ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
; K& R6 s" X& l3 `* edesigned for driving up to single 10-series or
$ e4 R- e8 l+ F7 X0 ^! E9x3-series WLEDs from a single cell Lithium Ion-
battery.
3 m+ u. Y5 R6 L4 i4 b/ Q3 Z, JThe ZCC3302 uses current mode, fixed frequency
architecture to regulate the LED current, which is
measured through an external current sense resistor.
# j: r) W/ s" ?2 X3 q0 RIts low 300mV feedback voltage reduces power loss
and improves efficiency. The ZCC3302 supports hig-
/ h, U- j3 w- C! Eh frequency PWM Dimming through EN pin.
6 h) T1 B! X" P! L3 N8 _, K) [; YThe ZCC3302 is turned off if an open-circuit condition
/ D* k& t/ [6 w% ~3 |is presented. Please be noted that open-circuit
condition is not the same as over-voltage condition..
7 n& Q9 `  P  q( bPlease refer to the OPERATION DESCRIPTION and
, B! N- _. a" Z; zAPPLICATION INFORMATION sections for more
detail.
The ZCC3302 includes soft-start, under-voltage locko-
) R' e: J" u/ H# h" k) Vut, current limiting and thermal overload protections.
3 G- K: T5 t" ^, _The ZCC3302 is available in SOT23-6 package.
FEATURES
 Operating Voltage: 2.5-7.5V
/ R3 T0 c6 u$ R# C/ O Maximum Output Voltage: 35V, capable of
+ k% l6 K$ V* x0 i( mdriving 10-series White LED strings
 Maximum drive Capability: 9x3-series or
' ~& y+ S$ h6 _: u6x6-series.
% |0 U( I/ x3 n6 ` Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
 Low 300mV Feedback Voltage
 Support PWM Dimming
 Open-circuit Protection
 UVLO, Soft-Start and Thermal Shutdown
 Internal 1.5A Current Limit
+ P0 [3 S/ @3 z0 {' z SOT23-6 Package
/ r% ~* @: L) D. @& G; R, r- S# @9 yAPPLICATIONS
+ D# H: E; U0 E! b' t, t/ l% t 5~7” LCD Panels
 Handheld Computers and PDAs
 Digital Cameras
" g3 o" J; `7 o) q. V Small LCD Displays