MP3302
The Future of Analog IC Technology
40V, 1.3A, Single-cell Step-up
White LED Driver
with Single Wire Dimming Control
DESCRIPTION
The MP3302 is a step-up converter designed for
driving arrays of WLEDS from a single cell
Lithium Ion battery. The MP3302 uses current
mode, fixed frequency architecture to regulate the
LED current, which is measured through an
external current sense resistor. Its low 200mV
feedback voltage reduces power loss and
improves efficiency. The MP3302 is turned off if
an over-voltage condition is present due to an
open circuit condition.
The MP3302 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload.
The MP3302 is available in small 5-pin TSOT23
and 8-pin QFN (2mm x 3mm) packages.
FEATURES
•
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Internal Power MOSFET
Drives up to 10 Series White LEDs
Up to 87% Efficiency
Single Wire Dimming Control
1.3MHz Fixed Switching Frequency
Open Load Shutdown
Low 200mV Feedback Voltage
UVLO, Thermal Shutdown
Internal 1.3A Current Limit
Available in TSOT23-5 and 2mm x 3mm
QFN8 Packages
5” ~ 7” LCD Panels
Handheld Computers and PDAs
Digital Still Cameras
Small LCD Displays
APPLICATIONS
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“Monolithic Power Systems”, “MPS”, and “The Future of Analog IC Technology”
are Registered Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
String 1 ... String 9
95
Efficiency vs
Input Voltage
3 WLEDs,9 Strings
V
IN
3.3V - 6V
LED1
LED2
LED3
FB
LED25
LED26
LED27
EFFICIENCY (%)
90
85
80
75
70
65
60
3
4
5
6
INPUT VOLTAGE(V)
IN
SW
Enable/
Dimming
Control
EN
MP3302
GND
MP3302 Rev. 0.98
5/5/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL
ORDERING INFORMATION
Part Number
MP3302DJ*
MP3302DD**
Package
TSOT23-5
QFN8 (2mm x 3mm)
Top Marking
N6
N7
Free Air Temperature (T
A
)
–40°C to +85°C
–40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP3302DJ–Z);
For RoHS Compliant Packaging, add suffix –LF (e.g. MP3302DJ–LF–Z).
** For Tape & Reel, add suffix –Z (e.g. MP3302DD–Z);
For RoHS Compliant Packaging, add suffix –LF (e.g. MP3302DD–LF–Z)
PACKAGE REFERENCE
TOP VIEW
TOP VIEW
GND
SW
GND
FB
1
2
3
4
EN
5
IN
1
2
3
4
8
7
6
5
SW
NC
FB
GND
IN
NC
EN
Exposed Pad
Connect to GND
QFN8 (2mm x 3mm)
TSOT23-5
ABSOLUTE MAXIMUM RATINGS
(1)
SW Pin.........................................–0.5V to +44V
All Other Pins ..............................–0.3V to +6.5V
Continuous Power Dissipation…(T
A
= +25°C)
(2)
TSOT23-5 ................................................ 0.57W
QFN8 (2mm x 3mm) ................................ 1.56W
Storage Temperature.............. –55°C to +150°C
Thermal Resistance
(4)
TSOT23-5.............................. 220 .... 110..
°C/W
QFN8 (2mm x 3mm) ............... 80 ...... 16...
°C/W
Notes:
1) Exceeding these ratings may damage the device.
2) 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 continuous power dissipation at
any ambient temperature is calculated by P
D
(MAX) = (T
J
(MAX)-T
A
)/θ
JA
. Exceeding the maximum allowable power
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on approximately 1” square of 1 oz copper.
θ
JA
θ
JC
Recommended Operating Conditions
(3)
IN Supply Voltage ..............................2.5V to 6V
SW Pin ................................................V
IN
to 36V
Operating Junction Temp. (T
J
)..... –40°C to +125°C
MP3302 Rev. 0.98
5/5/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
2
MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL
ELECTRICAL CHARACTERISTICS
V
IN
= V
EN
= 5V, T
A
= +25°C, unless otherwise noted.
Parameters
Operating Input Voltage
Supply Current (Shutdown)
Supply Current (Quiescent)
Switching Frequency
Maximum Duty Cycle
Under Voltage Lockout
IN Under Voltage Lockout
Under Voltage Lockout
Hysteresis
Open Lamp Shutdown
Threshold
Enable
EN OFF Threshold
EN ON Threshold
Minimum EN Dimming
Threshold
Maximum EN Dimming
Threshold
Feedback
FB Voltage
FB Input Bias Current
Output Switch
SW On-Resistance
(5)
SW Current Limit
(5)
Thermal Shutdown
(5)
Notes:
5) Guaranteed by design.
Symbol
V
IN
Condition
V
EN
= 0V
V
FB
= 0.15V
Min
2.5
Typ
4
690
1.3
Max
6
8
850
1.5
Units
V
µA
µA
MHz
%
V
mV
f
SW
V
FB
= 0V
UVLO
V
IN
Rising
1.0
92
2.25
92
2.45
V
OV
V
OV
Rising
V
EN
Falling
V
EN
Rising
V
FB
= 0V
V
FB
= 0.2V
V
EN
= 1.5V
V
FB
= 0.1V
40
0.4
42
44
V
V
V
V
V
mV
nA
Ω
A
°C
0.6
0.655
1.275
185
-600
0.7
1.4
200
-300
0.5
1.33
150
0.845
1.425
215
R
ON
Duty Cycle = 60%
MP3302 Rev. 0.98
5/5/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
3
MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL
PIN FUNCTIONS
TSOT23-5
Pin #
1
QFN8
Pin #
8
Name
SW
Pin Function
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect
the power inductor and output rectifier to SW. SW can swing between GND
and 36V.
2
1, 5
3
6
4
4
5
2
3
GND,
Exposed Ground. Connect exposed pad to GND plane for proper thermal performance.
Pad
Feedback Input. The MP3302 regulates the voltage across the current sense
resistor between FB and GND. Connect a current sense resistor from the
FB
bottom of the LED string to GND. Connect the bottom of the LED string to FB.
The regulation voltage is 200mV.
ON/OFF Control and Dimming Command Input. A voltage greater than 0.6V
will turn the part on and less than 0.4V will turn the part off. If the EN pin
EN
voltage is between 0.7V and 1.4V, V
FB
is regulated between 0V and 200mV.
To use PWM dimming, apply a 200Hz to 1KHz square wave signal with
amplitude greater than 1.5V to this pin.
IN
Input Supply Pin. Must be locally bypassed.
NC
No Connect.
MP3302 Rev. 0.98
5/5/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
4
MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 5V, 3WLEDs 9Strings, unless otherwise noted.
Efficiency vs
Input Voltage
95
90
EFFICIENCY (%)
Steady State Operation
V
IN
= 5V, 3 WLEDs,9 Strings
Enable Startup
V
IN
= 5V, 3 WLEDs,9 Strings
3 WLEDs,9 Strings
V
SW
10V/div.
V
FB
50mV/div.
V
OUT
AC Coupled
100mV/div.
I
inductor
500mA/div.
V
SW
10V/div.
V
EN
2V/div.
V
OUT
5V/div.
85
80
75
70
65
60
3
10WLEDs
8 WLEDs
6 WLEDs
I
LED
100mA/div.
4
5
6
INPUT VOLTAGE(V)
400ns/div.
Enable Shutdown
V
IN
= 5V, 3 WLEDs,9 Strings
V
SW
10V/div.
V
EN
2V/div.
V
OUT
5V/div.
I
LED
100mA/div.
V
SW
20V/div.
V
EN
5V/div.
Start Up into Openload
V
IN
= 5V
V
SW
10V/div.
PWM Dimming
V
IN
= 5V, 3 WLEDs,9 Strings
V
EN
5V/div.
V
OUT
5V/div.
V
OUT
20V/div.
I
LED
100mA/div.
Output Current vs
Analog Dimming Voltage
200
OUTPUT CURRENT (mA)
V
IN
=5V, 3 WLEDs, 9 Strings
Output Current vs
PWM Dimming Duty
V
IN
=5V, 3 WLEDs, 9 Strings
f=1kHz
200
OUTPUT CURRENT (mA)
180
160
140
120
100
80
60
40
20
0
0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6
EN PIN VOLTAGE (V)
180
160
140
120
100
80
60
40
20
0
0
0.2
0.4
0.8
PWM DIMMING DUTY
1
MP3302 Rev. 0.98
5/5/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
5
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