ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
' u3 v' M& o- z7 N" {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-
battery.
The ZCC3302 uses current mode, fixed frequency
architecture to regulate the LED current, which is
measured through an external current sense resistor.
1 r/ U  U/ C; h* H' m) P$ qIts low 300mV feedback voltage reduces power loss
and improves efficiency. The ZCC3302 supports hig-
% v  F# c" `# Fh frequency PWM Dimming through EN pin.
- g  \4 w( a/ P$ U$ iThe ZCC3302 is turned off if an open-circuit condition
( }/ U; \. U1 m. c# Dis presented. Please be noted that open-circuit
. M3 p6 s  G& }3 econdition is not the same as over-voltage condition..
Please refer to the OPERATION DESCRIPTION and
$ I# @) c- s. XAPPLICATION INFORMATION sections for more
* q1 ~1 ?- g- Y; P8 p+ r4 s3 d. tdetail.
2 u7 U2 @7 ^, B. D3 k) j2 eThe ZCC3302 includes soft-start, under-voltage locko-
ut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
FEATURES
 Operating Voltage: 2.5-7.5V
 Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
: a9 A0 q* Q7 C% o! u( n0 C! i. ] Maximum drive Capability: 9x3-series or
  s# _& a& }, p0 B1 g6x6-series.
 Up to 90% Efficiency
' g  ^: b( `8 i$ } 1.25MHz Fixed Switching Frequency
 Low 300mV Feedback Voltage
0 @% }' D8 [0 v9 A8 ^ Support PWM Dimming
1 M. q0 R, z- w/ `3 a Open-circuit Protection
. B) h0 L" X5 B- s' `. F* b UVLO, Soft-Start and Thermal Shutdown
& |3 c* v# x5 M$ S+ R/ M Internal 1.5A Current Limit
# v  L3 \9 V* ]3 n2 G SOT23-6 Package
& V  {& B3 u. L4 e) CAPPLICATIONS
2 b3 t" q; \" e# [1 F/ \) ^ 5~7” LCD Panels
 Handheld Computers and PDAs
7 g. n9 g" V( n0 `% L& S6 f: ` Digital Cameras
0 y# ~# ]: i. k% U Small LCD Displays
0 U' @- `. j* ]/ R. C  ~* r