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ISL6522A の電気的特性と機能

ISL6522AのメーカーはIntersil Corporationです、この部品の機能は「Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL6522A
部品説明 Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL6522A Datasheet, ISL6522A PDF,ピン配置, 機能
®
Data Sheet
July 2003
ISL6522A
FN9122.1
Buck and Synchronous Rectifier
Pulse-Width Modulator (PWM) Controller
The ISL6522A provides complete control and protection for a
DC-DC converter optimized for high-performance
microprocessor applications. It is designed to drive two
N-Channel MOSFETs in a synchronous rectified buck
topology. The ISL6522A integrates all of the control, output
adjustment, monitoring and protection functions into a single
package.
The output voltage of the converter can be precisely
regulated to as low as 0.8V, with a maximum tolerance of
±0.5% over temperature and line voltage variations.
The ISL6522A provides simple, single feedback loop,
voltage-mode control with fast transient response. It includes
a 200kHz free-running triangle-wave oscillator that is
adjustable from below 50kHz to over 1MHz. The error
amplifier features a 15MHz gain-bandwidth product and
6V/µs slew rate which enables high converter bandwidth for
fast transient performance. The resulting PWM duty ratio
ranges from 0–100%.
The ISL6522A protects against overcurrent conditions by
inhibiting PWM operation. The ISL6522A monitors the
current by using the rDS(ON) of the upper MOSFET which
eliminates the need for a current sensing resistor.
Pinout
ISL6522ACR (16 LEAD QFN)
TOP VIEW
16 15 14 13
SS 1
COMP 2
FB 3
12 PVCC
11 LGATE
10 PGND
EN 4
9 BOOT
5678
Features
• Drives two N-Channel MOSFETs
• Operates from +5V or +12V input
• Simple single-loop control design
- Voltage-mode PWM control
• Fast transient response
- High-bandwidth error amplifier
- Full 0–100% duty ratio
• Excellent output voltage regulation
- 0.8V internal reference
- ±0.5% over line voltage and temperature
• Overcurrent fault monitor
- Does not require extra current sensing element
- Uses MOSFETs rDS(ON)
• Converter can source and sink current
• Small converter size
- Constant frequency operation
- 200kHz free-running oscillator programmable from
50kHz to over 1MHz
• 16 Lead 5x5mm QFN Package
• QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat
No Leads-Product Outline.
- Near Chip-Scale Package Footprint; Improves PCB
Efficiency and Thinner in Profile
Applications
• Power supply for Pentium®, Pentium Pro, PowerPC® and
AlphaPC™ microprocessors
• High-power 5V to 3.xV DC-DC regulators
• Low-voltage distributed power supplies
Ordering Information
PART NUMBER
ISL6522ACR
TEMP.
RANGE (oC)
PACKAGE
25 to 70 16 Ld 5x5 QFN
PKG.
DWG. #
L16.5x5B
1 CCAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.

1 Page





ISL6522A pdf, ピン配列
ISL6522A
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Boot Voltage, VBOOT - VPHASE. . . . . . . . . . . . . . . . . . . . . . . +15.0V
Input, Output or I/O Voltage . . . . . . . . . . . . GND -0.3V to VCC +0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . +12V ±10%
Ambient Temperature Range, ISL6522AC. . . . . . . . . . 25oC to 70oC
Junction Temperature Range, ISL6522AC. . . . . . . . . . 0oC to 125oC
Thermal Information
Thermal Resistance
θJA(oC/W) θJC(oC/W)
QFN Package (Notes 1, 2) . . . . . . . . . .
36
5
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
(SOIC - Lead Tips Only)
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. SeeTech
Brief TB379.
2. For θJC, the "case temp" location is the center of the exposed metal pad on the package underside.
Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted
PARAMETER
SYMBOL
TEST CONDITIONS
VCC SUPPLY CURRENT
Nominal Supply
Shutdown Supply
ICC EN = VCC; UGATE and LGATE Open
EN = 0V
POWER-ON RESET
Rising VCC Threshold
Falling VCC Threshold
Enable-Input Threshold Voltage
Rising VOCSET Threshold
OSCILLATOR
VOCSET = 4.5VDC
VOCSET = 4.5VDC
VOCSET = 4.5VDC
Free Running Frequency
Total Variation
Ramp Amplitude
REFERENCE
VOSC
RT = OPEN, VCC = 12
6k< RT to GND < 200k
RT = OPEN
Reference Voltage Tolerance
Reference Voltage
VREF
ERROR AMPLIFIER
DC Gain
Gain-Bandwidth Product
GBW
Slew Rate
SR COMP = 10pF
GATE DRIVERS
Upper Gate Source
Upper Gate Sink
Lower Gate Source
Lower Gate Sink
PROTECTION
IUGATE
RUGATE
ILGATE
RLGATE
VBOOT - VPHASE = 12V, VUGATE = 6V
ILGATE = 0.3A
VCC = 12V, VLGATE = 6V
ILGATE = 0.3A
OCSET Current Source
Soft-Start Current
IOCSET
ISS
VOCSET = 4.5VDC
MIN TYP MAX UNITS
- 5 - mA
-
50 100
µA
- - 10.4
8.8 -
-
0.8 - 2.0
- 1.27 -
V
V
V
V
175 200 230
-20 - +20
- 1.9 -
-0.5 - 0.5
- 0.800 -
kHz
%
VP-P
%
V
- 88 -
dB
- 15 - MHz
- 6 - V/µs
350 500
-
- 5.5 10
300 450
-
- 3.5 6.5
mA
mA
170 200 230
- 10 -
µA
µA
3


3Pages


ISL6522A 電子部品, 半導体
ISL6522A
is reference to VIN. When the voltage across the upper
MOSFET (also referenced to VIN) exceeds the voltage
across ROCSET, the overcurrent function initiates a soft-start
sequence. The soft-start function discharges CSS with a
10µA current sink and inhibits PWM operation. The soft-start
function recharges CSS, and PWM operation resumes with
the error amplifier clamped to the SS voltage. Should an
overload occur while recharging CSS, the soft-start function
inhibits PWM operation while fully charging CSS to 4V to
complete its cycle. Figure 4 shows this operation with an
overload condition. Note that the inductor current increases
to over 15A during the CSS charging interval and causes an
overcurrent trip. The converter dissipates very little power
with this method. The measured input power for the
conditions of Figure 4 is 2.5W.
The overcurrent function will trip at a peak inductor current
(IPEAK) determined by:
IPEAK
=
I--O-----C----S----E----T---------R----O-----C----S----E----T--
rDS(ON)
where IOCSET is the internal OCSET current source (200µA
is typical). The OC trip point varies mainly due to the
MOSFETs rDS(ON) variations. To avoid overcurrent tripping
in the normal operating load range, find the ROCSET resistor
from the equation above with:
The maximum rDS(ON) at the highest junction temperature.
1. The minimum IOCSET from the specification table.
2. Determine IPEAK for IPEAK > IOUT(MAX) + (∆I) ⁄ 2 ,
where I is the output inductor ripple current.
For an equation for the ripple current see the section under
component guidelines titled Output Inductor Selection.
A small ceramic capacitor should be placed in parallel with
ROCSET to smooth the voltage across ROCSET in the
presence of switching noise on the input voltage.
Current Sinking
The ISL6522A incorporates a MOSFET shoot-through
protection method which allows a converter to sink current
as well as source current. Care should be exercised when
designing a converter with the ISL6522A when it is known
that the converter may sink current.
When the converter is sinking current, it is behaving as a boost
converter that is regulating its input voltage. This means that the
converter is boosting current into the VIN rail, the voltage that is
being down-converted. If there is nowhere for this current to go,
such as to other distributed loads on the VIN rail, through a
voltage limiting protection device, or other methods, the
capacitance on the VIN bus will absorb the current. This
situation will cause the voltage level of the VIN rail to increase. If
the voltage level of the rail is boosted to a level that exceeds the
maximum voltage rating of the MOSFETs or the input
capacitors, damage may occur to these parts. If the bias
voltage for the ISL6522A comes from the VIN rail, then the
maximum voltage rating of the ISL6522A may be exceeded and
the IC will experience a catastrophic failure and the converter
will no longer be operational. Ensuring that there is a path for
the current to follow other than the capacitance on the rail will
prevent these failure modes.
Application Guidelines
Layout Considerations
As in any high frequency switching converter, layout is very
important. Switching current from one power device to
another can generate voltage transients across the
impedances of the interconnecting bond wires and circuit
traces. These interconnecting impedances should be
minimized by using wide, short printed circuit traces. The
critical components should be located as close together as
possible using ground plane construction or single point
grounding.
Figure 5 shows the critical power components of the
converter. To minimize the voltage overshoot the
interconnecting wires indicated by heavy lines should be part
of ground or power plane in a printed circuit board. The
components shown in Figure 6 should be located as close
together as possible. Please note that the capacitors CIN
and CO each represent numerous physical capacitors.
Locate the ISL6522A within three inches of the MOSFETs,
Q1 and Q2. The circuit traces for the MOSFETs’ gate and
source connections from the ISL6522A must be sized to
handle up to 1A peak current.
ISL6522A
UGATE
PHASE
VIN
Q1
LO
VOUT
LGATE
PGND
Q2 D2
CIN
CO
RETURN
FIGURE 5. PRINTED CIRCUIT BOARD POWER AND
GROUND PLANES OR ISLANDS
Figure 6 shows the circuit traces that require additional
layout consideration. Use single point and ground plane
construction for the circuits shown. Minimize any leakage
current paths on the SS PIN and locate the capacitor, CSS
close to the SS pin because the internal current source is
only 10µA. Provide local VCC decoupling between VCC and
GND pins. Locate the capacitor, CBOOT as close as practical
to the BOOT and PHASE pins.
6

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共有リンク

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部品番号部品説明メーカ
ISL6522

Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller

Intersil Corporation
Intersil Corporation
ISL6522A

Buck and Synchronous Rectifier Pulse-Width Modulator (PWM) Controller

Intersil Corporation
Intersil Corporation
ISL6522B

Buck and Synchronous Rectifier

Intersil Corporation
Intersil Corporation


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