ZCC3302 替代MP3302

四维电子

GENERAL DESCRIPTION
The ZCC3302 is a 7.5V step-up DC/DC converter
% q! Z% h7 Y! odesigned for driving up to single 10-series or
; ?; Y! z' f5 z  T7 K' K9x3-series WLEDs from a single cell Lithium Ion-
battery.
$ u. Q6 s5 d* G0 EThe 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
and improves efficiency. The ZCC3302 supports hig-
h frequency PWM Dimming through EN pin.
4 T7 j: `* e4 Y/ L+ I- bThe ZCC3302 is turned off if an open-circuit condition
4 K% A, X% D2 p$ Tis presented. Please be noted that open-circuit
condition is not the same as over-voltage condition..
  B2 G) L9 H4 f6 GPlease refer to the OPERATION DESCRIPTION and
APPLICATION INFORMATION sections for more
detail.
The ZCC3302 includes soft-start, under-voltage locko-
# `+ O6 S/ g# r8 N5 `  Q' uut, current limiting and thermal overload protections.
The ZCC3302 is available in SOT23-6 package.
! w9 q  V: K# L# K9 U  H2 X, S3 tFEATURES
2 I8 o+ c& m7 w Operating Voltage: 2.5-7.5V
 Maximum Output Voltage: 35V, capable of
driving 10-series White LED strings
 Maximum drive Capability: 9x3-series or
! K" f/ h, v8 Z' N6x6-series.
( f5 ^& b& F$ ]: O8 n Up to 90% Efficiency
9 t8 B3 U6 }" W4 N' a- R* } 1.25MHz Fixed Switching Frequency
7 B& x/ k% a- \ Low 300mV Feedback Voltage
+ l/ p& B" m5 l8 [# j Support PWM Dimming
8 h$ ~$ g/ |! L3 N2 ^, R: ? Open-circuit Protection
, }7 N$ @" N. w" X) I- G UVLO, Soft-Start and Thermal Shutdown
- w3 m0 C# s, ], O Internal 1.5A Current Limit
3 g& N$ w" }: K- l SOT23-6 Package
APPLICATIONS
 5~7” LCD Panels
9 u8 O1 B5 v! U0 c" r7 l$ {0 }& W Handheld Computers and PDAs
 Digital Cameras
' u% G0 J" \3 b  N: r Small LCD Displays
& L" Z7 D% X% j- ^2 Z