Datasheet LED driver IC series for Automotive lamps LED Driver with Built-in PWM Signal Generation Circuit BD18351EFV-M General Description Key Specifications BD18351EFV-M is an LED driver with built-in 1ch boost Input Voltage Range: 4.5 V to 65 V controller. It is an optimal IC for LED drive for head lamp / Output Voltage Range: 6.0 V to 65 V DRL, tail lamp and turn lamp capable of realizing boost Absolute Maximum Input / Output Voltage: 70 V and buck boost with high-side detection of LED current Minimum PWM Dimming Pulse Width: 50 s setting against output voltage. Further, cost saving and downsizing of the set can be realized, since it contains CRTIMER which enables PWM dimming without microcomputer for applications requiring PWM dimming of DRL, etc. Features (Note 1) AEC-Q100 Qualified Package W(Typ) D(Typ) H(Max) Built-in Switching DC / DC Controller. HTSSOP-B24 7.80 mm 7.60 mm 1.00 mm LED Current Setting High Side Detection Method LED Current Precision: 3.0% (40 C to 125 C) PWM Signal Generation Circuit with Built-in CRTIMER (External PWM Dimming Control is possible.) Built-in Spread Spectrum Function Built-in LED Open Detection Function Built-in LED Anode to Ground Short Function (Note 1) Grade1 Applications Head lamp, DRL, front position lamp, tail lamp, turn lamp HTSSOP-B24 Typical Application Circuit External power VOUT VB FAIL VREG50 VCC ODT EN VREG25 RT DCD VOUT DRL SWDRV RS BD18351EFV-M CS COMP VREG50 VREG SS IMP IMN DISC CR PWMOUT TDISC GND DGND Figure 1. Typical Application Circuit Product structure: Silicon integrated circuit This product has no designed protection against radioactive rays www.rohm.com TSZ02201-0T3T0C700130-1-2 2016 ROHM Co., Ltd. All rights reserved. 1/45 02.Sep.2019 Rev.004 TSZ22111 14 001 BD18351EFV-M Pin Configuration HTSSOP-B24 (TOP VIEW) COMP 1 24 VCC 2 23 EN SS GND 3 22 DRL DCD 4 21 N.C VREG25 5 20 VREG50 RT 6 19 ODT RS 7 18 SWDRV CR 8 17 CS DISC 9 16 DGND FAIL 10 15 N.C Thermal PAD TDISC 11 14 IMP PWMOUT 12 13 IMN Figure 2. Pin Configuration Pin Description Terminal Terminal Symbol Function Symbol Function No. No. Error amplifier output phase 1 COMP 13 IMN LED current detection terminal (-) compensation terminal 2 SS Soft start setting terminal 14 IMP LED current detection terminal (+) 3 GND Small signal GND 15 N.C. - 4 DCD DC dimming terminal 16 DGND Power GND 2.5V standard voltage 5 VREG25 17 CS Over current detection setting terminal (DCD Exclusive terminal) DC / DC oscillation frequency 6 RT 18 SWDRV External FET gate drive terminal setting terminal Spread spectrum frequency 7 RS 19 ODT LED open detection setting terminal setting terminal Built-in CRTIMER Internal constant voltage 5.0 V 8 CR PWM dimming frequency / 20 VREG50 output terminal Duty setting terminal Built-in CRTIMER 9 DISC 21 N.C. - Discharge setting terminal Terminal for DRL control switching 10 FAIL Error flag output terminal 22 DRL (High: 100 % mode) 11 TDISC 23 EN Discharge time setting terminal EN control terminal (High: Active) External for PWM dimming 12 PWMOUT 24 VCC Power voltage terminal FET gate drive terminal (Pay attention that it does not correspond to reverse insertion.) www.rohm.com TSZ02201-0T3T0C700130-1-2 2016 ROHM Co., Ltd. All rights reserved. 2/45 02.Sep.2019 Rev.004 TSZ22111 15 001