LINEAR TECHNOLOGY LTC4000 Technical data

60V, 20A+

TIME (HR:MIN:SEC)

0:0:00

3437404346

0:30:00

1:00:00

1:30:00

4952–0.5

CHARGE CURRENT (A)

0.0

0.5

1.0

1.5

2.0

2.5

0:15:00

0:45:00

1:15:00

V

BAT

I

BAT

LTC4000

ITH

BAT

IGATE

BGATE

GND

Buck

Boost

Buck-Boost

SEPIC

Flyback

V

IN

3V to 60V

System

I = Up to 20A+

Status

Multicell
Battery Stack

Turns Any

Switching Regulator

Into a Charger

DC/DC Converter

CHRG

VM

Battery Charging Controller

Complete Solution: PowerPath™ Control & Termination, No Software

Features

n

Input/Output Voltage: 3V to 60V

n

Charge Currents up to 20A+

n

Input Ideal Diode for Low Loss Reverse

Blocking and Load Sharing

n

Programmable Input and Charge Current:

±1% Accuracy

n

±0.2% Accurate Programmable Float Voltage

n

Programmable C/X or Timer-Based Charge

Termination

n

NTC Input for Temperature-Qualified Charging

12S 2.2Ah Li-lon Charge Curves

The LTC®4000 is a high voltage controller and power manager
which, when paired with a DC/DC converter, becomes a full­featured battery charger solution. The LTC4000 is capable
of driving virtually any topology, including buck, boost, buck­boost, SEPIC and flyback converters. Its intelligent PowerPath
manager provides power to the system load when input power
is available, enabling instant-on operation even with a deeply
discharged battery. A full-featured controller, the LTC4000 can
charge a variety of battery types including lithium, nickel and
lead acid-based chemistries. Highly accurate charge current
and float voltage, as well as onboard termination, ensure safe
and accurate charging.

L, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks and PowerPath is a trademark of Linear
Technology Corporation. All other trademarks are the property of
their respective owners.

BUCK

CONTROLLER

V

IN

V

OUT

BAT

ITH

CLN

C

L

TMRCXGND

BIAS

IN

CC

IID

IGATE

CSP

CSN

BGATE

OFB

FBG

BFB

LTC4000

BOOST

CONTROLLER

V

IN

V

OUT

BAT

ITH

CLN

C

L

TMRCXGND

BIAS

IN

CC

IID

IGATE

CSP

CSN

BGATE

OFB

FBG

BFB

LTC4000

V

IN

V

OUT

BAT

ITH

CLN

C

L

TMRCXGND

BIAS

IN

CC

IID

IGATE

CSP

CSN

BGATE

OFB

FBG

BFB

LTC4000

BUCK BOOST
CONTROLLER

•

•

V

IN

V

CC

V

CC

BAT

V

SYS

ITH

C

L

TMRCXGND

BIAS

CC

CSP

CSN

BGATE

OFB

FBG

BFB

LTC4000

FLYBACK

CONTROLLER

V

OUT

V

OUT

CLN

IID

IGATE

IN

LTC4000 – Compatible with Virtually Any Linear Technology Switching Regulator

15V to 60V Buck 10A Charger for 3-Cell LiFePO

4

18V to 72V Flyback 2A Charger for 1-Cell Li-Ion

12V to 21V Boost 10A Charger for 24V Lead Acid

6V to 36V Buck-Boost 5A Charger for 4-Cell LiFePO

4

LTC4000 Pairings Verified in Linear Technology’s Lab

IC Topology Input Voltage Range Output Voltage/Current Battery

LTC3789

LTC3789

LTC3851A

LT3845A

LT3845A

LT3845A

LTC3787

LTC3862

LTC3862

LT1952-1

LTC3805

NCP1230A

www.linear.com/4000 n 1-800-4-LINEAR

Buck-Boost 5 – 36V 14.4V/10A 4S LiFePO

Buck-Boost 9 – 30V 16.8V/5A 4S Li-Ion

Buck 5 – 38V ~4V/12A 4V Lead Acid

Buck 15 – 60V 10.8V/10A 3S LiFePO

Buck 36 – 48V 29.4V/2A 7S Li-Ion

Buck 5 – 38V ~4V/12A 4V Lead Acid

Boost 12 – 21V ~30V/10A 24V Lead Acid

Boost 10 – 20V ~55V/4A 48V Lead Acid

Boost 19 – 24V 42.5V/53.5V/5A 11/13S Li-Ion

Forward 36 – 72V 53.5V/2A 48V Lead Acid

Flyback 18 – 72V 4.2V/2A 1S Li-Ion

Flyback 110 – 220Vac 14.4V/0.3A 4S LiFePO

4

4

4

0911