Datasheet LTC3528-2 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 1A, 2MHz Synchronous Step-Up DC/DC Converter in 2mm × 3mm DFN |
| Páginas / Página | 18 / 1 — FEATURES. DESCRIPTION. Delivers 3.3V at 200mA from a Single Alkaline/. … |
| Formato / tamaño de archivo | PDF / 406 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Delivers 3.3V at 200mA from a Single Alkaline/. NiMH Cell or 3.3V at 400mA from Two Cells
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LTC3528-2 1A, 2MHz Synchronous Step-Up DC/DC Converter in 2mm × 3mm DFN
FEATURES DESCRIPTION
n
Delivers 3.3V at 200mA from a Single Alkaline/
The LTC®3528-2 is a synchronous, fixed frequency step-up
NiMH Cell or 3.3V at 400mA from Two Cells
DC/DC converter with output disconnect. High efficiency n
VIN Start-Up Voltage: 700mV
synchronous rectification, in addition to a 700mV start- n
0.50V to 5.5V Input Range
up voltage and operation down to 500mV once started, n
1.6V to 5.25V VOUT Range
provides longer run-time for single or multiple cell battery- n
Up to 94% Efficiency
powered products. n
Output Disconnect
A switching frequency of 2MHz minimizes solution foot- n
2MHz Fixed Frequency Operation
print by allowing the use of tiny, low profile inductors n
VIN > VOUT Operation
and ceramic capacitors. The current mode PWM is inter- n
Integrated Soft-Start
nally compensated, simplifying the design process. The n Current Mode Control with Internal Compensation LTC3528-2 enters Burst Mode operation at light loads. n Burst Mode® Operation with 12µA Quiescent Current Anti-ringing circuitry reduces EMI by damping the induc- n Internal Synchronous Rectifier tor in discontinuous mode. Additional features include a n Logic Controlled Shutdown: <1µA low shutdown current, open-drain power good output, n Anti-Ringing Control short-circuit protection and thermal overload protection. n Low Profile (2mm × 3mm × 0.75mm) DFN Package The LTC3528-2 is offered in an 8-lead 2mm × 3mm ×
APPLICATIONS
0.75mm DFN package. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks n Medical Instruments and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the n Noise Canceling Headphones property of their respective owners. n Wireless Mice n Bluetooth Headsets
TYPICAL APPLICATION Efficiency and Power Loss
100 1000 VOUT = 3.3V 2.2µH 90 VIN = 2.4V 80 100 EFFICIENCY POWER LOSS (mW) SW 70 V VOUT IN VIN VOUT 3.3V 60 10 1.8V TO 3.2V 400mA 4.7µF 499k 68pF LTC3528-2 50 PGOOD FB 10µF 40 1 EFFICIENCY (%) POWER LOSS OFF ON SHDN 30 287k GND 20 0.1 35282 TA01a 10 0 0.01 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 35282 TA01b 35282fb 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
n
Delivers 3.3V at 200mA from a Single Alkaline/
The LTC®3528-2 is a synchronous, fixed frequency step-up
NiMH Cell or 3.3V at 400mA from Two Cells
DC/DC converter with output disconnect. High efficiency n
VIN Start-Up Voltage: 700mV
synchronous rectification, in addition to a 700mV start- n
0.50V to 5.5V Input Range
up voltage and operation down to 500mV once started, n
1.6V to 5.25V VOUT Range
provides longer run-time for single or multiple cell battery- n
Up to 94% Efficiency
powered products. n
Output Disconnect
A switching frequency of 2MHz minimizes solution foot- n
2MHz Fixed Frequency Operation
print by allowing the use of tiny, low profile inductors n
VIN > VOUT Operation
and ceramic capacitors. The current mode PWM is inter- n
Integrated Soft-Start
nally compensated, simplifying the design process. The n Current Mode Control with Internal Compensation LTC3528-2 enters Burst Mode operation at light loads. n Burst Mode® Operation with 12µA Quiescent Current Anti-ringing circuitry reduces EMI by damping the induc- n Internal Synchronous Rectifier tor in discontinuous mode. Additional features include a n Logic Controlled Shutdown: <1µA low shutdown current, open-drain power good output, n Anti-Ringing Control short-circuit protection and thermal overload protection. n Low Profile (2mm × 3mm × 0.75mm) DFN Package The LTC3528-2 is offered in an 8-lead 2mm × 3mm ×
APPLICATIONS
0.75mm DFN package. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks n Medical Instruments and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the n Noise Canceling Headphones property of their respective owners. n Wireless Mice n Bluetooth Headsets
TYPICAL APPLICATION Efficiency and Power Loss
100 1000 VOUT = 3.3V 2.2µH 90 VIN = 2.4V 80 100 EFFICIENCY POWER LOSS (mW) SW 70 V VOUT IN VIN VOUT 3.3V 60 10 1.8V TO 3.2V 400mA 4.7µF 499k 68pF LTC3528-2 50 PGOOD FB 10µF 40 1 EFFICIENCY (%) POWER LOSS OFF ON SHDN 30 287k GND 20 0.1 35282 TA01a 10 0 0.01 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 35282 TA01b 35282fb 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