Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

ACT8870QJ-T Folha de dados(PDF) 26 Page - Active-Semi, Inc

Nome de Peças ACT8870QJ-T
Descrição Electrónicos  Advanced PMU for Microcontrollers and Solid State Drive Applications
Download  43 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  ACTIVE-SEMI [Active-Semi, Inc]
Página de início  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT8870QJ-T Folha de dados(HTML) 26 Page - Active-Semi, Inc

Back Button ACT8870QJ-T Datasheet HTML 22Page - Active-Semi, Inc ACT8870QJ-T Datasheet HTML 23Page - Active-Semi, Inc ACT8870QJ-T Datasheet HTML 24Page - Active-Semi, Inc ACT8870QJ-T Datasheet HTML 25Page - Active-Semi, Inc ACT8870QJ-T Datasheet HTML 26Page - Active-Semi, Inc ACT8870QJ-T Datasheet HTML 27Page - Active-Semi, Inc ACT8870QJ-T Datasheet HTML 28Page - Active-Semi, Inc ACT8870QJ-T Datasheet HTML 29Page - Active-Semi, Inc ACT8870QJ-T Datasheet HTML 30Page - Active-Semi, Inc Next Button
Zoom Inzoom in Zoom Outzoom out
 26 / 43 page
background image
ACT8870QJ-T
Rev 3.0, 02-Oct-2017
Innovative PowerTM
www.active-semi.com
ActiveSwitcherTM is a trademark of Active-Semi.
Copyright © 2016-2017 Active-Semi, Inc.
I2CTM is a trademark of NXP
26
PWM converters that achieve peak efficiencies of up to
96.5%. The buck converters switch at 2.25MHz and are
internally compensated, requiring only three small
external components (Cin, Cout, and L) for operation.
They ship with default output voltages that can be
modified via the I2C interface for systems that require
advanced power management functions.
Each buck converter has a dedicated input pin and
power ground pin. Each buck converter should have a
dedicated input capacitor that is optimally placed to
minimize the power routing loops for each buck
converter. Note that even though each buck converter
has separate inputs, all buck converter inputs must be
connected to the same voltage potential.
Buck 1 is configurable as a bypass switch for systems
with a 3.3V bus voltage. The bypass switch provides full
sequencing capability by allowing the 3.3V bus to be
used as the input to the other supplies and still be
properly sequenced to the downstream load.
Tie MODE to AGND to configure Buck1 for a switching
power supply. Tie MODE to VIN to configure Buck1 as
a bypass switch. MODE is only sampled when VIN
reaches its UVLO threshold. Changing the MODE pin
after startup has no effect. When Buck1 is configured as
a power supply, EXT_EN is a direct output of the
ACT8870 Buck1 enable signal. When Buck1 is
configured as a bypass switch, EXT_EN is a direct
output of the bypass switch enable signal.
The ACT8870 buck regulators are highly configurable
and can be quickly and easily reconfigured via I2C. This
allows them to support changes in hardware
requirements without the need for PCB changes.
Examples of I2C functionality are given below:
Real-time power good, OV, and current limit status
Ability to mask individual faults
Dynamically change output voltage
On/Off control
Softstart ramp
Slew rate control
Switching delay and phase control
Low power mode
Overcurrent thresholds
Refer to the Active-Semi Application Note describing the
Register Map for full details on I2C functionality and
programming ranges.
Operating Mode
The buck converters operate in fixed-frequency PWM
mode at medium to heavy loads. They transition to a
proprietary power-saving low power mode (LPM) at light
loads in order to save power. Each buck converter’s
LPM can be independently enabled or disabled via its
DISLPM I2C bit. Setting DISLPM = 0 enables LPM while
setting DISLPM = 1 disables LPM. Operating in LPM
saves power, while operating in forced PWM mode
gives better transient response. Each buck converter
output can be programmed between 2.8V and 5.5V with
the I2C register Bx_VSEL0[7:0].
Enable / Disable Control
When power is applied to the IC, all converters automat-
ically turn on according to a pre-programmed sequence.
Once in normal operation (ACTIVE state), each con-
verter can be independently disabled via I2C. Each CMI
version requires a different set of command to disable a
converter, so contact the factory for specific instructions
if needed. Each converter contains an optional inte-
grated discharge resistor that actively discharges the
output capacitor when the regulator is disabled. The dis-
charge function is enabled via the I2C bit Bx_DisPull-
down.
Soft-Start
Each buck regulator contains a softstart circuit that lim-
its the rate of change of the output voltage, minimizing
input inrush current and ensuring that the outputs power
up monotonically. This circuitry is effective any time the
regulator is enabled, as well as after responding to a
short circuit or other fault condition. Each regulator’s
softstart time is adjustable between 300us and 1000us
via its I2C bits SS_RAMP.
100% Duty Cycle Operation
The buck regulators are capable of operating at up to
100% duty cycle. During 100% duty cycle operation, the
high-side power MOSFETs are held on continuously,
providing a direct connection from the input to the output
(through the inductor), ensuring the lowest possible
dropout voltage in battery powered applications.
Dynamic Voltage Scaling
Each buck converter supports Dynamic Voltage Scaling
(DVS). DVS allows the user to optimize the processor’s
energy to complete tasks by lowering the processor’s
operating frequency and input voltage when lower per-
formance is acceptable. In normal operation, each out-
put regulates to the voltage programmed in the I2C reg-
ister Bx_VSET0. During DVS, each output regulates to
Bx_VSET1. The output transitions from Bx_VSET0 to
Bx_VSET1 at a rate determined by the output capaci-
tance and the load current. The outputs transition be-
tween VSET1 and VSET0 by the rate determined by the
I2C bits SLEW.


Nº de peça semelhante - ACT8870QJ-T

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Active-Semi, Inc
ACT8870QJ101-T ACTIVE-SEMI-ACT8870QJ101-T Datasheet
3Mb / 38P
   Advanced PMU for Microcontrollers and Solid State Drive Applications
REV 0 23-DEC-2016
More results

Descrição semelhante - ACT8870QJ-T

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Active-Semi, Inc
ACT88430QJ-T ACTIVE-SEMI-ACT88430QJ-T Datasheet
1Mb / 42P
   Advanced PMU for Microcontrollers and Solid State Drive Applications
Rev 1.0, 24-Oct-2018
ACT8870 ACTIVE-SEMI-ACT8870 Datasheet
3Mb / 38P
   Advanced PMU for Microcontrollers and Solid State Drive Applications
REV 0 23-DEC-2016
logo
Texas Instruments
TPS65835 TI1-TPS65835_16 Datasheet
2Mb / 67P
[Old version datasheet]   Advanced PMU
logo
Active-Semi, Inc
ACT8933 ACTIVE-SEMI-ACT8933 Datasheet
102Kb / 2P
   Advanced PMU for CoreLogic LUCY
04-Nov-10
ACT8896 ACTIVE-SEMI-ACT8896 Datasheet
88Kb / 2P
   Advanced PMU for Samsung S3C6410
29-Nov-10
ACT8933 ACTIVE-SEMI-ACT8933_14 Datasheet
723Kb / 44P
   Advanced PMU for CoreLogic LUCY
Rev 3, 15-Nov-12
ACT8935 ACTIVE-SEMI-ACT8935_10 Datasheet
98Kb / 2P
   Advanced PMU for SiRF Prima and Atlas IV
05-Nov-10
ACT8935 ACTIVE-SEMI-ACT8935_14 Datasheet
710Kb / 46P
   Advanced PMU for SiRF PrimaTM and Atlas IVTM
Rev 4, 17-Sep-13
ACT8895 ACTIVE-SEMI-ACT8895 Datasheet
114Kb / 2P
   Advanced PMU for SiRF Prima and Atlas IV
29-Nov-10
ACT8895 ACTIVE-SEMI-ACT8895_14 Datasheet
119Kb / 3P
   Advanced PMU for SiRF PrimaTM and Atlas IVTM
16-Aug-13
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com