LTC1515 LINER [Linear Technology], LTC1515 Datasheet
LTC1515
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LTC1515 Summary of contents
Page 1
... The LTC micropower switched capacitor DC/DC converters that produce a regulated output voltage by either stepping up or stepping down the input voltage. Output voltage is adjustable using an external resistor divider (LTC1515) or programmable to either 3V/5V (LTC1515-3/5) or 3.3V/5V (LTC1515-3.3/5) using a logic pin. A unique architecture allows the parts to accommodate a IN wide input voltage range (2V to 10V) while maintaining 4% regulation ...
Page 2
... Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS 10V, SHDN = 3V 0. PARAMETER V Operating Voltage (LTC1515-3/5) OUT V = 3.3V (LTC1515-3.3/5) OUT (LTC1515-3/5, LTC1515-3.3/5) OUT V Feedback Voltage FB V Feedback Hysteresis FB Effective Output Resistance V Operating Current IN V Shutdown Current IN Output Ripple Switching Frequency ...
Page 3
... INPUT VOLTAGE (V) 1515 G05 LTC1515 Series MIN TYP MAX – – 10 – 7.5 – 140 200 280 8V OUT LTC1515-X 3.3V Output Voltage Ripple vs Input Voltage 250 V = 3.3V OUT I = 10mA OUT 200 A 150 OUT C OUT 100 50 C OUT ...
Page 4
... As with the SHDN pin, the 5/3 pin may be driven with SHDN voltages, the SHDN 3V logic over the entire (LTC1515) (Pin 3): Feedback Input. The voltage on this pin is compared to the internal reference voltage (1.232V) to keep the output in regulation. An external resistor divider is required between V voltage. Total divider resistance should not exceed 2M. ...
Page 5
... U U APPLICATIONS INFORMATION Regulator Operation The regulator section of the LTC1515, LTC1515-3/5 and LTC1515-3.3/5 consists of a charge pump, reference, comparator and some logic. The divided down output voltage is compared to the internal reference voltage. When the divided output drops below the reference volt- age, the charge pump is enabled, which boosts the output back into regulation ...
Page 6
... A logic high on this pin produces a 5V output and a low produces either a 3V output or a 3.3V output. The output voltage of the LTC1515 is selected using an external resistor divider (see Figure 1). The output voltage is determined using the following formula ...
Page 7
... This may disrupt input supply regulation, especially if the input supply is a low power DC/DC converter or linear regulator. The LTC1515 family minimizes inrush currents both at start-up and under high V per charging cycle. Internal soft start circuitry controls the rate at which V may be charged from 0V to its final regulated value ...
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... SO8 0996 50mA OUT 2V 50mA (V 3V) IN OUT IN = 20mA OUT 1515f LT/TP 0298 4K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1997 = 5V = 20mA < 1mV P-P LTC1515 • TA03 ...