Back to browse
LTC3553
Micropower USB Power Manager With Li-Ion Charger, LDO and Buck Regulator, 4.2V float, QFN-20
Schematic Symbol
Pin Configuration (21 pins)
| Pin | Name | Type |
|---|---|---|
| 1 | HPWR | input |
| 2 | SEQ | input |
| 3 | PBSTAT | output |
| 4 | ~{ON} | input |
| 5 | LDO_ON | input |
| 6 | STBY | input |
| 7 | BUCK_ON | input |
| 8 | BUCK_FB | input |
| 9 | LDO_FB | input |
| 10 | LDO | power_out |
| 11 | VINLDO | power_in |
| 12 | BVIN | power_in |
| 13 | SW | power_out |
| 14 | ~{CHRG} | open_collector |
| 15 | NTC | passive |
| 16 | PROG | passive |
| 17 | BAT | power_out |
| 18 | VOUT | power_out |
| 19 | SUSP | input |
| 20 | VBUS | power_in |
| 21 | GND | power_in |
Footprint
ConfirmedPackage_DFN_QFN/QFN-20-1EP_3x3mm_P0.4mm_EP1.65x1.65mm
Pad Layout
Pads (25)
| Number | Type |
|---|---|
| — | smd |
| — | smd |
| — | smd |
| — | smd |
| 1 | smd |
| 2 | smd |
| 3 | smd |
| 4 | smd |
| 5 | smd |
| 6 | smd |
| 7 | smd |
| 8 | smd |
| 9 | smd |
| 10 | smd |
| 11 | smd |
| 12 | smd |
| 13 | smd |
| 14 | smd |
| 15 | smd |
| 16 | smd |
| 17 | smd |
| 18 | smd |
| 19 | smd |
| 20 | smd |
| 21 | smd |