LTC1502-3.3 Linear Technology, LTC1502-3.3 Datasheet
LTC1502-3.3
Related parts for LTC1502-3.3
LTC1502-3.3 Summary of contents
Page 1
... It requires only five small external capacitors—no inductors are required. Low supply cur- rent (40 A typical shutdown) and minimal external components make the LTC1502-3.3 ideal for space and IN power conscious single-cell applications. The total printed circuit board area of the circuit shown below is less than 2 0 ...
Page 2
... LTC1502-3 ABSOLUTE MAXIMUM V to GND .................................................. – 0. GND ............................................... – 0. OUT All Other Pins to GND ................................. – 0. Short-Circuit Duration ............................ Indefinite OUT Storage Temperature Range ................ – 150 C U PACKAGE/ORDER INFORMATION TOP VIEW OUT + + – – ...
Page 3
... OUTPUT CURRENT (mA) 1502-3.3 G05 Calculated Battery Life, Battery = 2400mA • Cell 100k 10k 1k 100 10 0.001 0.01 0 100 AVERAGE LOAD CURRENT (mA) 1502-3.3 G08 LTC1502-3.3 Output Voltage vs Output Current 3.25 3.20 0. 0.1 OUTPUT CURRENT (mA) 1502-3.3 G03 ...
Page 4
... LTC1502-3 PIN FUNCTIONS C2 (Pin 1): Charge Pump 1 (CP1) Output. This pin also serves as the input supply for charge pump 2 (CP2). To ensure proper start-up, the C2 pin must not be externally loaded. Bypass the C2 pin with low ESR capacitor to ground (Pin 2): Charge Pump 1 Flying Capacitor Positive Terminal. – ...
Page 5
... A and pull down below 0.2V to ensure proper shutdown operation, however, the actual series resistance is not critical. The pull-down device must also go into a Hi- Z state for the LTC1502-3.3 to become active. The timing control circuitry forces the CP1 switches into a high impedance state every 16 clock cycles. The Hi-Z duration is equal to one clock cycle ...
Page 6
... Since the charge pump oscillator is disabled during shutdown, output switch- ing noise can be eliminated while the external pull-down is active. The LTC1502-3.3 takes between 20 s and switch from shutdown to active mode once the pull-down device has been turned off (assuming a 100pF external – ...
Page 7
... U U APPLICATIONS INFORMATION Short-Circuit Protection When the output is shorted to ground, the LTC1502-3.3 will continuously charge the C2 capacitor up to approxi- mately 1.4 times V , and then discharge C2 into the IN shorted output. Since the discharging of C2 into V bring the C2 voltage below the COMP2 start-up compara- tor trip voltage, the output charge pump will be forced Hi-Z while C2 charges up again ...
Page 8
... C1 /SHDN 100 GND LT1521-3 150k OUT LTC1502-3 – – /SHDN GND IN 1 CELL 10 F NiCd 7 LTC1540 3. TRIP – COMMENTS 3.3V at 75mA from 1 Cell, MSOP Package 3 ...