ISL78234

4A Compact Synchronous Buck Regulator

OVERVIEW

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.

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.

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.

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, 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.

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.

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"

PARAMETRICS

Parameters
ISL78234
Basic Information
Production Status
量産中
トポロジ
Buck
出力数
1
入力電圧 (V) (min)
2.7
入力電圧 (V) (max)
5.5
出力電圧 (V) (min)
0.6
出力電圧 (V) (max)
5.5
出力電流 (A) (max)
4
IQ
45 µA
スイッチング周波数 (max) (MHz)
4
スイッチング周波数 (min) (MHz)
0.5
最大デューティサイクル (%)
100
認定レベル
Automotive
ピーク効率 (%)
95
POR
Yes
BOM総フットプリント (mm2)
141.9
SYNCH機能
Yes
制御タイプ
Current Mode
スイッチング周波数範囲 (MHz)
0.5 to 4
CANサンプル
YES
温度範囲
-40 to +125

上記downloadには必ず下のボタンより契約内容を御確認ください。

MyRenesasボタンよりID,PWをご入力ください。