ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
7 s1 {! ?0 }) b  l  T; k" DThe ZCC3302 is a 7.5V step-up DC/DC converter
3 R; x4 R3 n. t. s- \designed for driving up to single 10-series or
' x' x! _2 p, \# E& p% G" Q8 g+ F' i9x3-series WLEDs from a single cell Lithium Ion-
! B2 A# x; Q% g: _! t0 |battery.
The ZCC3302 uses current mode, fixed frequency
architecture to regulate the LED current, which is
1 J: x2 `6 T; @3 V# d( umeasured through an external current sense resistor.
Its low 300mV feedback voltage reduces power loss
1 c' }( Y- c2 c/ E3 e% hand improves efficiency. The ZCC3302 supports hig-
3 k! ^: ?' O# C, b. F( wh frequency PWM Dimming through EN pin.
The ZCC3302 is turned off if an open-circuit condition
is presented. Please be noted that open-circuit
& h$ @5 w# I/ m% Xcondition is not the same as over-voltage condition..
Please refer to the OPERATION DESCRIPTION and
6 p4 k0 C! w! P0 C! OAPPLICATION INFORMATION sections for more
  O- u) t9 Q* P6 ^5 Ndetail.
The ZCC3302 includes soft-start, under-voltage locko-
ut, current limiting and thermal overload protections.
  R+ ^( z# F4 V. S! v4 F4 c6 P& p1 q4 ^The ZCC3302 is available in SOT23-6 package.
FEATURES
 Operating Voltage: 2.5-7.5V
: N+ H$ ~4 g! u Maximum Output Voltage: 35V, capable of
2 @2 @9 t* H3 r# }( @5 bdriving 10-series White LED strings
. A# Z) d  U9 p6 m) k, l Maximum drive Capability: 9x3-series or
9 Z" |0 y& }; L1 @- @6x6-series.
' P( O/ Y+ p, } Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
 Low 300mV Feedback Voltage
6 P. z: w8 d, y1 `: \ Support PWM Dimming
1 n" e9 M! k' }- D Open-circuit Protection
 UVLO, Soft-Start and Thermal Shutdown
! x) }" b, J, A& a Internal 1.5A Current Limit
, {+ V3 {' w2 H$ Q' N, [: ?* H4 Y5 y SOT23-6 Package
APPLICATIONS
 5~7” LCD Panels
- Q- _# x7 m) h  _' J Handheld Computers and PDAs
  k, O4 Y: v. Q; J; H: l% \# a Digital Cameras
( @8 `8 _1 r/ `3 [/ k5 w Small LCD Displays