Datasheet LTC3458 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTIO. High Efficiency: Up to 93%. Inrush Current Limiting … |
| File Format / Size | PDF / 320 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. High Efficiency: Up to 93%. Inrush Current Limiting and Output Disconnect
Model Line for this Datasheet
Text Version of Document
LTC3458 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 93%
The LTC®3458 is a high efficiency, current mode, fixed ■
Inrush Current Limiting and Output Disconnect
frequency, step up DC/DC converter with true output ■
Programmable Output Voltages up to 7.5V
disconnect and inrush current limiting. The LTC3458 is ■
1.5V to 6V Input Range
rated for a 7.5V output and includes a 0.3Ω N-channel ■ Programmable/Synchronizable Fixed Frequency MOSFET switch and a 0.4Ω P-channel MOSFET synchro- Operation up to 1.5MHz nous rectifier. The LTC3458 is well suited for battery ■ Programmable Automatic Burst Mode® Operation powered applications and includes programmable output ■ Current Mode Control with Programmable Soft-Start voltage, switching frequency and loop compensation. The Period and Peak Current Limit oscillator frequency can be set up to 1.5MHz or synchro- ■ 700mA at 7V from 5V Input nized to an external clock. ■ 0.3Ω N-Channel and 0.4Ω P-Channel 1.4A Switches Quiescent current is only 15μA during Burst Mode opera- at 5VOUT tion maximizing battery life in portable applications. The ■ Ultralow Quiescent Currents: 15μA Sleep, <1μA in Burst Mode current threshold, peak current limit, and soft- Shutdown start are externally programmable. Other features include ■ 3mm × 4mm Thermally Enhanced DFN Package
U
<1μA shutdown current, antiringing control, and thermal
APPLICATIO S
limit. The LTC3458 is available in a low profile (0.75mm), 3mm × 4mm 12-pin DFN package. ■ Point-of-Load Regulators ■ USB VBUS Power , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ LCD Bias All other trademarks are the property of their respective owners. ■ OLED Displays Burst Mode is a registered trademark of Linear Technology Corporation.
U TYPICAL APPLICATIO USB to 7V at 1MHz
COEV 10μH DQ7545
USB to 7VOUT
100 1000 VIN SW USB 95 2.2μF LTC3458 5.25VIN 4.35V to 5.25V VOUT POWER LOSS (mW) GND/PGND VOUT 7V 90 4.35V 10pF 500mA IN 1.5M ON OFF SHDN FB 85 10 EFFICIENCY POWER LOSS SYNC COMP 80 316k 0.01μF 33k 75 RT SS 22μF 0.01μF 10pF X5R 70 0.1 ILIM BURST 0.1 1 10 100 1000 200k 124k 133k 560pF LOAD CURRENT (mA) 3458 TA01b 3458 TA01a 3458fa 1
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 93%
The LTC®3458 is a high efficiency, current mode, fixed ■
Inrush Current Limiting and Output Disconnect
frequency, step up DC/DC converter with true output ■
Programmable Output Voltages up to 7.5V
disconnect and inrush current limiting. The LTC3458 is ■
1.5V to 6V Input Range
rated for a 7.5V output and includes a 0.3Ω N-channel ■ Programmable/Synchronizable Fixed Frequency MOSFET switch and a 0.4Ω P-channel MOSFET synchro- Operation up to 1.5MHz nous rectifier. The LTC3458 is well suited for battery ■ Programmable Automatic Burst Mode® Operation powered applications and includes programmable output ■ Current Mode Control with Programmable Soft-Start voltage, switching frequency and loop compensation. The Period and Peak Current Limit oscillator frequency can be set up to 1.5MHz or synchro- ■ 700mA at 7V from 5V Input nized to an external clock. ■ 0.3Ω N-Channel and 0.4Ω P-Channel 1.4A Switches Quiescent current is only 15μA during Burst Mode opera- at 5VOUT tion maximizing battery life in portable applications. The ■ Ultralow Quiescent Currents: 15μA Sleep, <1μA in Burst Mode current threshold, peak current limit, and soft- Shutdown start are externally programmable. Other features include ■ 3mm × 4mm Thermally Enhanced DFN Package
U
<1μA shutdown current, antiringing control, and thermal
APPLICATIO S
limit. The LTC3458 is available in a low profile (0.75mm), 3mm × 4mm 12-pin DFN package. ■ Point-of-Load Regulators ■ USB VBUS Power , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. ■ LCD Bias All other trademarks are the property of their respective owners. ■ OLED Displays Burst Mode is a registered trademark of Linear Technology Corporation.
U TYPICAL APPLICATIO USB to 7V at 1MHz
COEV 10μH DQ7545
USB to 7VOUT
100 1000 VIN SW USB 95 2.2μF LTC3458 5.25VIN 4.35V to 5.25V VOUT POWER LOSS (mW) GND/PGND VOUT 7V 90 4.35V 10pF 500mA IN 1.5M ON OFF SHDN FB 85 10 EFFICIENCY POWER LOSS SYNC COMP 80 316k 0.01μF 33k 75 RT SS 22μF 0.01μF 10pF X5R 70 0.1 ILIM BURST 0.1 1 10 100 1000 200k 124k 133k 560pF LOAD CURRENT (mA) 3458 TA01b 3458 TA01a 3458fa 1
