Datasheet LTC3527, LTC3527-1 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters |
| Seiten / Seite | 22 / 1 — FEATURES. DESCRIPTION. Dual Synchronous Step-Up DC/DC Converters. … |
| Dateiformat / Größe | PDF / 373 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. Dual Synchronous Step-Up DC/DC Converters. Delivers 3.3V at 200mA/100mA from one Alkaline/
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LTC3527/LTC3527-1 Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters
FEATURES DESCRIPTION
n
Dual Synchronous Step-Up DC/DC Converters
The LTC®3527/LTC3527-1 are dual high effi ciency, step-up n
Delivers 3.3V at 200mA/100mA from one Alkaline/
DC/DC converters in a space saving 16-lead 3mm × 3mm
NiMH Cell, or 3.3V at 400mA/200mA from Two Cells
QFN package. Battery life is maximized with a 700mV start- n
VIN Start-Up Voltage: 700mV
up voltage and operation down to 500mV once started. n
0.5V to 5V VIN Range After Start-Up
The SHDN and PGOOD pins enable the converters to be n
1.6V to 5.25V VOUT Range
sequenced or started together. n
Output Disconnect in Shutdown
The LTC3527/LTC3527-1 limit inrush current during start- n
VIN > VOUT Operation
up. Selectable 1.2MHz or 2.2MHz operation provides a n
1.2MHz or 2.2MHz Operation
choice between the highest effi ciency or smallest solu- n
Up to 94% Effi ciency
tion footprint. The current mode PWM design is internally n 12μA Quiescent Current in Burst Mode® Operation compensated reducing external parts count. Burst Mode n Inrush Current Limiting and Soft-Start operation or fi xed frequency operation is selectable via the n Internal Synchronous Rectifi ers MODE pin. Anti-ring circuitry reduces EMI in discontinuous n Logic-Controlled Shutdown (< 2μA) mode. This device also features thermal shutdown. n Quick VOUT Discharge (LTC3527-1) n 16-Lead, 0.75mm × 3mm × 3mm QFN Package True output disconnect allows the output to be completely open in shutdown. The LTC3527-1 actively discharges
APPLICATIONS
VOUT1 or VOUT2 when its respective SHDN goes low. Qui- escent current in shutdown is less than 2μA. n MP3/Personal Media Players L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Noise Canceling/Bluetooth Headsets ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Wireless Mice n Portable Medical Instruments
TYPICAL APPLICATION Two-Cell Alkaline to 3.3V/1.8V Synchronous Boost Converters 1.2MHz Effi ciency and Power Loss
100 1000 1.6V to 3.2V BURST + 90 V EFFICIENCY IN 4.7μF 4.7μH 4.7μH 80 100 VIN1 VIN VIN2 POWER LOSS (mW) 70 VOUT SW1 SW2 VOUT 3.3V V 60 10 OUT1 VOUT2 1.8V 150mA 4.7μF 1.78M 15pF LTC3527 15pF 619k 150mA 50 FIXED FB1 FB2 FREQUENCY 40 1 1M PGOOD1 PGOOD2 1.21M EFFICIENCY (%) ON 30 4.7μF SHDN1 SHDN2 POWER OFF 20 0.1 MODE GND F LOSS SEL 10 VIN = 2.4V ON BURST VOUT1 = 3.3V 35271 TA01 0 0.01 OFF 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 35271 TA01b 35271fc 1
FEATURES DESCRIPTION
n
Dual Synchronous Step-Up DC/DC Converters
The LTC®3527/LTC3527-1 are dual high effi ciency, step-up n
Delivers 3.3V at 200mA/100mA from one Alkaline/
DC/DC converters in a space saving 16-lead 3mm × 3mm
NiMH Cell, or 3.3V at 400mA/200mA from Two Cells
QFN package. Battery life is maximized with a 700mV start- n
VIN Start-Up Voltage: 700mV
up voltage and operation down to 500mV once started. n
0.5V to 5V VIN Range After Start-Up
The SHDN and PGOOD pins enable the converters to be n
1.6V to 5.25V VOUT Range
sequenced or started together. n
Output Disconnect in Shutdown
The LTC3527/LTC3527-1 limit inrush current during start- n
VIN > VOUT Operation
up. Selectable 1.2MHz or 2.2MHz operation provides a n
1.2MHz or 2.2MHz Operation
choice between the highest effi ciency or smallest solu- n
Up to 94% Effi ciency
tion footprint. The current mode PWM design is internally n 12μA Quiescent Current in Burst Mode® Operation compensated reducing external parts count. Burst Mode n Inrush Current Limiting and Soft-Start operation or fi xed frequency operation is selectable via the n Internal Synchronous Rectifi ers MODE pin. Anti-ring circuitry reduces EMI in discontinuous n Logic-Controlled Shutdown (< 2μA) mode. This device also features thermal shutdown. n Quick VOUT Discharge (LTC3527-1) n 16-Lead, 0.75mm × 3mm × 3mm QFN Package True output disconnect allows the output to be completely open in shutdown. The LTC3527-1 actively discharges
APPLICATIONS
VOUT1 or VOUT2 when its respective SHDN goes low. Qui- escent current in shutdown is less than 2μA. n MP3/Personal Media Players L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Noise Canceling/Bluetooth Headsets ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Wireless Mice n Portable Medical Instruments
TYPICAL APPLICATION Two-Cell Alkaline to 3.3V/1.8V Synchronous Boost Converters 1.2MHz Effi ciency and Power Loss
100 1000 1.6V to 3.2V BURST + 90 V EFFICIENCY IN 4.7μF 4.7μH 4.7μH 80 100 VIN1 VIN VIN2 POWER LOSS (mW) 70 VOUT SW1 SW2 VOUT 3.3V V 60 10 OUT1 VOUT2 1.8V 150mA 4.7μF 1.78M 15pF LTC3527 15pF 619k 150mA 50 FIXED FB1 FB2 FREQUENCY 40 1 1M PGOOD1 PGOOD2 1.21M EFFICIENCY (%) ON 30 4.7μF SHDN1 SHDN2 POWER OFF 20 0.1 MODE GND F LOSS SEL 10 VIN = 2.4V ON BURST VOUT1 = 3.3V 35271 TA01 0 0.01 OFF 0.01 0.1 1 10 100 1000 LOAD CURRENT (mA) 35271 TA01b 35271fc 1