ZXSC310E5TC datasheet, PDF - EEWORLD Datasheet

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ZXSC310E5TC: DescriptionLED Driver, 1-Segment, PDSO5, SOT-23, 5 PIN; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size308KB，16 Pages; ManufacturerZetex Semiconductors; Websitehttp://www.zetex.com/

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ZXSC310E5TC Overview

LED Driver, 1-Segment, PDSO5, SOT-23, 5 PIN

ZXSC310E5TC Parametric

Parameter Name	Attribute value
Maker	Zetex Semiconductors
package instruction	LSSOP,
Reach Compliance Code	unknow
ECCN code	EAR99
Interface integrated circuit type	LED DISPLAY DRIVER
JESD-30 code	R-PDSO-G5
JESD-609 code	e3
length	2.9 mm
Humidity sensitivity level	1
Multiplex display function	NO
Number of functions	1
Number of segments	1
Number of terminals	5
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	LSSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.45 mm
Maximum supply voltage	8 V
Minimum supply voltage	0.8 V
Nominal supply voltage	1.5 V
surface mount	YES
Temperature level	INDUSTRIAL
Terminal surface	MATTE TIN
Terminal form	GULL WING
Terminal pitch	0.95 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	40
width	1.625 mm
minfmax	0.2 MHz

ZXSC310E5TC Preview

ZXSC310

LED DRIVER SOLUTION FOR LCD BACKLIGHTING

DEVICE 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 5µA, 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.

FEATURES

94% efficiency

Minimum operating input voltage 0.8V

Maximum operating input voltage 8V

Standby current less than 5µA

Programmable output current

Series or parallel LED configuration

Low saturation voltage switching transistor

SOT23-5 package

TYPICAL APPLICATIONS CIRCUIT

APPLICATIONS

LCD backlights:

Digital still camera

PDA

Mobile phone

LED flashlights and torches

White LED driving

Multiple LED driving

= 3 .3 V / 5 V

D R IV E

TDN

SENSE

G ND

ORDERING INFORMATION

DEVICE

REEL

SIZE

ZXSC310E5

180mm

TAPE

WIDTH

8mm

QUANTITY

PER REEL

3000

DEVICE MARKINGS

C310

ISSUE 1 - SEPTEMBER 2002

ZXSC310

ABSOLUTE MAXIMUM RATINGS:

Supply Voltage

Maximum Voltage other pins

Power Dissipation

Operating Temperature

Storage Temperature

ELECTRICAL CHARACTERISTICS:

-0.3 to 10V

-0.3 to V

+0.3V

450mW

-40 to 85 °C

-55 to 125°C

Test conditions unless otherwise stated: V

=1.5V, T

AMB

=25 C

Symbol

Parameter

Efficiency

CC(min)

Conditions

Min

Typ

Max

Units

Recommended supply

voltage range

Minimum startup and

operating voltage

Quiescent current

Base drive current

Supply current

0.8

DRIVE

=-600µA

DRIVE

=0.7V

DRIVE

=-600µA, V

DRIVE

=0.7V,

AMB

=-10°C3

EN =

(enabled)

EN =

0V (standby)

DRIVE

= 0.7V, V

ISENSE

= 0V

DRIVE

= 0.7V, V

ISENSE

= 0V

ISENSE

= 0V, I

VDRIVE

=-0.5mA

ISENSE

= 50mV, I

VDRIVE

= 5mA

1.5

0.8

0.9

0.2

0.92

VDRIVE

VDRIVE(high)

VDRIVE(low)

STDN(high)

STDN(low)

STDN

ISENSE

(threshold)

3.5

µA

High level drive voltage

Low level drive voltage

Device enabled

Device in standby mode

Enable input current

Output current reference

voltage

SENSE

voltage temp co.

SENSE

input current

-0.3

0.7

0.2

0.15

-1

0.4

ISENSE

= 0V

-30

-65

µA

%/°C

µA

CVISENSE

ISENSE

ELECTRICAL CHARACTERISTICS: AC PARAMETERS

Test conditions unless otherwise stated: V

=1.5V, T

AMB

=0 to 70 C

Symbol

DRV

OSC

Parameter

Discharge Pulse Width

Recommended operating

frequency

Conditions

Min

1.2

Typ

1.7

Max

3.2

200

Units

µs

kHz

1 Application dependent, see reference designs

2 These parameters guaranteed by Design

3 Total supply current =I

+ I

VDRIVE

, see typical characteristics

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

ISSUE 1 - SEPTEMBER 2002

ZXSC310

FMMT618

For the circuits described in the applications section

Zetex FMMT618 is the recommended pass transistor.

The following indicates outline data for the device,

more detailed information can be found in the Zetex

surface mount products data book or on Zetex Web

page: www.zetex.com

ELECTRICAL CHARACTERISTICS:

Test conditions unless otherwise stated: T

AMB

=25 C

Symbol

CE(sat)

Parameter

Collector-Emitter

Saturation Voltage

Conditions

=0.1A, I

=10mA

=1A, I

=10mA

=2.5A, I

=50mA

(BR)CEO

Min

Typ

130

Max

150

200

Units

Collector-Emitter

Breakdown Voltage

=10mA

Measured under pulse conditions. Pulse width=300µs. Duty cycle

ZHCS1000

For the maximum brightness circuit described in the

a p pl i c at i o ns s ect i on Ze t e x Z H C S1 0 0 0 i s t h e

recommended Schottky diode.

The following indicates outline data for the ZHCS,

more detailed information can be found on Zetex Web

page: www.zetex.com

ELECTRICAL CHARACTERISTICS:

Test conditions unless otherwise stated: T

AMB

=25 C

Symbol

Parameter

Forward voltage

Reverse Recovery Time

Conditions

= 500mA

= 1A

Switched from I

=500mA to

=500mA.

Measured at I

=50mA

Reverse Current

= 30V

100

µA

Min

Typ

Max

400

500

Units

Part

Number

Max.

200

2000

1000

750

500

400

FSM

Max.

0.6

6.75

Max.

500

540

550

500

2000

1000

750

500

400

Max.

250

1000

100

Capacitance

at V

= 25V, f = 1MHz

Typ.

Package

SOT23

SOT23-6

SOT23

SOT323

BAT54

ZHCS2000

ZHCS1000

ZHCS750

ZHCS500

ZHCS400

ISSUE 1 - SEPTEMBER 2002

ZXSC310

TYPICAL CHARACTERISTICS

ISSUE 1 - SEPTEMBER 2002

ZXSC310

DEVICE DESCRIPTION

The ZXSC310 is PFM, controller IC which, when

combined with a high performance external transistor,

enables the production of a high efficiency boost

converter for LED driving applications. A block

diagram is shown for the ZXSC310 below.

The on chip comparator forces the driver circuit and

therefore the external switching transistor off if the

voltage at I

SENSE

exceeds 19mV. An internal reference

circuit and divider set this threshold.

The voltage at I

SENSE

is taken from a current sense

resistor connected in series with the emitter of the

switching transistor. A monostable following the

output of the comparator forces the turn-off time of the

output stage to be typically 1.7us. This ensures that

there is sufficient time to discharge the inductor coil

before the next on period.

With every on pulse the switching transistor is kept on

until the voltage across the current-sense resistor

exceeds the threshold of the I

SENSE

input. The on-pulse

length, and therefore the switching frequency, is

determined by the programmed peak current, the input

voltage and the input to output voltage differential. See

applications section for details.

The driver circuit supplies the external switching

transistor with a fixed drive current. To maximise

efficiency the external transistor switched quickly,

typically being forced off within 30ns.

C C

T D N

D RIVE

D R IV E

S E N S E

ZXSC310 Block Diagram

ISSUE 1 - SEPTEMBER 2002

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ZXSC310E5TC Related Products

	ZXSC310E5TC	UZXSC310E5
Description	LED Driver, 1-Segment, PDSO5, SOT-23, 5 PIN	LED Driver, 1-Segment, PDSO5, SOT-23, 5 PIN
Maker	Zetex Semiconductors	Zetex Semiconductors
package instruction	LSSOP,	SOT-23, 5 PIN
Reach Compliance Code	unknow	unknown
ECCN code	EAR99	EAR99
Interface integrated circuit type	LED DISPLAY DRIVER	LED DISPLAY DRIVER
JESD-30 code	R-PDSO-G5	R-PDSO-G5
JESD-609 code	e3	e3
length	2.9 mm	2.9 mm
Humidity sensitivity level	1	1
Multiplex display function	NO	NO
Number of functions	1	1
Number of segments	1	1
Number of terminals	5	5
Maximum operating temperature	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	LSSOP	LSSOP
Package shape	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	260	260
Certification status	Not Qualified	Not Qualified
Maximum seat height	1.45 mm	1.45 mm
Maximum supply voltage	8 V	8 V
Minimum supply voltage	0.8 V	0.8 V
Nominal supply voltage	1.5 V	1.5 V
surface mount	YES	YES
Temperature level	INDUSTRIAL	INDUSTRIAL
Terminal surface	MATTE TIN	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING
Terminal pitch	0.95 mm	0.95 mm
Terminal location	DUAL	DUAL
Maximum time at peak reflow temperature	40	40
width	1.625 mm	1.625 mm
minfmax	0.2 MHz	0.2 MHz

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