ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
1 O# S; X: ?8 v8 g6 k& x' W4 m8 vThe ZCC3302 is a 7.5V step-up DC/DC converter
designed for driving up to single 10-series or
6 c+ I* O6 T2 y3 v2 e$ P$ z9x3-series WLEDs from a single cell Lithium Ion-
battery.
The ZCC3302 uses current mode, fixed frequency
2 b) G1 a: y% b" a& s3 D* K, earchitecture to regulate the LED current, which is
0 e- B' P& U& q, Xmeasured through an external current sense resistor.
2 L9 M/ ~+ B0 A7 K" G; _" Q2 G0 lIts low 300mV feedback voltage reduces power loss
and improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
The ZCC3302 is turned off if an open-circuit condition
6 F* y+ t' y& r4 Mis presented. Please be noted that open-circuit
% N$ z7 L" q2 I7 _4 Qcondition is not the same as over-voltage condition..
& U! Q8 B7 ^9 x) [( KPlease refer to the OPERATION DESCRIPTION and
6 C, {# j* ?  i% P2 ?' mAPPLICATION INFORMATION sections for more
3 w  X, A+ ?! f* P) o; ?detail.
3 _: |  \) {7 a* @+ s2 h. J. DThe ZCC3302 includes soft-start, under-voltage locko-
/ P6 w( g: c: v% N# @1 h& d) i/ h+ @ut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
FEATURES
 Operating Voltage: 2.5-7.5V
8 g* ^# {* |( S Maximum Output Voltage: 35V, capable of
3 B  T& m! X' n+ ?- C, adriving 10-series White LED strings
 Maximum drive Capability: 9x3-series or
6x6-series.
 Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
 Low 300mV Feedback Voltage
 Support PWM Dimming
3 @& v$ `2 O3 \% y- i+ Z Open-circuit Protection
3 x: A4 S( C5 S: @ UVLO, Soft-Start and Thermal Shutdown
 Internal 1.5A Current Limit
 SOT23-6 Package
% P; H5 V6 k2 u4 v% M: TAPPLICATIONS
$ i2 K  V% t. @! \3 C 5~7” LCD Panels
 Handheld Computers and PDAs
 Digital Cameras
 Small LCD Displays
8 j; g1 U4 v: V( j' L% K9 l