ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
# Z$ i, K6 K5 x0 xdesigned 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
3 n3 n6 S0 I# e8 |; a5 Darchitecture to regulate the LED current, which is
5 d' h* X* n; Y+ ~. I* Z* r% k9 t$ Smeasured through an external current sense resistor.
Its low 300mV feedback voltage reduces power loss
and improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
& X6 X% ^2 J$ E* }/ aThe ZCC3302 is turned off if an open-circuit condition
is presented. Please be noted that open-circuit
condition is not the same as over-voltage condition..
" [! e: B" \9 }+ I" V, C) iPlease refer to the OPERATION DESCRIPTION and
$ [' J6 J8 ]( h4 v+ g4 {/ aAPPLICATION INFORMATION sections for more
5 K$ r9 j7 I3 j4 e8 b3 tdetail.
The ZCC3302 includes soft-start, under-voltage locko-
  E- A2 M& @5 X) k) q" W0 Eut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
FEATURES
 Operating Voltage: 2.5-7.5V
 Maximum Output Voltage: 35V, capable of
1 f) B1 `' Y5 }, y1 D; rdriving 10-series White LED strings
- k6 o1 A7 h  u& Q Maximum drive Capability: 9x3-series or
6x6-series.
1 q+ z$ u8 ^7 I. f/ N, m: y3 z Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
 Low 300mV Feedback Voltage
 Support PWM Dimming
+ E1 z1 W+ l# s( w5 z* U" S Open-circuit Protection
- B! N/ ?4 K5 m- c UVLO, Soft-Start and Thermal Shutdown
 Internal 1.5A Current Limit
 SOT23-6 Package
* A' Y2 ]. V+ K; T) p# JAPPLICATIONS
 5~7” LCD Panels
, k5 A2 k6 v* x0 \1 d Handheld Computers and PDAs
 Digital Cameras
 Small LCD Displays
" V9 _, j# k2 u& _# x