©2014 Advanced Linear Devices, Inc., Vers. 2.0

www.aldinc.com

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EPAD

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GENERAL DESCRIPTION

The ALD810021/ALD910021 are members of the ALD8100xx

(quad) and ALD9100xx (dual) family of Supercapacitor Auto Bal-

ancing MOSFETs, or SAB™ MOSFETs. SAB MOSFETs are built

with production proven EPAD

dress voltage and leakage-current balancing of supercapacitors

connected in series. Supercapacitors, also known as ultracapacitors

or supercaps, connected in series can be leakage-current balanced

by using a combination of one or more devices connected across

each supercapacitor stack to prevent over-voltages.

The ALD810021 offers a set of unique, precise operating voltage

and current characteristics for each of four SAB MOSFET devices,

as shown in its Operating Electrical Characteristics table. It can be

used to balance up to four supercapacitors connected in series.

The ALD910021 has its own set of unique precision Operating Elec-

trical Characteristics for each of its two SAB MOSFET devices,

suitable for up to two series-connected supercapacitors.

Each SAB MOSFET features a precision gate threshold voltage in

istic and results in an effective variable resistor that varies in value

supercapacitor in a series, balances each supercapacitor to within

its voltage and current limits.

0.01µA. Hence, when an ALD810021/ALD910021 SAB MOSFET

is connected across a supercapacitor that charges to less than

1.90V, it would dissipate essentially no power.

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ALD810021/ALD910021

FEATURES & BENEFITS

• Simple and economical to use

• Precision factory trimmed

• Automatically regulates and balances leakage currents

• Effective for supercapacitor charge-balancing

• Balances up to 4 supercaps with a single IC package

• Balances 2-cell, 3-cell, 4-cell series-connected supercaps

• Scalable to larger supercap stacks and arrays

• Near zero additional leakage currents

• Zero leakage at 0.3V below rated voltages

• Balances series and/or parallel-connected supercaps

• Leakage currents are exponential function of cell voltages

• Active current ranges from <0.3nA to >1000µA

• Always active, always fast response time

• Minimizes leakage currents and power dissipation

*IC pins are internally connected, connect to V-

PIN CONFIGURATIONS

SAL PACKAGE

ALD910021

V-

1

2

3

4

IC*

V+

6

7

8

5

SCL PACKAGE

ALD810021

IC*

V-

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

IC*

V+

V-

V-

M2

M1

M4

M3

V-

V-

APPLICATIONS

• Series-connected supercapacitor cell leakage balancing

• Energy harvesting

• Long term backup battery with supercapacitor outputs

• Zero-power voltage divider at selected voltages

• Matched current mirrors and current sources

• Zero-power mode maximum voltage limiter

• Scaled supercapacitor stacks and arrays

PRODUCT FAMILY SPECIFICATIONS

For more information on supercapacitor balancing, how SAB

MOSFETs achieve automatic supercapacitor balancing, the device

characteristics of the SAB MOSFET family, product family product

selection guide, applications, configurations, and package infor-

mation, please download from www.aldinc.com the document:

“ALD8100xx/ALD9100xx Family of Supercapacitor Auto Balanc-

ing (SAB™) MOSFET ARRAYs”

Operating Temperature Range

Package

0°C to +70°C

-40°C to +85°C

(Commercial)

(Industrial)

16-Pin SOIC

ALD810021SCL

ALD810021SCLI

8-Pin SOIC

ALD910021SAL

ALD910021SALI