ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
1 ~$ b8 h: j7 W" M: X9 A9 y' bdesigned for driving up to single 10-series or
% ]( h- ?4 S! T  x$ x9x3-series WLEDs from a single cell Lithium Ion-
battery.
The ZCC3302 uses current mode, fixed frequency
' Q: T1 |/ G; |7 {# barchitecture to regulate the LED current, which is
9 z+ L" y/ ~% T7 `. W, {. a6 imeasured through an external current sense resistor.
! H: S! b' V* S1 L; e. fIts low 300mV feedback voltage reduces power loss
5 @& y% J# x* Z9 J# ^; |! }; wand improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
1 {' J& K; |% P6 A0 T8 \2 W) @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
APPLICATION INFORMATION sections for more
detail.
The ZCC3302 includes soft-start, under-voltage locko-
ut, current limiting and thermal overload protections.
1 R, t# H" V# S* g4 |The ZCC3302 is available in SOT23-6 package.
) W9 l4 z5 m  [0 O, b4 YFEATURES
 Operating Voltage: 2.5-7.5V
, N5 g9 f' B* G# D$ x# a! p8 n+ B6 d Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
 Maximum drive Capability: 9x3-series or
+ C3 h) h; l/ E. O* s6 O4 d6x6-series.
7 _* o0 G+ [, d1 s) {- v Up to 90% Efficiency
& H" O- P( e& y+ I; c8 [$ I$ x( _ 1.25MHz Fixed Switching Frequency
 Low 300mV Feedback Voltage
 Support PWM Dimming
 Open-circuit Protection
& B8 w+ d( m- Y- j: S5 J3 X, q UVLO, Soft-Start and Thermal Shutdown
 Internal 1.5A Current Limit
# `6 `9 `4 k- C; `: i# { SOT23-6 Package
APPLICATIONS
2 G8 H1 H4 W3 c# d+ y5 q 5~7” LCD Panels
4 p% r3 ?( d* t& y9 e Handheld Computers and PDAs
3 i/ ^+ W  w* T5 R5 e8 D, i Digital Cameras
 Small LCD Displays