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PDF ISL8205M Data sheet ( Hoja de datos )
| Número de pieza | ISL8205M | |
| Descripción | 5A Single Channel High Efficiency DC/DC Step-Down Power Module | |
| Fabricantes | Intersil | |
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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 5VIN, 1.2VOUT, 1.6MHz fSW, 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 5VIN
August 15, 2016
FN8755.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL8205M
Pin Descriptions (Continued)
PIN
NUMBER
16
17
18
Exposed
Pad 20
22
PIN
NAME
FS
SS
COMP
PGND
SGND
DESCRIPTION
Frequency selection pin. This pin sets the module switching frequency. The default frequency is 1.8MHz if FS is
connected to VIN. In spite of default setting, a resistor, RFS, can be connected from the FS pin to SGND to adjust
switching frequency ranging from 680kHz to 3.5MHz.
Soft-start pin. SS is used to adjust the soft-start time. Connect to SGND for internal 1ms rise time. Connect a capacitor
from SS to SGND to adjust the soft-start time. The capacitor value should be less than 33nF to ensure proper operation.
Compensation pin. COMP is the output of the voltage feedback error amplifier. For most applications, the internal
compensation network can be used to stabilize the system and achieve optimal transient response. This can be done
by directly connecting COMP to VIN. For other applications where external compensation is desired, COMP needs to be
disconnected from VIN and tied to the external compensation network.
The exposed pad is connected internally to PGND. Solid connection should be made between Pad 20 and PGND plane
on PCB. Place as many vias as possible under the pad connecting to PGND plane(s) for optimal electrical and thermal
performance. Refer to “PCB Layout Recommendations” on page 19 for more information.
Signal ground pin. Connect PCB SGND plane to this pin. Internally, this pin is single-point connected to module PGND.
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
TAPE AND REEL
(UNITS)
PACKAGE
(RoHS COMPLIANT)
PKG.
DWG. #
ISL8205MIRZ-T
ISL8205M
-40 to +85
4k 22 Ld QFN
L22.4.5x7.5
ISL8205MIRZ-T7A
ISL8205M
-40 to +85
250 22 Ld QFN
L22.4.5x7.5
ISL8205MEVAL1Z
Evaluation Board
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil plastic packaged products are RoHS compliant by EU exemption 7C-I and employ special Pb-free material sets, molding compounds/die
attach materials, and 100% matte tin plate plus anneal (e3) termination finish which is compatible with both SnPb and Pb-free soldering operations.
Intersil RoHS compliant products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC
J STD-020.
3. For Moisture Sensitivity Level (MSL), please see product information page for ISL8205M. For more information on MSL, please see Technical Brief
TB363.
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART
NUMBER
MAX OUTPUT CURRENT IOUT
(DC)
ISL8205M
5A
ISL8203M
3A dual, 6A single
ISL8202M
3A
Submit Document Feedback
5
FN8755.3
August 15, 2016
5 Page 
ISL8205M
Typical Performance Characteristics (Continued)
IOUT 2A/DIV
IOUT 2A/DIV
VOUT 50mV/DIV
VOUT 50mV/DIV
100µs/DIV
FIGURE 16. VIN = 5V, VOUT = 2.5V, IOUT = 0 TO 5A, fSW = 2.5MHz,
COUT = 2x22µF CERAMIC CAPACITORS
Start-Up TA = +25°C, Resistor load is used in the test.
100µs/DIV
FIGURE 17. VIN = 5V, VOUT = 3.3V, IOUT = 0 TO 5A, fSW = 3MHz,
COUT = 2x22µF CERAMIC CAPACITORS
SW 5V/DIV
VOUT 500mV/DIV
PGOOD 5V/DIV
IOUT 1A/DIV
500µs/DIV
FIGURE 18. SOFT-START WITH 0A LOAD PWM MODE, VIN = 5V,
VOUT = 1.2V, IOUT = 0A, COUT = 2x22µF CERAMIC
CAPACITORS, CIN = 100µF POSCAP + 2x22µF CERAMIC
CAPACITORS
SW 5V/DIV
VOUT 500mV/DIV
IOUT 2A/DIV
PGOOD 5V/DIV
500µs/DIV
FIGURE 19. SOFT-START WITH 5A LOAD PWM MODE, VIN = 5V,
VOUT = 1.2V, IOUT = 5A, COUT = 2x22µF CERAMIC
CAPACITORS, CIN = 100µF POSCAP + 2x22µF CERAMIC
CAPACITORS
SW 5V/DIV
VOUT 500mV/DIV
PGOOD 5V/DIV
IOUT 2A/DIV
500µs/DIV
FIGURE 20. SOFT-START WITH 0A LOAD PFM MODE, VIN = 5V,
VOUT = 1.2V, IOUT = 0A, COUT = 2x22µF CERAMIC
CAPACITORS, CIN = 100µF POScap + 2x22µF CERAMIC
CAPACITORS
Submit Document Feedback 11
SW 5V/DIV
VOUT 500mV/DIV
IOUT 2A/DIV
PGOOD 5V/DIV
500µs/DIV
FIGURE 21. SOFT-START WITH 5A LOAD PFM MODE, VIN = 5V,
VOUT = 1.2V, IOUT = 5A, COUT = 2x22µF CERAMIC
CAPACITORS, CIN = 100µF POSCAP + 2x22µF CERAMIC
CAPACITORS
FN8755.3
August 15, 2016
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet ISL8205M.PDF ] | |
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