC453232T-4R7K(TDK)  
0805YD274MAT(AVX)  
GRM40X5R274K25(Murata)  
5, 6  
LQH43MN220K21 (Murata)  
NLC453232T-220K(TDK)  
08053D224MAT(AVX)  
GRM40X5R224K25(Murata)  
LQH43MN 150K21 (Murata)  
NLC453232T-150K(TDK)  
08053D224MAT(AVX)  
GRM40X5R224K25(Murata)  
LQH43MN 100K21 (Murata)  
NLC453232T-100K(TDK)  
08053D274MAT(AVX)  
GRM40X5R274K25(Murata)  
LQH43MN 6R8K21 (Murata)  
NLC453232T-6R8K(TDK)  
08053D274MAT(AVX)  
GRM40X5R274K25(Murata)  
LQH43MN 4R7K21 (Murata)  
NLC453232T-4R7K(TDK)  
08053D274MAT(AVX)  
GRM40X5R274K25(Murata)  
7, 8  
LQH43MN220K21 (Murata)  
NLC453232T-220K(TDK)  
08053D224MAT(AVX)  
GRM40X5R224K25(Murata)  
LQH43MN 150K21 (Murata)  
NLC453232T-150K(TDK)  
08053D224MAT(AVX)  
GRM40X5R224K25(Murata)  
LQH43MN 100K21 (Murata)  
NLC453232T-100K(TDK)  
08053D274MAT(AVX)  
GRM40X5R274K25(Murata)  
LQH43MN 6R8K21 (Murata)  
NLC453232T-6R8K(TDK)  
08053D274MAT(AVX)  
GRM40X5R274K25(Murata)  
LQH43MN 4R7K21 (Murata)  
NLC453232T-4R7K(TDK)  
08053D274MAT(AVX)  
GRM40X5R274K25(Murata)  
M9999-070105  
6
July 2005  
MIC2287  
Micrel, Inc.  
Dimming Control  
options for 15V, 24V, or 34V (see Figure 3). The reason for  
the three OVP levels is to let users choose the suitable level  
ofOVPfortheirapplication.Forexample,a3-LEDapplication  
would typically see an output voltage of no more than 12V, so  
a 15V OVP option would offer a suitable level of protection.  
This allows the user to select the output diode and capacitor  
with the lowest voltage ratings, as well as smallest size and  
lowest cost. The OVP will clamp the output voltage to within  
the specified limits. For the Thin SOT-23-5 package, an OVP  
pinisnotavailable.Anexternalzenerdiodecanbeconnected  
from the output of the converter to FB pin as shown in Figure  
4. to implement similar protection.  
There are two techniques for dimming control. One is PWM  
dimming, and the other is continuous dimming.  
1. PWM dimming control is implemented by applying  
a PWM signal on EN pin as shown in Figure 1. The  
MIC2287 is turned on and off by the PWM signal.  
Withthismethod,theLEDsoperatewitheitherzero  
orfullcurrent.TheaverageLEDcurrentisincreased  
proportionally to the duty-cycle of the PWM signal.  
This technique has high-efficiency because the IC  
and the LEDs consume no current during the off  
cycle of the PWM signal. Typical PWM frequency  
should be between 100Hz and 10kHz.  
VIN  
2. Continuous dimming control is implemented by  
applying a DC control voltage to the FB pin of the  
MIC2287 through a series resistor as shown in  
Figure 2. The LED intensity (current) can be dy-  
namically varied applying a DC voltage to the FB  
pin. The DC voltage can come from a DAC signal,  
or a filtered PWM signal. The advantage of this ap-  
proach is a high frequency PWM signal (>10kHz)  
VIN  
EN  
SW  
FB  
GND OVP  
that can be used to control LED intensity.  
VIN  
Figure 3. MLF™ Package OVP Circuit  
VIN  
VIN  
EN  
SW  
FB  
VIN  
EN  
SW  
FB  
PWM  
5.11k  
GND  
GND  
Figure 1. PWM Dimming Method  
Figure 4. Thin SOT-23 Package OVP Circuit  
Start-Up and Inrush Current  
VIN  
During start-up, inrush current of approximately double the  
nominal current flows to set up the inductor current and the  
voltage on the output capacitor. If the inrush current needs  
to be limited, a soft-start circuit similar to Figure 5 could be  
VIN  
EN  
SW  
FB  
5.11k  
49.9k  
implemented. The soft-start capacitor, C , provides over-  
SS  
GND  
drive to the FB pin at start-up, resulting in gradual increase  
of switch duty cycle and limited inrush current.  
DC  
Equivalent  
VIN  
CSS  
2200pF  
Figure 2. Continuous Dimming  
Open-Circuit Protection  
VIN  
EN  
SW  
FB  
If the LEDs are disconnected from the circuit, or in case  
an LED fails open, the sense resistor will pull the FB pin to  
ground. This will cause the MIC2287 to switch with a high  
duty-cycle, resulting in output overvoltage. This may cause  
the SW pin voltage to exceed its maximum voltage rating,  
possibly damaging the IC and the external components. To  
ensure the highest level of protection, the MIC2287 has 3  
product options in the 8-lead 2mm × 2mm MLF™ with over-  
voltage protection (OVP). The extra pins of the 8-lead 2mm  
× 2mm MLF™ package allow a dedicated OVP monitor with  
R
10k  
GND  
Figure 5. Soft-Start Circuit  
July 2005  
7
M9999-070105  
MIC2287  
Micrel, Inc.  
6-Series LED Circuit with External Soft-Start  
6-Series LED Circuit without External Soft-Start  
L = 10µH  
L = 10µH  
CIN = 1µF  
CIN = 1µF  
COUT = 0.22µF  
VIN = 3.6V  
COUT = 0.22µF  
VIN = 3.6V  
IOUT = 20mA  
6 LEDs  
IOUT = 20mA  
6 LEDs  
CSS = 2200pF  
R = 10kW  
TIME (100µs/div.)  
TIME (100µs/div.)  
M9999-070105  
8
July 2005  
MIC2287  
Micrel, Inc.  
Package Information  
5-Pin TSOT (BD5)  
8-Pin MLF™ (BML)  
July 2005  
9
M9999-070105  
MIC2287  
Micrel, Inc.  
Recommended Land Pattern for MLF™ 2×2 8 Lead  
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  
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use.  
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.  
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.  
© 2004 Micrel, Inc.  
M9999-070105  
10  
July 2005  

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