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®
Data Sheet
ISL6406, ISL6426
October 2003
FN9073.4
Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
The ISL6406, ISL6426 is an adjustable frequency,
synchronous buck switching regulator optimized for
generating lower voltages for the distributed DC-DC
architectures. The ISL6406 offers an adjustable output
voltage, while the ISL6426 provides a fixed 1.8V output.
Designed to drive N-Channel MOSFETs in synchronous
buck topology, the ISL6406, ISL6426 integrates the control,
output adjustment and protection functions into a single
package.
The ISL6406, ISL6426 provides simple, single feedback
loop, voltage-mode control with fast transient response. The
output voltage can be precisely regulated to as low as 0.8V.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate which enables high converter
bandwidth for fast transient performance.
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.
The wide programmable switching frequency range of
100kHz to 700kHz allows the use of small surface mount
inductors and capacitors. The device also provides external
frequency synchronization making it an ideal choice for
DC-DC converter applications.
Ordering Information
TEMP. RANGE
PART NUMBER (oC) PACKAGE PKG. NO.
ISL6406CB
0 to 70
16 Ld SOIC M16.15
ISL6406IB
-40 to 85 16 Ld SOIC M16.15
ISL6406CR
0 to 70
16 Ld QFN
L16.5x5B
ISL6406IR
-40 to 85 16 Ld QFN L16.5x5B
ISL6406CV
0 to 70
16 Ld TSSOP M16.173
ISL6406IV
-40 to 85 16 Ld TSSOP M16.173
ISL6406CVZ (Note)
0 to 70
16 Ld TSSOP M16.173
ISL6406IVZ (Note)
-40 to 85 16 Ld TSSOP M16.173
ISL6426CB
0 to 70
16 Ld SOIC M16.15
ISL6426IB
-40 to 85 16 Ld SOIC M16.15
ISL6426CR
0 to 70
16 Ld QFN
L16.5x5B
ISL6426IR
-40 to 85 16 Ld QFN L16.5x5B
ISL6426CV
0 to 70
16 Ld TSSOP M16.173
ISL6426IV
-40 to 85 16 Ld TSSOP M16.173
Features
• Operates from 3.3V/5V Input
• 0.8V to VIN Output Range
- 0.8V Internal Reference
- ±1.5% Reference Accuracy
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
• Lossless, Programmable Overcurrent Protection
- Uses Upper MOSFET’s rDS(on)
• Programmable Switching Frequency 100kHz–700kHz
• External Frequency Synchronization
• Two Device Options Available
- ISL6406 . . . . . . . . . . . . . . . . Adjustable Output Voltage
- ISL6426 . . . . . . . . . . . . . . . . . . . . . . Fixed 1.8V Output
• Internal Soft-Start
• QFN Package Option
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline
- QFN Near Chip Scale Package Footprint; Improves
PCB Efficiency, Thinner in Profile
• Lead Free TSSOP Packaging Available
- Designated with “Z” Suffix (Refer to Note Below)
Applications
• 3V/5V DC-DC Converter Modules
• Distributed DC-DC 3.3V, 2.5V and 1.8V Power
Architectures for DSP, Logic, and Memory
• Power Supplies for Microprocessors
- PCs
- Embedded Controllers
• Memory Supplies
• Personal Computer Peripherals
NOTE: “Z” Suffix: These products are packaged in 16 ld TSSOP
packages that are MSL level 1 at 255-260oC peak reflow
temperature, which exceeds the IPC J Std-020B requirements for
MSL level 1. The lead free and green products employ special lead
free material sets including 100% matte tin plate termination finish,
which is compatible with either Sn/Pb or lead free soldering
operations.
Tape and Reel available. Add “-T” suffix for Tape and Reel Packing
Option.
1
CAUTION: 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.

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Pinouts
ISL6406, ISL6426 (SOIC/TSSOP)
TOP VIEW
GND 1
LGATE 2
CPVOUT 3
OCSET 4
CT1 5
CT2 6
RT 7
SYNC/EN 8
16 UGATE
15 BOOT
14 PHASE
13 VCC
12 CPGND
11 COMP
10 VOUT
9 FB
ISL6406, ISL6426
ISL6406, ISL6426 (QFN)
TOP VIEW
16 15 14 13
CPVOUT 1
12 PHASE
OCSET 2
CT1 3
11 VCC
10 CPGND
CT2 4
9 COMP
5678
Functional Block Diagram
VCC
CPVOUT
CT1
CT2
CPGND
OCSET
CHARGE
PUMP
20µA
SDWN
POWER-ON
RESET (POR)
+
-
OC
COMPARATOR
SOFTSTART
FB
VOUT
COMP
+
0.8V
-
ERROR
AMP
+
-
PWM
COMPARATOR
+
-
SDWN
GATE
CONTROL
PWM LOGIC
OSCILLATOR
SYNC/EN
RT
GND
BOOT
UGATE
PHASE
LGATE
2

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ISL6406, ISL6426
Typical Application Schematic for 5V Input
VIN
5V ±10%
CIN
NC
RT
VCC
VCC
CT1 OCSET
ROCSET
CBULK
CT2 CPVOUT
ISL6406, ISL6426
RT
CPGND
BOOT
GND
VOUT
SYNC/EN
COMP
UGATE
PHASE
LGATE
FB
DBOOT
CBOOT
CDCPL
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
Typical Application Schematic for 3.3V Input
VIN
3.3V ±10%
CIN
CPUMP
RT
VCC
VCC
CT1 OCSET
ROCSET
CBULK
CPVOUT
CT2 ISL6406, ISL6426
RT
BOOT
CPGND
GND
VOUT
SYNC/ EN
COMP
UGATE
PHASE
LGATE
FB
DBOOT
CBOOT
CDCPL
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
3

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ISL6406, ISL6426
Absolute Maximum Ratings
Supply Voltage, VCC (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . +7.0V
Absolute Boot Voltage, VBOOT . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Upper Driver Supply Voltage, VBOOT - VPHASE . . . . . . . . . . . +6.0V
Input, Output or I/O Voltage . . . . . . . . . . . GND -0.3V to VCC +0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Operating Conditions
Temperature Range
ISL6406, ISL6426C . . . . . . . . . . . . . . . . . . . . . . . . . . 0oC to 70oC
ISL6406, ISL6426I . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC
Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3V ±10%
Thermal Information
Thermal Resistance (Typical)
θJA (oC/W) θJC (oC/W)
16 Lead SOIC (Note 2) . . . . . . . . . . . .
70
N/A
16 Lead TSSOP (Note 2) . . . . . . . . . . .
90
N/A
16 Lead QFN (Notes 3, 4) . . . . . . . . . .
35
5
Maximum Junction Temperature (Plastic Package) . -55oC to 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.
NOTES:
1. Please refer to the Typical Application Schematics (page 3) for 3.3V / 5V input configuration.
2. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
3. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
4. 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. Refer to Block Diagram and Typical Application
Schematic. VCC = +3.3V. Typical values are at TA = 25oC.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VCC SUPPLY
Shutdown Supply Current
SYNC/EN = GND
- 20 50 µA
Operating Supply Current (Note 5)
RT = 64.9k
7 9.8 11.5 mA
REFERENCE VOLTAGE
Nominal Reference Voltage
- 0.8 -
V
Reference Voltage Tolerance
ERROR AMPLIFIER
TA = 0oC to 70oC
TA = -40oC to +85oC
-1.5 -
-1.8 -
-2.1 -
1.5 %
1.8 %
2.1 %
Open Loop Voltage Gain (Note 6)
- 82 - dB
Gain-Bandwidth Product (Note 6)
14 -
- MHz
Slew Rate (Note 5)
COMP = 10pF
4.65 6.0
9.2 V/µs
CHARGE PUMP
Nominal Charge Pump Output
Charge Pump Output Regulation
VCC = 3.3V, No Load
4.8 5.1 5.5
-5.0 -
5.0
V
%
POWER-ON RESET
Rising CPVOUT POR Threshold
CPVOUT POR Threshold Hysteresis
TA = 0oC to 70oC
TA = -40oC to +85oC
4.20 4.35
4.1 4.35
0.3 0.5
4.5
4.6
0.9
V
V
V
OSCILLATOR
Gate Output Frequency Range
RT = 200k
80 100 120 kHz
RT = 64.9k
250 300 340 kHz
RT = 26.1k
650 715 770 kHz
Sawtooth Amplitude
Peak-to-Peak VOSC
1.1 1.4 1.7
V
4

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ISL6406, ISL6426
Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application
Schematic. VCC = +3.3V. Typical values are at TA = 25oC. (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Sync. Frequency Range (Note 6)
1.1 Times the natural switching
frequency.
110 - 770 kHz
Minimum Sync Pulse Width (Note 6)
- 40 100 ns
PWM Maximum Duty Cycle
- 96 - %
GATE DRIVER OUTPUT (Note 6)
Upper Gate Source Current
Upper Gate Sink Current
VBOOT - VPHASE = 5V, VUGATE = 4V
-
-1
-
A
-1-A
Lower Gate Source Current
Lower Gate Sink Current
VVCC = 3.3V, VLGATE = 4V
- -1 - A
-2-A
SOFT-START
Soft-Start Slew Rate
f = 300kHz, TA = 0oC to 70oC
f = 300kHz, TA = -40oC to +85oC
Internal Digital Circuit Clock Count
(Soft-start time varies with frequency)
6.2
6.2
-
6.7
6.7
2048
7.3 ms
7.6 ms
- Clk Cycles
OVERCURRENT
OCSET Current Source
TA = 0oC to 70oC
TA = -40oC to +85oC
NOTES:
5. This is the VCC current consumed when the device is active but not switching.
6. Guaranteed by design.
18 20 22 µA
16 20 23 µA
Typical Performance Curve
0.81
0.805
0.8
0.795
0.79
0.785
0.78
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
FIGURE 1. REFERENCE VOLTAGE vs TEMPERATURE
5