ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
' p" e( G# k; x4 p, p. |) uThe ZCC3302 is a 7.5V step-up DC/DC converter
designed for driving up to single 10-series or
9x3-series WLEDs from a single cell Lithium Ion-
5 J7 C  M, h2 b' m9 Qbattery.
The ZCC3302 uses current mode, fixed frequency
1 X2 t7 S7 O5 J5 {' p7 warchitecture to regulate the LED current, which is
measured 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.
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..
5 ~4 X! V' m' JPlease refer to the OPERATION DESCRIPTION and
$ u' u0 c; I! X6 kAPPLICATION INFORMATION sections for more
2 c; G( G$ ?" T5 u" O7 }: z, k9 n$ gdetail.
The ZCC3302 includes soft-start, under-voltage locko-
ut, current limiting and thermal overload protections.
2 y8 J9 G- f6 EThe ZCC3302 is available in SOT23-6 package.
4 R& f3 j- b' Y% y3 MFEATURES
. x6 A) j* o/ s  B9 m2 k( } Operating Voltage: 2.5-7.5V
( m7 P$ [) y$ ]! W Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
/ Q, K" p% J- J6 V Maximum drive Capability: 9x3-series or
6x6-series.
 Up to 90% Efficiency
2 d4 D/ U; `! o9 M+ y 1.25MHz Fixed Switching Frequency
' A/ Q# c- C/ q5 J Low 300mV Feedback Voltage
 Support PWM Dimming
. k# g! f4 N1 j$ L2 P9 o. v) j Open-circuit Protection
 UVLO, Soft-Start and Thermal Shutdown
- ?8 y- w% N2 R Internal 1.5A Current Limit
 SOT23-6 Package
APPLICATIONS
5 l9 h+ G* n% N% v' ]3 m 5~7” LCD Panels
 Handheld Computers and PDAs
 Digital Cameras
# f9 k6 A' y6 {9 x, b Small LCD Displays