Sanyo LB8108M Specifications

Ordering number : EN4946A

73196RM/51795TH (OT) No. 4946-1/12

Applications

The LB8108M is an actuator driver for use in portable CD players that operate at a power supply voltage of 2.4 (two nicad batteries) or 3.0 V (two dry-cell batteries).

Functions and Features

• Includes four H bridge driver channels to drive the four CD player actuators (focus coil, tracking coil, spindle motor and sled motor). (output dynamic range: maximum of about 2 V)

• Includes a 3.9 V (typical) step-up circuit to supply the DSP, ASP and microprocessor used in the CD player. Also includes another voltage step-up circuit whose voltage can be set with external resistors. (However, note that the transistors, inductors, capacitors and diodes required for drive operation are all external components.)

• Built-in oscillator circuit for these converters (external resistor and capacitor required)

• Detects the maximum value of the four driver outputs and supplies a voltage slightly higher than that voltage to the H bridge block in each of the four channels using PWM voltage converter. This allows a drive scheme with extremely low loss to be implemented. (However, note that the pnp transistor, inductor, capacitor, and diodes for the PWM circuit are all external components.)

• Built-in laser diode drive and APC circuits (IOmax ≈ 100 mA. This function can be turned off by a control voltage input. It is composed of step-up converter and series regulator. However, note that the transistors, inductors, capacitors and diodes required for drive operation are all external components.)

• The sled motor drive circuit operates in 2 modes, that are normal V-type drive mode and step drive mode which is highly effective in reducing power dissipation.

• A step-down converter that convert external input voltage that exceed 5 V into 3.5 V VCCoperates when an external voltage input is applied. This simplifies power supply design and thermal design for applying VCC. (This circuit turns on at the same time an external voltage is applied and generates a 3.5 V VCC, which is utilize for nicad battery charging.)

• Built-in microprocessor reset circuit (external capacitor required) (This circuit detects the VCDpin voltage and operates a reset voltage with an H-side of 2.2 V (typical) and an Lside of 2.1 V (typical).)

• Two built-in battery check comparator channels

• System start and stop under microprocessor control

• Actuator muting function included. (all four channels at the same time)

• Built-in thermal shutdown circuit

Package Dimension

unit: mm

3148-QFP44MA

SANYO: QIP44MA

[LB8108M]

LB8108M

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

Actuator Driver for Portable CD Players

Monolithic Digital IC

Specifications

Absolute Maximum Ratings at Ta = 25°C

Allowable Operating Ranges at Ta = 25°C

Electrical Characteristics at Ta = 25°C, VCC= 3 V

No. 4946-2/12

LB8108M

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

max 7 V

External input voltage V

EXT

max 9 V

H bridge output current I

OUT

max Taking 400 mA per channel as the maximum. 800 mA

Step-up circuit output current I

max 150 mA Allowable power dissipation Pd max Independent IC 900 mW Operating temperature Topg –20 to +75 °C Storage temperature Tstg –55 to +150 °C

Parameter Symbol Conditions Ratings Unit

Supply voltage V

1.6 to 3.5 V

External input voltage V

EXT

5.0 to 8.0 V

Parameter Symbol Conditions min typ max Unit [Power Supply Block] Standby current drain I

CCO

S/S = high 100 µA

Quiescent current I

S/S = low, with no drive input 16 25 mA [Step-up Circuit (3.9 V)] Step-up output voltage V

3.7 3.9 4.1 V

NPN drive current I

D CD

3.0 mA

Load regulation R

LD CD

1000 mV/A

Line regulation R

LN CD

100 mV/V

Minimum off duty D

MIN CD

50 % [Externally Set Step-Up Circuit] NPN drive current I

D UP

3.0 mA

Input bias current I

B UP

200 nA

Minimum off duty D

MIN UP

50 % [H Bridge Output Block, PWM Block] Output saturation voltage V

H satIO

= 200 mA, TOP + BOTTOM 0.30 0.45 V

Maximum output voltage V

PWM

max 2.25 V

PNP drive current I

D PWM

OUT

/600 mA

Load regulation R

LD PWM

1000 mV/A

Line regulation R

LN PWM

100 mV/V [Drive Control Block] Input bias current I

B IN

2.0 µA

ASP reference input voltage range V

ASPR

1.2 VCD– 1.3 V

Transfer gain G

For RL= 10 Ω 7.95 dB

Transfer gain difference (+/-) ∆G

For RL= 10 Ω –1.0 0 +1.0 dB

Input dead zone voltage V

–30 0 +30 mV [Sled Drive Circuit] SLREF input voltage range V

SLREF

VCD– 0.5 V

Input bias current I

B SLED

200 nA

SLM on voltage V

SLM

2.0 V [Oscillator Block] Oscillator power output voltage V

OSCP

VCC– 0.15 V

Oscillator maximum frequency F

MAX

100 kHz

OSC pin input bias current I

B OSC

–2.0 µA

Continued on next page.

Continued from preceding page.

Note: 1. V

HSENSE

and V

LSENSE

will never be inverted in any individual IC.

2. Items specified to be a design target value in the conditions column are not measured.

No. 4946-3/12

LB8108M

Parameter Symbol Conditions min typ max Unit [Battery Check Block] BI1 and BI2 input bias current I

B BI1, 2

200 nA

BO1 and BO2 output

BO1, 2

For IO= 500 µA 0.3 V

saturation voltage [S/S Pin Function] S/S start voltage V

SS ON

VCC– 1.0 V

S/S off voltage V

SS OFF

VCC– 0.5 V [External Voltage Input Block] Minimum operating input voltage V

I EXT

5.0 V

PNP drive current I

D EXT

3.0 mA

Step-down circuit output voltage V

O EXT

3.3 3.5 3.7 V [Muting Block] Muting on voltage V

MUTE

2.0 V [APC Circuit Block] Maximum output current I

O APC

100 mA

LDCTL pin input bias current I

B LDC

–5.0 µA

LDCTL off voltage V

LDOFF

0.4 V

MDin pin input bias current I

B MDIN

–1.0 µA

VLD step-up voltage V

LDOUT

Taking V

LDO

as the reference 0.3 V

NPN drive current I

D LDO

1.0 mA [Reset Circuit Block] Reset charge current I

CHG

–1.25 µA

Output saturation voltage V

RST

For IO= 100 µA 0.3 V

H side detection voltage V

HSENSE

For the VCDpin voltage

2.1 2.2 2.3 V

L side detection voltage V

LSENSE

For the VCDpin voltage

2.0 2.1 2.2 V [TSD Block] TSD operating temperature T

TSD

Design target value

180 °C

TSD temperature hysteresis ∆T

TSD

Design target value

20 °C

Pin Assignment

No. 4946-4/12

LB8108M

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