L5030_15 [UTC]

BOOST-UP VOLTAGE CONVERTER FOR LED DRIVER;


型号：	L5030_15
厂家：	Unisonic Technologies
描述：	BOOST-UP VOLTAGE CONVERTER FOR LED DRIVER 驱动
文件：	总6页 (文件大小：198K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UNISONIC TECHNOLOGIES CO., LTD

L5030

LINEAR INTEGRATED CIRCUIT

BOOST-UP VOLTAGE

CONVERTER FOR LED

DRIVER

DESCRIPTION

The L5030 is a high efficiency boost converter operating in

current loop, based on a PFM mode to drive LEDs. The

current mode regulation allows the uniform brightness of

LEDs. The wide application of L5030 makes it suitable for

many types of battery applications such as Li-ions, Alkaline,

or Sealed Lead Acid battery. The combination of few external

components and small package size keeps the converter

board area to a minimum in space-restricted applications.

FEATURES

* Inductor based converter brings up to 92% efficiency

* +0.8V to +8.0V input voltage range

* 0.92V guaranteed start up input voltage

* Boost up control using PFM

* Constant output current regulation

ORDERING INFORMATION

Ordering Number

Lead Free

Package

SOT-25

Packing

Halogen Free

L5030L-AF5-R

L5030G-AF5-R

Tape Reel

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L5030

LINEAR INTEGRATED CIRCUIT

MARKING

PIN DESCRIPTIONS

PIN NO.

SYMBOL

V_CC

I/O

DESCRIPTION

Supply voltage

Ground

GND

No connection

Current sense input

I_SENSE

Output drive for external switching transistor. Connected to the base of external

switching transistor.

V_DRIVE

BLOCK DIAGRAM

19mV

V_REF

V_DRIVE

ON/OFF Time

Control

I_SENSE

Driver

Oscillator

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L5030

LINEAR INTEGRATED CIRCUIT

DEVICE DESCRIPTION

The UTC L5030 is designed to supply a constant current to the external load, the circuit be powered a battery

supply. An external transistor is required for LED application. The UTC L5030 guarantees the start up voltage as low

as 0.92V and remains operation down to 0.8V.

The basic structure of UTC L5030 is a step-up DC/DC converter. It offers a Pulse Frequency Modulation (PFM)

operation, which controls the constant OFF time (1.7μs typically) for external transistor at the 200KHz maximum

frequency.

The external switching transistor is ON and kept on until the voltage across the current-sense resistor which is

connected in series with the emitter of the switching transistor exceeds the I_SENSEinput threshold (19mV). The

transistor is shut OFF and the energy stored in inductor is discharged when I_SENSEinput threshold exceeds 19mV.

Once the discharge cycle is completed, the external transistor is ON again. This charging and discharging sequence

will repeat and trigger the external transistor regardless the inductor current value.

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L5030

LINEAR INTEGRATED CIRCUIT

ABSOLUTE MAXIMUM RATINGS (T_A= 25℃, unless otherwise specified)

PARAMETER

SYMBOL

V_CC

RATINGS

-0.3 ~ 10

UNIT

Supply Voltage

Input Voltage

-0.3 ~ V_CC+0.3

450

Power Dissipation

P_D

°C

Operating Temperature

Storage Temperature

T_OPR

T_STG

-40 ~ +85

-55 ~ +125

°C

Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.

Absolute maximum ratings are stress ratings only and functional device operation is not implied.

ELECTRICAL CHARACTERISTICS (V_CC=1.5V)

PARAMETER SYMBOL TEST CONDITIONS

DC PARAMETERS (T_A=25°C, unless otherwise specified.)

MIN

0.8

TYP MAX UNITS

Recommended Supply Voltage

Minimum Startup Voltage

V_CC

V_SU(MIN)I_DRIVE=-600μA, V_DRIVE=0.7V

0.8

0.92

V_CC

0.25

High

Low

V_ISENSE= 0V, I_VDRIVE=-0.5mA

V_VDRIVE

V_CC-0.3

Drive Voltage

V_ISENSE= 50mV, I_VDRIVE= 5mA

I_SENSEThreshold Voltage

Efficiency(Note 1)

V_ISENSE

Quiescent Current(Note 2)

V_DRIVEOutput Current

Supply Current(Note 3)

I_SENSEVoltage Temp Co.(Note 2)

I_SENSEInput Current

I_Q

0.2

%/°C

μA

I_VDRIVE

I_CC

T_CVISENSE

I_ISENSE

V_DRIVE= 0.7V, V_ISENSE= 0V

V_DRIVE= 0.7V, V_ISENSE=0V

1.5

3.6

0.4

-30

V_ISENSE= 0V

-65

AC PARAMETERS(Note 2) (T_A= 0 ~ 70°C, unless otherwise specified)

Discharge Pulse Width

T_DRV

F_OSC

1.2

1.7

3.2

μs

PFM Operating Frequency (Note 4)

350

kHz

Note 1. The application dependent, please see reference designs.

2. These parameters are guaranteed by design.

3. See typical characteristics. The total supply current =I_Q+ I_VDRIVE

4. See applications section. Operating frequency is application circuit dependent.

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L5030

LINEAR INTEGRATED CIRCUIT

TYPICAL APPLICATION CIRCUITS

The UTC L5030 provides portable and multiple LEDs applications.

Solution for portable application

Solution for multiple LEDs application

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L5030

LINEAR INTEGRATED CIRCUIT

TYPICAL CHARACTERISTICS

Quiescent Current vs. Input Voltage

Drive Current vs. Input Voltage

300μ

200μ

100μ

Input Voltage (V)

UTC assumes no responsibility for equipment failures that result from using products at values that

exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or

other parameters) listed in products specifications of any and all UTC products described or contained

herein. UTC products are not designed for use in life support appliances, devices or systems where

malfunction of these products can be reasonably expected to result in personal injury. Reproduction in

whole or in part is prohibited without the prior written consent of the copyright owner. The information

presented in this document does not form part of any quotation or contract, is believed to be accurate

and reliable and may be changed without notice.

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