ISL6545ACRZ Intersil, ISL6545ACRZ Datasheet

IC PWM BUCK BST VM 10DFN

ISL6545ACRZ

Manufacturer Part Number
ISL6545ACRZ
Description
IC PWM BUCK BST VM 10DFN
Manufacturer
Intersil
Datasheet

Specifications of ISL6545ACRZ

Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
660kHz
Duty Cycle
100%
Voltage - Supply
4.5 V ~ 14.4 V
Buck
Yes
Boost
Yes
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 70°C
Package / Case
10-DFN
Frequency-max
660kHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
5V or 12V Single Synchronous Buck
Pulse-Width Modulation (PWM) Controller
The ISL6545, ISL6545A makes simple work out of
implementing a complete control and protection scheme for a
DC/DC stepdown converter driving N-Channel MOSFETs in a
synchronous buck topology. Since it can work with either 5V or
12V supplies, this one IC can be used in a wide variety of
applications within a system. The ISL6545, ISL6545A
(hereafter referred to as “ISL6545x”, except as needed)
integrates the control, gate drivers, output adjustment,
monitoring and protection functions into a single 8 Ld SOIC or
10 Ld DFN package.
The ISL6545x provides single feedback loop, voltage-mode
control with fast transient response. The output voltage can be
precisely regulated to as low as 0.6V, with a maximum
tolerance of ±1.0% over-temperature and line voltage
variations. A selectable fixed frequency oscillator (ISL6545 for
300kHz; ISL6545A for 600kHz) reduces design complexity,
while balancing typical application cost and efficiency.
The error amplifier features a 20MHz gain-bandwidth
product and 9V/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 r
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.
Pinout
LGATE/OCSET
LGATE/OCSET
UGATE
UGATE
DS(ON)
BOOT
BOOT
GND
GND
N/C
ISL6545, ISL6545A
ISL6545, ISL6545A
(10 LD 3x3 DFN)
1
2
3
4
1
2
3
4
5
of the lower MOSFET to inhibit PWM
(8 LD SOIC)
TOP VIEW
TOP VIEW
GND
1
Data Sheet
10
9
8
7
6 VCC
8
7
6
5
PHASE
COMP/SD
FB
N/C
PHASE
COMP/SD
FB
VCC
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
Features
• Operates from +5V or +12V Supply Voltage (for bias)
• Simple Single-Loop Control Design
• Fast Transient Response
• Lossless, Programmable Overcurrent Protection
• Small Converter Size in 8 Ld SOIC or 10 Ld DFN
• Pb-Free (RoHS Compliant)
Applications
• Power Supplies for Microprocessors or Peripherals
• Subsystem Power Supplies
• Cable Modems, Set Top Boxes, and DSL Modems
• Industrial Power Supplies; General Purpose Supplies
• 5V or 12V-Input DC/DC Regulators
• Low-Voltage Distributed Power Supplies
|
- 1.0V to 12V V
- 0.6V to V
- Integrated Gate Drivers use V
- 0.6V Internal Reference; ±1.0% tolerance
- Voltage-Mode PWM Control
- Drives N-Channel MOSFETs
- Traditional Dual Edge Modulator
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
- Uses Lower MOSFET’s r
- 300kHz or 600kHz Fixed Frequency Oscillator
- Fixed Internal Soft-Start, Capable into a Pre-biased
- Integrated Boot Diode
- Enable/Shutdown Function on COMP/SD Pin
- Output Current Sourcing and Sinking
- PCs, Embedded Controllers, Memory Supplies
- DSP and Core Communications Processor Supplies
- PCI, AGP; Graphics Cards; Digital TV
- SSTL-2 and DDR/DDR2/DDR3 SDRAM Bus
Copyright Intersil Americas Inc. 2006, 2007, 2009, 2011. All Rights Reserved
restrictions; see Input Voltage Considerations)
Load
Termination Supply
All other trademarks mentioned are the property of their respective owners.
March 3, 2011
IN
Output Range
IN
Input Range (up to 20V possible with
ISL6545, ISL6545A
DS(ON)
CC
(5V to 12V)
FN6305.6

Related parts for ISL6545ACRZ

ISL6545ACRZ Summary of contents

Page 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 Inc. 2006, 2007, 2009, 2011. All Rights Reserved Intersil (and design trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. ISL6545, ISL6545A FN6305.6 ...

Page 2

... ISL6545ACBZ 6545 ACBZ ISL6545IBZ 6545 IBZ ISL6545AIBZ 6545 AIBZ ISL6545CRZ 545Z ISL6545ACRZ 45AZ ISL6545IRZ 45IZ ISL6545AIRZ 5ARZ NOTES: 1. Add “-T*” suffix for tape and reel. Please refer to 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) ...

Page 3

Block Diagram SAMPLE AND HOLD 21.5µA TO LGATE/OCSET FB 5V int. 20μA COMP/SD Typical Application C DCPL Type II R OFFSET compensation shown 3 ISL6545, ISL6545A POR AND + SOFT-START - OC COMPARATOR 5V int. ERROR ...

Page 4

... CC + 0.3V Maximum Storage Temperature Range . . . . . . . . . -65°C to +150° 0.3V Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . .see link below BOOT <36V) http://www.intersil.com/pbfree/Pb-FreeReflow.asp BOOT-GND . . . . . . . . . . . . .15V Operating Conditions Supply Voltage, V Ambient Temperature Range ISL6545C, ISL6545AC 0°C to +70°C ISL6545I, ISL6545AI . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C Junction Temperature Range .-40°C to +125° +85° ...

Page 5

Electrical Specifications V = 12V -40°C to +85°C. (Continued) PARAMETER Upper Gate Source Impedance Upper Gate Sink Impedance Lower Gate Source Impedance Lower Gate Sink Impedance PROTECTION/DISABLE OCSET Current Source Disable Threshold (COMP/SD pin) NOTE: 7. Compliance to ...

Page 6

Functional Description Initialization (POR and OCP Sampling) Figure 1 shows a simplified timing diagram. The Power-On-Reset (POR) function continually monitors the bias voltage at the VCC pin. Once the rising POR threshold is exceeded (VPOR ~4V nominal), the POR function ...

Page 7

Any resistive load connected to the output will help pull down the voltage (at the RC rate of the R of the load and the C of the ...

Page 8

The overcurrent function will trip at a peak inductor current (I determined by Equation 1: PEAK) × OCSET OCSET I = ---------------------------------------------------------- - PEAK where I is the internal OCSET current source ...

Page 9

Application” on page 3 for more detail; R resistor; R (shortened to R below) is the lower one. OFFSET O The recommended value for R is 1kΩ to 5kΩ (±1% for S accuracy) and then R is chosen according to ...

Page 10

Current Sinking The ISL6545x 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 ...

Page 11

COMP - FB + E/A VREF OSCILLATOR V OSC PWM CIRCUIT UGATE HALF-BRIDGE DRIVE PHASE LGATE ISL6545x EXTERNAL CIRCUIT FIGURE 9. VOLTAGE-MODE BUCK CONVERTER COMPENSATION DESIGN The modulator transfer function is the small-signal transfer function of V ...

Page 12

... SW This is just one method to calculate compensation components; there are variations of Equations 3 through 9. The error amp is similar to that on other Intersil regulators, so existing tools can be used here as well. Special consideration is needed if the size of a ceramic output capacitance in parallel with bulk capacitors gets too large; ...

Page 13

Minimizing the response time can minimize the output capacitance required. The response time to a transient is different for the application of load and the removal of load. The equations in Equation 11 give the approximate response time interval for ...

Page 14

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

Page 15

Package Outline Drawing L10.3x3C 10 LEAD DUAL FLAT PACKAGE (DFN) Rev 2, 09/09 3.00 6 PIN 1 INDEX AREA C B (4X) 0.10 TOP VIEW PACKAGE (10 x 0.60) OUTLINE (10x 0.25) (8x 0.50) 1.64 TYPICAL RECOMMENDED LAND PATTERN 15 ...

Page 16

Package Outline Drawing M8.15 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE Rev 2, 11/10 INDEX AREA TOP VIEW 5.00 (0.197) 4.80 (0.189) 1.27 (0.050) 0.51(0.020) 0.33(0.013) SIDE VIEW “A 16 ISL6545, ISL6545A DETAIL "A" 6.20 (0.244) ...

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