MP3394
The Future of Analog IC Technology
Step-up, 4-String
Max 200mA/String White LED Driver
DESCRIPTION
The MP3394 is a step-up controller with 4-
channel current sources designed for driving
the WLED arrays for large size LCD panel
backlighting applications.
The MP3394 is
flexible for extending LED channels with two or
more MP3394s in parallel while operating from
a single inductor power source.
The MP3394 uses current mode, fixed
frequency architecture. The switching frequency
is programmable by an external frequency
setting resistor. It drives an external MOSFET
to boost up the output voltage from a 5V to 28V
input supply. The MP3394 regulates the current
in each LED string to the programmed value set
by an external current setting resistor.
The MP3394 applies 4 internal current sources
for current balance and the current matching
can achieve 2.5% regulation accuracy between
strings. Its low 350mV regulation voltage on
LED current sources reduces power loss and
improves efficiency.
PWM dimming is implemented with external
PWM input signal or DC input signal. The
dimming PWM signal can be generated
internally and the dimming frequency is
programmed by an external setting capacitor.
FEATURES
•
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•
•
•
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•
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4-String, Max 200mA/String WLED Driver
5V to 28V Input Voltage Range
2.5% Current Matching Accuracy Between
Strings
Programmable Switching Frequency
PWM or DC Input Burst PWM Dimming
Open and Short LED Protection
Programmable Over-Voltage Protection
Cascading Capability with a Single Power
Source
Under Voltage Lockout
Thermal Shutdown
TSSOP16EP，SOIC16, SOIC20 Package
Desktop LCD Flat Panel Displays
Flat Panel Video Displays
LCD TVs and Monitors
APPLICATIONS
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
L1
D1
C
OUT
VIN
5V~28V
C
IN
R1
15
VIN
GATE
14
M1
R2
C
VCC
C
COMP
R
COMP
16
VCC
13
1
COMP
ISENSE
Enable
R
OSC
2
R
SENSE
EN
5
OSC
MP3394
GND
4
OVP
7
12
BOSC
LED1
11
R
BOSC
C
BOSC
LED2
10
DIMMING
R
SET
3
DBRT
LED3
9
6
ISET
LED4
8
MP3394 Rev. 1.07
3/21/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
MP3394—4-STRING, MAX 200mA/STRING WHITE LED DRIVER
ORDERING INFORMATION
Part Number
MP3394EF*
MP3394ES**
MP3394EY***
Package
TSSOP16EP
SOIC16
SOIC20
Top Marking
MP3394
MP3394
MP3394
*For
Tape & Reel, add suffix –Z (e.g. MP3394EF–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP3394EF–LF–Z)
**For
Tape & Reel, add suffix –Z (e.g. MP3394ES–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP3394ES–LF–Z)
***For
Tape & Reel, add suffix –Z (e.g. MP3394EY–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP3394EY–LF–Z)
PACKAGE REFERENCE
TOP VIEW
COMP
EN
DBRT
NC
GND
NC
OSC
ISET
BOSC
LED4
1
20
VCC
VIN
2
19
3
18
GATE
ISENSE
NC
NC
OVP
LED1
LED2
LED3
4
17
5
16
6
15
7
14
8
13
9
12
10
11
TSSOP16EP
SOIC16
(1)
SOIC20
(4)
ABSOLUTE MAXIMUM RATINGS
Thermal Resistance
θ
JA
θ
JC
V
IN
.................................................-0.3V to +30V
V
GATE
..............................................-0.5V to 6.8V
V
CC
.................................................-0.5V to 6.8V
V
LED1
to V
LED4
....................................-1V to +55V
All Other Pins ...............................-0.3V to +6.3V
(2)
Continuous Power Dissipation (T
A
= +25°C)
TSSOP16EP………………………………...2.78 W
SOIC16 ……………………………………1.56 W
SOIC20 …………………………………… 1.74W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
TSSOP16EP ...........................45 ...... 10 ...
°C/W
SOIC16 ...................................80 ...... 35 ...
°C/W
SOIC20 ...................................72 ...... 30 ...
°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
operation conditions.
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions
(3)
Supply Voltage V
IN
..............................5V to 28V
LED Current (Backlight) ...........10mA to 180mA
Operating Junction Temp. (T
J
). -20°C to +125°C
MP3394 Rev. 1.07
3/21/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
2
MP3394—4-STRING, MAX 200mA/STRING WHITE LED DRIVER
ELECTRICAL CHARACTERISTICS
V
IN
=12V, V
EN
= 5V, T
A
= +25°C, unless otherwise noted.
Parameters
Operating Input Voltage
Supply Current (Quiescent)
Supply Current (Shutdown)
LDO Output Voltage
Input UVLO Threshold
Input UVLO Hysteresis
EN High Voltage
EN Low Voltage
STEP-UP CONVERTER
Gate
Driver
Impedance
(Sourcing)
Gate
Driver
Impedance
(Sinking)
Switching Frequency
OSC Voltage
Minimum On Time
Maximum Duty Cycle
ISENSE Limit
COMP Source Current Limit
COMP Sink Current Limit
PWM DIMMING
DBRT Leakage Current
BOSC Frequency
BOSC Output Current
LED CURRENT REGULATION
ISET Voltage
LEDX Average Current
Current Matching
(5)
V
ISET
I
LED
R
ISET
=30kΩ
I
LED
=32mA
1.20
31
1.23
32
1.25
33
2.5
V
mA
%
I
DBRT_LK
F
BOSC
I
BOSC
C
BOSC
=2.2nF
-5
1.0
6
1.5
7.5
5
2
9
μA
kHz
μA
I
COMP SOLI
I
COMP SILI
f
SW
V
OSC
T
ON_MIN
D
MAX
Max Duty Cycle
PWM Mode,
when no pulse skipping happens
90
150
200
65
15
250
V
EN_HIGH
V
EN_LOW
V
EN
Rising
V
EN
Falling
V
CC
=6V,V
GATE
=6V
V
CC
=6V,I
GATE
=10mA
R
OSC
= 115kΩ
R
OSC
= 374kΩ
480
145
1.20
4
2
540
165
1.23
100
600
185
1.26
1.8
0.6
Symbol
V
IN
I
Q
I
ST
V
CC
V
IN_UVLO
V
IN
=12V, V
EN
=5V, no load with
switching
V
EN
=0V, V
IN
=12V
V
EN
=5V,
0<I
VCC
<10mA
Rising Edge
7V<V
IN
<28V,
5.5
3.8
6
4.2
200
Condition
Min
5
4
2
6.5
4.6
Typ
Max
28
Units
V
mA
μA
V
V
mV
V
V
Ω
Ω
kHz
kHz
V
ns
%
mV
μA
μA
MP3394 Rev. 1.07
3/21/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
3
MP3394—4-STRING, MAX 200mA/STRING WHITE LED DRIVER
ELECTRICAL CHARACTERISTICS
(continued)
V
IN
=12V, V
EN
= 5V, T
A
= +25°C, unless otherwise noted.
Parameters
LEDX Regulation Voltage
PROTECTION
OVP(Over Voltage Protection)
Threshold
OVP UVLO threshold
LEDX UVLO Threshold
LEDX Over Voltage Threshold
Thermal Shutdown Threshold
Symbol
V
LEDX
V
OVP_OV
V
OVP_UV
V
LEDX_UV
V
LEDX_OV
T
ST
Condition
I
LED
=32mA
Rising Edge
Step-up Converter Fails
1.20
50
156
5.8
Min
Typ
350
Max
Units
mV
1.23
70
196
6.3
150
1.26
90
236
6.8
V
mV
mV
V
℃
Notes:
5) Matching is defined as the difference of the maximum to minimum current divided by 2 times average currents.
MP3394 Rev. 1.07
3/21/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
4
MP3394—4-STRING, MAX 200mA/STRING WHITE LED DRIVER
PIN FUNCTIONS
TSSOP16EP
SOIC20
&SOIC16
1
2
1
2
Name
COMP
EN
Description
Step-up Converter Compensation Pin. This pin is used to compensate the
regulation control loop. Connect a ceramic capacitor from COMP to GND.
Enable Control Input. Do not let this pin float.
Brightness Control Input. To use external PWM dimming mode, apply a
PWM signal on this pin for brightness control. To use DC input PWM
dimming mode, apply a DC voltage range from 0.2V to 1.2V on this pin
linearly to set the internal dimming duty cycle from 0% to 100%. The MP3394
has positive dimming polarity on DBRT.
Ground.
3
3
DBRT
4
5
5
7
GND
6
8
7
9
Switching Frequency Set. Connect a resistor between OSC and GND to set
the step-up converter switching frequency. The voltage at this pin is
OSC
regulated to 1.23V. The clock frequency is proportional to the current
sourced from this pin.
LED Current Set. Tie a current setting resistor from this pin to ground to
program the current in each LED string. This pin voltage is regulated to
ISET
1.23V. The LED current is proportional to the current through the ISET
resistor.
Dimming Repetition Set. This is the timing pin for the oscillator to set the
dimming frequency. To use DC input PWM dimming mode, connect a
capacitor from this pin to GND to set the internal dimming frequency. A saw-
BOSC
tooth waveform is generated on this pin. To use external PWM dimming
mode, connect a resistor from this pin to GND, and apply the PWM signal on
DBRT pin.
LED4
LED3
LED2
LED1
OVP
LED String 4 Current Input. This pin is the open-drain output of an internal
dimming control switch. Connect the LED String 4 cathode to this pin.
LED String 3 Current Input. This pin is the open-drain output of an internal
dimming control switch. Connect the LED String 3 cathode to this pin.
LED String 2 Current Input. This pin is the open-drain output of an internal
dimming control switch. Connect the LED String 2 cathode to this pin.
LED String 1 Current Input. This pin is the open-drain output of an internal
dimming control switch. Connect the LED String 1 cathode to this pin.
Over-voltage Protection Input. Connect a resistor divider from output to this
pin to program the OVP threshold. When this pin voltage reaches 1.23V, the
MP3394 triggers Over Voltage Protection mode.
8
9
10
11
12
10
11
12
13
14
MP3394 Rev. 1.07
3/21/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
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