Datasheet LTM4691 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Low VIN, High Efficiency, Dual 2A Step-Down DC/DC µModule Regulator |
| Pages / Page | 22 / 1 — FEATURES. DESCRIPTION. Tiny Surface Mount, Low Profile 3mm × 4mm ×. … |
| File Format / Size | PDF / 1.2 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. Tiny Surface Mount, Low Profile 3mm × 4mm ×. 1.18mm LGA Package. APPLICATIONS. TYPICAL APPLICATION
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LTM4691 Low VIN, High Efficiency, Dual 2A Step-Down DC/DC µModule Regulator
FEATURES DESCRIPTION
n
Tiny Surface Mount, Low Profile 3mm × 4mm ×
The LTM®4691 is a complete dual 2A output switch-
1.18mm LGA Package
ing mode DC/DC power supply in a tiny 3mm × 4mm n Input Voltage Range: 2.25V to 3.6V × 1.18mm LGA package. Included in the package are n Dual 2A DC Output Current the switching control er, power FETs, inductors and al n ±1.5% Total Output Voltage Regulation supporting components. Operating over an input voltage n Current Mode Control, Fast Transient Response range of 2.25V to 3.6V, the LTM4691 supports two out- n External Frequency Synchronization puts with programmable output voltage range from 0.5V n 180° Out-of-Phase Operation to 2.5V set by external resistors. Its high efficiency design n Selectable Pulse-Skipping Mode/Burst Mode® delivers up to 2A continuous current on each output. Only Operation/Forced Continuous Mode bulk input and output capacitors are needed. n Power Good Indicator The LTM4691 operates in forced continuous mode for low n Internal Soft-Start noise pulse-skipping mode or Burst Mode operation for n Internal Compensation high efficiency at lights loads. The typical buck switching n Overvoltage, Overcurrent and Overtemperature frequency is 2MHz and can be synchronized from 1MHz to Protection 3MHz. Its high switching frequency and a current mode architecture enables a very fast transient response to line
APPLICATIONS
and load changes without sacrificing stability. n Other features include precision run thresholds, a PGOOD Telecom, Networking and Industrial Equipment n signal, output overvoltage protection, thermal shutdown Point-of-Load Regulation n and output short-circuit protection. The LTM4691 is FPGA, ASIC Core Supplies Pb-free and RoHS compliant. All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION Dual 2A DC/DC μModule Regulator Efficiency vs Load Current
V 100 0.6 IN V VOUT1 IN VOUT1 EFFICIENCY 2.25V TO 3.6V 1.2V, 2A 90 10µF 140k 2.7pF 0.5 80 22µF FB1 POWER LOSS (W) 70 RUN1 Burst Mode OPERATION 0.4 100k LTM4691 60 VIN = 3.3V, VOUT = 1.8V VIN fSW = 2MHz 50 CH1 OFF 0.3 10µF V VOUT2 OUT2 1.8V, 2A 40 261k 1.2pF EFFICIENCY (%) 0.2 RUN2 22µF 30 MODE/SYNC FB2 20 0.1 PGOOD 100k GND 10 POWER LOSS 4691 TA01a fSW = 2MHz 0 0 0.001 0.01 0.1 1 10 LOAD CURRENT (A) 4691 TA01b Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information VIN to VOUT Step-Down Ratios Output Voltage Programming Input Decoupling Capacitors Output Decoupling Capacitors Mode Selection Operating Frequency and External Synchronization Power GOOD Output Overvoltage Protection Output Voltage Soft-Start Dropout Operation Output Short-Circuit Protection and Recovery Load Sharing Using the Precision RUN Threshold Thermal Considerations and Output Current Derating Safety Considerations Layout Checklist/Example Applications Information Typical Applications Pin Configuration Table LTM4691 Component LGA Pinout Package Description Package Photo Related Parts
FEATURES DESCRIPTION
n
Tiny Surface Mount, Low Profile 3mm × 4mm ×
The LTM®4691 is a complete dual 2A output switch-
1.18mm LGA Package
ing mode DC/DC power supply in a tiny 3mm × 4mm n Input Voltage Range: 2.25V to 3.6V × 1.18mm LGA package. Included in the package are n Dual 2A DC Output Current the switching control er, power FETs, inductors and al n ±1.5% Total Output Voltage Regulation supporting components. Operating over an input voltage n Current Mode Control, Fast Transient Response range of 2.25V to 3.6V, the LTM4691 supports two out- n External Frequency Synchronization puts with programmable output voltage range from 0.5V n 180° Out-of-Phase Operation to 2.5V set by external resistors. Its high efficiency design n Selectable Pulse-Skipping Mode/Burst Mode® delivers up to 2A continuous current on each output. Only Operation/Forced Continuous Mode bulk input and output capacitors are needed. n Power Good Indicator The LTM4691 operates in forced continuous mode for low n Internal Soft-Start noise pulse-skipping mode or Burst Mode operation for n Internal Compensation high efficiency at lights loads. The typical buck switching n Overvoltage, Overcurrent and Overtemperature frequency is 2MHz and can be synchronized from 1MHz to Protection 3MHz. Its high switching frequency and a current mode architecture enables a very fast transient response to line
APPLICATIONS
and load changes without sacrificing stability. n Other features include precision run thresholds, a PGOOD Telecom, Networking and Industrial Equipment n signal, output overvoltage protection, thermal shutdown Point-of-Load Regulation n and output short-circuit protection. The LTM4691 is FPGA, ASIC Core Supplies Pb-free and RoHS compliant. All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION Dual 2A DC/DC μModule Regulator Efficiency vs Load Current
V 100 0.6 IN V VOUT1 IN VOUT1 EFFICIENCY 2.25V TO 3.6V 1.2V, 2A 90 10µF 140k 2.7pF 0.5 80 22µF FB1 POWER LOSS (W) 70 RUN1 Burst Mode OPERATION 0.4 100k LTM4691 60 VIN = 3.3V, VOUT = 1.8V VIN fSW = 2MHz 50 CH1 OFF 0.3 10µF V VOUT2 OUT2 1.8V, 2A 40 261k 1.2pF EFFICIENCY (%) 0.2 RUN2 22µF 30 MODE/SYNC FB2 20 0.1 PGOOD 100k GND 10 POWER LOSS 4691 TA01a fSW = 2MHz 0 0 0.001 0.01 0.1 1 10 LOAD CURRENT (A) 4691 TA01b Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information VIN to VOUT Step-Down Ratios Output Voltage Programming Input Decoupling Capacitors Output Decoupling Capacitors Mode Selection Operating Frequency and External Synchronization Power GOOD Output Overvoltage Protection Output Voltage Soft-Start Dropout Operation Output Short-Circuit Protection and Recovery Load Sharing Using the Precision RUN Threshold Thermal Considerations and Output Current Derating Safety Considerations Layout Checklist/Example Applications Information Typical Applications Pin Configuration Table LTM4691 Component LGA Pinout Package Description Package Photo Related Parts
