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MP3386DR-LF-Z

P1-P3P4-P6P7-P9P10-P12P13-P14
MP3386- 50V, 6 STRINGS WHITE LED DRIVERS
MP3386 Rev. 1.0 www.MonolithicPower.com 4
1/19/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS (continued)
V
IN
=12V, V
EN
= 5V, T
A
= +25°C, unless otherwise noted.
Parameters Symbol Condition Min Typ Max Units
LED CURRENT REGULATION
LEDX Average Current I
LED
R
ISET
=60.4k 19.3 20 20.7 mA
Current Matching I
LED
=20mA 3 %
Maximum LED Current per String I
LEDmax
R
ISET
=40.2 k 30 mA
LEDX Regulation Voltage
(5)
V
LEDX
I
LED
=20mA 600 mV
PROTECTION
OVP Over Voltage Threshold V
OVP_OV
Rising Edge 1.17 1.23 1.3 V
OVP UVLO threshold V
OVP_UV
Step-up Converter Fails 48 70 102 mV
LEDX Over Voltage Threshold V
LEDX_OV
V
IN
>5.5V 5.1 5.5 5.9 V
LEDX UVLO Threshold V
LEDX_UV
130 175 230 mV
Thermal Shutdown Threshold T
ST
150
℃
LEDX Over Voltage Fault Timer 1.3 1.6 1.9 ms
VFAULT Pull Down Current I
FAULT
40 55 70 µA
VFAULT Blocking-Off Voltage
(with Respect to V
IN
)
V
FAULT
V
IN
=12V, V
IN
-V
FAULT
6 V
Notes:
5) Matching is defined as the difference of the maximum to minimum current divided by the sum of the maximum and minimum currents.
MP3386- 50V, 6 STRINGS WHITE LED DRIVERS
MP3386 Rev. 1.0 www.MonolithicPower.com 5
1/19/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
PIN FUNCTIONS
QFN24
Pin #
SOIC28
Pin #
Name Description
1 5 EN Enable Control Input. Do not let this pin floating.
2 6 OSC
Switching Frequency Selection Input. When float this pin or connect this pin to
VCC, the step-up converter switching frequency is 1.25MHz. When connect this
pin to GND, the step-up converter switching frequency is 625kHz.
3 7 FSET
Dimming PWM Frequency Set. Connect a capacitor between FSET and GND to
set the DPWM frequency by the equation: f
DPWM
=3.5uF/C
FSET
. The frequency of
DPWM is recommended to be set from 100Hz to 2kHz.
4 8 PWMO
PWM Filter Output. To use external PWM dimming mode, connect a capacitor
between PWMO and GND to form a low-pass filter with an internal 400k
resistor. It filters the external PWM logic signal on PWMI pin into a DC signal
whose level is inversely proportional to the duty-cycle of the input PWM signal
and then the DC signal is translated into a duty-cycle of the dimming PWM. To
use DC input PWM dimming mode, directly apply a DC voltage from 0.2V to
1.2V on PWMO pin for dimming PWM duty cycle control. The DC input PWM
dimming polarity is negative.
5 9 GND Analog Ground.
6 10 PWMI
PWM Signal Input. To use external PWM dimming mode, apply a PWM signal
on this pin for brightness control. This signal is filtered and its duty cycle is
converted into a DC signal to calculate the DPWM duty cycle. And the DPWM
duty cycle equals to the input PWM duty cycle. To use DC input PWM dimming
mode, float this pin.
7 11 LED6
LED String 6 Current Input. This pin is the open-drain output of an internal
dimming control switch. Connect the LED String 6 cathode to this pin. If this
string is not used, connect Vout to this pin.
8 12 LED5
LED String 5 Current Input. This pin is the open-drain output of an internal
dimming control switch. Connect the LED String 5 cathode to this pin. If this
string is not used, connect Vout to this pin.
9 13 LED4
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. If this
string is not used, connect Vout to this pin.
10 14 LED3
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. If this
string is not used, connect Vout to this pin.
11 16 ISET
LED Current Set. Tie a current setting resistor from this pin to ground to
program the current in each LED string. I
LED
= 1.21V / R
SET
12 18 LED2
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. If this
string is not used, connect Vout to this pin.
13 19 LED1
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. If this
string is not used, connect Vout to this pin.
14
15, 17,
20, 25,
27
NC No Connection.
15 21 Vout Voltage Output. Connect this pin to output.
MP3386- 50V, 6 STRINGS WHITE LED DRIVERS
MP3386 Rev. 1.0 www.MonolithicPower.com 6
1/19/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
PIN FUNCTIONS (continued)
QFN24
Pin #
SOIC28
Pin #
Name
Description
16 22 OVP
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
MP3386 triggers OV Protection mode.
17 23 PGND2 Step-up Converter Power Ground.
18 24 PGND1
Step-up Converter Power Ground. PGND1 and PGND2 should be shorted
externally.
19 28 SW1
Step-up Converter Power Switch Output. SW1 is the drain of the internal
MOSFET switch. Connect the power inductor and output rectifier to SW1.
SW1 can swing between GND and 50V. SW1 and SW2 should be shorted
externally.
20 26 SW2
Step-up Converter Power Switch Output. SW2 is the drain of the internal
MOSFET switch. Connect the power inductor and output rectifier to SW2.
SW2 can swing between GND and 50V. SW1 and SW2 should be shorted
externally.
21 1 VFAULT
Fault Disconnection Switch Driver Output. When the system starts up
normally, this pin turns on the external PMOS. When the MP3386 is disabled,
the external PMOS is turned off to disconnect the input and output.
22 2 COMP
Step-up Converter Compensation Pin. This pin is used to compensate the
regulation control loop. Connect a capacitor or a series RC network from
COMP to GND.
23 3 VIN
Supply Input.
VIN supplies the power to the chip, as well as the step-up
converter switch. Drive VIN with a 4.5V to 25V power source. Must be locally
bypassed.
24 4 VCC
The Internal 5V Linear Regulator Output. VCC provides power supply for the
internal MOSFET switch gate driver and the internal control circuitry. Bypass
VCC to GND with a ceramic capacitor. If VIN is less than 5.5V, apply an
external 5V supply directly on VCC.
P1-P3P4-P6P7-P9P10-P12P13-P14

MP3386DR-LF-Z

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