ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
designed for driving up to single 10-series or
) P7 B8 @% G4 Y, M9x3-series WLEDs from a single cell Lithium Ion-
battery.
The ZCC3302 uses current mode, fixed frequency
6 \" M# A( @2 e2 N* u. |% marchitecture to regulate the LED current, which is
; O  f& r( o; ?8 xmeasured through an external current sense resistor.
Its low 300mV feedback voltage reduces power loss
and improves efficiency. The ZCC3302 supports hig-
2 _$ l+ F  y3 G8 Ah frequency PWM Dimming through EN pin.
The ZCC3302 is turned off if an open-circuit condition
8 }7 J/ A* t- J0 v9 _" v  @) w9 gis presented. Please be noted that open-circuit
condition is not the same as over-voltage condition..
' t/ j0 [) [! J3 Q% DPlease refer to the OPERATION DESCRIPTION and
APPLICATION INFORMATION sections for more
detail.
- y0 m8 [5 h7 o' C8 \- D$ D7 w% FThe ZCC3302 includes soft-start, under-voltage locko-
ut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
' A4 {( {! R7 y- Y: XFEATURES
' B  B0 h  N) g4 x: _ Operating Voltage: 2.5-7.5V
 Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
  i! p$ u, Y" ?) D$ [ Maximum drive Capability: 9x3-series or
6x6-series.
 Up to 90% Efficiency
 1.25MHz Fixed Switching Frequency
8 ^5 ^& O, H& P" t Low 300mV Feedback Voltage
0 m1 N( V+ e# ^  C) k3 H Support PWM Dimming
0 B/ O# Q, h0 j8 I  }2 v5 T Open-circuit Protection
5 T3 h' U  y0 _6 \ UVLO, Soft-Start and Thermal Shutdown
 Internal 1.5A Current Limit
 SOT23-6 Package
APPLICATIONS
# h5 P. Q; C9 }4 Y* D 5~7” LCD Panels
 Handheld Computers and PDAs
% e. A4 c- t: K" N Digital Cameras
$ ]% M0 d. {4 j, C# W Small LCD Displays