ISL85003

Highly Efficient 3A Synchronous Buck Regulator

Product Status: Mass Production

OVERVIEW

The ISL85003 and ISL85003A are synchronous buck regulators with integrated high-side and low-side FETs. The regulator can operate from an input voltage range of 4.5V to 18V while delivering a very efficient continuous 3A current. This is all delivered in a very compact 3mmx4mm DFN package.

The ISL85003 is designed on Intersil’s proprietary fab process that is designed to deliver very low rDS(ON) FETs with an optimized current mode controller wrapped around it. The high-side NFET is designed to have an rDS(ON) of 65mΩ while the low-side NFET is designed to have an rDS(ON) of 45mΩ. With these two FETs, the device delivers very high efficiency power to the load.

The ISL85003 can automatically switch between DCM and CCM for light-load efficiency in DCM. The switching frequency in CCM is internally set to 500kHz.

The device provides a maximum static regulation tolerance of ±1% over wide line, load and temperature ranges. The output is user adjustable, with external resistors, down to 0.8V. Pulling EN above 0.6V enables the controller. The regulator supports prebiased output.

Fault protection is provided by internal current limiting during positive or negative overcurrent conditions, output and input under and overvoltage detection and an over-temperature monitoring circuit.

KEY FEATURES

    • Input voltage range 4.5V to 18V
    • Output voltage adjustable from 0.8V, ±1%
    • Efficiency up to 95%
    • Integrated boot diode with undervoltage detection
    • Current mode control
    • DCM/CCM
      - Internal or external compensation options
      - 500kHz switching frequency option
      - External synchronization up to 2MHz on ISL85003
    • Adjustable soft-start time on the ISL85003A
    • Open-drain PG window comparator
      - Built-in protection
      - Positive and negative overcurrent protection
      - Overvoltage and thermal protection
      - Input overvoltage protection
    • Small 12 Ld 3mmx4mm Dual Flat No-Lead (DFN) package

PARAMETRICS

Parameters
ISL85003
Basic Information
生产状态
Mass Production
iSim模型
YES
拓扑
Buck
输出数量
1
输入电压最小值 (V)
4.5
输入电压最大值 (V)
18
输出电压最小值 (V)
0.8
输出电压最大值 (V)
15
输出电流最大值 (A)
3
IQ
3.2 mA
开关频率 (最大值) (MHz)
0.6
开关频率 (最小值) (MHz)
0.4
最大占空比 (%)
See Datasheet
资质级别
Standard
峰值效率 (%)
95
POR
Yes
SYNCH功能
Yes
控制类型
Current Mode
开关频率范围 (MHz)
0.5
CAN 采样
YES
温度范围
-40 to +125

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