NPC SM8145AB Datasheet

SM8145A

NIPPON PRECISION CIRCUITS INC.

Dual EL Driver

OVERVIEW

The SM8145A is an Electro Luminescent (EL) driver IC that can drive two EL displays simultaneously.

Each EL display mode ON/OFF function can be separately controlled using two enable (ENA) pins.

The luminance in each display mode can be adjusted, enabling the luminance and consumption current to be
optimized to match the application. The device is supplied in ultra-small leadless QFN-20 packages, making
driver circuit miniaturization possible.

FEATURES

■

2 separate EL display drivers

■

2-display simultaneous driver operation

■

Adjustable luminance and current consumption in
each mode

■

3 display modes and a standby mode select control
pins (ENA1, ENA2)
1 to 30cm

■

1.6 to 5.5V supply voltage

■

200 Vp-p maximum EL driver voltage

■

20-pin QFN ultra-small leadless package

■

High voltage CMOS Process

■

2

EL display size per channel

APPLICATIONS

■

Mobile phone

■

PDA, Handheld PC

■

Illumination accessory

PINOUT

(Top view)

OUTCOM

N.C.

OUT1

N.C.

CHV

OUT2

15 14 13 12 11

16

17

18

8145A

19
20

12345

LDR

N.C.

N.C.

VDD

N.C.

VSS

N.C.

ENA1

10

9

8
7
6

OCL1

ENA2
OCE
OCL3
N.C.
OCL2

ORDERING INFORMATION

De vice Pack ag e

SM8145AB 20-pin QFN

PACKAGE DIMENSIONS

(Unit : mm)

Weight : 0.037g

4.20 ± 0.20

4.00 ± 0.10

1115

16

4.00 ± 0.10

4.20 ± 0.20

20

15

0.50

0.22 ± 0.05

10

6

+ 0.03

0.05

M

0.05

NIPPON PRECISION CIRCUITS—1

0.02 − 0.02

0.60 ± 0.10

0.22

1.00max

BLOCK DIAGRAM

SM8145A

V

IC VBOOST

PIN DESCRIPTION

VDD CHVLDR

Divider

Oscillator

OCL2OCL1 OCL3

ROCL2ROCL1 ROCL3

EL 1

OUT1

High Voltage Switching Circuit

Control logic

ENA1

ENA2

EL 2

OUTCOM

Divider

Oscillator

OCE

OUT2

R

OCE

VSS

Pin number Name I / O Function

1 L D R O Booster coil driver output
2 N. C. – No connection (must be open)
3 VSS – Ground
4 N. C. – No connection (must be open)
5 OCL1 I Coil driver oscillator 1 (oscillator frequency determined by external resistor)
6 OCL2 I Coil driver oscillator 2 (oscillator frequency determined by external resistor)
7 N. C. – No connection (must be open)
8 OCL3 I Coil driver oscillator 3 (oscillator frequency determined by external resistor)

9 O CE I EL d river oscillator (oscillator frequency determined by exter nal resistor)
10 ENA2 Ip
11 ENA1 Ip

1

Enable input 2 (HIGH: enable, LOW : disable)

1

Enable input 1 (HIGH: enable, LOW : disable)
12 N.C. – No connection (must be open)
13 V D D – Supply
14 N.C. – No connection (must be open)
15 OU T 2 O Output 2
16 O U T C O M O Output (common)
17 N.C. – No connection (must be open)
18 OU T 1 O Output 1
19 N.C. – No connection (must be open)
20 CHV I High-voltage DC input

1. Built-in pull-down resistor.

NIPPON PRECISION CIRCUITS—2

C

SM8145A

SPECIFICATIONS

Absolute Maximum Ratings

Parameter Sym bol Condition Rating Unit

Supply voltage range V
Input voltage range V

V

Output voltage

V

V

OUT1/2/COM

Po w er dissipation P

Storage temperature range T

DD

IN

CHV

LDR

D

STG

All Input pins V
CHV pin 0.5 to 120 V
LDR pin 0.5 to 120 V
OUT1, OUT2, OUTCOM pin 0.5 to 120 V
T

≤

70

°

C 140 m W

a

T

≤

85

°

C 100 m W

a

−

0.3 to 7.0 V

−

SS

0.3 to V

−

+ 0.3 V

DD

55 to 125

°

Recommended Operating Conditions

Parameter Sym bol Condition

Supply voltage range V
Ope rating temperature T

Op e rating current

1

Coil inductance L

1. Max value is as same as Absolute Maximum Ratings.

DD2

OPR

I

DD2

LDR

Including coil current, V
Including coil current, V
Including coil current, V
Including coil current, V
f

= 64 kHz – 0.47 – m H

LDR

DD

DD

DD

DD

=

3.0V, T

=

5.0V, T

=

3.0V, T

=

5.0V, T

Rating

min typ max

1.6 3.0 5.5 V

−

40 – 85

≤

70

°

C– – 85 mA

a

≤

70

°

C– – 51 mA

a

≤

85

°

C– – 60 mA

a

≤

85

°

C– – 36 mA

a

Unit

°

C

NIPPON PRECISION CIRCUITS—3