PM6685

Switching Frequency :
Duty Cycle (Max) :
Mounting Style : SMD/SMT
Maximum Operating Temperature : + 125 C
Number of Outputs : 2
Input Voltage : 5.5 V to 28 V
Output Current : 0.1 A
Output Voltage : 5 V, 3.3 V
Package / Case : VFQFPN EP


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


Application

· NOTEBOOK COMPUTERS
· TABLET PC OR SLATES
· MOBILE SYSTEM POWER SUPPLY
· 3-4 CELLS Li+ BATTERY POWERED DEVICES


Pinout




Specifications

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

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 of PM6685 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...

Parameters:

Technical/Catalog Information	PM6685
Vendor	STMicroelectronics
Category	Integrated Circuits (ICs)
Package / Case	32-VFQFPN
Packaging	Tray
Type	Notebook Computer Voltage Regulator
Voltage - Input	6 ~ 28 V
Voltage - Output	-3.3V, 5V
Number of Outputs	2
Applications	Controller, Notebook Power System
Operating Temperature	0°C ~ 85°C
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	PM6685 PM6685