ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
5 v2 s6 N( b0 z7 Z* @' X  X# Pdesigned for driving up to single 10-series or
9x3-series WLEDs from a single cell Lithium Ion-
* C! c4 @1 h6 G6 {battery.
The ZCC3302 uses current mode, fixed frequency
: N/ O8 Z. ^( `1 _% a1 marchitecture to regulate the LED current, which is
measured through an external current sense resistor.
Its low 300mV feedback voltage reduces power loss
6 `( v0 Z8 p' o7 s6 {) N6 e% Xand improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
8 k; Q( g& L0 u3 e' B, WThe ZCC3302 is turned off if an open-circuit condition
+ C) Y0 Q1 U- [4 Zis presented. Please be noted that open-circuit
condition is not the same as over-voltage condition..
1 o0 K# S& M: q) ?2 [3 u( ]% O/ uPlease refer to the OPERATION DESCRIPTION and
$ C& x  M  X( ?$ v4 WAPPLICATION INFORMATION sections for more
detail.
The ZCC3302 includes soft-start, under-voltage locko-
! }9 q; O1 t4 F$ ?ut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
0 B8 g7 g+ }5 MFEATURES
- d  G8 D2 g# U( } Operating Voltage: 2.5-7.5V
 Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
! R/ z; Q5 {# D' \7 S- @ Maximum drive Capability: 9x3-series or
9 p. p! e4 j1 D2 c; @: W6 r% |6x6-series.
 Up to 90% Efficiency
+ Z! _: ~# Z, o  b! A4 l. \ 1.25MHz Fixed Switching Frequency
6 M! t7 |( l, E) E Low 300mV Feedback Voltage
' Z& _& P) T/ X' z( w/ ` Support PWM Dimming
 Open-circuit Protection
% D5 y* q7 X9 j, z6 n UVLO, Soft-Start and Thermal Shutdown
 Internal 1.5A Current Limit
 SOT23-6 Package
' ]! [( v5 a+ R( v  JAPPLICATIONS
5 |0 g& b* K5 k7 v; B 5~7” LCD Panels
 Handheld Computers and PDAs
 Digital Cameras
6 W% E4 V$ W/ m7 N7 W' F  b3 ? Small LCD Displays