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DATASHEET
ISL6406
Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
FN9073
Rev 9.00
Oct 21, 2015
The ISL6406 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.
Designed to drive N-Channel MOSFETs in synchronous
buck topology, the ISL6406 integrates the control, output
adjustment and protection functions into a single package.
The ISL6406 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.
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 to 700kHz
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.
• External Frequency Synchronization
• 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
• Pb-Free (RoHS compliant)
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
Ordering Information
• Personal Computer Peripherals
PART NUMBER
(Note)
PART MARKING
TEMP. RANGE (°C)
PACKAGE
(RoHS Compliant)
PKG. DWG. #
ISL6406IBZ* (No longer available,
6406IBZ
recommended replacement: ISL6406IVZ)
-40 to +85
16 Ld SOIC
M16.15
ISL6406IRZ* (No longer available or
supported)
ISL6406 IRZ
-40 to +85
16 Ld 5x5 QFN
L16.5x5B
ISL6406IVZ*
6406 IVZ
-40 to +85
16 Ld TSSOP
M16.173
*Add “-T” suffix to part number for tape and reel packaging. 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.
FN9073 Rev 9.00
Oct 21, 2015
Page 1 of 18

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ISL6406
Pinouts
ISL6406,
(16 LD 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,
(16 LD QFN)
TOP VIEW
16 15 14 13
CPVOUT 1
OCSET 2
CT1 3
CT2 4
12 PHASE
11 VCC
10 CPGND
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
FN9073 Rev 9.00
Oct 21, 2015
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ISL6406
Typical Application Schematic for 5V Input
VIN
5V ±10%
CIN
VCC
CT1 OCSET
NC CT2
CPVOUT
ISL6406
DBOOT
RT BOOT
CPGND
CBOOT
RT
GND
UGATE
VCC
VOUT
SYNC/EN
COMP
PHASE
LGATE
FB
CBULK
rOCSET
CDCPL
RBOOT
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
Typical Application Schematic for 3.3V Input
VIN
3.3V ±10%
CIN
VCC
CT1 OCSET
CPUMP
RT
VCC
CT2
RT
CPGND
GND
ISL6406
CPVOUT
DBOOT
BOOT
CBOOT
UGATE
VOUT
PHASE
SYNC/ EN
COMP
LGATE
FB
CBULK
rOCSET
CDCPL
RBOOT
CHF
Q1 LOUT
Q2 COUT
CI
RF CF
ROFFSET
RFB
VOUT
FN9073 Rev 9.00
Oct 21, 2015
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ISL6406
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
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3V ±10%
Thermal Information
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
16 Ld SOIC (Note 2) . . . . . . . . . . . . . .
70
N/A
16 Ld TSSOP (Note 2) . . . . . . . . . . . . .
90
N/A
16 Ld QFN (Notes 3, 4) . . . . . . . . . . . .
35
4.5
Maximum Junction Temperature (Plastic Package) .-55°C to +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
1. Please refer to the Typical Application Schematics (page 3) for 3.3V/5V input configuration.
2. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
3. JA 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 JC, 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 “Functional Block Diagram” on page 2
and Typical Application Schematic beginning on page 2. VCC = +3.3V. Parameters with MIN and/or MAX limits
are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and
are not production tested.
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
-1.5 -
1.5 %
ERROR AMPLIFIER
TA = 0°C to +70°C
TA = -40°C to +85°C
-1.8 -
-2.1 -
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 = 0°C to +70°C
TA = -40°C to +85°C
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
Sync. Frequency Range (Note 6)
Peak-to-Peak VOSC
1.1 1.4 1.7
V
1.1x the natural switching frequency.
110
-
770 kHz
Minimum Sync Pulse Width (Note 6)
- 40 100 ns
FN9073 Rev 9.00
Oct 21, 2015
Page 4 of 18

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ISL6406
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram” on page 2
and Typical Application Schematic beginning on page 2. VCC = +3.3V. Parameters with MIN and/or MAX limits
are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and
are not production tested. (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
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 = 0°C to +70°C
f = 300kHz, TA = -40°C to +85°C
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 = 0°C to +70°C
TA = -40°C to +85°C
NOTES:
5. This is the VCC current consumed when the device is active but not switching.
6. Limits established by characterization and are not production tested.
18 20 22 µA
16 20 23 µA
Typical Performance Curve
0.810
0.805
0.800
0.795
0.790
0.785
0.780
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
FIGURE 1. REFERENCE VOLTAGE vs TEMPERATURE
FN9073 Rev 9.00
Oct 21, 2015
Page 5 of 18