7"在双节可驱动3串9并，单节3串7并 TP3894_TP3894

用在双节上可以驱动3串9并，单节只能到3串7并

DESCRJPTION
The  TP3984  is  a  constant  current  step-up  converter  specifically  designed  to  drive  white  LEDs.  The  Step-up  converter    topology    allows    series    connection    of    the  white  LEDs  so  the  LED  currents  are  identical  for  uniform  brightness.  The  TP3984  switches  at  1.1MHz,  allowing    the    use    of    tiny    external    components.  The  input  and  output  capacitor  can  be  as  small  as  1µF,  saving  space  and  cost  versus  alternative  solutions.  A  low  0.25V  feedback  voltage  minimizes  power  loss  in  the      current      setting      resistor      for      better      efficiency.  TP3984    is  enhanced  with  Soft-Start  function  and  that  could  significantly  reduce    noise  induced  by  capacitor.
The  TP3984  is  available  in  low  profile  SOT23-6  package.

FEATURES
·2.6V  to  5.5V  Input  Range
·27V  Output  with  Over  Voltage  Protection
·High  Efficiency  :85  %  Typical
·Internal  Soft-Start
·PWM  Dimming  Control
·Internal  High  Power  30V  MOSFET  Switch
·Fast  1.1MHz  Switching  Frequency
·Small,  Low-Profile  Inductors  and  Capacitors
·SOT23-6  Package
·RoHS  Compliant  and  100%  Lead  (Pb)-Free

APPLICATIONS
·Mobile  Phone
·Digital  Still  Camera
·PDAs,  Handheld  Computers
·MP3  Players
·GPS  Receivers

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7"在双节可驱动3串9并，单节3串7并 TP3894

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