ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
- [! ]& U! y, ^; [3 dThe ZCC3302 is a 7.5V step-up DC/DC converter
7 Y/ `9 a! _  P5 B4 j8 Tdesigned for driving up to single 10-series or
9x3-series WLEDs from a single cell Lithium Ion-
5 q4 f* ^; J+ qbattery.
. z8 f! D& t. aThe ZCC3302 uses current mode, fixed frequency
2 o. ]2 |  {" Barchitecture to regulate the LED current, which is
4 r8 U+ J" J! I# X4 ]1 emeasured through an external current sense resistor.
Its low 300mV feedback voltage reduces power loss
' g. s  V& f& mand improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
9 M/ P# _! x, N- ^, ~The 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
4 m0 S* ]' K0 `+ i/ |APPLICATION INFORMATION sections for more
detail.
( F! b. D. r- aThe ZCC3302 includes soft-start, under-voltage locko-
7 _- W! w6 z: |+ c& U! c& q3 eut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
FEATURES
 Operating Voltage: 2.5-7.5V
1 J& c$ {/ f6 a2 }) A Maximum Output Voltage: 35V, capable of
% p& F9 m5 z7 I# Q+ J( bdriving 10-series White LED strings
 Maximum drive Capability: 9x3-series or
6x6-series.
 Up to 90% Efficiency
; U* g+ X4 }7 G- B8 t4 \% A 1.25MHz Fixed Switching Frequency
$ j. b+ C# U5 s8 c, e8 Y Low 300mV Feedback Voltage
 Support PWM Dimming
' y% ]% b0 {$ K7 j* ` Open-circuit Protection
: H" i, B# Y3 ~' G/ D2 Y7 ~; D UVLO, Soft-Start and Thermal Shutdown
 Internal 1.5A Current Limit
, y( c" J5 j+ y+ m SOT23-6 Package
APPLICATIONS
 5~7” LCD Panels
 Handheld Computers and PDAs
6 d5 O# F$ i- U6 D0 y Digital Cameras
 Small LCD Displays
+ e4 `. w& z6 E7 I& a