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MP3388SGR-Z

P1-P3P4-P6P7-P9P10-P12P13-P15
MP3388S—55V, 8-STRING, STEP-UP, WHITE LED DRIVER
MP3388S Rev.1.02 www.MonolithicPower.com 4
9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 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 19.4 20 20.6 mA
Current Matching
(5)
I
LED
=20mA 2.5 %
Maximum LED Current per
String
I
LEDmax
30 mA
ISET Regulation Voltage 1.18 1.22 1.26 V
LEDx Regulation Voltage V
LEDX
I
LED
=20mA 500 600 700 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
150 200 250 mV
Thermal Shutdown Threshold
(6)
T
ST
130 150
℃
LEDx Over-Voltage Fault Timer Vosc=high 1.3 1.6 1.9 ms
VFAULT Pull-Down Current I
FAULT
40 55 70 A
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 2 times average currents.
6) Guarantee by design.
MP3388S—55V, 8-STRING, STEP-UP, WHITE LED DRIVER
MP3388S Rev.1.02 www.MonolithicPower.com 5
9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin # Name Description
1 EN Enable Control Input. Do not let this pin floating.
2 OSC
Switching-Frequency Selection. When left floating or connected to VCC, the step-up
converter switching frequency is 1.25MHz. When connected to GND, the step-up converter
switching frequency is 625kHz.
3 FPWM
Dimming PWM Frequency Setting. Connect a capacitor, C
FPWM
, between FPWM and GND to
set the DPWM frequency using the equation: f
DPWM
=3.5F/C
FPWM
.
4 PWMO
PWM Filter Output. For external PWM dimming, connect a capacitor between PWMO and
GND. For DC-input PWM dimming, directly apply a DC voltage between 0.2V and 1.2V. The
DC-input PWM dimming polarity is negative.
5 GND Analog Ground.
6 PWMI
PWM Signal Input. For external PWM dimming mode, apply a PWM signal. For DC-input
PWM dimming mode, leave floating.
7 LED8
LED String 8 Current Input. This pin is the open-drain output of an internal dimming-control
switch. Connect the LED String 8 cathode to this pin.
8 LED7
LED String 7 Current Input. This pin is the open-drain output of an internal dimming-control
switch. Connect the LED String 7 cathode to this pin.
9 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.
10 LED5
LED String 5 Current Input. This pin is the open-drain output of an internal dimming-control
switch. Connect the LED String 8 cathode to this pin.
11 ISET
LED Current Setting. Tie a current setting resistor from this pin to ground to program the
current in each LED string. I
LED
= 1000 x 1.21V / R
SET
12 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.
13 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.
14 LED2
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.
15 LED1
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.
MP3388S—55V, 8-STRING, STEP-UP, WHITE LED DRIVER
MP3388S Rev.1.02 www.MonolithicPower.com 6
9/28/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
PIN FUNCTIONS (continued)
Pin # Name Description
16 OVP
Over-Voltage Protection Input. Connect to the tap of a resistor divider from the output to
AGND to program the OVP threshold. When this pin voltage reaches 1.23V, the MP3388S
triggers OVP mode.
17 PGND2 Step-Up Converter Power Ground. PGND1 and PGND2 should be shorted externally.
18 PGND1 Step-Up Converter Power Ground. PGND1 and PGND2 should be shorted externally.
19 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
55V. SW1 and SW2 should be shorted externally.
20 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
55V. SW1 and SW2 should be shorted externally.
21 VFAULT
Fault-Disconnection–Switch Driver Output. When the system starts up normally, this pin
turns on the external PMOS. When the MP3388S is disabled, the external PMOS turns off
to disconnect the input and output.
22 COMP
Step-Up Converter Compensation. This pin compensates the regulation control loop.
Connect a capacitor or a series RC network from COMP to GND.
23 VIN
Supply Input. VIN supplies the power to the MP3388S chip. Drive VIN with a 4.3V-to-25V
power source. Must be locally bypassed.
24 VCC
The Internal 5V Linear Regulator Output. VCC provides power for the internal MOSFET
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-P15

MP3388SGR-Z

Mfr. #:
Buy MP3388SGR-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
LED Lighting Drivers 50V, 8-String White LED Drvr
Lifecycle:
New from this manufacturer.
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