ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
- j' h! `7 h  z2 m& Udesigned for driving up to single 10-series or
9x3-series WLEDs from a single cell Lithium Ion-
battery.
The ZCC3302 uses current mode, fixed frequency
architecture to regulate the LED current, which is
4 L" N8 w4 S" ]4 v( g; V: nmeasured through an external current sense resistor.
Its low 300mV feedback voltage reduces power loss
and improves efficiency. The ZCC3302 supports hig-
/ {1 n# M3 I4 C5 k& s5 W8 ?% |h frequency PWM Dimming through EN pin.
4 U9 b2 ?  J" j( \The ZCC3302 is turned off if an open-circuit condition
+ l- e- O4 O; Q& O' v$ @is presented. Please be noted that open-circuit
condition is not the same as over-voltage condition..
; U  p6 z5 u; A# G: Q6 uPlease refer to the OPERATION DESCRIPTION and
: j% F! P0 H7 }; N  MAPPLICATION INFORMATION sections for more
detail.
$ L7 S+ Y" b3 p; h8 N( KThe ZCC3302 includes soft-start, under-voltage locko-
ut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
1 r1 r% v5 E- V1 ?/ W2 BFEATURES
 Operating Voltage: 2.5-7.5V
 Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
' M/ l) {, P8 G/ v+ u' H; F Maximum drive Capability: 9x3-series or
3 {3 c5 w& }* }4 B6x6-series.
 Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
 Low 300mV Feedback Voltage
" }+ C0 u4 E; g) W3 E# D Support PWM Dimming
 Open-circuit Protection
* d% q9 ?( |9 w' `( M UVLO, Soft-Start and Thermal Shutdown
$ {0 i! a" R1 n# @6 r' ^) v1 F9 U/ ]1 \ Internal 1.5A Current Limit
7 @! w9 e; K/ u/ S. @- q0 k' i; ], | SOT23-6 Package
APPLICATIONS
4 y) j' l" Q9 a3 P1 e 5~7” LCD Panels
 Handheld Computers and PDAs
 Digital Cameras
! Y; [$ {4 V" H' X5 S Small LCD Displays
0 s( e5 `- P! }0 J6 J