ETA3001

www.eta-semi.com

7

Empower, Transcend, Achieve!

ETA3001 Rev 1.2

TYPICAL PERFORMANCE CHARACTERISTICS Cont’d

(TA=25

C, unless otherwise specified)

VTOP plug-out, UP Condition, RS = 50mΩ,

VBOT = 4.3V, VTOP = 3.5V

VBOT plug-out, UP Condition, RS = 50mΩ,

VBOT = 4.3V, VTOP = 3.5V

FEATURE DESCRIPTION

The ETA3001 is a battery cell balancer with lossless inductive architecture based on ETA’s proprietary

technology. The technology is developed by ETA Solutions and any copy without ETA‘s agreement will be

forbidden.

During operation, ETA3001 detects the difference between 2 cells then start balancing if the difference

exceeds VKICK. Once detected VKICK, ETA3001 will discharge the higher voltage cell, store that discharging

energy in the inductor then charge that energy to the lower voltage cell. ETA3001 keeps balancing until

there is no difference between 2 cells.

ETA3001 technology allows balancing in either charge or discharge phases of the battery with minimized

loss.Without unbalanced condition, ETA3001 operates in sleep mode with low supply current. This is an

advantage to extend battery pack life time.

STATE MACHINE

The ETA3001 provides a completed state machine

that controls whole operation intelligently. With this

state machine, ETA3001 is equipped with self-

protection from any accident during balancing. It also

keeps the part stay asleep as much as possible until

unbalance detected.

ETA3001 always starts from CHECK state when

battery is plugged in.

Any fault always forces ETA3001 back to SLEEP

State where ETA3001 burns only 2µA (typically) from

BATP.

Figure 3:

State Machine Diagram

SLEEP

STATE

CHECK

STATE

BALANCE

STATE

TSLEEP

Expired

TCHECK

Expired

TALLOW Expired and

Unbalance Detected

TSD or OVP

Skipping and

TDONE Expired

VBATP < UVLO

Any State

SW

BATP

BATC

ISW

SW

BATP

BATC

ISW