ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
) A6 M. }6 M; g0 l5 JThe 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-
1 y! Q1 b- a5 gbattery.
2 |) U! {. k4 gThe ZCC3302 uses current mode, fixed frequency
architecture to regulate the LED current, which is
measured through an external current sense resistor.
: M& m' r% Y2 |* W9 o1 XIts low 300mV feedback voltage reduces power loss
/ n0 m( E4 `1 g! h$ xand improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
9 j7 h  M) E2 U" O' B( d! HThe ZCC3302 is turned off if an open-circuit condition
1 r# h4 x. [' Y! Jis 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.
The ZCC3302 is available in SOT23-6 package.
# }! m' J" o3 Z" ?& ^% X, d& WFEATURES
 Operating Voltage: 2.5-7.5V
+ l5 _3 e6 D5 x7 U! G( {/ | Maximum Output Voltage: 35V, capable of
/ Q$ P. z; y. G; n0 U! |driving 10-series White LED strings
8 M0 ^, U" D- N& I/ w Maximum drive Capability: 9x3-series or
  _0 ^( L, _# U! L/ V6x6-series.
 Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
: @1 |, d$ b- r. C* P+ G/ P9 O# \ Low 300mV Feedback Voltage
, q* L) i3 x# W2 ]% k( q5 u Support PWM Dimming
 Open-circuit Protection
 UVLO, Soft-Start and Thermal Shutdown
* e' J3 l2 e' v: y- Q Internal 1.5A Current Limit
 SOT23-6 Package
APPLICATIONS
5 m8 G2 R9 i$ o( d 5~7” LCD Panels
, N: \8 `, i" R2 B Handheld Computers and PDAs
 Digital Cameras
 Small LCD Displays
3 ~. _2 T4 D1 r& j1 r- X) ?2 ]