Datasheet LTC3528, LTC3528B (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm x 2mm DFN |
| Pages / Page | 18 / 1 — FEATURES. DESCRIPTION. Delivers 3.3V at 200mA from a Single Alkaline/. … |
| File Format / Size | PDF / 340 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Delivers 3.3V at 200mA from a Single Alkaline/. NiMH Cell or 3.3V at 400mA from Two Cells
Model Line for this Datasheet
Text Version of Document
LTC3528/LTC3528B 1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm × 2mm DFN
FEATURES DESCRIPTION
■
Delivers 3.3V at 200mA from a Single Alkaline/
The LTC®3528/LTC3528B are synchronous, fixed frequency
NiMH Cell or 3.3V at 400mA from Two Cells
step-up DC/DC converters with output disconnect. High ■
VIN Start-Up Voltage: 700mV
efficiency synchronous rectification, in addition to a 700mV ■
1.6V to 5.25V VOUT Range
start-up voltage and operation down to 500mV once ■
Up to 94% Efficiency
started, provides longer run time for single or multiple ■
Output Disconnect
cell battery-powered products. ■
1MHz Fixed Frequency Operation
A switching frequency of 1MHz minimizes solution ■
VIN > VOUT Operation
footprint by allowing the use of tiny, low profile induc- ■
Integrated Soft-Start
tors and ceramic capacitors. The current mode PWM is ■ Current Mode Control with Internal Compensation internally compensated, simplifying the design process. ■ Burst Mode® Operation with 12µA Quiescent Current The LTC3528 enters Burst Mode operation at light loads, (LTC3528) while the LTC3528B features continuous switching at light ■ Low Noise PWM Operation (LTC3528B) loads. Anti-ringing circuitry reduces EMI by damping the ■ Internal Synchronous Rectifier inductor in discontinuous mode. Additional features include ■ Logic Controlled Shutdown: <1µA a low shutdown current, open-drain power good output, ■ Anti-Ringing Control short-circuit protection and thermal overload protection. ■ Low Profile (3mm × 2mm × 0.75mm) DFN Package The LTC3528/LTC3528B are offered in an 8-lead 3mm ×
APPLICATIONS
2mm × 0.75mm DFN package. ■ Medical Instruments L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks ■ Flash-Based MP3 Players are the property of their respective owners. ■ Noise Canceling Headphones ■ Wireless Mice ■ Bluetooth Headsets
TYPICAL APPLICATION Efficiency and Power Loss
100 1000 VOUT = 3.3V 4.7µH V 90 IN = 2.4V 100 POWER LOSS (mW) SW 80 V VOUT IN EFFICIENCY VIN VOUT 1.8V TO 3.2V 3.3V 10 400mA 70 4.7µF 499k 33pF LTC3528 PGOOD FB 10µF 60 1 EFFICIENCY (%) POWER LOSS OFF ON SHDN 287k 50 GND 0.1 40 3528 TA01a 30 0.01 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 3528 TA01b 3528fd 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts
FEATURES DESCRIPTION
■
Delivers 3.3V at 200mA from a Single Alkaline/
The LTC®3528/LTC3528B are synchronous, fixed frequency
NiMH Cell or 3.3V at 400mA from Two Cells
step-up DC/DC converters with output disconnect. High ■
VIN Start-Up Voltage: 700mV
efficiency synchronous rectification, in addition to a 700mV ■
1.6V to 5.25V VOUT Range
start-up voltage and operation down to 500mV once ■
Up to 94% Efficiency
started, provides longer run time for single or multiple ■
Output Disconnect
cell battery-powered products. ■
1MHz Fixed Frequency Operation
A switching frequency of 1MHz minimizes solution ■
VIN > VOUT Operation
footprint by allowing the use of tiny, low profile induc- ■
Integrated Soft-Start
tors and ceramic capacitors. The current mode PWM is ■ Current Mode Control with Internal Compensation internally compensated, simplifying the design process. ■ Burst Mode® Operation with 12µA Quiescent Current The LTC3528 enters Burst Mode operation at light loads, (LTC3528) while the LTC3528B features continuous switching at light ■ Low Noise PWM Operation (LTC3528B) loads. Anti-ringing circuitry reduces EMI by damping the ■ Internal Synchronous Rectifier inductor in discontinuous mode. Additional features include ■ Logic Controlled Shutdown: <1µA a low shutdown current, open-drain power good output, ■ Anti-Ringing Control short-circuit protection and thermal overload protection. ■ Low Profile (3mm × 2mm × 0.75mm) DFN Package The LTC3528/LTC3528B are offered in an 8-lead 3mm ×
APPLICATIONS
2mm × 0.75mm DFN package. ■ Medical Instruments L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks ■ Flash-Based MP3 Players are the property of their respective owners. ■ Noise Canceling Headphones ■ Wireless Mice ■ Bluetooth Headsets
TYPICAL APPLICATION Efficiency and Power Loss
100 1000 VOUT = 3.3V 4.7µH V 90 IN = 2.4V 100 POWER LOSS (mW) SW 80 V VOUT IN EFFICIENCY VIN VOUT 1.8V TO 3.2V 3.3V 10 400mA 70 4.7µF 499k 33pF LTC3528 PGOOD FB 10µF 60 1 EFFICIENCY (%) POWER LOSS OFF ON SHDN 287k 50 GND 0.1 40 3528 TA01a 30 0.01 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 3528 TA01b 3528fd 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts
