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PDF ISL85003A Data sheet ( Hoja de datos )
| Número de pieza | ISL85003A | |
| Descripción | Highly Efficient 3A Synchronous Buck Regulator | |
| Fabricantes | Intersil | |
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DATASHEET
ISL85003, ISL85003A
Highly Efficient 3A Synchronous Buck Regulator
The ISL85003 and ISL85003A are synchronous buck regulators
with integrated high-side and low-side FETs. The regulator can
operate from an input voltage range of 4.5V to 18V while
delivering a very efficient continuous 3A current. This is all
delivered in a very compact 3mmx4mm DFN package.
The ISL85003 is designed on Intersil’s proprietary fab process
that is designed to deliver very low rDS(ON) FETs with an
optimized current mode controller wrapped around it. The
high-side NFET is designed to have an rDS(ON) of 65mΩ while
the low-side NFET is designed to have an rDS(ON) of 45mΩ.
With these two FETs, the device delivers very high efficiency
power to the load.
The ISL85003 can automatically switch between DCM and
CCM for light-load efficiency in DCM. The switching frequency
in CCM is internally set to 500kHz.
The device provides a maximum static regulation tolerance of
±1% over wide line, load and temperature ranges. The output
is user adjustable, with external resistors, down to 0.8V. Pulling
EN above 0.6V enables the controller. The regulator supports
prebiased output.
Fault protection is provided by internal current limiting during
positive or negative overcurrent conditions, output and input
under and overvoltage detection and an over-temperature
monitoring circuit.
Related Literature
• AN1935, “ISL85003DEMO1Z, ISL85003ADEMO1Z
Evaluation Board User Guide”
• AN1930, “ISL85003EVAL2Z, ISL85003AEVAL2Z Evaluation
Board User Guide”
• AN1965, “Effectively Using the Intersil Small Form Factor
Power Management Evaluation Boards”
FN7968
Rev.2.00
Jan 15, 2016
Features
• Input voltage range 4.5V to 18V
• Output voltage adjustable from 0.8V, ±1%
• Efficiency up to 95%
• Integrated boot diode with undervoltage detection
• Current mode control
- DCM/CCM
- Internal or external compensation options
- 500kHz switching frequency option
- External synchronization up to 2MHz on ISL85003
• Adjustable soft-start time on the ISL85003A
• Open-drain PG window comparator
- Built-in protection
- Positive and negative overcurrent protection
- Overvoltage and thermal protection
- Input overvoltage protection
• Small 12 Ld 3mmx4mm Dual Flat No-Lead (DFN) package
Applications
• Network and communication equipment
• Industrial process control
• Multifunction printers
• Point-of-load regulators
• Standard 12V rail supplies
• Embedded computing
tSS = 2ms, FIXED
U1 ISL85003
SYNC
L
=
0.5V
L=
H=
DE
1.20V POS
H = FPWM
EDGE
1
SYNC
PG
2
OPEN DRAIN, ADD PULL-UP
PG
EN
3
THRESHOLD 1V, HYST 100mV
EN
AGND
4.C7p1 F
+0.8V ±8mV 4 FB
R1
301k
1%
R2
57.1k
1%
5
COMP
6 AGND
BOOT 12 C3 0.1µF
11 C4 1µF
VDD
+5V
VIN 10
VIN 9
C5
10µF
4.5 TO 18V
C6
10µF
VIN
GND
PHASE 8
PHASE 7
L1
fSW = 500kHz 4.7µH
DEVICE MUST BE
CONNECTED TO GND
PLANE WITH 8 VIAs.
C8
47µF
+5V
MAX 3A
VOUT
C9,22µF
GND
OPTIONAL CAP
NO CAP: tSS = 2ms
For tSS>2ms, ADD CAP:
U1 ISL85003A
C[nF] = 4.1 * tSS[ms]-1.6nF
2C2n2F
SS
1 SYNC
BOOT 12 C3 0.1µF
PG
2
OPEN DRAIN, ADD PULL-UP
PG
EN 3 EN
THRESHOLD 1V, HYST 100mV
AGND
+0.8V ±8mV 4 FB
4.C7p1F
R1
301k
1%
R2
57.1k
1%
5
COMP
6 AGND
11 C4 1µF
VDD
+5V
VIN 10
C5
VIN 9
10µF
4.5 TO 18V
C6
10µF
VIN
GND
PHASE 8
PHASE 7
L1
fSW = 500kHz 4.7µH
C8
47µF
+5V
MAX 3A
VOUT
C9,22µF
GND
DEVICE MUST BE
CONNECTED TO GND
PLANE WITH 8 VIAs.
+5V
FIGURE 1A. ISL85003 VIN RANGE FROM 4.5V TO 18V, VOUT = 5V AND
INTERNAL COMPENSATION WITH EXTERNAL
FREQUENCY SYNC
FIGURE 1B. ISL85003A VIN RANGE FROM 4.5V TO 18V, VOUT = 5V
AND INTERNAL COMPENSATION WITH EXTERNAL
SOFT-START
FIGURE 1. TYPICAL APPLICATION SCHEMATICS
FN7968 Rev.2.00
Jan 15, 2016
Page 1 of 23
1 page  
ISL85003, ISL85003A
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP RANGE
(°C)
OPTION
FREQUENCY
PACKAGE
(kHz)
(RoHS Compliant)
PKG.
DWG. #
ISL85003FRZ
003F
-40 to +125
SYNC
500 12 Ld DFN
L12.3x4
ISL85003AFRZ
003A
-40 to +125
Soft-Start
500 12 Ld DFN
L12.3x4
ISL85003EVAL2Z
Evaluation Board
ISL85003AEVAL2Z
Evaluation Board
ISL85003DEMO1Z
Demo Evaluation Board
ISL85003ADEMO1Z
Demo Evaluation Board
NOTES:
1. Add “-T” suffix for 6k unit, “-TK” suffix for 1k unit or “-T7A” suffix for 250 unit Tape and Reel options. 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 product information page for ISL85003, ISL85003A. For more information on MSL, please see tech
brief TB363.
4. The ISL85003 is provided with a frequency synchronization input. The ISL85003A is a version of the part with programmable soft-start.
TABLE 1. COMPONENTS SELECTION (Refer to Figures 1A and 1B)
VOUT
0.8V 1V 1.2V 1.5V 1.8V 2.5V 3.3V 5V
C5, C6
10µF
10µF
10µF
10µF
10µF
10µF
10µF
10µF
C8
22µF
22µF
22µF
47µF
47µF
47µF
47µF
47µF
C9
22µF
22µF
22µF
22µF
22µF
22µF
22µF
22µF
C1
Open
Open
Open
4.7pF
4.7pF
4.7pF
4.7pF
4.7pF
L1
1.8µH
2.2µH
2.2µH
3.3µH
3.3µH
3.3µH
4.7µH
4.7µH
R1
301kΩ
301kΩ
301kΩ
301kΩ
301kΩ
301kΩ
301kΩ
301kΩ
R2
Open
1.2MΩ
604kΩ
344kΩ
241kΩ
142kΩ
96.3kΩ
57.1kΩ
NOTE: VIN = 12V, IOUT = 3A; The components selection table is a suggestion for typical application using internal compensation mode. For application
that required high output capacitance greater than 200µF, R1 should be adjusted to maintain loop response bandwidth about 40kHz. See “Loop
Compensation Design” on page 19 for more detail.
PART NUMBER
ISL85003
ISL85003A
TABLE 2. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
INTERNAL/EXTERNAL
COMPENSATION
EXTERNAL FREQUENCY
SYNC
PROGRAMMABLE
SOFT-START
Yes Yes No
Yes No Yes
SWITCHING FREQUENCY
300kHz to 2MHz
500kHz
FN7968 Rev.2.00
Jan 15, 2016
Page 5 of 23
5 Page 
ISL85003, ISL85003A
Typical Performance Curves Circuit of VIN = 12V, VOUT = 5V, IOUT = 3A, TJ = -40°C to +125°C unless otherwise noted.
Typical values are at TA = +25°C. (Continued)
PHASE 10V/DIV
VOUT 5V/DIV
VEN 10V/DIV
PG 5V/DIV
50ms/DIV
FIGURE 21. SHUTDOWN VEN AT 3A LOAD
VIN 10V/DIV
VOUT 5V/DIV
IL 2A/DIV
PG 5V/DIV
1ms/DIV
FIGURE 22. START-UP VIN AT NO LOAD (CCM)
VIN 10V/DIV
VOUT 5V/DIV
IL 2A/DIV
PG 5V/DIV
100ms/DIV
FIGURE 23. SHUTDOWN VIN AT NO LOAD (CCM)
VIN 10V/DIV
VOUT 5V/DIV
IL 2A/DIV
PG 5V/DIV
1ms/DIV
FIGURE 24. START-UP VIN AT NO LOAD (DCM)
VIN 10V/DIV
VOUT 5V/DIV
IL 2A/DIV
PG 5V/DIV
100ms/DIV
FIGURE 25. SHUTDOWN VIN AT NO LOAD (DCM)
FN7968 Rev.2.00
Jan 15, 2016
VIN 10V/DIV
VOUT 5V/DIV
IL 2A/DIV
PG 5V/DIV
1ms/DIV
FIGURE 26. STAR-TUP VIN AT 3A LOAD
Page 11 of 23
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ISL85003A.PDF ] | |
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