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ISL8002A Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer ISL8002A
Beschreibung Compact Synchronous Buck Regulators
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 24 Seiten
ISL8002A Datasheet, Funktion
Compact Synchronous Buck Regulators
ISL8002, ISL8002A, ISL80019, ISL80019A
ISL8002, ISL8002A, ISL80019 and ISL80019A are highly
efficient, monolithic, synchronous step-down DC/DC converters
that can deliver up to 2A of continuous output current from a 2.7V
to 5.5V input supply. They use peak current mode control
architecture to allow very low duty cycle operation. They operate
at either 1MHz or 2MHz switching frequency, thereby providing
superior transient response and allowing for the use of small
inductors. They also have excellent stability and provide both
internal and external compensation options.
ISL8002, ISL8002A, ISL80019 and ISL80019A integrate very low
rDS(ON) MOSFETs in order to maximize efficiency. In addition,
since the high side MOSFET is a PMOS, the need for a Boot
capacitor is eliminated, thereby reducing external component
count. They can operate at 100% duty cycle (at 1MHz) with a
dropout of 200mV at 2A output current.
These devices can be configured for either PFM (discontinuous
conduction) or PWM (continuous conduction) operation at light
load. PFM provides high efficiency by reducing switching losses at
light loads and PWM reduces noise susceptibility and RF
interference.
These devices are offered in a space saving 8 pin 2mmx2mm
TDFN lead free package with exposed pad for improved thermal
performance. The complete converter occupies less than
0.10in2 area.
Features
• VIN range 2.7V to 5.5V
• VOUT range is 0.6V to VIN
• IOUT maximum is 1.5A or 2A (see Table 1 on page 3)
• Switching frequency is 1MHz or 2MHz (see Table 1 on
page 3)
• Internal or external compensation option
• Selectable PFM or PWM operation option
• Overcurrent and short circuit protection
• Over-temperature/thermal protection
• VIN Undervoltage Lockout and VOUT Overvoltage Protection
• Up to 95% peak efficiency
Applications
• General purpose point of load DC/DC
• Set-top boxes and cable modems
• FPGA power
• DVD, HDD drives, LCD panels, TV
Related Literature
• See AN1803, “1.5A/2A Low Quiescent Current High
Efficiency Synchronous Buck Regulator”
VIN
GND
+2.7V …+5.5V 1 VIN
C1
22μF
2 EN
EN 3 MODE
PG 4 PG
ISL8002
PAD
9
L1
PHASE 8 1.2μH
C5
22μF
PGND 7
+1.8V/2A
C6
22μF
R1
FB 6 +0.6V 200kΩ 1%
COMP 5
R2
100kΩ 1%
VOUT
GND
R1
=
R2
---V----O----
VFB
1⎠⎞
FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION
(INTERNAL COMPENSATION OPTION)
(EQ. 1)
100
90
80
70
2.5VOUT
60
1.8VOUT
1.5VOUT
50
1.2VOUT
0.9VOUT
0.8VOUT
400.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD
FSW = 1MHz, VIN = 3.3V, MODE = PFM, TA = +25°C
July 30, 2013
FN7888.2
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 2013. 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.






ISL8002A Datasheet, Funktion
ISL8002, ISL8002A, ISL80019, ISL80019A
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
TAPE AND REEL
QUANTITY
PART
MARKING
TECHNICAL
SPECIFICATIONS
TEMP. RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL8002IRZ-T
1000
002
2A, 1MHz
-40 to +85
8 Ld TDFN
L8.2x2C
ISL8002IRZ-T7A
250
002
2A, 1MHz
-40 to +85
8 Ld TDFN
L8.2x2C
ISL8002AIRZ-T
1000
02A
2A, 2MHz
-40 to +85
8 Ld TDFN
L8.2x2C
ISL8002AIRZ-T7A
250
02A
2A, 2MHz
-40 to +85
8 Ld TDFN
L8.2x2C
ISL80019IRZ-T
1000
019
1.5A, 1MHz
-40 to +85
8 Ld TDFN
L8.2x2C
ISL80019IRZ-T7A
250
019
1.5A, 1MHz
-40 to +85
8 Ld TDFN
L8.2x2C
ISL80019AIRZ-T
1000
19A
1.5A, 2MHz
-40 to +85
8 Ld TDFN
L8.2x2C
ISL80019AIRZ-T7A
250
19A
1.5A, 2MHz
-40 to +85
8 Ld TDFN
L8.2x2C
ISL8002FRZ-T
1000
02F
2A, 1MHz
-40 to +125 8 Ld TDFN
L8.2x2C
ISL8002FRZ-T7A
250
02F
2A, 1MHz
-40 to +125 8 Ld TDFN
L8.2x2C
ISL8002AFRZ-T
1000
2AF
2A, 2MHz
-40 to +125 8 Ld TDFN
L8.2x2C
ISL8002AFRZ-T7A
250
2AF
2A, 2MHz
-40 to +125 8 Ld TDFN
L8.2x2C
ISL80019FRZ-T
1000
19F
1.5A, 1MHz
-40 to +125 8 Ld TDFN
L8.2x2C
ISL80019FRZ-T7A
250
19F
1.5A, 1MHz
-40 to +125 8 Ld TDFN
L8.2x2C
ISL80019AFRZ-T
1000
9AF
1.5A, 2MHz
-40 to +125 8 Ld TDFN
L8.2x2C
ISL80019AFRZ-T7A
250
9AF
1.5A, 2MHz
-40 to +125 8 Ld TDFN
L8.2x2C
NOTES:
1. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free 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 device information page for ISL8002, ISL8002A, ISL80019, ISL80019A. For more information on
MSL please see techbrief TB363.
6 FN7888.2
July 30, 2013

6 Page









ISL8002A pdf, datenblatt
ISL8002, ISL8002A, ISL80019, ISL80019A
Typical Performance Curves (Continued)
LX 5V/DIV
VOUT 1V/DIV
VEN 1V/DIV
LX 5V/DIV
VOUT 1V/DIV
VEN 2V/DIV
PG 5V/DIV
1ms/DIV
FIGURE 21. START-UP AT NO LOAD
FSW = 2MHz, VIN = 5V, MODE = PFM, TA = +25°C
PG 5V/DIV
1ms/DIV
FIGURE 22. START-UP AT NO LOAD
FSW = 2MHz, VIN = 5V, MODE = PWM, TA = +25°C
LX 5V/DIV
VOUT 1V/DIV
LX 5V/DIV
VOUT 1V/DIV
VEN 2V/DIV
PG 5V/DIV
1ms/DIV
FIGURE 23. SHUTDOWN AT NO LOAD
FSW = 2MHz, VIN = 5V, MODE = PFM, TA = +25°C
LX 5V/DIV
VOUT 1V/DIV
VEN 2V/DIV
VEN 2V/DIV
PG 5V/DIV
1ms/DIV
FIGURE 24. SHUTDOWN AT NO LOAD
FSW = 2MHz, VIN = 5V, MODE = PWM, TA = +25°C
LX 5V/DIV
VOUT 1V/DIV
PG 5V/DIV
1ms/DIV
FIGURE 25. START-UP AT 2A LOAD
FSW = 2MHz, VIN = 5V, MODE = PWM, TA = +25°C
12
VEN 2V/DIV
PG 5V/DIV
1ms/DIV
FIGURE 26. SHUTDOWN AT 2A LOAD
FSW = 2MHz, VIN = 5V, MODE = PWM, TA = +25°C
FN7888.2
July 30, 2013

12 Page





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