ISL8205M Datasheet, PDF (1/25 Pages) Intersil Corporation – 5A Single Channel High Efficiency DC/DC Step-Down Power Module

DATASHEET
5A Single Channel High Efficiency DC/DC Step-Down
Power Module
ISL8205M
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.
Related Literature
• TB389, “PCB Land Pattern Design and Surface Mount
Guidelines for QFN Packages”
• UG072, “ISL8205MEVAL1Z Evaluation Board User Guide”
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
Applications
• DC to DC POL power module
• µC/µP, FPGA and DSP power
• Portable equipment
• Battery operated equipment
2.6V TO 5.5V
INPUT
CIN
2x22µF
RFS
124k
ISL8205M
VIN
EN
PG
SYNC
FS
SS
SGND
EPAD
VOUT
SW
VSENSE
COMP
FB
PGND
1.2V 5A
OUTPUT
COUT
2x22µF
RSET
100k
CFF
820pF
FIGURE 1. TYPICAL APPLICATION DIAGRAM AT 5_VIN, 1.2V_OUT, 1.6MHz f_SW, 5A
100.0
95.0
90.0
85.0
80.0
75.0
Vout=1.2V, Fsw=1.6MHz PWM
70.0
Vout=1.2V, Fsw=1.6MHz PFM
65.0
Vout=3.3V, Fsw=3MHz PFM
Vout=3.3V, Fsw=3MHz PWM
60.0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
LOAD CURRENT (A)
FIGURE 2. EFFICIENCY vs LOAD 5V_IN
August 15, 2016
1
FN8755.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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