ISL6527A.pdf 데이터시트 (총 16 페이지) - 파일 다운로드 ISL6527A 데이타시트 다운로드

No Preview Available !

Data Sheet
ISL6527, ISL6527A
September 29, 2015
FN9056.11
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6527, ISL6527A make simple work out of
implementing a complete control and protection scheme for
a DC/DC step-down converter. Designed to drive N-Channel
MOSFETs in a synchronous buck topology, the ISL6527,
ISL6527A integrate the control, output adjustment,
monitoring and protection functions into a single package.
The ISL6527, ISL6527A provide simple, single feedback loop,
voltage-mode control with fast transient response. The output
voltage can be regulated to as low as the provided external
reference. A fixed frequency oscillator reduces design
complexity, while balancing typical application cost and
efficiency.
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 cycles range from 0% to 100%.
Protection from overcurrent conditions is provided by
monitoring the rDS(ON) of the upper MOSFET to inhibit PWM
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
Features
• Operates from 3.3V to 5V Input
• Utilizes an External Reference
• Drives N-Channel MOSFETs
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
• Lossless, Programmable Overcurrent Protection
- Uses Upper MOSFET’s rDS(ON)
• Converter Can Source and Sink Current
• Small Converter Size
- Internal Fixed Frequency Oscillator
- ISL6527: 300kHz
- ISL6527A: 600kHz
• Internal Soft-Start
• 14 Ld SOIC or 16 Ld 5x5 QFN
• QFN package:
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Package Outline
- Near Chip-Scale Package Footprint, which Improves
PCB Efficiency and has a Thinner Profile
• Pb-Free (RoHS compliant)
Applications
• Power Supplies for Microprocessors
- PCs
- Embedded Controllers
• Subsystem Power Supplies
- PCI/AGP/GTL+ Busses
- ACPI Power Control
- DDR SDRAM Bus Termination Supply
• Cable Modems, Set-Top Boxes, and DSL Modems
• DSP and Core Communications Processor Supplies
• Memory Supplies
• Personal Computer Peripherals
• Industrial Power Supplies
• 3.3V Input DC/DC Regulators
• Low Voltage Distributed Power Supplies
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 2003-2008, 2015. 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.

No Preview Available !

ISL6527, ISL6527A
Ordering Information
PART NUMBER
(Note)
PART MARKING
TEMP
RANGE (°C)
PACKAGE
(Pb-Free)
PKG
DWG. #
ISL6527ACBZ*
6527ACBZ
0 to +70
14 Ld SOIC
M14.15
ISL6527ACRZ*
(No longer available, recommended replacement:
ISL6527ACBZ, ISL6527ACBZ-T)
ISL6527 ACRZ
0 to +70
16 Ld 5x5 QFN
L16.5x5B
ISL6527AIRZ*
(No longer available, recommended replacement:
ISL6527ACBZ, ISL6527ACBZ-T)
ISL6527 AIRZ
-40 to +85 16 Ld 5x5 QFN
L16.5x5B
ISL6527CRZ*
(No longer available, recommended replacement:
ISL6527ACBZ, ISL6527ACBZ-T)
ISL6527 CRZ
0 to +70
16 Ld 5x5 QFN
L16.5x5B
ISL6527IBZ*
(No longer available, recommended replacement:
ISL6527ACBZ, ISL6527ACBZ-T)
6527IBZ
-40 to +85 14 Ld SOIC
M14.15
ISL6527IRZ*
(No longer available, recommended replacement:
ISL6527ACBZ, ISL6527ACBZ-T)
ISL6527 IRZ
-40 to +85 16 Ld 5x5 QFN
L16.5x5B
ISL6527EVAL1
ISL6527 SOIC Evaluation Board
ISL6527EVAL2
ISL6527 QFN Evaluation Board
ISL6527AEVAL2
ISL6527A QFN Evaluation Board
*Add “-T” suffix for tape and reel. 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.
Pinouts
ISL6527, ISL6527A
(14 LD SOIC)
TOP VIEW
GND 1
LGATE 2
CPVOUT 3
CT1 4
CT2 5
OCSET/SD 6
FB 7
14 UGATE
13 BOOT
12 PHASE
11 VCC
10 CPGND
9 REF_IN
8 COMP
ISL6527, ISL6527A
(16 LD QFN)
TOP VIEW
CPVOUT
CT1
CT2
OCSET/SD
NO
16
1
2
3
LO4NGE5R
15 14
AVAILABLE
67
OR1S3UP11P12ORPVTEHCDACSE
10 CPGND
9 NC
8
2 FN9056.11
September 29, 2015

No Preview Available !

ISL6527, ISL6527A
Typical Application - 3.3V Input
3.3V
VIN
VREF
CIN
CPUMP
VCC
CT1 OCSET/SD
ROCSET
CBULK
CT2
CPGND
CPVOUT
ISL6527,
ISL6527A
BOOT
GND
UGATE
PHASE
REF_IN
COMP
LGATE
FB
DBOOT
CBOOT
CDCPL
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
3 FN9056.11
September 29, 2015

No Preview Available !

Typical Application - 5V Input
+5V
VIN
ISL6527, ISL6527A
VREF
VCC
CT1 OCSET/SD
ROCSET
N/C CT2
CPVOUT
ISL6527,
ISL6527A
DBOOT
CPGND
GND
BOOT
UGATE
CBOOT
PHASE
REF_IN
COMP
LGATE
FB
CIN
CBULK
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
Block Diagram
VCC
CPVOUT
CT1
CT2
CPGND
OCSET/SD
REF_IN
CHARGE
PUMP
20A
+
-
OC
COMPARATOR
POWER-ON
RESET (POR)
SOFT-START
ERROR
AMP
+
-
PWM
COMPARATOR
+
-
GATE
CONTROL
PWM LOGIC
FB
COMP
4
OSCILLATOR
FIXED 300kHz or 600kHz
GND
BOOT
UGATE
PHASE
LGATE
FN9056.11
September 29, 2015

No Preview Available !

ISL6527, ISL6527A
Functional Pin Description
14 LD (SOIC)
TOP VIEW
GND 1
LGATE 2
CPVOUT 3
CT1 4
CT2 5
OCSET/SD 6
FB 7
14 UGATE
13 BOOT
12 PHASE
11 VCC
10 CPGND
9 REF_IN
8 COMP
16 LD 5X5 (QFN)
TOP VIEW
16 15 14 13
CPVOUT 1
CT1 2
CT2 3
OCSET/SD 4
12 PHASE
11 VCC
10 CPGND
9 NC
5678
VCC
This pin provides the bias supply for the ISL6527, ISL6527A.
Connect a well-decoupled 3.3V supply to this pin.
COMP and FB
COMP and FB are two of the three available external pins of
the error amplifier. The FB pin is the inverting input of the
internal error amplifier and the COMP pin is the error
amplifier output. These pins are used to compensate the
voltage-control feedback loop of the converter.
REF_IN
This pin is the third available external pin of the error
amplifier and represents the non-inverting input to the error
amplifier. Connect the desired reference voltage to this pin.
Voltage applied to this pin must not exceed 1.5V.
GND
This pin represents the signal and power ground for the IC.
Tie this pin to the ground island/plane through the lowest
impedance connection available.
PHASE
Connect this pin to the upper MOSFET’s source. This pin is
used to monitor the voltage drop across the upper MOSFET
for overcurrent protection.
UGATE
Connect this pin to the upper MOSFET’s gate. This pin
provides the PWM-controlled gate drive for the upper
MOSFET. This pin is also monitored by the adaptive
shoot-through protection circuitry to determine when the
upper MOSFET has turned off.
BOOT
This pin provides ground referenced bias voltage to the
upper MOSFET driver. A bootstrap circuit is used to create a
voltage suitable to drive a logic-level N-channel MOSFET.
LGATE
Connect this pin to the lower MOSFET’s gate. This pin
provides the PWM-controlled gate drive for the lower
MOSFET. This pin is also monitored by the adaptive
shoot-through protection circuitry to determine when the
lower MOSFET has turned off.
OCSET/SD
Connect a resistor (ROCSET) from this pin to the drain of the
upper MOSFET (VIN). ROCSET, an internal 20µA current
source (IOCSET), and the upper MOSFET ON-resistance
(rDS(ON)) set the converter overcurrent (OC) trip point
according to Equation 1:
IPEAK = I--O-----C----S---r-E-D---T-S---x---RO-----ON----C----S----E----T--
(EQ. 1)
An overcurrent trip cycles the soft-start function.
Pulling OCSET/SD to a voltage level below 0.8V disables
the controller. Disabling the ISL6527, ISL6527A causes the
oscillator to stop, the LGATE and UGATE outputs to be held
low, and the soft-start circuitry to re-arm.
CT1 and CT2
These pins are the connections for the external charge
pump capacitor. A minimum of a 0.1µF ceramic capacitor is
recommended for proper operation of the IC.
CPVOUT
This pin represents the output of the charge pump. The
voltage at this pin is the bias voltage for the IC. Connect a
decoupling capacitor from this pin to ground. The value of
the decoupling capacitor should be at least 10x the value of
the charge pump capacitor. This pin may be tied to the
bootstrap circuit as the source for creating the BOOT
voltage.
CPGND
This pin represents the signal and power ground for the
charge pump. Tie this pin to the ground island/plane through
the lowest impedance connection available.
5 FN9056.11
September 29, 2015