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PM6685 Datasheet

  • PM6685

  • DUAL STEP-DOWN CONTROLLER WITH AUXILARY VOLTAGES FOR NOTEBOO...

  • 16頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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PM6685
DUAL STEP-DOWN CONTROLLER WITH AUXILARY VOLTAGES
FOR NOTEBOOK SYSTEM POWER
Preliminary Data
Features
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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
鹵
1% REFERENCE VOLTAGE
AVAILABLE
NO R
SENSE
CURRENT SENSING USING
LOW SIDE MOSFETs鈥?R
DS(on)
ACCURATE CURRENT SENSE WITH
R
SENSE
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
VFQFPN-32 5X5
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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...
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Applications
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NOTEBOOK COMPUTERS
TABLET PC OR SLATES
MOBILE SYSTEM POWER SUPPLY
3-4 CELLS Li+ BATTERY POWERED
DEVICES
Order codes
Part number
PM6685
September 2005
This is preliminary information on a new product now in development or undergoing evaluation.
Details are subject to change without notice.
Marking
PM6685
Package
VFQFPN-32 5X5
Packing
TAPE & REEL
Rev 1
1/16
www.st.com
16

PM6685 產(chǎn)品屬性

  • PM6685 View All Specifications

  • 2,940

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 控制器，筆記本電腦電源系統(tǒng)

  • 6 V ~ 28 V

  • 2

  • -3.3V，5V

  • 0°C ~ 85°C

  • 表面貼裝

  • 32-VFQFN，32-VFQFPN

  • 32-VFQFPN（5x5）

  • 托盤

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