LA5645T - Sanyo Semiconductor

Ordering number : ENN6520

83000RM (OT) No. 6520-1/5

Overview

The LA5645T is a constant-voltage/constant-current

control IC that incorporates low-voltage operational

amplifiers and a high-precision reference voltage circuit

(VREF = 1.5 V ±1.0%). This device is optimal for use as a

secondary side controller in battery chargers, switching

regulators, and similar products.

Features

• Operating supply voltage: 2.5 to 14 V

• High-precision reference voltage: 1.5 V ±1.0%

• PC pin current: 60 mA (max)

• Current drain: 3 mA (max)

• Input offset voltage: 2 mV (max)

Package Dimensions

unit: mm

3245-MSOP8

4.9

3.0

0.65

3.0

(0.5)

(0.85)

0.5

0.25

0.08 1.1max

SANYO: MSOP8

[LA5645T]

LA5645T

SANYO Electric Co.,Ltd. Semiconductor Company

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

Constant-Voltage/Constant-Current Control IC

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.

Parameter Symbol Conditions Ratings Unit

Supply voltage VCC max 14.5 V

Differential input voltage VID max 14.5 V

Allowable power dissipation Pd max Independent IC 200 mW

Mounted on the specified printed circuit board*370 mW

PC pin current IPC max 60 mA

Operating temperature Topr –40 to +85 °C

Storage temperature Tstg –50 to +150 °C

Note: *Specified printed circuit board: 20 ×10 ×0.8 mm3, paper phenolic board.

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage Vopr 2.5 to 14 V

Operating Conditions at Ta = 25°C

No. 6520-2/5

LA5645T

ILA00181

Pd max — Ta

0.5

0.4

0.3

0.2

0.1 0.10

0.19

0.37

60 80 100–20–40 200 40

Parameter Symbol Conditions Ratings Unit

min typ max

Current drain ICC IPC = OFF 1 3 mA

Leakage current IPC LEAK VCC = VPC = 14 V 100 µA

Saturation voltage VPC (sat) IPC = 50 mA 0.5 0.7 V

Reference voltage VREF IREF = 0 mA 1485 1500 1515 mV

Reference voltage regulation

∆VREF/∆IREF

IREF = 0 to 5 mA 30 mV

[Amplifier Block] (Characteristics common to both channels A and B)

Input offset voltage VIO 0.5 2 mV

Input offset current IIO 5 50 nA

Input bias current IB80 250 nA

Voltage gain AVOpen loop gain (design guarantee*)80 dB

Common-mode input voltage range

VICM 0 VCC – 2 V

Slew rate SR Design guarantee*0.8 V/µs

Gain-bandwidth product GB Design guarantee*2 MHz

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

Note: *Design guarantee value. These parameters are not measured.

Allowable power dissipation, Pdmax — W

Ambient temperature, Ta — °C

Mounted on the specified

printed circuit board

Independent IC

Board size: 20 ×10 ×0.8 mm3

Board material: Paper phenolic

Pin Assignment

A--INPUT

A+INPUT

GND

VCC

VREF

B--INPUT

B+INPUT

VREF

ILA00182

No. 6520-3/5

LA5645T

ILA00183

ICC — Ta

400

1200

1000

800

600

100 150--50 0 50 ILA00184

ICC — VCC

1200

1000

800

600

400

200

10 150 5

VCC = 5 V Ta = 25 °C

Current drain, ICC — µA

Ambient temperature, Ta — °C Supply voltage, VCC — °C

ILA00185

VREF — IREF

1.0

2.0

1.8

1.6

1.4

1.2

20 300 10 ILA00186

VREF — VCC

1.25

1.55

1.50

1.45

1.40

1.35

1.30

10 150 5

ILA00187

VIO — Ta

--3

--2

--1

100 150--50 0 50 ILA00188

VREF — Ta

1.486

1.498

1.500

1.496

1.494

1.490

1.492

1.488

10050 150--50 0

Channel B offset

Channel A offset

VCC = 5 V VCC = 5 V

VCC = 5 V, Ta = 25 °C Ta = 25 °C

Reference voltage, VREF — V

Input offset voltage, VIO — mV

Reference voltage, VREF — V

Pin 7 output current, IREF — mA Supply voltage, VCC — V

Ambient temperature, Ta — °C

No. 6520-4/5

LA5645T

ILA00189

VPC(sat) — IPC

350

300

200

250

150

100

6040 800 20 ILA00190

VPC(sat) — Ta

600

500

400

300

200

100

50 100--50 0

ILA00191

IB — Ta

Channel A

Channel B Channel B

100

10050 150--50 0 ILA00192

IIO — Ta

--8

--2

--6

--4

10050 150--50 0

VCC = 5 V VCC = 5 V

VCC = 5 V

IPC = 50 mA

VCC = 5 V, Ta = 25 °C

Output saturation voltage, VPC(sat) — mV

Input bias current, IB— nA

Output saturation voltage, VPC(sat) — mV

Input offset current, IIO — nA

Pin PC current, IPC — mA Ambient temperature, Ta — °C

Ambient temperature, Ta — °C

ILA00193

Gain

Phase

--40

100

--180

180

--20

1M 10M1k 2 3 5 7 2 3 5 7 2 3 5 7 2 3 57

10k 100k 1M 10M1k 2 3 5 7 2 3 5 7 2 3 5 7 2 3 57

10k 100k ILA00194

Gain

Phase

--40

100

60 60

80 80

--180

180

--20

VCC = 5 V, Ta = 25 °C

Channel A Amp

100 kΩ / 1 kΩ

VCC = 5 V, Ta = 25 °C

Channel B Amp

100 kΩ / 1 kΩ

Voltage gain, VG— dB

Frequency, f — Hz Frequency, f — Hz

External resistor ratio External resistor ratio

Channel A Voltage Gain and Phase vs. Frequency Channel B Voltage Gain and Phase vs. Frequency

Phase, ø — degrees

PS No. 6520-5/5

LA5645T

Sample Application Circuit

This catalog provides information as of August, 2000. Specifications and information herein are subject to

change without notice.

Specifications of any and all SANYO products described or contained herein stipulate the performance,

characteristics, and functions of the described products in the independent state, and are not guarantees

of the performance, characteristics, and functions of the described products as mounted in the customer’s

products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,

the customer should always evaluate and test devices mounted in the customer’s products or equipment.

SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all

semiconductor products fail with some probability. It is possible that these probabilistic failures could

give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,

or that could cause damage to other property. When designing equipment, adopt safety measures so

that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective

circuits and error prevention circuits for safe design, redundant design, and structural design.

In the event that any or all SANYO products (including technical data, services) described or contained

herein are controlled under any of applicable local export control laws and regulations, such products must

not be exported without obtaining the export license from the authorities concerned in accordance with the

above law.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic or

mechanical, including photocopying and recording, or any information storage or retrieval system,

or otherwise, without the prior written permission of SANYO Electric Co., Ltd.

Any and all information described or contained herein are subject to change without notice due to

product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”

for the SANYO product that you intend to use.

Information (including circuit diagrams and circuit parameters) herein is for example only; it is not

guaranteed for volume production. SANYO believes information herein is accurate and reliable, but

no guarantees are made or implied regarding its use or any infringements of intellectual property rights

or other rights of third parties.

A B

VREF = 1.5 V ± 1%

PC (PHOTO COUPLER)

LA5645T

RSC

ILA00195

CONTROL IC

VIBattery

8 1