ISL8205M

5A Single Channel High Efficiency DC/DC Step-Down Power Module

OVERVIEW

The ISL8205M power module is a single channel synchronous step-down complete power supply, capable of delivering up to 5A of continuous current. Operating from a single 2.6V to 5.5V input power rail and integrating controller, power inductor and MOSFETs, the ISL8205M only requires a few external components to operate and is optimized for space constrained and portable battery operated applications.

Based on current mode PWM control scheme, the ISL8205M provides a fast transient response and excellent loop stability as well as a very low duty cycle with an adjustable output voltage as low as 0.6V and better than 1.6% accuracy over line and load conditions. Operation frequency is selectable through an external resistor, with a 1.8MHz default setting, or may be synchronized with an external clock signal up to 3.5MHz. The ISL8205M also implements a selectable PFM mode to improve light-load efficiency and a 100% duty cycle LDO mode to extend battery life. A programmable soft-start reduces the inrush current required from the input supply while an automatic output discharge ensures a soft stop. Dedicated enable pin and power-good flag allow for easy system power rails sequencing.

An array of protection features, including input Undervoltage Lockout (UVLO), over-temperature, overcurrent/short-circuit with hiccup mode, overvoltage and negative overcurrent, guarantees safe operations under abnormal operating conditions.

The ISL8205M is available in a compact RoHS compliant 22 Ld 4.5x7.5x1.85mm QFN package.

KEY FEATURES

  • 5A single channel complete power supply
  • Integrates controller, MOSFETs and inductor
  • Pin/function compatible with the 3A ISL8202M
  • 2.6V to 5.5V input voltage range
  • Adjustable output voltage range
  • As low as 0.6V with ±1.6% accuracy over line/load/temperature
  • Up to 95% efficiency
  • Default 1.8MHz current mode control operations
  • 680kHz to 3.5MHz resistor adjustable
  • External synchronization up to 3.5MHz
  • Selectable light-load efficiency mode
  • 100% duty cycle LDO mode
  • Programmable soft-start
  • Soft-stop output discharge
  • Dedicated enable pin and power-good flag
  • UVLO, over-temperature, overcurrent, overvoltage and negative overcurrent protections
  • Overcurrent/short-circuit hiccup mode
  • 4.5mmx7.5mmx1.85mm 22 Ld QFN package

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL8205M
Basic Information
Production Status
Mass Production
iSim Model
YES
Input Voltage Min (V)
2.6
Input Voltage Max (V)
5.5
Output Voltage Min (V)
0.6
Output Voltage Max (V)
5
Output Current Max (A)
5
IQ
18 mA
Peak Efficiency (%)
95
POR
Yes
Switching Freq. (max) (MHz)
3.5
Switching Freq. (min) (MHz)
0.68
Control Type
Current Mode
SYNCH Capability
Yes
Current Sharing
No
Tracking
No
Digital
No
Qualification Level
Standard
PVin_max (V)
5.5
PVin_min (V)
2.6
Switching Frequency Range (MHz)
0.680 to 3.5
Can Sample
YES
Temperature Range
-40 to +85

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