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ISSI IS32LT3953B

CONSTANT-CURRENT 3-AMPERE PWM DIMMABLE BUCK REGULATOR LED DRIVER WITH FAULT PROTECTION

Overview

TopologyBuck Converter
Input voltage4.5-38 V
Output 16.4 V / 3 A
IC revisionB

Description

The IS32LT3953B is a DC-to-DC switching converter that integrates an N-channel MOSFET to operate in a buck configuration. The device can operate from a wide input voltage between 4.5V and 38V and provides a constant current of up to 3A for driving a single LED or multiple series connected LEDs. The external resistor, RISET, is used to set a constant LED output current, while allowing the output voltage to be automatically adjusted for a variety of LED configurations. The IS32LT3953B operates in a fixed frequency mode during switching. There is an external resistor connected between the VCC and TON pins used to configure the on-time (switching frequency). The switching frequency is dithered for spread spectrum operation which will spread the electromagnetic energy into a wider frequency band. This function is helpful for optimizing EMI performance. A logic input PWM signal applied to the enable (EN) pin will adjust the average LED current. The LED brightness is proportional to the duty cycle of the PWM signal. True average output current operation is achieved with fast transient response by using cycle-by-cycle, controlled on-time method. The IS32LT3953B is available in an SOP-8-EP package with an exposed pad for enhanced thermal dissipation. It operates from 4.5V to 38V over the temperature range of -40°C to +125°C.

Features

  • Wide input voltage supply from 4.5V to 38V
    • Withstand 40V load dump
  • True average output current control
  • 3A maximum output over operating temperature range
  • Cycle-by-cycle current limit
  • Integrated high-side MOSFET switch
  • Dimming via analog input, direct logic input or power supply voltage
  • Internal control loop compensation
  • Under-voltage lockout (UVLO) and thermal shutdown protection
  • 2μA low power shutdown
  • Spread spectrum to optimize EMI
  • Internal linear regulator output (VDD) to bias the external circuit
  • Robust fault protection:
    • Pin-to-GND short
    • Component open/short faults
    • Adjacent pin-to-pin short
    • LED open/short
    • Thermal shutdown
  • AEC-Q100 Qualified

Typical applications

  • Automotive and avionic lighting, Daytime running lights, Turn/stop lights, Front and rear fog lights, Matrix headlight, Motorcycle headlight

Products

Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
IRP,40K
(A)
ISAT
(A)
RDC max.
(mΩ)
fres
(MHz)
SizeVersionIR
(A)
Samples
74477110SPEC
8 files WE-PD SMT Power Inductor 10 7.7 5.5 24 21.5 1260 Standard 5
7447709100SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

8 files WE-PD SMT Power Inductor 10 9.5 10.5 21 21 1210 Standard 7.1
744771115SPEC
8 files WE-PD SMT Power Inductor 15 7 4.5 28 16.6 1260 Standard 4.2
7447709150SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

8 files WE-PD SMT Power Inductor 15 7.4 8 26 17 1210 Standard 6.5
744771122SPEC
8 files WE-PD SMT Power Inductor 22 6 3.7 36 13.5 1260 Standard 3.5
7447709220SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

8 files WE-PD SMT Power Inductor 22 7 6.5 28 10 1210 Standard 5.3
744771133SPEC
8 files WE-PD SMT Power Inductor 33 4.6 3 57 11 1260 Standard 2.8
7447709330SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

8 files WE-PD SMT Power Inductor 33 5.5 5.5 45 8.5 1210 Standard 4.2
7447709470SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

8 files WE-PD SMT Power Inductor 47 4.9 4.5 60 6.5 1210 Standard 3.8
744771147SPEC
8 files WE-PD SMT Power Inductor 47 4.1 2.6 77 9.2 1260 Standard 2.4
Order Code Data­sheet Simu­lation
74477110SPEC
7447709100SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

744771115SPEC
7447709150SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

744771122SPEC
7447709220SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

744771133SPEC
7447709330SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

7447709470SPEC

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

744771147SPEC
Samples
Order Code Data­sheet Simu­lation Downloads Product seriesL
(µH)
IRP,40K
(A)
ISAT
(A)
RDC max.
(mΩ)
fres
(MHz)
SizeVersionIR
(A)
Samples