SANYO LA6538T Datasheet

Ordering number : ENN6518

83000RM (OT) No. 6518-1/6

Overview

The LA6538T is optimal for use as a fan motor driver in
equipment, such as notebook personal computers and
electronic game units, that requires miniaturization and
low noise levels. This device achieves highly efficient
single-phase bipolar fan motor drive by providing a low
saturation voltage BTL output.

Functions and Features

• BTL output single-phase full-wave linear drive (gain

resistance: 180 to 500 kΩ, 360×)
— Since this device generates no switching noise, it is

optimal for fan drive in audio equipment, electronic
games, and notebook personal computers.

• Supports low-voltage operation and features a wide
usable voltage range (VCC= 2.5 to 9.5 V).

• Low saturation voltage output (Upper side + lower side
saturation voltage: VOsat(total) = 0.2 V (typ),
IO= 100 mA)
— This device achieves a high coil efficiency for low

current drain, and generates minimal heat in the IC
itself.

• Constant-voltage Hall bias output.
— The Hall element is regulated at 2.1 V, and the

device provides a stable Hall output with excellent
temperature characteristics.

• FG output
— The LA6538T provides a speed detection output (an

open-collector output).

• Built-in thermal protection circuit
— This circuit limits the drive current to prevent

damage to or destruction of the IC when the IC chip
temperature exceeds 180°C due to excessive output
current caused by load shorting or other problem.

• Ultraminiature package

(MSOP-8: 3.0 × 4.9 × 0.93 mm3)
— Allows the circuit board to be miniaturized and a

large heat sink to be used.

Reference materials:

T package (MSOP-8) series fan motor drivers
LB1964T: 3 and 5 V operation, low saturation voltage

switching single-phase bipolar drive, FG output
LB11963T: 5 and 12 V operation, switching single-

phase bipolar drive, restart circuit, lock detection, 1/2
FG output

LB11964T: 5 and 12 V operation, switching single­phase bipolar drive, restart circuit, lock detection, FG
output

Package Dimensions

unit: mm

3245-MSOP8

4.9

3.0

0.65

3.0

(0.5)

(0.85)

0.5

0.25

14

85

0.25

0.08

1.1max

SANYO: MSOP8

[LA6538T]

LA6538T

SANYO Electric Co.,Ltd. Semiconductor Company

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

Single-Phase Full-Wave Fan Motor Driver

Monolithic Linear IC

Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.

SANYO 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 SANYO products described or contained
herein.

No. 6518-2/6

LA6538T

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

CC

max 10 V
Allowable power dissipation Pd max Mounted on the specified printed circuit board* 400 mW
OUT pin output current I

OUT

max 0.3 A
OUT pin output voltage handling V

OUT

max 9.5 V

FG output voltage handling V

FG

max 10 V
FG output current I

FG

max 5mA
Operating temperature Topr –20 to +90 °C
Storage temperature Tstg –55 to +150 °C

Note: * Specified printed circuit board: 20.0 ×10.0 × 0.8 mm3paper phenolic board, wiring density: 20%.

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Supply voltage V

CC

2.5 to 9.5 V

Hall input common-mode input voltage range V

ICM

0.9 to VCC– 1 V

Recommended Operating Conditions at Ta = 25°C

ILA00211

Pd max — Ta

0

600

500

300

400

100

200

192

80 1000--20 20 40 60

Allowable power dissipation, Pdmax — mW

Ambient temperature, Ta — °C

Mounted on the specified
printed circuit board

Specified printed circuit board:

20.0 × 10.0 × 0.8 mm

3

Paper phenolic board

Parameter Symbol Conditions

Ratings

Unit

min typ max

Circuit current I

CC

IN–= 2.6 V, IN+= 2.4 V, RL= ∞ 10 15 mA

OUT pin output low-level voltage V

O

LIO= 100 mA 0.1 0.2 V

OUT pin output high-level voltage V

O

HIO= 100 mA 0.1 0.2 V

Hall bias voltage V

HB

RH = 360 Ω + 91 Ω 1.9 2.1 2.3 V
Hall amplifier gain VG 47 50 53 dB
Hall amplifier input resistance V

INR

400 500 620 Ω

FG output low-level voltage V

FG

IFG= 3 mA 0.2 0.3 V
FG output leakage current I

FGL

VFG= 7 V 30 µA
Thermal protection circuit T-TSD Design guarantee* 150 180 200 °C

Electrical Characteristics at Ta = 25°C, VCC= 5 V

Note: * Design guarantee: Indicates a design target value. These parameters are not tested in the independent IC.

Truth Table

IN

–

IN

+

OUT1 OUT2 FG Mode

HLHLL

Motor operating

LHLHoff

— — off off — Thermal protection activated