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PDF ISL8560 Data sheet ( Hoja de datos )
| Número de pieza | ISL8560 | |
| Descripción | DC/DC Power Switching Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
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®
Data Sheet
September 19, 2008
ISL8560
FN9244.7
DC/DC Power Switching Regulator
The ISL8560 is a step down DC/DC power switching
regulator which accepts 9.0V to 60V input and provides a 2A
output current. The output voltage can be set in the range
between 1.21V and 55V by means of an external divider.
The device uses an internal power DMOS transistor with a
typical rDS(ON) of 0.19Ω to obtain very high efficiency and
high switching speed. A switching frequency in the range of
100kHz to 600kHz can be realized (the maximum power
dissipation of the various packages must be observed).
Notable features of this next generation of DC/DC converter
includes pulse-by-pulse current limit for FET protection,
hiccup mode for short circuit protection, voltage feedforward
regulation, Frequency SYNC, soft-start, low standby current
of 60µA typical in the disabled state, and thermal shut-down.
The device is available in a 20 Ld QFN package.
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL8560IRZ ISL 8560IRZ -40 to +85 20 Ld 6x6 QFN L20.6x6B
ISL8560IRZ-T* ISL 8560IRZ -40 to +85 20 Ld 6x6 QFN L20.6x6B
*Please refer to TB347 for details on reel specifications.
NOTE: 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.
Features
• Voltage feedforward mode
• Step down DC/DC supporting up to 2A
• Input voltage range of 9.0V to 60V
• Internal reference of 1.21V ±1%
• Adjustable output voltage range of 1.21V to 55V
• Adjustable switching frequency 100kHz to 600kHz
• Frequency SYNC pin
• Zero load current operation
• Pulse-by-pulse mode current limit and Hiccup mode
• Low standby current of 60µA typical
• Thermal shut-down
• Load dump to 100V for 400ms
• Pb-Free (RoHS compliant)
Applications
• Industrial and automotive power supplies
• Portable computers
• Battery chargers
• Distributed power systems
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Pinout
ISL8560
(20 LD QFN)
TOP VIEW
20 19 18 17 16
LX 1
LX 2
BOOT 3
EN 4
VCC5 5
15 LX
14 SS
13 PGND
12 PGOOD
11 REF
6 7 8 9 10
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL8560
REF
SS
SOFT-
START
COMP
EN BANDGAP
1.21V
FB
1.6k
3pF
EAMP
+14% +
+
-14%
RTCT
SYNC
VCC5
RAMP
GEN
OSC
LDO
+
PWM
COMP
OVFLT
PWM
LOGIC
CONTROLLER
PROTECTION
DRIVER
UVFLT
OCFLT
+
CSA
3µs
DELAY
BOOT
VIN
LX
PGND
PGOOD
SGND
FIGURE 1. BLOCK DIAGRAM OF THE ISL8560
5 FN9244.7
September 19, 2008
5 Page 
Typical Performance Curves (Continued)
ISL8560
LX = 10V/DIV
VOUT = 2V/DIV
IL = 2A/DIV
PGOOD = 5V/DIV
FIGURE 28. OUTPUT SHORT CIRCUIT
Applications Information
Product Description
The ISL8560 is a non-synchronous, integrated FET 2A step
down regulator which operates from an unregulated input of
9V to 60V. The output voltage is user-adjustable with a pair
of external resistors. Frequency of operation is adjustable
from 100kHz to 600kHz set by RTCT. An external signal with
higher frequency can be injected to SYNCH to synchronize
the controller.
The buck controller drives an internal N-Channel MOSFET
and requires an external diode to deliver load current up to
2A. A Schottky diode is recommended for improved
efficiency and performance over a standard diode. The
converter output is regulated down to 1.21V from an input
source.
The PWM control loop uses a single output voltage loop with
input voltage feed forward which simplifies feedback loop
compensation and rejects input voltage variation. External
feedback loop compensation allows flexibility in output filter
component selection.
The buck regulator is equipped with a lossless current limit
scheme. The current limit in the buck regulator is achieved by
monitoring the drain-to-source current of the internal switching
power MOSFET. The current limit threshold is internally set at
4.5A peak. Additional features include programable soft-start to
support proper start-up of wide output capacitance range.
Start-Up and Shut-Down
When the EN pin is connected to a logic high, the ISL8560 is
in the shut-down mode. All the control circuitry and both
MOSFETs are off, and VOUT falls to zero. In this mode, the
total input current is less than 110µA.
When the EN pin is tied to GND, and VIN reaches
approximately 9V, the regulator begins to switch. The output
voltage is gradually increased to ensure proper soft-start
operation.
When the EN reaches logic LOW, the regulator repeats the
start-up procedure, including the soft-start function. Connect
a capacitor from SS pin to ground. This capacitor, along with
an internal 10µA current source sets the soft-start interval of
the converter, tSS.
CSS[μF] ≈ 8.3 ⋅ tSS[s]
(EQ. 1)
Operating Frequency
The ISL8560 can operate at switching frequencies from
100kHz to 600kHz. A resistor tied from the RTCT pin to VIN
and a capacitor from RTCT to GND are used to program the
switching frequency through Equation 2.
C1[nF]
=
R----6-[--.-k-2--Ω-5-----]
⎛
⎝
---------1----0---0---0-----------
fOSC[kHz]
–
0.3⎠⎞
(EQ. 2)
Caution: When the ISL8560 is in disabled state, the voltage
across RTCT pin will reach VIN voltage. Make sure that the
voltage rating of the RTCT capacitor is rated as high as the
input voltage.
Output Voltage Selection
The output voltage of the regulator can be programmed via
an external resistor divider that is used to scale the output
voltage relative to the internal reference voltage and feed it
back to the inverting input of the error amplifier. Refer to
Figure 30.
The output voltage programming resistor, R3, will depend on
the value chosen for the feedback resistor and the desired
output voltage of the regulator. The value for the feedback
resistor is typically between 1kΩ and 10kΩ.
R3
=
-----R----2-----×----1----.-2----1----V------
VOUT – 1.21V
(EQ. 3)
If the output voltage desired is 1.21V, then R3 is left
unpopulated.
11 FN9244.7
September 19, 2008
11 Page | ||
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| PDF Descargar | [ Datasheet ISL8560.PDF ] | |
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