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ZXSC310, ZXSC310E5, ZXSC400

Table of contents:
Info of ZXSC310
Info of ZXSC310E5
Info of ZXSC400

ZXSC310, ZXSC310E5, ZXSC400 Selling Leads, Datasheet

MFG:ZETEX Package Cooled:SOT23-5 D/C:07+

ZXSC310, ZXSC310E5, ZXSC400 Datasheet download

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Part Number: ZXSC310

MFG: ZETEX

Package Cooled: SOT23-5

D/C: 07+

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ZXSC310 General Description

The ZXSC310 is a single or multi cell LED driver designed for LCD backlighting applications. The input voltage range of the device is between 0.8V and 8V. This means the ZXSC310 is compatible with single NiMH, NiCd or Alkaline cells, as well as multi-cell or LiIon batteries.

The device features a shutdown control, resulting in a standby current less than 5A, and an output capable of driving serial or parallel LED's. The circuit generates constant power output, which are ideal for driving single or multiple LED's over a wide range of operating voltages. These features make the device ideal for driving LED's particularly in LCD backlight applications for Digital Still cameras and PDA's.

The ZXSC310 is a PFM DC-DC controller IC that drives an external Zetex switching transistor with a very low saturation resistance. These transistors are the best switching devices available for this type of conversion enabling high efficiency conversion with low input voltages. The drive output of the ZXSC310 LED driver generates a dynamic drive signal for the switching transistor.

The circuit can start up under full load and operates down to an input voltage of 0.8 volts. The solution configuration ensures optimum efficiency over a wider range of load currents; several circuit configurations are possible depending on battery life versus brightness considerations.

The ZXSC310 is offered in the SOT23-5 package which, when combined with a SOT23 switching transistor, generates a high efficiency small size circuit solution. The IC and discrete combination offers the ultimate cost Vs performance solution for LED backlight applications.

ZXSC310 Maximum Ratings

Supply Voltage .............. -0.3 to 10V
Maximum Voltage other pins ....-0.3 to VCC+0.3V
Power Dissipation .............. 450mW
Operating Temperature ......... -40 to 85
Storage Temperature .......... -55 to 125

ZXSC310 Features

` 94% efficiency
` Minimum operating input voltage 0.8V
` Maximum operating input voltage 8V
` Standby current less than 5A
` Programmable output current
` Series or parallel LED configuration
` Low saturation voltage switching transistor
` SOT23-5 package

ZXSC310 Typical Application

· LCD backlights:
                  Digital still camera
                  PDA
                  Mobile phone
· LED flashlights and torches
· White LED driving
· Multiple LED driving

ZXSC400 General 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.

ZXSC400 Maximum Ratings

Part Number	ZXSC400
Min and Max Input Voltage (V)	1.8 ~ 8
Output Voltage (V)	Vin to Vm
Typ Peak Output Current (A)	0.0035
Max Output Current (mA)	0.005
Operating Ambient Temp Range (°C)	-40 to 85
Efficiency (%)	80
Quiescent Current (mA) typ	0.15
Standby Quiescent Current (uA) typ	4.5

ZXSC400 Features

• 1.8V to 8V supply range
• Typical output regulation of 1%
• Over 80% typical efficiency
• 4.5A typical shutdown current
• Series connection for ultimate LED current matching

ZXSC400 Typical Application

• White LED backlighting for colour LCD panels
• General LED backlighting
• High performance white LED flashlights
• General LED driving from batteries

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