Datasheet LT3495, LT3495B, LT3495-1, LT3495B-1 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 650mA Micropower Low Noise Boost Converter with Output Disconnect |
| Páginas / Página | 16 / 1 — FEATURES. DESCRIPTION. Low Quiescent Current. 60µA in Active Mode. 0.1µA … |
| Formato / tamaño de archivo | PDF / 647 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Low Quiescent Current. 60µA in Active Mode. 0.1µA in Shutdown Mode
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LT3495/LT3495B/ LT3495-1/LT3495B-1 650mA/350mA Micropower Low Noise Boost Converter with Output Disconnect
FEATURES DESCRIPTION
n
Low Quiescent Current
The LT®3495/LT3495B/LT3495-1/LT3495B-1 are low noise
60µA in Active Mode
boost converters with integrated power switch, feedback
0.1µA in Shutdown Mode
resistor and output disconnect circuitry. The parts control n
Low Noise Control Scheme (Switching Frequency
power delivery by varying both the peak inductor current
Always Stays Above Audible Range for LT3495/-1)
and switch off-time. This novel* control scheme results n
Integrated Power NPN:
in low output voltage ripple as well as high efficiency
650mA Current Limit (LT3495/B)
over a wide load range. For the LT3495/LT3495-1, the
350mA Current Limit (LT3495-1/B-1)
off-time of the switch is not allowed to exceed a fixed n
Integrated Output Disconnect
level, guaranteeing the switching frequency stays above n
Integrated Output Dimming
the audio band for the entire load range. The parts feature n Wide input range: 2.5V to 16V a high performance NPN power switch with a 650mA n Wide output range: Up to 40V and 350mA current limit for the LT3495/LT3495B and n Integrated feedback resistor LT3495-1/LT3495B-1 respectively. The quiescent current n Tiny 10-Lead 3mm × 2mm DFN Package is a low 60µA, which is further reduced to less than 0.1µA in shutdown. The internal disconnect circuitry allows the
APPLICATIONS
output voltage to be isolated from the input during shut- down. An auxiliary reference input (CTRL pin) overrides n OLED Power the internal 1.235V feedback reference with any lower n Low Noise Power value allowing full control of the output voltage during n MP3 Player operation. The LT3495 series are available in a tiny 10-lead L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. 3mm × 2mm DFN package. All other trademarks are the property of their respective owners. *Patent pending.
TYPICAL APPLICATION Output Voltage Ripple OLED Power Supply from One Li-Ion Cell vs Load Current Efficiency vs Load Current
50 90 400 10µH ONE VIN = 3.6V Li-Ion LOAD FROM CAP 1.0µF 0603 CELL 4.7µF 2.2µF 40 CAPACITOR AT VOUT 80 LOAD FROM V 320 SW CAP OUT V POWER LOSS (mW) OUT VCC VOUT 16V 70mA 30 70 240 LT3495 909k SHDN FB 1µF 20 CTRL GND 60 160 EFFICIENCY (%) 3495 TA01a PEAK-TO-PEAK RIPPLE (mV) 10 50 80 V OUT 2.2µF 1206 CAPACITOR AT VOUT 0 40 0 0.1 1 10 100 0.1 1 10 100 LOAD CURRENT (mA) LOAD CURRENT (mA) 3495 TA01b 3495 TA01c 3495b1b1fa 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Infomation Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
Low Quiescent Current
The LT®3495/LT3495B/LT3495-1/LT3495B-1 are low noise
60µA in Active Mode
boost converters with integrated power switch, feedback
0.1µA in Shutdown Mode
resistor and output disconnect circuitry. The parts control n
Low Noise Control Scheme (Switching Frequency
power delivery by varying both the peak inductor current
Always Stays Above Audible Range for LT3495/-1)
and switch off-time. This novel* control scheme results n
Integrated Power NPN:
in low output voltage ripple as well as high efficiency
650mA Current Limit (LT3495/B)
over a wide load range. For the LT3495/LT3495-1, the
350mA Current Limit (LT3495-1/B-1)
off-time of the switch is not allowed to exceed a fixed n
Integrated Output Disconnect
level, guaranteeing the switching frequency stays above n
Integrated Output Dimming
the audio band for the entire load range. The parts feature n Wide input range: 2.5V to 16V a high performance NPN power switch with a 650mA n Wide output range: Up to 40V and 350mA current limit for the LT3495/LT3495B and n Integrated feedback resistor LT3495-1/LT3495B-1 respectively. The quiescent current n Tiny 10-Lead 3mm × 2mm DFN Package is a low 60µA, which is further reduced to less than 0.1µA in shutdown. The internal disconnect circuitry allows the
APPLICATIONS
output voltage to be isolated from the input during shut- down. An auxiliary reference input (CTRL pin) overrides n OLED Power the internal 1.235V feedback reference with any lower n Low Noise Power value allowing full control of the output voltage during n MP3 Player operation. The LT3495 series are available in a tiny 10-lead L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. 3mm × 2mm DFN package. All other trademarks are the property of their respective owners. *Patent pending.
TYPICAL APPLICATION Output Voltage Ripple OLED Power Supply from One Li-Ion Cell vs Load Current Efficiency vs Load Current
50 90 400 10µH ONE VIN = 3.6V Li-Ion LOAD FROM CAP 1.0µF 0603 CELL 4.7µF 2.2µF 40 CAPACITOR AT VOUT 80 LOAD FROM V 320 SW CAP OUT V POWER LOSS (mW) OUT VCC VOUT 16V 70mA 30 70 240 LT3495 909k SHDN FB 1µF 20 CTRL GND 60 160 EFFICIENCY (%) 3495 TA01a PEAK-TO-PEAK RIPPLE (mV) 10 50 80 V OUT 2.2µF 1206 CAPACITOR AT VOUT 0 40 0 0.1 1 10 100 0.1 1 10 100 LOAD CURRENT (mA) LOAD CURRENT (mA) 3495 TA01b 3495 TA01c 3495b1b1fa 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Infomation Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts