DATASHEET

ISL6420BM
Data Sheet
November 11, 2011
Enhanced Product (EP) Advanced Single
Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6420BMAEP simplifies the implementation of a
complete control and protection scheme for a highperformance DC/DC buck converter. It is designed to drive
N-Channel MOSFETs in a synchronous rectified buck
topology, the ISL6420BMAEP integrates control, output
adjustment, monitoring and protection functions into a single
package. Additionally, the IC features an external reference
voltage tracking mode for externally referenced buck
converter applications and DDR termination supplies, as well
as a voltage margining mode for system testing in
networking DC/DC converter applications.
The ISL6420BMAEP provides simple, single feedback loop,
voltage mode control with fast transient response. The
output voltage of the converter can be precisely regulated to
as low as 0.6V, with a maximum tolerance of ±2.0% over
temperature and line voltage variations.
The operating frequency is fully adjustable from 100kHz to
1.4MHz. High frequency operation offers cost and space
savings.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate that enables high converter
bandwidth for fast transient response. The PWM duty cycle
ranges from 0% to 100% in transient conditions. Selecting
the capacitor value from the ENSS pin to ground sets a fully
adjustable PWM soft-start. Pulling the ENSS pin LOW
disables the controller.
The ISL6420BMAEP monitors the output voltage and
generates a PGOOD (power good) signal when soft-start
sequence is complete and the output is within regulation. A
built-in overvoltage protection circuit prevents the output
voltage from going above typically 115% of the set point.
Protection from overcurrent conditions is provided by
monitoring the rDS(ON) of the upper MOSFET to inhibit the
PWM operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sensing resistor.
Device Information
The specifications for an Enhanced Product (EP) device are
defined in a Vendor Item Drawing (VID), which is controlled
by the Defense Logistics Agency (DLA). “Hot-links” to the
applicable VID and other supporting application information
are provided on our website.
FN6574.1
Features
• Specifications per DLA VID V62/07640
• Full Mil-Temp Electrical Performance from -55°C to +125°C
• Controlled Baseline with One Wafer Fabrication Site and
One Assembly/Test Site
• Full Homogeneous Lot Processing in Wafer Fab
• No Combination of Wafer Fabrication Lots in Assembly
• Full Traceability Through Assembly and Test by
Date/Trace Code Assignment
• Enhanced Process Change Notification
• Enhanced Obsolescence Management
• Eliminates Need for Up-Screening a COTS Component
• Operates from 4.5V thru 5.5V and 5.6V thru 28V Inputs
• Excellent Output Voltage Regulation
- 0.6V Internal Reference
- ±2.0% Reference Accuracy Over Line and Temperature
• Resistor-Selectable Switching Frequency
- 100kHz to 1.4MHz
• Voltage Margining and External Reference Tracking
Modes
• Output Can Sink or Source Current
• Lossless, Programmable Overcurrent Protection
- Uses Upper MOSFET’s rDS(ON)
• Programmable Soft-Start
• 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
• Extensive Circuit Protection Functions
- PGOOD, Overvoltage, Overcurrent, Shutdown
• Diode Emulation during Startup for Pre-Biased Load
Applications
Applications
• Power Supplies for Microprocessors/ASICs
- DSP and Core Processors
- DDR SDRAM Bus Termination
• Distributed Power Systems
• Externally Referenced Buck Converters
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright © Intersil Americas Inc. 2007, 2011. All Rights Reserved
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ISL6420BM
Ordering Information
VENDOR PART NUMBER
(Notes 1, 2)
VENDOR ITEM DRAWING
ISL6420BMAEP
V62/07640-01XB
TEMP. RANGE (°C)
-55 to +125
PACKAGE
20 Ld QSOP
PKG.
DWG. #
M20.15
NOTES:
1. Add -TK suffix for 1,000 piece quantity tape and reel. Please refer to TB347 for details on reel specifications.
2. Devices must be procured to the VENDOR PART NUMBER.
Pinout
ISL6420BMAEP
(20 LD QSOP)
TOP VIEW
CDEL
1
PGND
2
19 ENSS
LGATE
3
18 COMP
20 PGOOD
PVCC
4
17 FB
PHASE
5
16 RT
UGATE
6
15 SGND
BOOT
7
14 VIN
GPIO2
8
13 VCC5
GPIO1/REFIN
9
12 VMSET/MODE
OCSET 10
11 REFOUT
2
FN6574.1
November 11, 2011
ISL6420BM
Shrink Small Outline Plastic Packages (SSOP)
Quarter Size Outline Plastic Packages (QSOP)
M20.15
N
INDEX
AREA
H
0.25(0.010) M
20 LEAD SHRINK SMALL OUTLINE PLASTIC PACKAGE
(0.150” WIDE BODY)
B M
E
GAUGE
PLANE
-B1
2
INCHES
3
L
0.25
0.010
SEATING PLANE
-A-
A
D
h x 45°
-C-
e
α
A2
A1
B
C
0.10(0.004)
0.17(0.007) M
C A M
B S
NOTES:
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Publication Number 95.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
MILLIMETERS
SYMBOL
MIN
MAX
MIN
MAX
NOTES
A
0.053
0.069
1.35
1.75
-
A1
0.004
0.010
0.10
0.25
-
A2
-
0.061
-
1.54
-
B
0.008
0.012
0.20
0.30
9
C
0.007
0.010
0.18
0.25
-
D
0.337
0.344
8.56
8.74
3
E
0.150
0.157
3.81
3.98
4
e
0.025 BSC
0.635 BSC
-
H
0.228
0.244
5.80
6.19
-
h
0.0099
0.0196
0.26
0.49
5
L
0.016
0.050
0.41
1.27
6
8°
0°
N
α
20
0°
20
3. Dimension “D” does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion and gate burrs shall not exceed 0.15mm
(0.006 inch) per side.
7
8°
Rev. 1 6/04
4. Dimension “E” does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per
side.
5. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. Dimension “B” does not include dambar protrusion. Allowable dambar protrusion shall be 0.10mm (0.004 inch) total in excess of “B” dimension at maximum material condition.
10. Controlling dimension: INCHES. Converted millimeter dimensions
are not necessarily exact.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. 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. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
3
FN6574.1
November 11, 2011
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