Analog Devices Linear Technology LTM4676 Migration Manual

IntroductIon
The LTM 4676A is a pin-compatible upgrade to the
®
LTM4676. Key benefits of the LTM4676A over the
LTM4676 include:
Faster Power-Up
n
Reduced PWM Minimum On-Time
n
Faster ADC Telemetry Update
n
2
Support of I C PMBus Thresholds Compatible with
n
Bus Power Supplies as low as 1.8V
Improved Internal EEPROM Robustness
n
Wider Output Voltage Range
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More Accurate Output Setpoint Voltage
n
Feature comparIson
MFR_ADC_CONTROL for Fast ADC Sampling of a Parameter
PMBus Version
Alert Masking (a Part of 1.2 PMBus Compliant)
Shared Differential Sense Amp
Improved SYNC Circuit if Input Clock is Lost
Improved Fault Log Recording, EEPROM Robustness
Uppermost Three Bits of the Module's PMBus Address are User-Configurable
Supports PWM Burst Mode ® Operation
pIn conFIguratIon
All pins of the LTM4676A are fully compatible with the
LTM4676. In most cases, the LTM4676A will work as a
drop in replacement for the LTM4676.
L, LT, LTC, LTM, Linear Technology, Burst Mode, PolyPhase and the Linear logo are registered trademarks and LTpowerPlay is a trademark of Analog Devices, Inc. All other trademarks are the
property of their respective owners.
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Migration Guide
LTM4676 to LTM4676A
PolyPhase applications can use the differential sense
®
n
amplifier of channel 0 for improved current sharing
PolyPhase applications can clock at the desired fre-
n
quency even if the SYNC pin is not clocking.
This guide describes the differences and explains the con-
figuration file changes needed when migrating a design
from the LTM4676 to the LTM4676A.
LTM4676
1.1
✓
LTM4676A
✓
1.2
✓
✓
✓
✓
✓
4676amg
1