Datasheet > ISL78234ARZ

ISL78234ARZ

更新时间： 2024-11-20 00:59:23

品牌	Logo	应用领域
瑞萨 - RENESAS		/
页数	文件大小	规格书
21页	1480K
描述
3A and 4A Compact Synchronous Buck Regulators

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ISL78234ARZ 数据手册

DATASHEET

ISL78233, ISL78234

3A and 4A Compact Synchronous Buck Regulators

FN8359

Rev 8.00

Apr 19, 2018

The ISL78233, 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.

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

The ISL78233, 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.

• -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

The ISL78233, 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.

• External synchronization up to 4MHz

• Over-temperature, overcurrent, overvoltage, and negative

overcurrent protection

• Shared common device pinout allows simplified output

power upgrades over time

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.

• Tiny 3mmx3mm TQFN package

• AEC-Q100 qualified

Applications

• DC/DC POL modules

The ISL78233, ISL78234 offers a 1ms Power-Good (PG) timer

at power-up. When in shutdown, the ISL78233, ISL78234

discharges the output capacitor through an internal soft-stop

switch. Other features include internal fixed or adjustable

soft-start and internal/external compensation.

• μC/µP, FPGA, and DSP power

• Video processor/SOC power

• Li-ion battery powered devices

• Automotive infotainment power

The ISL78233, ISL78234 is 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, ISL78234 are rated to operate across the

temperature range of -40°C to +125°C.

Related Literature

For a full list of related documents, visit our website

- ISL78233, ISL78234 product page

100

3.3V

OUT

1.5V

OUT

1.2V

OUT

1.8V

OUT

2.5V

OUT

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

OUTPUT LOAD (A)

FIGURE 1. EFFICIENCY vs LOAD (2MHz 5V PFM, T = +25°C)

FN8359 Rev 8.00

Apr 19, 2018

Page 1 of 21

12 3 4 5 6 7...21

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与ISL78234ARZ相关器件

型号	品牌	获取价格	描述	数据表
ISL78234ARZ-T	RENESAS	获取价格	4A Compact Synchronous Buck Regulator; TQFN16, WFQFN16; Temp Range: -40° to 125&am
ISL78234ARZ-T7A	RENESAS	获取价格	4A Compact Synchronous Buck Regulator; TQFN16, WFQFN16; Temp Range: -40° to 125&am
ISL78234EVAL1Z	RENESAS	获取价格	3A and 4A Compact Synchronous Buck Regulators
ISL78234EVAL1Z	INTERSIL	获取价格	3A and 4A Compact Synchronous Buck Regulators
ISL78234EVAL2Z	RENESAS	获取价格	3A and 4A Compact Synchronous Buck Regulators
ISL78235	INTERSIL	获取价格	Automotive 5A Synchronous Buck Regulator
ISL78235	RENESAS	获取价格	5A Automotive Synchronous Buck Regulator
ISL78235AARZ	RENESAS	获取价格	5A Automotive Synchronous Buck Regulator
ISL78235ARZ	RENESAS	获取价格	5A Automotive Synchronous Buck Regulator
ISL78235ARZ	INTERSIL	获取价格	5A Automotive Synchronous Buck Regulator

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