ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
$ D0 ]. s: s- a* H2 x+ x: ddesigned for driving up to single 10-series or
9x3-series WLEDs from a single cell Lithium Ion-
  G+ }$ D; U4 x; r+ g' u3 Zbattery.
The ZCC3302 uses current mode, fixed frequency
architecture to regulate the LED current, which is
measured through an external current sense resistor.
Its low 300mV feedback voltage reduces power loss
* t/ C& H$ R2 `4 C. Xand improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
2 r0 v% `1 m" F. w0 t( ?5 |The 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..
7 R+ U; c" M6 K+ o5 Y' mPlease refer to the OPERATION DESCRIPTION and
7 L) S, \2 u" A' iAPPLICATION INFORMATION sections for more
4 ~, K- P3 @* V/ R7 \2 u) r. Gdetail.
, w+ ]' D% I4 T: t' ]3 t* \" x3 TThe ZCC3302 includes soft-start, under-voltage locko-
9 {6 t0 X% S+ Y' V. x$ o; k6 nut, current limiting and thermal overload protections.
2 G. ^& }1 E5 p# g$ MThe ZCC3302 is available in SOT23-6 package.
$ U9 H0 x/ X! HFEATURES
 Operating Voltage: 2.5-7.5V
 Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
 Maximum drive Capability: 9x3-series or
6x6-series.
 Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
4 F% E4 j7 O6 ?, y3 N3 W Low 300mV Feedback Voltage
 Support PWM Dimming
4 B- Z; T: |' o1 d' a* L Open-circuit Protection
 UVLO, Soft-Start and Thermal Shutdown
: ?2 h5 y7 G( a1 U. t5 }5 T Internal 1.5A Current Limit
. @5 d! p$ J) T- S+ A SOT23-6 Package
APPLICATIONS
 5~7” LCD Panels
- D9 p; @5 z/ Y9 e Handheld Computers and PDAs
 Digital Cameras
2 ~4 S- ~" V% H# {0 N: | Small LCD Displays
. Z7 F# w) H+ m; r' I* H: r! G