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Details, datasheet, quote on part number:ZXSC400
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Datasheet text preview:
ZXSC400
LED DRIVER BOOST CONVERTER
DESCRIPTION
The ZXSC400 is a voltage mode boost converter in the SOT23-6 package. Its low feedback voltage allows the current in a chain of LEDs to be set and accurately monitored with a single resistor giving minimal losses. Its excellent load and line regulation means that for the full supply range from lithium-ion cells, the LED current will typically change by less than 1%. Using high efficiency Zetex switching transistors with ratings of 20V and higher allow many LEDs to be chained in series for the best LED current matching possible.
FEATURES
· 1.8V to 8V supply range · Typical output regulation of 1% · Over 80% typical efficiency · 4.5 A typical shutdown current · Series connection for ultimate LED current matching
S O T 2 3 -6
APPLICATIONS
· White LED backlighting for colour LCD panels · General LED backlighting · High performance white LED flashlights · General LED driving from batteries
PINOUT
ORDERING INFORMATION
DEVICE
ZXSC400E6TA
REEL SIZE
7"
TAPE WIDTH
8mm
QUANTITY PER REEL
3000 units
VCC GND STDN
Top View
DRIVE VFB SENSE
DEVICE MARKING
· C400
ISSUE 1 - JANUARY 2003 1
ZXSC400
ABSOLUTE MAXIMUM RATINGS
VCC DRIVE EOR STDN SENSE Operating Temp. Storage Temp. Power Dissipation -0.3V to -0.3V to -0.3V to -0.3V to -0.3V to -40°C to -55°C to 450mW +10V VCC + 0.3V VCC + 0.3V The lower of (+5.0V) or (VCC + 0.3V) The lower of (+5.0V) or (VCC + 0.3V) +85°C +125°C
ELECTRICAL CHARACTERISTICS Test Conditions VCC= 3V, T= -40°C to 85°C unless otherwise stated.
Symbol Parameter Conditions Min Supply parameters VIN Iq1 ISTDN Eff1 AccREF TCOREF TDRIVE FOSC VSENSE ISENSE VFB IFB2 VIH VIL dVLN IOUT3 IDRIVE VDRIVE CDRIVE dILD4
Note
1 2 3 4
Limits Typ Max
Units
VCC Range Quiescent Current Shutdown Current Efficiency Reference tolerance Reference Temp Co Discharge pulse width Operating Frequency 1.8V ILED > 10mA 1.8V < VCC < 8V VCC = 8V
1.8
8 220 4.5 80
V A A %
-3.0 0.005 1.7
3.0
% %/ C s
200
kHz
Input parameters Sense voltage Sense input current Feedback voltage Feedback input current Shutdown high voltage Shutdown low voltage Line voltage regulation VFB = 0V, VSENSE = 0V VFB = 0V, VSENSE = 0V 22 -1 291 -1.2 1.5 0 0.5 28 -7 300 34 -15 309 -4.5 VCC 0.55 V V %/V mV A mV A
Output parameters Output current Transistor drive current Transistor voltage drive Mosfet gate drive cpbty Load current regulation Vin > 2V, Vout = 10.5V Vdrive = 0.7V 1.8V < VCC < 8V 50 2 0 300 0.1 3.5 5 VCC-0.4 mA mA V pF mA/V
Excluding gate/base drive current. IFB is typically half these values at 300mV. System not device spec, including recommended transistors. 10.5V represents 3 white LEDs. Change in LED current with changing supply voltage (LED VF x number of series LEDs).
ISSUE 1 - JANUARY 2003 2
ZXSC400
TYPICAL CHARACTERISTICS
ISSUE 1 - JANUARY 2003 3
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