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NORTECROEMCOMMENMDEENDIDSERL®D6E5PF4LO0AARCNEDEMaWtEaNDSTEhPSeAIeGRtNTS
Single-Phase Buck PWM Controller with
Integrated High Speed MOSFET Driver
and Pre-Biased Load Capability
The ISL6540 is a single-phase voltage-mode PWM controller
with input voltage feedforward compensation to maintain a
constant loop gain for optimal transient response, especially for
applications with a wide input voltage range. Its integrated high
speed synchronous rectified MOSFET drivers and other
sophisticated features provide complete control and protection
for a DC/DC converter with minimum external components,
resulting in minimum cost and less engineering design efforts.
The output voltage of the converter can be precisely regulated
with an internal reference voltage of 0.591V, and has a system
tolerance of ±0.85% over commercial temperature and line load
variations. An external voltage can be used in place of the
internal reference for voltage tracking/DDR applications.
The ISL6540 has an internal linear regulator or external linear
regulator drive options for applications with only a single supply
rail. The internal oscillator is adjustable from 250kHz to 2MHz.
The integrated voltage margining, programmable pre-biased
soft-start, differential remote sensing amplifier, and
programmable input voltage POR features enhance the
ISL6540 value.
Pinout
ISL6540
(28 LD 5x5 QFN)
TOP VIEW
28 27 26 25 24 23 22
VSEN+ 1
21 BOOT
VSEN- 2
20 UGATE
REFOUT 3
REFIN 4
SS 5
GND
BOTTOM
SIDE PAD
19 PHASE
18 PGND
17 LGATE
OFS+ 6
16 PVCC
OFS- 7
15 LINDRV
8 9 10 11 12 13 14
ISL6540
July 23, 2008
FN9214.1
Features
• VIN and Power Rail Operation from +3.3V to +20V
• Fast Transient Response - 0 to 100% Duty Cycle
- 15MHz Bandwidth Error Amplifier with 6V/μs Slew Rate
- Voltage-Mode PWM Leading and Trailing-edge
Modulation Control
- Input Voltage Feedforward Compensation
• 2.9V to 5.6V High Speed 2A/4A MOSFET Gate Drivers
- Tri-state for Power Stage Shutdown
Internal Linear Regulator (LR) - 5.6V Bias from VIN
External LR Drive for Optimal Thermal Performance
• Voltage Margining with Independently Adjustable Upper and
Lower Settings for System Stress Testing & Over Clocking
Reference Voltage I/O for DDR/Tracking Applications
Precise 0.591V Internal Reference with Buffered Output
- ±0.85%/±1.25% Over Commercial/Industrial Range
Source and Sink Overcurrent Protections
- Low- and High-Side MOSFET rDS(ON) Sensing
Overvoltage and Undervoltage Protections
Small Converter Size - QFN package
• Oscillator Programmable from 250kHz to 2MHz
• Differential Remote Voltage Sensing with Unity Gain
• Programmable Soft-start with Pre-Biased Load Capability
• Power Good Indication with Programmable Delay
• EN Input with Voltage Monitoring Capability
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
Power Supply for some Microprocessors and GPUs
Wide and Narrow Input Voltage Range Buck Regulators
Point of Load Applications
Low-Voltage and High Current Distributed Power Supplies
Ordering Information
PART
NUMBER*
(Note)
PART
TEMP. PACKAGE PKG.
MARKING RANGE (°C) (Pb-Free) DWG. #
ISL6540CRZ ISL6540CRZ 0 to 70 28 Ld QFN L28.5x5
ISL6540CRZA ISL6540CRZ 0 to 70 28 Ld QFN L28.5x5
ISL6540IRZA ISL6540IRZ -40 to 85 28 Ld QFN L28.5x5
*Add “-T” suffix for tape and reel.
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.
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Block Diagram
ISL6540
2 FN9214.1
July 23, 2008

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ISL6540
Typical Application I (Internal Linear Regulator with Remote Sense)
+3.3V to +20V
RCC
CF1
LIN DBOOT
CF2
RBOOT
CHFIN
CBIN
VCC
PVCC
VIN Internal 5.6V Bias
Linear Regulator
VFF
BOOT
HSOC
RHSOC
CF3
VCC
EN
REFIN
REFOUT
PG
CPG_DLY PG_DLY
RFS FS
ISL6540
UGATE
CHSOC
PHASE
LGATE
PGND
LSOC RLSOC
CLSOC
COMP
Q1
Q2
CBOOT
LOUT
CHFOUT
MARCTRL
ROFS+
RMARG
ROFS-
OFS+
OFS-
CSS
SS
C1
FB
VMON
VSEN+
C2
ZFB
R2
LINDRV
GND GND
VSEN-
C3 R3
R1 ZIN
CSEN
RFB
ROS
VOUT
CBOUT
10Ω 10Ω
VSENSE+
VSENSE-
3 FN9214.1
July 23, 2008

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ISL6540
Typical Application II (External Linear Regulator without Remote Sense)
+3.3V to +20V
RDRV
CLC RLC
LINDRV
CF3
VCC
CPG_DLY
VIN
VFF
REFOUT
REFIN
EN
PG
PG_DLY
RFS FS
ROFS+
MARCTRL
OFS+
CF1 RCC
VCC
ISL6540
LIN DBOOT
CF2
RBOOT
PVCC
BOOT
HSOC
RHSOC
CHFIN
UGATE
CHSOC
Q1
PHASE
LGATE
PGND
LSOC
RLSOC
Q2
CLSOC
COMP
C1
FB
ZFB
C2
R2
CBIN
CBOOT
LOUT
CHFOUT
C3 R3
ZIN
R1
RMARG
ROFS-
OFS-
CSS
SS
GND GND
VMON
VCC
VSEN+
VSEN-
ROS
Rvmon1
RvmonOS
VOUT
CBOUT
4 FN9214.1
July 23, 2008

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ISL6540
Typical Application III (Dual Data Rate I or II)
VDDQ
1.8V or 2.5V
5V
REN1
CF1
VIN
VFF
EN
LIN
RCC
DBOOT
CF2
VCC
PVCC
BOOT
HSOC
RHSOC
REN2
CF4
1K
15nF
REFIN
REFOUT
1K DIMM
PG
CPG_DLY
PG_DLY
RFS
FS
ISL6540
UGATE
CHSOC
PHASE
LGATE
PGND
LSOC
RLSOC
COMP CLSOC
CHFIN
Q1
Q2
CBIN
CBOOT
LOUT
CHFOUT
ROFS+
MARCTRL
OFS+
RMARG
ROFS-
OFS-
CSS
SS
ZFB
C1
FB
VMON
VSEN+
C2
R2
VSEN-
C3 R3
R1 ZIN
CSEN
RFB
LINDRV GND GND
VTT
1.25V (DDR I)
0.9V (DDR II)
CBOUT
5 FN9214.1
July 23, 2008