ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
3 T; `8 l7 }/ q6 nThe 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.
# M9 t, c; Z3 vThe ZCC3302 uses current mode, fixed frequency
architecture to regulate the LED current, which is
2 Z& J6 t+ r9 B4 L2 \4 jmeasured through an external current sense resistor.
8 E8 P( ?- Q2 {1 fIts low 300mV feedback voltage reduces power loss
# |/ }( _* ?2 M# F! p& K; o( sand improves efficiency. The ZCC3302 supports hig-
4 i4 ?6 a- e) S6 {h frequency PWM Dimming through EN pin.
The ZCC3302 is turned off if an open-circuit condition
2 M4 V6 p* e+ p  s/ @3 N8 |( h  `is presented. Please be noted that open-circuit
condition is not the same as over-voltage condition..
  N3 s0 ?) B$ J$ l8 a% ^) w9 fPlease refer to the OPERATION DESCRIPTION and
APPLICATION INFORMATION sections for more
detail.
1 `3 l& H" t3 kThe ZCC3302 includes soft-start, under-voltage locko-
* m6 d' _7 G  Q3 out, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
FEATURES
; d8 l3 d! C$ m% K! h. K Operating Voltage: 2.5-7.5V
8 W6 N7 [6 f& Y9 J5 P0 H$ z Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
 Maximum drive Capability: 9x3-series or
: ~$ J! W( M9 K/ ]& D6 h6x6-series.
 Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
 Low 300mV Feedback Voltage
 Support PWM Dimming
2 Q; Q" I0 S! o; c2 [ Open-circuit Protection
 UVLO, Soft-Start and Thermal Shutdown
' a# h$ x+ ^. e* g Internal 1.5A Current Limit
: U, e8 e( l! v& i1 P7 R SOT23-6 Package
APPLICATIONS
 5~7” LCD Panels
2 T8 B  B; A. t$ \8 Q# v, P Handheld Computers and PDAs
 Digital Cameras
 Small LCD Displays
* [' i, |/ N7 i; V& N$ h- n