Datasheet LT1945 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | Dual Micropower DC/DC Converter with Positive and Negative Outputs |
| Pages / Page | 8 / 8 — TYPICAL APPLICATIONS. Dual Output (±32V) Converter. Effi ciency at VIN = … |
| File Format / Size | PDF / 129 Kb |
| Document Language | English |
TYPICAL APPLICATIONS. Dual Output (±32V) Converter. Effi ciency at VIN = 3.6V. RELATED PARTS. PART NUMBER. DESCRIPTION. COMMENTS
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LT1945
TYPICAL APPLICATIONS Dual Output (±32V) Converter Effi ciency at VIN = 3.6V
C4 L1 80 0.1μF 10μH D1 VIN –32V 2.7V +32V OUTPUT 5mA 75 TO 5V 8 10 100pF 604k VIN SW1 70 –32V OUTPUT 2 1 SHDN1 NFB1 C1 65 LT1945 D2 C2 4.7μF 1μF 4 5 SHDN2 FB2 24.9k EFFICIENCY (%) 60 GND PGND PGND SW2 3 7 9 6 55 80.6k 50 0.1 1 10 C3 LOAD CURRENT (mA) 1μF 4.7pF 1945 TA02a L2 2M 10μH D3 32V 5mA 1945 TA02 C1: TAIYO YUDEN JMK212BJ475 (408)573-4150 C2, C3: TAIYO YUDEN GMK316BJ105 (408)573-4150 C4: TAIYO YUDEN UMK212BJ104 (408)573-4150 D1, D2, D3: ZETEX ZHCS400 (631)543-7100 L1, L2: MURATA LQH3C100 (814)237-1431
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
LT1613 550mA ISW, 1.4MHz, High Effi ciency Step-Up DC/DC Converter VIN = 0.9V to 10V, VOUT = 34V, IQ = 3mA, ISD = <1μA, ThinSOT Package LT1615/LT1615-1 300mA ISW, Constant Off-Time, High Effi ciency VIN = 1.2V to 15V, VOUT = 34V, IQ = 20μA, ISD = <1μA, Step-Up DC/DC Converter ThinSOT Package LT1940 Dual Output 1.4A (IOUT), Constant 1.1MHz, High Effi ciency VIN = 3V to 25V, VOUT = 1.2V, IQ = 2.5mA, ISD = <1μA, Step-Down DC/DC Converter TSSOP-16E Package LT1944 Dual Output 350mA ISW, Constant Off-Time, High Effi ciency VIN = 1.2V to 15V, VOUT = 34V, IQ = 20μA, ISD = <1μA, MS Package Step-Up DC/DC Converter LT1944-1 Dual Output 150mA ISW, Constant Off-Time, High Effi ciency VIN = 1.2V to 15V, VOUT = 34V, IQ = 20μA, ISD = <1μA, MS Package Step-Up DC/DC Converter LT1949/LT1949-1 550mA ISW, 600kHz/1.1MHz, High Effi ciency VIN = 1.5V to 12V, VOUT = 28V, IQ = 4.5mA, ISD = <25μA, Step-Up DC/DC Converter S8, MS8 Packages LTC3400/LTC3400B 600mA ISW, 1.2MHz, Synchronous Step-Up DC/DC Converter VIN = 0.85V to 5V, VOUT = 5V, IQ = 19μA/300μA, ISD = <1μA, ThinSOT Package LTC3401 1A ISW, 3MHz, Synchronous Step-Up DC/DC Converter VIN = 0.5V to 5V, VOUT = 6V, IQ = 38μA, ISD = <1μA, MS Package LTC3402 2A ISW, 3MHz, Synchronous Step-Up DC/DC Converter VIN = 0.5V to 5V, VOUT = 6V, IQ = 38μA, ISD = <1μA, MS Package LTC3423 1A ISW, 3MHz, Low VOUT, Synchronous Step-Up VIN = 0.5V to 5V, VOUT = 6V, IQ = 38μA, ISD = <1μA, MS Package DC/DC Converter LTC3424 2A ISW, 3MHz, Low VOUT, Synchronous Step-Up VIN = 0.5V to 5V, VOUT = 6V, IQ = 38μA, ISD = <1μA, MS Package DC/DC Converter 1945fa 8 Linear Technology Corporation LT 1208 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2001
TYPICAL APPLICATIONS Dual Output (±32V) Converter Effi ciency at VIN = 3.6V
C4 L1 80 0.1μF 10μH D1 VIN –32V 2.7V +32V OUTPUT 5mA 75 TO 5V 8 10 100pF 604k VIN SW1 70 –32V OUTPUT 2 1 SHDN1 NFB1 C1 65 LT1945 D2 C2 4.7μF 1μF 4 5 SHDN2 FB2 24.9k EFFICIENCY (%) 60 GND PGND PGND SW2 3 7 9 6 55 80.6k 50 0.1 1 10 C3 LOAD CURRENT (mA) 1μF 4.7pF 1945 TA02a L2 2M 10μH D3 32V 5mA 1945 TA02 C1: TAIYO YUDEN JMK212BJ475 (408)573-4150 C2, C3: TAIYO YUDEN GMK316BJ105 (408)573-4150 C4: TAIYO YUDEN UMK212BJ104 (408)573-4150 D1, D2, D3: ZETEX ZHCS400 (631)543-7100 L1, L2: MURATA LQH3C100 (814)237-1431
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS
LT1613 550mA ISW, 1.4MHz, High Effi ciency Step-Up DC/DC Converter VIN = 0.9V to 10V, VOUT = 34V, IQ = 3mA, ISD = <1μA, ThinSOT Package LT1615/LT1615-1 300mA ISW, Constant Off-Time, High Effi ciency VIN = 1.2V to 15V, VOUT = 34V, IQ = 20μA, ISD = <1μA, Step-Up DC/DC Converter ThinSOT Package LT1940 Dual Output 1.4A (IOUT), Constant 1.1MHz, High Effi ciency VIN = 3V to 25V, VOUT = 1.2V, IQ = 2.5mA, ISD = <1μA, Step-Down DC/DC Converter TSSOP-16E Package LT1944 Dual Output 350mA ISW, Constant Off-Time, High Effi ciency VIN = 1.2V to 15V, VOUT = 34V, IQ = 20μA, ISD = <1μA, MS Package Step-Up DC/DC Converter LT1944-1 Dual Output 150mA ISW, Constant Off-Time, High Effi ciency VIN = 1.2V to 15V, VOUT = 34V, IQ = 20μA, ISD = <1μA, MS Package Step-Up DC/DC Converter LT1949/LT1949-1 550mA ISW, 600kHz/1.1MHz, High Effi ciency VIN = 1.5V to 12V, VOUT = 28V, IQ = 4.5mA, ISD = <25μA, Step-Up DC/DC Converter S8, MS8 Packages LTC3400/LTC3400B 600mA ISW, 1.2MHz, Synchronous Step-Up DC/DC Converter VIN = 0.85V to 5V, VOUT = 5V, IQ = 19μA/300μA, ISD = <1μA, ThinSOT Package LTC3401 1A ISW, 3MHz, Synchronous Step-Up DC/DC Converter VIN = 0.5V to 5V, VOUT = 6V, IQ = 38μA, ISD = <1μA, MS Package LTC3402 2A ISW, 3MHz, Synchronous Step-Up DC/DC Converter VIN = 0.5V to 5V, VOUT = 6V, IQ = 38μA, ISD = <1μA, MS Package LTC3423 1A ISW, 3MHz, Low VOUT, Synchronous Step-Up VIN = 0.5V to 5V, VOUT = 6V, IQ = 38μA, ISD = <1μA, MS Package DC/DC Converter LTC3424 2A ISW, 3MHz, Low VOUT, Synchronous Step-Up VIN = 0.5V to 5V, VOUT = 6V, IQ = 38μA, ISD = <1μA, MS Package DC/DC Converter 1945fa 8 Linear Technology Corporation LT 1208 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2001
