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LMR34206FSC3RNXRQ1

4.2-V to 42-V, 0.6-A ultra-small synchronous step-down converter

Manufacturer: TI
Mfr.Part #: LMR34206FSC3RNXRQ1
Datasheet: LMR34206FSC3RNXRQ1 Datasheet (PDF)
Vin (min) (V): 3.6
Vin (max) (V): 42
Vout (min) (V): 3.3
Vout (max) (V): 40
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LMR34206FSC3RNXRQ1 General Description

The LMR34206-Q1 regulator is an easy-to-use, synchronous, step-down DC/DC converter. With integrated high-side and low-side power MOSFETs, up to of output current is delivered over a wide input voltage range of 4.2 V to 42 V.

The LMR34206-Q1 uses peak-current-mode control to provide optimal efficiency and output voltage accuracy. Precision enable gives flexibility by enabling a direct connection to the wide input voltage or precise control over device start-up and shutdown. The power-good flag, with built-in filtering and delay, offers a true indication of system status eliminating the requirement for an external supervisor.

The LMR34206-Q1 is in a HotRod™ package which enables low EMI, higher efficiency, and the smallest package to die ratio. The device requires few external components and has a pinout designed for simple PCB layout. The small solution size and feature set of the LMR34206-Q1 are designed to simplify implementation for a wide range of end equipment.

Key Features

AEC-Q100-qualified for automotive applications:
- Temperature grade 1: –40°C to +125°C, T_A
Designed for automotive applications
- Junction temperature range –40°C to +150°C
- Protection features: thermal shutdown, input undervoltage lockout, cycle-by-cycle current limit, hiccup short-circuit protection
- 0.2-V dropout with 0.6-A load (typical)
- ±1.5% reference voltage tolerance
- 3.3-V, 5-V fixed-output voltage options
Suited for scalable power supplies
- Pin compatible with:
  - LMR36015/06-Q1 (60 V, 0.6 A or 1.5 A)
  - LMR33620/30-Q1 (36 V, 2 A, or 3 A)
- 2.1-MHz frequency option
Integration reduces solution size and cost
- Small, 2-mm × 3-mm VQFN package with wettable flanks
- Few external components
Low power dissipation across load spectrum
- Increased light load efficiency in PFM
- Low operating quiescent current of 24 µA
Optimized for ultra low EMI requirements
- Meets CISPR25 class 5 standard
- Hotrod™ package minimizes switch node ringing
- Parallel input path minimizes parasitic inductance
- Spread spectrum reduces peak emissions

Specifications

Vin (min) (V)	3.6	Vin (max) (V)	42
Vout (min) (V)	3.3	Vout (max) (V)	40
Iout (max) (A)	0.6	Iq (typ) (mA)	0.025
Switching frequency (min) (kHz)	400	Switching frequency (max) (kHz)	2100
EMI features	Low parasitic Hotrod packaging, Spread Spectrum	Features	Enable, Fixed Output, Light Load Efficiency, Power good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable flanks package
Operating temperature range (°C)	-40 to 125	Rating	Automotive
TI functional safety category	Functional Safety-Capable	Regulated outputs (#)	1
Control mode	current mode	Duty cycle (max) (%)	99
Type	Converter