ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
5 l* Q6 t7 t# s* t9 Q9 a# t% O( ydesigned for driving up to single 10-series or
" O1 W& y+ W% i6 v9x3-series WLEDs from a single cell Lithium Ion-
: K* h; t2 |# r5 \/ {- Gbattery.
1 h/ r! r0 K' w7 `0 ~/ xThe ZCC3302 uses current mode, fixed frequency
architecture to regulate the LED current, which is
' h; N! m7 Q! U) \measured through an external current sense resistor.
* f3 q9 [" A1 \) f1 Q9 n, l: Y9 r1 e4 {Its low 300mV feedback voltage reduces power loss
% ~/ J: ^4 F4 e' x% }" f' j% xand improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
, o* P4 K2 j$ TThe ZCC3302 is turned off if an open-circuit condition
is presented. Please be noted that open-circuit
# ^" H5 y$ E" l- ~9 @+ ncondition is not the same as over-voltage condition..
6 j6 G3 h& m9 W+ BPlease refer to the OPERATION DESCRIPTION and
APPLICATION INFORMATION sections for more
- _" S9 j5 e7 Odetail.
9 d4 s2 v- Y% q4 |The ZCC3302 includes soft-start, under-voltage locko-
1 y* m0 r8 C. X3 \ut, current limiting and thermal overload protections.
1 c8 J' m  W9 {  v2 F3 d/ _$ }The ZCC3302 is available in SOT23-6 package.
FEATURES
  u; g2 [! v" t' z3 C5 }& u Operating Voltage: 2.5-7.5V
) c8 i/ _$ X# |: a( ]2 O Maximum Output Voltage: 35V, capable of
8 X  h; ?% I: y  \driving 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
 Open-circuit Protection
7 x& H3 H$ x! x1 r/ f UVLO, Soft-Start and Thermal Shutdown
7 S4 ^( x. \  N4 H  G! ?6 g Internal 1.5A Current Limit
7 }! m3 R* e% Z7 Z( _1 b: I' Q. F0 \ SOT23-6 Package
& a. P+ a4 i  @9 rAPPLICATIONS
& e9 ]' u0 K7 G0 a3 {: `) t" a* r 5~7” LCD Panels
6 J/ U: o8 L0 ?+ c: M. p Handheld Computers and PDAs
 Digital Cameras
" x7 ]6 a+ g3 W: z  p* e: E& { Small LCD Displays