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ISL78234AARZ-T7A +BOM

Buck Switching Regulator IC Positive Adjustable 0.6V 1 Output 4A 16-VQFN Exposed Pad

Manufacturer:

Renesas Technology Corp
Mfr.Part #:

ISL78234AARZ-T7A
Datasheet:

ISL78234AARZ-T7A Datasheet (PDF)
Pkg. Name:

L16.5X5D
Pkg. Previous Code:

LDN
Pkg. Code:

LDN
Lead Count:

16
EDA/CAD Models:

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ISL78234AARZ-T7A General Description

The ISL78233 and ISL78234 are highly efficient, monolithic, synchronous step-down DC/DC converters that can deliver 3A (ISL78233), or 4A (ISL78234) of continuous output current from a 2. 7V to 5. 5V input supply. The devices use current mode control architecture to deliver a very low duty cycle operation at high frequency with fast transient response and excellent loop stability. The ISL78233 and ISL78234 integrate a very low ON‑resistance P‑channel (35mΩ) high-side FET and N-channel (11mΩ) low‑side FET to maximize efficiency and minimize external component count. The 100% duty-cycle operation allows less than 200mV dropout voltage at 4A output current. The operation frequency of the Pulse-Width Modulator (PWM) is adjustable from 500kHz to 4MHz. The default switching frequency of 2MHz is set by connecting the FS pin high. The ISL78233 and ISL78234 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference, while discontinuous mode provides higher efficiency by reducing switching losses at light loads. Fault protection is provided by internal Hiccup mode current limiting during short-circuit and overcurrent conditions. Other protection, such as overvoltage and over-temperature are also integrated into the device. A power-good output voltage monitor indicates when the output is in regulation. The ISL78233 and ISL78234 offer a 1ms Power-Good (PG) timer at power-up. When in shutdown, the ISL78233 and ISL78234 discharge the output capacitor through an internal soft-stop switch. Other features include internal fixed or adjustable soft‑start and internal/external compensation. The ISL78233 and ISL78234 are available in a 3mmx3mm 16 Ld Thin Quad Flat (TQFN) Pb-free package and in a 5mmx5mm 16 Ld Wettable Flank Quad Flat No-Lead (WFQFN) package with an exposed pad for improved thermal performance. The ISL78233 and ISL78234 are rated to operate across the temperature range of -40°C to +125°C.

Key Features

2.7V to 5.5V input voltage range
Very low ON-resistance FETs - P-channel 35mΩ and N‑channel 11mΩ typical values
High efficiency synchronous buck regulator with up to 95% efficiency
-1.2%/1% reference accuracy over temperature/load/line
Complete BOM with as few as 3 external parts
Internal soft-start - 1ms or adjustable
Soft-stop output discharge during disable
Adjustable frequency from 500kHz to 4MHz - default at 2MHz
External synchronization up to 4MHz
Over-temperature, overcurrent, overvoltage, and negative overcurrent protection
Shared common device pinout allows simplified output power upgrades over time
Tiny 3mmx3mm TQFN package
AEC-Q100 qualified

Application

DC/DC POL modules
μC/μP, FPGA and DSP power
Video processor/SOC power
Li-ion battery powered devices
Automotive infotainment power

Specifications

Pkg. Name:	L16.5X5D	Pkg. Previous Code:	LDN
Pkg. Code:	LDN	Lead Count:	16
Length:	5 mm	Width:	5 mm
Thickness:	0.85 mm	Pb (Lead) Free:	Yes
Carrier Type:	Reel	Pkg. Type:	WFQFN
Moisture Sensitivity Level (MSL):	1	Pb Free Category:	Nickel/Palladium/Gold-Silver - e4