ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
3 P" B$ U  T, E$ c6 V2 FThe ZCC3302 is a 7.5V step-up DC/DC converter
# Z/ [2 e5 L4 U' G' Jdesigned for driving up to single 10-series or
9x3-series WLEDs from a single cell Lithium Ion-
battery.
5 o; n% P3 f, Y) [The ZCC3302 uses current mode, fixed frequency
" _( n& Z% K% i5 y9 Tarchitecture to regulate the LED current, which is
8 }! R2 @0 Q. v" q1 E8 e; t9 Smeasured through an external current sense resistor.
! R% [: H. s& h, @Its low 300mV feedback voltage reduces power loss
and improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
The ZCC3302 is turned off if an open-circuit condition
- o7 ?! ?$ u7 @6 ]9 {' jis presented. Please be noted that open-circuit
condition is not the same as over-voltage condition..
Please refer to the OPERATION DESCRIPTION and
" ^/ Z  s% X, IAPPLICATION INFORMATION sections for more
! y  g9 k6 e$ _8 ?* [7 Rdetail.
The ZCC3302 includes soft-start, under-voltage locko-
ut, current limiting and thermal overload protections.
6 W- c  D% W- p$ LThe ZCC3302 is available in SOT23-6 package.
FEATURES
. j0 @7 ^- Y  J Operating Voltage: 2.5-7.5V
! ^$ J% J( O! e) ]8 I" X3 t Maximum Output Voltage: 35V, capable of
. s$ L- e$ g8 L* H7 N" Udriving 10-series White LED strings
 Maximum drive Capability: 9x3-series or
. S0 f& G! x+ j( _. b6x6-series.
: ?# n7 G. C5 b6 S$ s  J Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
  o7 P7 q& @0 l1 k5 h Low 300mV Feedback Voltage
 Support PWM Dimming
; d* m6 K5 d& k+ W; T# P& q Open-circuit Protection
5 k) L2 s/ }" O0 Y$ i! y- l$ L- \ UVLO, Soft-Start and Thermal Shutdown
: }* [) e4 ~& _- I Internal 1.5A Current Limit
& f0 W; o& _: N5 y1 A3 f SOT23-6 Package
: p+ h1 O  R8 A# q( {% S: `; @APPLICATIONS
 5~7” LCD Panels
 Handheld Computers and PDAs
2 C0 `+ S& o4 m: V Digital Cameras
6 N3 a/ C7 J1 G9 _2 h; P Small LCD Displays
' N/ b0 Q# V0 f5 ]) C