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MIC2287-15YML-TR

P1-P3P4-P6P7-P9P10-P10
July 2005 1 M9999-070105
MIC2287 Micrel, Inc.
MIC2287
1.2MHz PWM White LED Driver with OVP in
2mm × 2mm MLF™ and Thin SOT-23
General Description
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.
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.
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.
The MIC2287 is available in low profile Thin SOT-23 5-lead and
an 8-lead 2mm × 2mm MLF™ package options. The MIC2287
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
10µH
0.22µF
6.3Ω
95mV
1-Cell
Li Ion
1µF
2
3
1
4
5
MIC2287BD5
VIN
EN
SW
FB
GND
CMDSH-3
3-Series White LED Driver in Thin SOT-23
Features
• 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
Applications
• White LED driver for backlighting:
- Cell phones
- PDAs
- GPS systems
- Digital cameras
- MP3 players
- IP phones
• Photo flash LED driver
• LED flashlights
• Constant current power supplies
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
10µH
0.22µF
1µF1-Cell
Li Ion
6.3Ω
MIC2287-34BML
VIN
EN
SW
OVP
FB
GND
95mV
CMDSH-3
6-Series White LED Driver
with Output OVP in 2mm × 2mm MLF™-8
MIC2287 Micrel, Inc.
M9999-070105 2 July 2005
Pin Description
Pin Number Pin Number
TSOT-23-5 2mm
×2mm MLF™ Pin Name Pin Function
1 7 SW Switch node (Input): Internal power BIPOLAR collector.
2 GND Ground (Return): Ground.
3 6 FB 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 3 EN Enable (Input): Logic high enables regulator. Logic low shuts down regula
-
tor.
5 2 VIN Supply (Input): 2.5V to 10V for internal circuitry.
— 1 OVP Overvoltage protection (Input): Connect to the output.
— 4 AGND Analog ground.
— 8 PGND Power ground.
— 5 NC No connect (no internal connection to die).
— EP GND Ground (Return): Exposed backside pad.
Pin Configuration
FB
GND
EN VIN
SW
3
1
5
2
4
TSOT-23-5 (BD5)
OUT
VIN
EN
GND
GND
SW
FB
NC
1
2
3
4
8
7
6
5
EP
8-Pin MLF™ (BML)
(Top View)
Fused Lead Frame
Ordering Information
Marking Overvoltage Junction
Part Number Code Protection Temp. Range Package Lead Finish
MIC2287BD5 SGAA N/A –40°C to 125°C Thin SOT-23-5 Standard
MIC2287YD5 SGAA N/A –40°C to 125°C Thin SOT-23-5 Lead Free
MIC2287-15BML SLA 15V –40°C to 125°C 2mm x 2mm MLF™ Standard
MIC2287-15YML SLA 15V –40°C to 125°C 2mm x 2mm MLF™ Lead Free
MIC2287-24BML SLB 24V –40°C to 125°C 2mm x 2mm MLF™ Standard
MIC2287-24YML SLB 24V –40°C to 125°C 2mm x 2mm MLF™ Lead Free
MIC2287-34BML SLC 34V –40°C to 125°C 2mm x 2mm MLF™ Standard
MIC2287-34YML SLC 34V –40°C to 125°C 2mm x 2mm MLF™ Lead Free
July 2005 3 M9999-070105
MIC2287 Micrel, Inc.
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ..................................................... 12V
Switch Voltage (V
SW
) ......................................–0.3V to 34V
Enable Pin Voltage (V
EN
) ................................... –0.3 to V
IN
FB Voltage (V
FB
) .............................................................6V
Switch Current (I
SW
) ........................................................ 2A
Ambient Storage Temperature (T
S
) .......... –65°C to +150°C
ESD Rating
(3)
............................................................... 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
) ..........................................2.5V to 10V
Junction Temperature Range (T
J
) ............ –40°C to +125°C
Package Thermal Impedance
2mm
× 2mmMLF™ (θ
JA
) ..................................... 93°C/W
Thin SOT-23-5 (
θ
JA
) ......................................... 256°C/W
Electrical Characteristics
(4)
T
A
= 25°C, V
IN
= V
EN
= 3.6V, V
OUT
= 10V, I
OUT
= 10mA, unless otherwise noted. Bold values indicate –40°C ≤ T
J
≤125°C.
Symbol Parameter Condition Min Typ Max Units
V
IN
Supply Voltage Range 2.5 10 V
V
UVLO
Under Voltage Lockout 1.8 2.1 2.4 V
I
VIN
Quiescent Current V
FB
> 200mV, (not switching) 2.5 5 mA
I
SD
Shutdown Current V
EN
= 0V
(5)
0.1 1 µA
V
FB
Feedback Voltage (±5%) 90 95 100 mV
I
FB
Feedback Input Current V
FB
= 95mV –450 nA
Line Regulation
(6)
3V ≤ V
IN
≤ 5V 0.5 1 %
Load Regulation
(6)
5mA ≤ I
OUT
≤ 20mA 0.5 2 %
D
MAX
Maximum Duty Cycle 85 90 %
I
SW
Switch Current Limit 750 mA
V
SW
Switch Saturation Voltage I
SW
= 0.5A 450 mV
I
SW
Switch Leakage Current V
EN
= 0V, V
SW
= 10V 0.01 5 µA
V
EN
Enable Threshold TURN ON 1.5 V
TURN OFF
0.4 V
I
EN
Enable Pin Current V
EN
= 10V 20 40 µA
f
SW
Oscillator Frequency 1.05 1.2 1.35 MHz
V
OVP
Overvoltage Protection MIC2287BML- 15 only 13 14 16 V
MIC2287BML- 24 only 21 22.5 24 V
MIC2287BML- 34 only 30 32 34 V
T
J
Overtemperature 150 °C
Threshold Shutdown Hysteresis 10 °C
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, T
J
(max),
the junction-to-ambient thermal resistance, θ
JA
, and the ambient temperature, T
A
. 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. I
SD
= I
VIN
.
6. Guaranteed by design.
P1-P3P4-P6P7-P9P10-P10

MIC2287-15YML-TR

Mfr. #:
Buy MIC2287-15YML-TR
Manufacturer:
Microchip Technology / Micrel
Description:
LED Lighting Drivers White LED Driver w/ 15V OVP
Lifecycle:
New from this manufacturer.
Delivery:
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