MIC2292/93
High-Frequency PWM White LED Drivers
with Internal Schottky Diode and OVP
General Description
The MIC2292 and MIC2293 are high frequency, Pulse
Width Modulator (PWM) boost regulators optimized for
constant-current, white LED driver applications. Because
of their constant PWM switching frequencies of 1.6MHz
and 2MHz, respectively, the MIC2292/93 can use the
smallest external components, allowing designers to avoid
sensitive IF bands in their RF applications.
The products feature an internal Schottky diode and two
levels of output overvoltage protection allowing a small
size and efficient DC/DC solution that requires only four
external components.
The 2.5V to 10V input voltage range of MIC2292/3 allows
direct operation from 1- and 2-cell Li Ion as well as 3- to 4-
cell NiCad/NiMH/Alkaline batteries. The MIC2292/3
products are available in a small size 2mm × 2mm 8-pin
®
MLF package and have a junction temperature range of
–40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com.
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
2.5V to 10V input voltage
Output voltage up to 34V
Internal Schottky diode
1.6MHz PWM operation (MIC2292)
2.0MHz PWM operation (MIC2293)
Stable with ceramic capacitors
15V and 34V output overvoltage protection options
500mA switch current rating
95mV feedback voltage
<1% line and load regulation
<1µA shutdown current
Over-temperature protection
UVLO
8-pin (2mm × 2mm) MLF
®
package
–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
•
Constant-current power supplies
_________________________________________________________________________________________________________________________
Typical Application
1.6MHz PWM White LED Driver with 15V OVP
MLF and
MicroLead
Frame are registered trademarks of Amkor Technology, Inc.
2MHz PWM White LED Driver with 15V OVP
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
April 2012
M9999-040212-B
Micrel, Inc.
MIC2292/93
Ordering Information
Part Number
MIC2292-15BML
MIC2292-15YML
MIC2292-34BML
MIC2292-34YML
MIC2293-15BML
MIC2293-15YML
MIC2293-34BML
MIC2293-34YML
Marking
Code
SWA
SWA
SWC
SWC
SZA
SZA
SZC
SZC
Overvoltage
Protection
15V
15V
34V
34V
15V
15V
34V
34V
Frequency
1.6MHz
1.6MHz
1.6MHz
1.6MHz
2MHz
2MHz
2MHz
2MHz
Junction Temperature
Range
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
–40° to +125°C
Package
8-Pin MLF
®
8-Pin MLF
®
8-Pin MLF
®
8-Pin MLF
®
8-Pin MLF
®
8-Pin MLF
®
8-Pin MLF
®
8-Pin MLF
®
Lead
Finish
Standard
Pb-Free
Standard
Pb-Free
Standard
Pb-Free
Standard
Pb-Free
Pin Configuration
8-Pin MLF
®
(ML)
(Top View)
Fused Lead Frame
Pin Description
Pin Number
1
2
3
5
6
7
4, 8
EP
Pin Name
OUT
VIN
EN
NC
FB
SW
GND
GND
Pin Function
Output Pin and Overvoltage Protection (Output). Connect to the output capacitor and LEDs.
Supply (Input). Input voltage.
Enable (Input). Logic HIGH enables regulator and logic LOW shuts down regulator.
No Connect. No internal connection to die.
Feedback (Input). Output voltage sense node. Connect the cathode of the LED to this pin. A
resistor from this pin to Ground (GND) sets the LED current.
Switch Node (Input). Internal power transistor collector.
Ground (Return). Ground.
Ground (Return). Exposed backside pad (ePad).
April 2012
2
M9999-040212-B
Micrel, Inc.
MIC2292/93
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .....................................................+12V
Switch Voltage (V
SW
).......................................
−0.3V
to 34V
Enable Pin Voltage (V
EN
)...................................
−0.3V
to V
IN
FB Voltage (V
FB
)...............................................................6V
Switch Current (I
SW
) .........................................................2A
Ambient Storage Temperature (T
S
)...........−65°C to +150°C
Schottky Reverse Voltage (V
DA
).....................................34V
ESD Rating
(3)
.................................................................. 2kV
Operating Ratings
(2)
Supply Voltage (V
IN
).................................... +2.5V to +10V
Output Voltage (V
OUT
) ....................................... V
IN
to V
OVP
Junction Temperature Range (T
J
)........... –40°C to +125°C
Package Thermal Impedance
8-Pin MLF
®
(θ
JA
) .............................................. 93°C/W
Electrical Characteristics
(4)
T
A
= +25°C, V
IN
= V
EN
= 3.6V, V
OUT
= 15V, I
OUT
= 20mA, unless otherwise indicated.
Bold
values indicate –40°C≤ T
J
≤
+125°C.
Symbol
V
IN
V
UVLO
I
VIN
I
SD
V
FB
I
FB
Parameter
Supply Voltage Range
Undervoltage Lockout
Quiescent Current
Shutdown Current
Feedback Voltage
Feedback Input Current
Line Regulation
(6)
Load Regulation
(6)
D
MAX
I
SW
V
SW
I
SW
V
EN
I
EN
f
SW
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.
The device is not guaranteed to operate beyond its specified operating ratings.
Devices are inherently ESD sensitive. Handling precautions required. Human body model, 1.5kΩ in series with 100pF.
Specification for packaged product only.
I
SD
= I
VIN
.
Guaranteed by design.
Condition
Min.
2.5
1.8
Typ.
2.1
2.5
0.1
Max.
10
2.4
5
1
100
1
2
Units
V
V
mA
µA
mV
nA
%
%
mA
mV
V
FB
>
200mV (not switching)
V
EN
= 0V
(±5%)
V
FB
= 95mV
3V
≤
V
IN
≤
5V
5mA
≤
I
OUT
≤
20mA
85
I
SW
= 0.5A
V
EN
= 0V, V
SW
= 10V
Turn-On
Turn-Off
V
EN
= 10V
MIC2292
MIC2293
1.4
1.75
1.5
(5)
90
95
-450
0.5
0.5
90
750
450
0.01
Maximum Duty Cycle
Switch Current Limit
Switch Saturation Voltage
Switch Leakage Current
Enable Threshold
Enable Pin Current
Oscillator Frequency
5
0.4
µA
V
µA
MHz
20
1.6
2.0
40
1.8
2.25
2.
3.
4.
5.
6.
April 2012
3
M9999-040212-B
Micrel, Inc.
MIC2292/93
Electrical Characteristics
(4)
(Continued)
T
A
= +25°C, V
IN
= V
EN
= 3.6V, V
OUT
= 15V, I
OUT
=20mA, unless otherwise indicated. Bold values indicate –40°C≤ T
A
≤
+125°C.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
V
D
I
RD
V
OVP
Schottky Forward Drop
Schottky Leakage Current
Overvoltage Protection
I
D
= 150mA
V
R
= 30V
MIC2292/93-15
MIC2292/93-34
V
IN
= 2.5V, V
EN
ramped 0V to V
IN
t
ON
Turn-On Time
V
IN
= 5V, V
EN
ramped 0V to V
IN
V
IN
= 10V, V
EN
ramped 0V to V
IN
T
J
Overtemperature Shutdown
Threshold
Hysteresis
150
10
13
30
14
32
0.8
1
4
16
34
50
50
50
°C
µs
V
µA
V
April 2012
4
M9999-040212-B
Micrel, Inc.
MIC2292/93
Typical Characteristics
April 2012
5
M9999-040212-B
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