LT3487| Datasheet

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FEATURES

LT3487 Boost and Inverting Switching Regulator for CCD Bias DESCRIPTIO
The LT 3487 dual channel switching regulator generates positive and negative outputs for biasing CCD imagers. The device delivers up to 8V at 90mA and 15V at 45mA from a lithium-ion cell, providing bias for many popular CCD imagers. The boost regulator incorporates output disconnect technology to eliminate the DC current path from VIN to the output load that is present in standard boost configurations. The 2MHz switching frequency allows CCD solutions using tiny, low profile capacitors and inductors and generates low noise outputs that are easy to filter. Schottky diodes are internal and the output voltages are set with one resistor per channel, reducing the external component count. Intelligent soft-start allows sequential soft-start of the two channels with a single capacitor. The soft-start is sequenced such that the output ramp of the negative channel begins after the ramp of the positive channel. Internal sequencing circuitry also disables the negative channel until the positive channel has reached 87%
of its final value, ensuring that the sum of the two outputs is always positive. The LT3487 is available in a 10-pin 3mm 3mm DFN package.

Generates 15V at 45mA, 8V at 90mA from a Li-Ion Cell Output Disconnect Sequencing: Positive Output Reaches Regulation Before Negative Channel Begins Switching Internal Schottky Diodes 2MHz Constant Switching Frequency Requires Only One Resistor per Channel to Set Output Voltages VIN Range: 2.3V to 16V Output Voltage Up to 28V Short-Circuit Robust Capacitor Programmable Soft-Start Separate VBAT Pin Allows Separate Sources for Power and Control Circuitry Available in 10-Lead (3mm 3mm) DFN Package

APPLICATIO S

CCD Bias TFT LCD Bias OLED Bias Rail Generation for Op Amps

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO
2.2uF VIN 3V TO 12V 1uF DN 47pF 15uH VNEG 8V 90mA 22uF FBN 324k RUN/SS 100nF RUN/SS SWN VIN

15uH

10uH

VBAT

SWP 70 EFFICIENCY (%) CAP 549k FBP 4.7uF 100nF 65 60 55 50 VPOS VPOS 15V 45mA 45 40 VIN = 3.6V 0 20 80 60 LOAD CURRENT (mA) 40 100
3487 TA01b

LT3487

GND
3487 TA01a

U

U

U

Conversion Efficiency
80 75 POS CHANNEL AT CAP

POS CHANNEL AT VPOS NEG CHANNEL

3487f

1

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LT3487 DATASHEET