Details, datasheet, quote on part number: LTC1144M
PartLTC1144M
CategoryPower Management => DC-DC Converters
TitleInductorless DC/DC Converters->50mA Max Output Cur
DescriptionLTC1144, 50mA Switched Capacitor Wide Input Range Voltage Conv. W/ Shutdown
CompanyLinear Technology Corporation
DatasheetDownload LTC1144M datasheet
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Features, Applications
LTC1144 Switched-Capacitor Wide Input Range Voltage Converter with Shutdown
FEATURES

Wide Operating Supply Voltage Range: to 18V Boost Pin (Pin 1) for Higher Switching Frequency Simple Conversion to 15V Supply Low Output Resistance: 120 Maximum Power Shutdown to 8A with SHDN Pin Open Circuit Voltage Conversion Efficiency: 99.9% Typical Power Conversion Efficiency: 93% Typical Easy to Use

The is a monolithic CMOS switched-capacitor voltage converter. It performs supply voltage conversion from positive to negative from an input range to 18V, resulting in complementary output voltages to 18V. Only two noncritical external capacitors are needed for the charge pump and charge reservoir functions. The converter has an internal oscillator that can be overdriven by an external clock or slowed down when connected to a capacitor. The oscillator runs a 10kHz frequency when unloaded. A higher frequency outside the audio band can also be obtained if the Boost Pin is tied to V The SHDN pin reduces supply current to 8A and can be used to save power when the converter is not in use. The LTC1144 contains an internal oscillator, divide-bytwo, voltage level shifter, and four power MOSFETs. A special logic circuit will prevent the power N-channel switch substrate from turning on.

Conversion to 15V Supplies Inexpensive Negative Supplies Data Acquisition Systems High Voltage Upgrade or 7660 Voltage Division and Multiplications Automotive Applications Battery Systems with Wall Adapter/Charger

TOP VIEW BOOST 1 CAP+ 2 GND 3 CAP V+ OSC SHDN VOUT

Supply Voltage (V (Transient).............................. 20V Supply Voltage (V (Operating)............................. 18V Input Voltage on Pins 6, 7 (Note 0.3V < VIN + 0.3V Output Short-Circuit Duration + 10V.................................................... Indefinite 15V........................................................ 30 sec + 20V............................................. Not Protected Power Dissipation............................................. 500mW Operating Temperature Range to 85C Storage Temperature Range................. to 150C Lead Temperature (Soldering, 10 sec).................. 300C

TOP VIEW BOOST 1 CAP+ 2 GND 3 CAP V+ OSC SHDN VOUT
= 15V, COSC = 25C, Test Circuit Figure 1, unless otherwise noted.

SYMBOL PARAMETER Supply Voltage Range IS Supply Current CONDITIONS = , Pins 6 No Connection, fOSC = 10kHz SHDN = , Pins 7 No Connection = , Pins 6 No Connection, fOSC = 5V, SHDN = , Pins 7 No Connection at 10kHz MIN 2 LTC1144C TYP MAX MIN 2 LTC1144I TYP MAX UNITS V mA kHz % A

at 4kHz Oscillator Frequency = 15V (Note = 5V Power Efficiency at 10kHz Voltage Conversion Efficiency RL = Oscillator Sink or Source Current = 5V (VOSC = 15V (VOSC to 15V)

The q denotes specifications which apply over the full operating temperature range; all other limits and typicals = 25C. Note 1: Absolute maximum ratings are those values beyond which the life of a device may be impaired. Note 2: Connecting any input terminal to voltages greater than + or less than ground may cause destructive latch-up. It is recommended that no

inputs from sources operating from external supplies be applied prior to power-up of the LTC1144. Note 3: fOSC is tested with COSC 100pF to minimize the effects of test fixture capacitance loading. The 0pF frequency is correlated to this 100pF test point, and is intended to simulate the capacitance at pin 7 when the device is plugged into a test socket and no external capacitor is used.

EXTERNAL CAPACITANCE (PIN 7 TO GND), COSC (pF)

Power Conversion Efficiency and Supply Current vs Load Current
= 10F BOOST = OPEN (SEE TEST CIRCUIT) LOAD CURRENT (mA)

 

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