ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
4 U' C2 Y6 ^, T4 a4 u4 @designed for driving up to single 10-series or
9x3-series WLEDs from a single cell Lithium Ion-
8 N3 m0 _; p3 J5 h4 U& V' F7 s$ [: g# abattery.
8 g: b$ g$ ^: c5 w( zThe ZCC3302 uses current mode, fixed frequency
. t( m1 V( ]+ q* _architecture to regulate the LED current, which is
measured through an external current sense resistor.
2 ?+ w+ E8 b) a5 kIts low 300mV feedback voltage reduces power loss
- i7 B: m; v1 n/ A& Gand improves efficiency. The ZCC3302 supports hig-
8 V6 l) f0 l$ A( I% x0 h8 [h frequency PWM Dimming through EN pin.
. X: e) e" C! G  b' Y) iThe ZCC3302 is turned off if an open-circuit condition
is presented. Please be noted that open-circuit
  M/ s3 J( n+ f; x! Scondition is not the same as over-voltage condition..
Please refer to the OPERATION DESCRIPTION and
APPLICATION INFORMATION sections for more
( F3 J9 T0 b2 Q$ s: ]detail.
The ZCC3302 includes soft-start, under-voltage locko-
% ~. D' c3 p) K4 j1 i" x3 }ut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
4 D6 P, J0 m% [; p  oFEATURES
, a- r9 ~: A' m  ]2 D Operating Voltage: 2.5-7.5V
 Maximum Output Voltage: 35V, capable of
6 ^; S) W8 ]9 T1 P5 a6 f* ^% cdriving 10-series White LED strings
$ D3 ]8 ?, n& d6 S) p! H% j+ Q Maximum drive Capability: 9x3-series or
' }5 G: \- E- n" W# e2 c1 {6x6-series.
& |8 U5 \! ]  b Up to 90% Efficiency
7 b1 z3 ~7 C6 n% ~  d 1.25MHz Fixed Switching Frequency
 Low 300mV Feedback Voltage
 Support PWM Dimming
! G. S* P$ f; q3 H( a, {, I Open-circuit Protection
 UVLO, Soft-Start and Thermal Shutdown
: p0 }+ ?6 ]! q- }! S4 H3 Z Internal 1.5A Current Limit
 SOT23-6 Package
APPLICATIONS
 5~7” LCD Panels
 Handheld Computers and PDAs
( v% t1 t4 `( _. ~( M Digital Cameras
 Small LCD Displays
" C7 i% V6 c' m