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MFG:371 Package Cooled:ST
Part Number: PM6685
MFG: 371
Package Cooled: ST
Description: PM6685 is a dual step-down controller specifically designed to provide extremely high efficiency conve...
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PM6685
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DataSheet
General Description
PM6685 General Description
PM6685 is a dual step-down controller specifically designed to provide extremely high efficiency conversion, with lossless current sensing technique. The constant on-time architecture assures fast load transient response and the embedded voltage feed-forward provides nearly constant switching frequency operation. An embedded integrator control loop compensates the DC voltage error due to the output ripple. Pulse skipping technique increases efficiency at very light load. Moreover a minimum switching frequency of 25kHz is selectable to avoid audio noise issues. The PM6685 provides a selectable switching frequency, allowing either 200kHz/ 300kHz, 300kHz/400Khz or 400kHz/500kHz operation of the 5V/3.3V switching sections...
PM6685 Maximum Ratings
| Parameter |
Value |
Unit |
| SGND1 to SGND2 |
Shorted |
V |
| COMPx, FSEL, LDO3_SEL, VREF, SKIP to SGND1, SGND2 |
-0.3 to VCC + 0.3 |
V |
| Enx, SHDN, PGOD_LDO3, OUTx, PGOODx, VCC to SGND1, SGND2 |
-0.3 to 6 |
V |
| LDO3 to SGND1, SGND2 |
-0.3 to LDO5 + 0.3 |
V |
| LGATEx to PGND |
-0.3 to LDO5 + 0.3 |
V |
| HGATEx and BOOTx, to PHASEx |
-0.3 to 6 |
V |
| PHASEx to PGND |
-0.6 to 36 |
V |
| CSENSEx, to PGND |
-0.6 to 42 |
V |
| CSENSEx to BOOTx |
-6 to 0.3 |
V |
| V5SW, LDO5 to PGND |
-0.3 to 0.6 |
V |
| VIN to PGND |
-0.3 to 36 |
V |
| PGND to SGND1, SGND2 |
-0.3 to 0.3 |
V |
| Power dissipation at Tamb = 25°C |
2 |
W |
PM6685 Features
` CONSTANT ON TIME TOPOLOGY ALLOWS VERY FAST LOAD TRANSIENTS
` 6V TO 28V INPUT VOLTAGE RANGE
` FIXED 5V-3.3V OUTPUT VOLTAGES
` 5V AND 3.3V ALWAYS VOLTAGES AVAILABLE DELIVER 100mA PEAK CURRENT
` 1.23V ± 1% REFERENCE VOLTAGE AVAILABLE
` NO RSENSE CURRENT SENSING USING LOW SIDE MOSFETs' RDS(on)
` ACCURATE CURRENT SENSE WITH RSENSE
` NEGATIVE CURRENT LIMIT
` SOFT START INTERNALLY FIXED AT 2ms
` SOFT OFF FOR OUTPUT DISCHARGE
` LATCHED OVP AND UVP
` SELECTABLE PULSE SKIPPING AT LIGHT LOADS
` SELECTABLE MINIMUM FREQUECY (25kHz) IN PULSE SKIP MODE
` 4 mW MAXIMUM QUIESCENT POWER
` INDIPENDENT POWER GOOD SIGNALs
` OUTPUT VOLTAGE RIPPLE COMPENSATION
` 6V TO 28V INPUT VOLTAGE RANGE
` FIXED 5V-3.3V OUTPUT VOLTAGES
` 5V AND 3.3V ALWAYS VOLTAGES AVAILABLE DELIVER 100mA PEAK CURRENT
` 1.23V ± 1% REFERENCE VOLTAGE AVAILABLE
` NO RSENSE CURRENT SENSING USING LOW SIDE MOSFETs' RDS(on)
` ACCURATE CURRENT SENSE WITH RSENSE
` NEGATIVE CURRENT LIMIT
` SOFT START INTERNALLY FIXED AT 2ms
` SOFT OFF FOR OUTPUT DISCHARGE
` LATCHED OVP AND UVP
` SELECTABLE PULSE SKIPPING AT LIGHT LOADS
` SELECTABLE MINIMUM FREQUECY (25kHz) IN PULSE SKIP MODE
` 4 mW MAXIMUM QUIESCENT POWER
` INDIPENDENT POWER GOOD SIGNALs
` OUTPUT VOLTAGE RIPPLE COMPENSATION
PM6685 Typical Application
· NOTEBOOK COMPUTERS
· TABLET PC OR SLATES
· MOBILE SYSTEM POWER SUPPLY
· 3-4 CELLS Li+ BATTERY POWERED DEVICES
· TABLET PC OR SLATES
· MOBILE SYSTEM POWER SUPPLY
· 3-4 CELLS Li+ BATTERY POWERED DEVICES
PM6685 Connection Diagram
PM6685
PDF/DataSheet Download
- Datasheet: PM6685
- File Size: 910997 KB
- Manufacturer: STMICROELECTRONICS [STMicroelectronics]
- Click here to Download
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