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부품번호 ISL8205M 기능
기능 5A Single Channel High Efficiency DC/DC Step-Down Power Module
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ISL8205M 데이터시트, 핀배열, 회로
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.




ISL8205M pdf, 반도체, 판매, 대치품
Pin Configuration
PGND SYNC PG
VIN
14 13 12
11
EN 15
FS 16
SS 17
COMP 18
20
PGND
21
SW
FB 19
22 SGND
NC
10
12
FB VSENSE
3 45
PGND
VSENSE NC
ISL8205M
ISL8205M
(22 LD QFN)
TOP VIEW
SW
9
8 NC
7 NC
6
VOUT
7.5mm
1.85mm
Pin Descriptions
PIN
NUMBER
1, 19
2, 4
3, 14
5, 7, 8, 10
6
9, 21
11
12
13
15
PIN
NAME
FB
VSENSE
PGND
NC
VOUT
SW
VIN
PG
SYNC
EN
DESCRIPTION
Voltage setting pin. Module output voltage is set by connecting a resistor, RSET, from this pin to SGND. A ceramic
capacitor is also recommended to be placed in parallel with RSET from FB to SGND to ensure system stability in extreme
operation conditions. Refer to Table 2 on page 14 for the resistor and capacitor values for various typical output voltage.
Voltage sense pin. Pins 2 and 4 are shorted together internally. An internal 51Ω resistor is connected from VOUT (Pad 6)
to VSENSE for local output voltage feedback in case remote sensing is not present. To achieve best regulation
performance at point of load, remote sensing trace needs to be directly routed to VSENSE.
Power ground. Power ground pins. Place output capacitor across VOUT and PGND close to Pin 3 since it is the return
path for output current.
No connection pins. These pins have no connections inside. Leave these pins floating.
Power output. Power output of the module. Output capacitors should be placed across this pad and Pin 3 PGND and
close to the module. Apply load between this pin and PGND Pin 3. Output voltage range: 0.6V to 5V.
Switching node. These pins can be used to monitor switch node waveform to examine switching frequency. These pins
can also be used for snubber connection. To improve system efficiency, it is recommended to connect Pins 9 and 21
with wide copper shape. However, avoid connecting SW to large copper shape to minimize radiated EMI noise.
Power input. Input voltage range: 2.6V to 5.5V. Tie directly to the input rail. It is required to have a minimum total input
capacitance of 44µF at module input. Add additional capacitance if possible. Use X5R or X7R ceramic capacitors. It is
critical to place input ceramic capacitors as close as possible to module input. Refer to “PCB Layout
Recommendations” on page 19 for more information.
Power-good pin. Power-good is an open-drain output. Use a 10kΩ to 100kΩ pull-up resistor connected between VIN and
PG. During power-up or EN pin start-up, PG rising edge is delayed by 1ms upon output reached within regulation.
Synchronization pin. Mode selection pin. Connect to logic high or input voltage VIN for PWM mode. Connect to logic low
or ground for PFM mode. Connect to an external clock for synchronization with the positive edge trigger. There is an
internal 1MΩ pull-down resistor to prevent an undefined logic state in case SYNC pin is floating. Therefore, PFM mode
is enabled when SYNC is left floating.
Power enable pin. Enables the output, when driven high. Shuts down the output and discharges the output capacitor
when driven low. Typically tie to VIN pin directly. Do not leave this pin floating.
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ISL8205M 전자부품, 판매, 대치품
ISL8205M
Electrical Specifications Unless otherwise noted, typical specifications are measured at VIN = 3.6V, VOUT = 1.2V, TA = +25°C.
Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 6) TYP (Note 6)
UNIT
VFB Bias Current (Note 7)
Soft-Start Ramp Time Cycle (Note 7)
IFB VFB = 0.75V
SS = GND
0.1 µA
1 ms
Soft-Start Charging Current (Note 7)
DYNAMIC CHARACTERISTICS
ISS VSS = 0.1V
1.45 1.85 2.25
µA
Voltage Change for Positive Load Step
ΔVOUT-DP Current slew rate = 1A/µs, VIN = 5V, 2x22µF
ceramic output capacitor
Voltage Change for Negative Load Step
ΔVOUT-DP
VOUT = 1.2V, IOUT = 0A to 5A, fSW = 1.6MHz
VOUT = 3.3V, IOUT = 0A to 5A, fSW = 3MHz
Current slew rate = 1A/µs, VIN = 5V, 2x22µF
ceramic output capacitor
120
69
mVP-P
mVP-P
OVERCURRENT PROTECTION (Note 7)
VOUT = 1.2V, IOUT = 5A to 0A, fSW = 1.6MHz
VOUT = 3.3V, IOUT = 5A to 0A, fSW = 3MHz
127
79
mVP-P
mVP-P
Current Limit Blanking Time
Overcurrent and Auto Restart Period
Positive Peak Overcurrent Limit
Positive Skip Limit
Zero Cross Threshold
tOCON
tOCOFF
IPLIMIT
ISKIP
17 Clock pulses
8 SS cycle
7.5 9.0 11.0
A
1.0 1.3 1.8
A
-300
300 mA
Negative Current Limit
COMPENSATION (Note 7)
INLIMIT
-4.5 -3.0 -1.5
A
Current Sensing Gain
Error Amplifier Transconductance
Rt
Internal compensation
0.119 0.140 0.166
60
Ω
µA/V
External compensation
120 µA/V
SWITCH NODE (Note 7)
P-Channel MOSFET ON-Resistance
N-Channel MOSFET ON-Resistance
SW Maximum Duty Cycle
VIN = 5V, IO = 200mA
VIN = 2.7V, IO = 200mA
VIN = 5V, IO = 200mA
VIN = 2.7V, IO = 200mA
36 63
52 89
13 30
17 36
100
mΩ
mΩ
mΩ
mΩ
%
SW Minimum On-Time
SYNC = High
115 ns
OSCILLATOR
Nominal Switching Frequency
SYNC Logic LOW to HIGH Transition Range
fSW SYNC = VIN
fSW with RFS = 261kΩ
fSW with RFS = 124kΩ
1600
0.70
1835
800
1600
0.75
2070
0.80
kHz
kHz
kHz
V
SYNC Hysteresis
0.15
V
SYNC Logic Input Leakage Current
VIN = 3.6V
3.6 5.0
µA
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부품번호상세설명 및 기능제조사
ISL8205M

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

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