ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
designed for driving up to single 10-series or
9x3-series WLEDs from a single cell Lithium Ion-
! ~4 Y* c( A2 C  \- e; }1 Abattery.
, n, x. j3 }- q4 ^. z1 U' TThe ZCC3302 uses current mode, fixed frequency
architecture to regulate the LED current, which is
measured through an external current sense resistor.
Its low 300mV feedback voltage reduces power loss
) ~8 c# \2 A. M% g9 I+ Qand improves efficiency. The ZCC3302 supports hig-
5 I" ^) T' n9 @0 u( k% x* ]9 Hh frequency PWM Dimming through EN pin.
; f, y% D( D, G0 `0 z. qThe ZCC3302 is turned off if an open-circuit condition
is presented. Please be noted that open-circuit
condition is not the same as over-voltage condition..
Please refer to the OPERATION DESCRIPTION and
APPLICATION INFORMATION sections for more
detail.
3 |. S( G7 y' ?The ZCC3302 includes soft-start, under-voltage locko-
9 i. c! H0 _/ s# P3 _ut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
0 H7 n, W) T" oFEATURES
8 A  P% o& ?. \$ o5 c Operating Voltage: 2.5-7.5V
 Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
 Maximum drive Capability: 9x3-series or
6x6-series.
 Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
+ ~1 a! z; J: q! b Low 300mV Feedback Voltage
# m: n: Q% t7 W' H; t Support PWM Dimming
* @  R- U1 ~- L6 G6 r! ^ Open-circuit Protection
9 F8 A$ {. g$ ~( ]  M UVLO, Soft-Start and Thermal Shutdown
4 S( {) _: I5 x! e1 g' a Internal 1.5A Current Limit
 SOT23-6 Package
  n# |$ O4 B$ [/ K% R# qAPPLICATIONS
1 p, j. }9 Z  @! ?" p 5~7” LCD Panels
 Handheld Computers and PDAs
 Digital Cameras
/ s  i7 A& ?+ S, x: t; A0 l. p Small LCD Displays
4 x4 P2 j( L6 `