ISL8202M Datasheet, PDF (1/25 Pages) Intersil Corporation – 3A Single Channel High Efficiency DC/DC Step-Down Power Module

DATASHEET
3A Single Channel High Efficiency DC/DC Step-Down
Power Module
ISL8202M
The ISL8202M power module is a single channel synchronous
step-down complete power supply, capable of delivering up to
3A of continuous current. Operating from a single 2.6V to 5.5V
input power rail and integrating controller, power inductor and
MOSFETs, the ISL8202M 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 ISL8202M
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
ISL8202M 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 ISL8202M 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”
• UG071, “ISL8202MEVAL1Z Evaluation Board User Guide”
Features
• 3A single channel complete power supply
- Integrates controller, MOSFETs and inductor
- Pin compatible with the 5A ISL8205M
• 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
ISL8202M
VIN
EN
PG
VOUT
SW
VSENSE
100
1.2V 3A OUTPUT
95
90
COUT
2x22µF
85
SYNC
COMP
80
FS
FB
75
RFS
133k
SS
SGND
EPAD
PGND
RSET
100k
CFF
560pF
70
65
Vout=3.3V, Fsw=2MHz PWM
Vout=3.3V, Fsw=2MHz PFM
Vout=1.2V, Fsw=1.5MHz PFM
Vout=1.2V, Fsw=1.5MHz PWM
60
0
0.5
1
1.5
2
2.5
3
LOAD CURRENT (A)
FIGURE 1. TYPICAL APPLICATION DIAGRAM AT 5_VIN, 1.2V_OUT, 1.5MHz f_SW, 3A
FIGURE 2. EFFICIENCY vs LOAD 5V_IN
August 16, 2016
1
FN8761.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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