Instrukcja obsługi Microchip MIC2299

Microchip Niesklasyfikowane MIC2299

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MIC2299
3.5A Minimum, 2MHz High Brightness
LED Driver
MLF and MicroLeadFrame are registered 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
October 2007
M9999-101907-B
General Description
The MIC2299 is a high power boost-switching regulator
that is optimized for constant-current control. The MIC2299
is capable of driving up to 2 series 1A white LED for
photoflash and other applications. The feedback voltage is
only 200mV, minimizing power dissipation in constant-
current control applications, and hence extends battery
life.
The MIC2299 has a brightness pin that allows for a
programmable torch mode as well as full flash with a
single pin when driving high current LEDs.
The MIC2299 implements a constant frequency 2MHz
PWM control scheme to make the smallest possible
design. The MIC2299’s 2MHz operation avoids signal
interference in the AM band.
The 2.5V to 10V input voltage range of MIC2299 allows
direct operation from 1- and 2-cell Li-Ion as well as 3- to 4-
cell NiCad/ NiMH/ Alkaline or lithium batteries. Maximum
battery life is assured with a low 1uA shutdown current.
The MIC2299 is available in a low profile 12-pin 3mm x
3mm MLF
®
package.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Programmable current control
• 200mV ±10% feedback voltage
• 2.5V to 10V input voltage
• Output over-voltage protection (OVP)
• Output voltage up to 30V (max)
• Fixed 2MHz Operation
• Guaranteed 3.5A switch current over-temperature
• Solution size of just 0.25in
2
(1.6cm
2
)
• Output power range of 7W to 12W
• <1% line regulation
• 1µA shutdown current
• Over temperature protection
• Externally programmable soft-start
• Under-voltage lockout (UVLO)
• 12-pin 3mm x 3mm leadless MLF
®
package
• –40
°
C to +125
°
C junction temperature range
Applications
• Cell phones
• PDAs
• Digital cameras
• White LED flashlights
___________________________________________________________________________________________________________
Typical Application
Figure 1. High Power White LED Driver
Micrel, Inc. MIC2299
October 2007
2 M9999-101907-B
Ordering Information
Part Number OVP Frequency Junction Temp. Range Package Lead Finish
MIC2299-15YML 15V 2MHz –40° to +125°C 12-Pin 3x3 MLF
®
Pb-Free
Note
MLF® is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
PGND SW
PGND SW
5
1BRT
SS/DIM
FB
AGND
12 COMP
EN
VIN
OVP
11
10
9
2
3
4
8
6 7
EP
12-Pin 3mm x 3mm MLF (ML)
(Top View)
Pin Description
Pin Number Pin Name Pin Function
1 BRT BRT (Input): Short this pin to GND to achieve 20% I
OUT
(1V gives I
OUT
at 100%).
As an alternative connect a resistor to GND to control the I
OUT
to >0.2I
OUT
. . A
10µA current source sets the voltage on the resistor. Hence a 50K resistor
would yield 0.5V which would be 50% of I
OUT
nominal.
2 SS/DIM Soft start/dimming (input) 40kΩ source from V
FB
. Connect a capacitor to GND
for soft-start. Clamp the pin to a known voltage to control the internal reference
voltage and hence the output current. This can also be done with a resistor to
GND
3 FB Feedback (Input): Output voltage sense node. Connect the cathode of the LED
to this pin.
4 AGND Analog Ground
5,6 PGND Power Ground
7,8 SW Switch Node (Input): Internal power BIPOLAR collector.
9 OVP Over-Voltage Protection (OVP): Connect to the output voltage to clamp the
maximum output voltage. A resistor divider from this pin to ground could be
used to raise the OVP level beyond 15V (max).
10 VIN Supply (Input): 2.5V to 10V for internal circuitry.
11 EN Enable (Input): Logic High enables regulator. Logic Low shuts down regulator.
12 COMP Compensation pin (Input): Add external R and C to GND to stabilize the
converter.
Pad EP Ground (Return): Backside exposed pad.
Micrel, Inc. MIC2299
October 2007
3 M9999-101907-B
Absolute Maximum Ratings(1)
Supply Voltage (V
IN
).......................................................12V
Switch Voltage (V
SW
)....................................... –0.3V to 34V
BRT Voltage (V
BRT
) ........................................... –0.3V to 6V
Enable Voltage (V
EN
)....................................... –0.3V to 12V
FB Voltage (V
FB
)...............................................................6V
Switch Current (I
SW
) ..................................Internally Limited
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
BRT Voltage (V
BRT
) ........................................... 0V to 0.6V
IN
Enable Voltage (V
EN
).............................................. 0V to V
IN
Output Voltage (V
OUT
) ................................... V
IN
+ 1 to V
OVP
Junction Temperature (T
J
) ........................–40°C to +125°C
Package Thermal Impedance
3x3 MLF-12 (θ
JA
) ...............................................60°C/W
Electrical Characteristics(4)
T
A
= 25°C; V
IN
= V
EN
= 3.6V; V
OUT
= 7V; I
OUT
= 1A, 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
V
OVP
Over-Voltage Protection 12 13.5 15 V
I
VIN
Quiescent Current V
FB
>200mV, Not Switching 15 23 mA
I
SD
Shutdown Current V
EN
= 0V (Note 5) 0.1 1 µA
V
FB
Feedback Voltage (±8%)
(±10%) (Over Temp)
184
180
200
216
220
mV
mV
I
FB
Feedback Input Current V
FB
= 200mV –450 nA
Line Regulation 2.5V ≤ V
IN
≤ 4.5V 0.5 %
LED Dimming Accuracy
(% of V V
FBNOM
), Note 6
V
BRT
= GND
R
BRT
= 50K
17
45
20
50
23
55
%
%
D
MAX
Maximum Duty Cycle 90 %
I
SW
Switch Current Limit V
IN
= 3V 3.5 4.75 8 A
V
SW
Switch Saturation Voltage V
IN
= 3.6V, I
SW
= 3.5A 350 500 mV
I
SW
Switch Leakage Current V
EN
= 0V, V
SW
= 10V 0.01 10 µA
V
EN
Enable Threshold TURN ON
TURN OFF
1.5
0.4
V
V
I
EN
Enable Pin Current V
EN
= 10V 20 40 µA
f
SW
Oscillator Frequency MIC2299 1.75 2 2.3 MHz
I
SS
Soft start / DIM current DIM = 0V 5 µA
150 °C
T
J
Over-Temperature 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. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. Specification for packaged product only.
5. I
SD
= I
VIN
6. As percentage of full brightness where V
IN
= V
BRT
= 3.6V (100% brightness)

Specyfikacje produktu

Marka: Microchip
Kategoria: Niesklasyfikowane
Model: MIC2299

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