ISL6227EVAL2Z

ISL6227EVAL2Z Datasheet

ISL6227EVAL2Z Dual Switcher Evaluation Board

Part	Datasheet
ISL6227EVAL2Z	ISL6227EVAL2Z (pdf)

Related Parts	Information
ISL6227EVAL2	ISL6227EVAL2

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ISL6227EVAL2Z Dual Switcher Evaluation Board Setup Procedure Application Note July 14, 2008 AN1068.1 This document describes the setup procedure for the ISL6227 Evaluation Board dual switcher implementation. For information about the DDR application, please refer to Application Note 1067, “ISL6227EVAL1 DDR Evaluation Board Setup Procedure.” The ISL6227 can control two output voltages adjustable from 0.9V to 5.5V. The ISL6227 combines two synchronous PWM voltage regulators into a single IC. When the DDR pin is set to high, it transforms the IC into a complete dual switcher application. PWM1 and PWM2 output voltages are set by a simple feedback voltage divider connected across the outputs to GND. The feedback voltage divider outputs are 0.9VDC, which are connected to the VSEN1 and VSEN2 pins. Automatic mode selection of constant-frequency synchronous rectification at heavy load, and hysteretic diode-emulation at light load, assure high efficiency over a wide range of conditions. The hysteretic mode of operation can be disabled separately on each PWM converter if constant-frequency continuous-conduction operation is desired for all load levels. The mode selection is achieved through the VOUT1 and VOUT2 pin connection. When VOUTx connects to GND, it forces Continuous Current Mode CCM operation. When they are connected to their respective outputs, it commands auto mode. Efficiency is further enhanced by using the lower MOSFET rDS ON as the current sense element. Voltage-feed-forward ramp modulation VIN pin , current mode control, and internal feedback compensation provide fast response to input voltage and output load transients. In dual switching power supply applications, the ISL6227 monitors the output voltage of both CH1 and CH2 by comparing VSEN pin voltage to internal references. An independent PGOOD power good signal is asserted for each channel after its soft-start sequence has completed, and the output voltage is within -11%/+15% of the set point. The soft-start time can be adjusted through the selection of soft-start capacitors. VSEN pin voltage is also used for overvoltage and undervoltage protections. The overvoltage protection prevents the output from going above 115% of the set point by holding the lower MOSFET on and the upper MOSFET off. When the output voltage decays below the overvoltage threshold, normal operation automatically resumes. Once the soft-start sequence has completed, undervoltage protection will latch the channel off if the output drops below 75% of its set point value in case of a short circuit. Adjustable overcurrent protection OCP monitors the voltage drop across the rDS ON of the lower MOSFET. The overcurrent protection threshold level can be adjusted by the resistor from OCSET pin to ground. The current sensing gain can be adjusted through the ISEN pin resistor. If more precise current-sensing is required, an external current sense resistor may be used. • Provides regulated output voltage in the range of 0.9V to 5.5V - High efficiency over wide load range - Synchronous buck converter with hysteretic operation at light load - Inhibit hysteretic mode on one, or both channels • Uses MOSFET rDS ON for current sensing or uses current-sense resistor for precision overcurrent protection • Overvoltage, undervoltage and overcurrent protection on both channels • Undervoltage lock-out on VCC pin • Dual input voltage mode operation - Operates directly from battery 5V to 24V input - Operates from 3.3V or 5V system rail • Excellent dynamic response - Combined voltage feed-forward and current mode control • Power-good signal for each channel • 300kHz switching frequency - 180° channel-to-channel phase shift operation • Pb-free available RoHS compliant 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. 2004, All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1068 Ordering Information PART MARKING TEMP. RANGE °C PACKAGE PKG. DWG. # ISL6227CA* ISL 6227CA -10 to +100 28 Ld QSOP M28.15 ISL6227CAZ* Note ISL 6227CAZ -10 to +100 28 Ld QSOP Pb-free M28.15 ISL6227IA* ISL 6227IA -40 to +100 28 Ld QSOP M28.15 ISL6227IAZ* Note ISL 6227IAZ -40 to +100 28 Ld QSOP Pb-free M28.15 ISL6227IRZ* Note ISL 6227IRZ -10 to +100 28 Ld QFN Pb-free L28.5x5 ISL6227HRZ* Note ISL 6227HRZ -10 to +100 28 Ld QFN Pb-free L28.5x5 ISL6227EVAL2Z Evaluation Platform *Add “-T” suffix for tape and reel. 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. Pinouts ISL6227 28 LD QSOP

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ISL6227EVAL2Z Dual Switcher Evaluation Board

Setup Procedure

Application Note

July 14, 2008

AN1068.1

This document describes the setup procedure for the ISL6227 Evaluation Board dual switcher implementation. For information about the DDR application, please refer to Application Note 1067, “ISL6227EVAL1 DDR Evaluation Board Setup Procedure.”

The ISL6227 can control two output voltages adjustable from 0.9V to 5.5V. The ISL6227 combines two synchronous PWM voltage regulators into a single IC. When the DDR pin is set to high, it transforms the IC into a complete dual switcher application. PWM1 and PWM2 output voltages are set by a simple feedback voltage divider connected across the outputs to GND. The feedback voltage divider outputs are 0.9VDC, which are connected to the VSEN1 and VSEN2 pins.

Automatic mode selection of constant-frequency synchronous rectification at heavy load, and hysteretic diode-emulation at light load, assure high efficiency over a wide range of conditions. The hysteretic mode of operation can be disabled separately on each PWM converter if constant-frequency continuous-conduction operation is desired for all load levels. The mode selection is achieved through the VOUT1 and VOUT2 pin connection. When VOUTx connects to GND, it forces Continuous Current Mode CCM operation. When they are connected to their respective outputs, it commands auto mode. Efficiency is further enhanced by using the lower MOSFET rDS ON as the current sense element.

Voltage-feed-forward ramp modulation VIN pin , current mode control, and internal feedback compensation provide fast response to input voltage and output load transients.

In dual switching power supply applications, the ISL6227 monitors the output voltage of both CH1 and CH2 by comparing VSEN pin voltage to internal references. An independent PGOOD power good signal is asserted for each channel after its soft-start sequence has completed, and the output voltage is within -11%/+15% of the set point. The soft-start time can be adjusted through the selection of soft-start capacitors.

VSEN pin voltage is also used for overvoltage and undervoltage protections. The overvoltage protection prevents the output from going above 115% of the set point by holding the lower MOSFET on and the upper MOSFET off. When the output voltage decays below the overvoltage threshold, normal operation automatically resumes. Once the soft-start sequence has completed, undervoltage protection will latch the channel off if the output drops below 75% of its set point value in case of a short circuit.

Adjustable overcurrent protection OCP monitors the voltage drop across the rDS ON of the lower MOSFET. The overcurrent protection threshold level can be adjusted by the resistor from OCSET pin to ground. The current sensing gain can be adjusted through the ISEN pin resistor. If more precise current-sensing is required, an external current sense resistor may be used.
• Provides regulated output voltage in the range of 0.9V to 5.5V - High efficiency over wide load range - Synchronous buck converter with hysteretic operation at light load - Inhibit hysteretic mode on one, or both channels
• Uses MOSFET rDS ON for current sensing or uses current-sense resistor for precision overcurrent protection
• Overvoltage, undervoltage and overcurrent protection on both channels
• Undervoltage lock-out on VCC pin
• Dual input voltage mode operation - Operates directly from battery 5V to 24V input - Operates from 3.3V or 5V system rail
• Excellent dynamic response - Combined voltage feed-forward and current mode control
• Power-good signal for each channel
• 300kHz switching frequency - 180° channel-to-channel phase shift operation
• Pb-free available RoHS compliant

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. 2004, All Rights Reserved

All other trademarks mentioned are the property of their respective owners.

Application Note 1068
Ordering Information

PART MARKING

TEMP. RANGE °C

PACKAGE

PKG. DWG. #

ISL6227CA*

ISL 6227CA
-10 to +100
28 Ld QSOP

M28.15

ISL6227CAZ* Note

ISL 6227CAZ
-10 to +100
28 Ld QSOP Pb-free

M28.15

ISL6227IA*

ISL 6227IA
-40 to +100
28 Ld QSOP

M28.15

ISL6227IAZ* Note

ISL 6227IAZ
-40 to +100
28 Ld QSOP Pb-free

M28.15

ISL6227IRZ* Note

ISL 6227IRZ
-10 to +100
28 Ld QFN Pb-free

L28.5x5

ISL6227HRZ* Note

ISL 6227HRZ
-10 to +100
28 Ld QFN Pb-free

L28.5x5

ISL6227EVAL2Z

Evaluation Platform
*Add “-T” suffix for tape and reel. 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.

Pinouts

ISL6227 28 LD QSOP

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Datasheet ID: ISL6227EVAL2Z 639168