EC3655|High Efficiency,3A, Multi-Cells Li-Ion Battery Charger

EC3655|High Efficiency,3A, Multi-Cells Li-Ion Battery Charger


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​​ High Efficiency,3A, Multi-Cells Li-Ion Battery Charger

EC3655

 

 

 

 

DESCRIPTION

The EC3655 is a buck boost converter targets HVDC fast charging system. The EC3655 supports 1 to 3 cells

Li-ion battery, the full charge voltage and charge current can be programmed through external resistor.

The EC3655 implements the Buck Boost converter with an H-bridge. The integrated low RDS(on)  MOSFET minimizes physical footprint, maximizes charge efficiency. Built-in loop compensation simplifies the circuit and

design. PFM is engaged to maintain high efficiency at light load current. EC3655 guarantees robustness with thermal protection and battery under voltage lockout.

 

Features

Integrate low RDS(on) power MOSFET

Wide ​​ input ​​ range:4.2V-20.0V, ​​ support ​​ 1 ​​ to ​​ 3 cells battery charge

Full charge voltage: 1.2V-20.0V through external resistor or selectable by BATFB pin

EC3655A(4.2V/cell)/EC3655A1 (4.35V/cell)

High efficiency buck-boost transition

450kHz Switching frequency

Programmable charge current, up to 3A

Quiescent current: <60uA

Integrate battery short protection

Integrate thermal protection

QFN3*4 package

 

Applications

Power bank systems

Battery and super capacitor charging

USB power delivery

​​ Industrial applications

Automotive systems

 

Typical application

 

 

 

 

 

 

 

 

Ordering/Marking Information

EC3655XX ​​ XX ​​ X

 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ R:Tape & Reel

A:4.2V/cell  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ ​​ ​​ Package Type

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​ ​​ ​​​​  ​​​​ A14.35V/cell  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​​​ Q4=QFN3*4-15L

Device

Marking

Package

EC3655AQ4R

JW3655A

XXXXXX

QFN3*4-15L

EC3655A1Q4R

JW3655A-1

XXXXXX

 

 

 

 

 

 

 

Pin Configurations

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Absolute Maximum Ratings

VBUS,BAT, SW1, SW2 Pin ....................................................................................................  -0.3Vto 24V

BST1-SW1, BST2-SW2 .........................................................................................................  -0.3Vto 6.5V

All Other Pins..........................................................................................................................  -0.3Vto 6.5V

JunctionTemperature2)3) .......................................................................................................  150ºC

Lead Temperature ..................................................................................................................  260ºC

Storage Temperature...............................................................................................................  -65ºC to +150ºC

ESD Susceptibility (Human Body Model) ...............................................................................  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 2Kv

 

Recommended Operating Conditions

Input Voltage VIN .................................................................................................................... 4.2Vto 20V

BUS Voltage VBUS..................................................................................................................  3.0Vto 20V

Operation Junction Temp (TJ)..................................................................................................  -40ºCto +125ºC

 

 

 

Thermal Performance

QFN3X4-15.............................................................................................................................  48 ​​  11ºC/W

 

Note

1)  ​​​​ Exceeding these ratings may damage the device.

2)  ​​​​ The EC3655 guarantees robust performance from -40°Cto 150°C junction temperature. ​​ The junction temperature ​​ range ​​ specification ​​ is ​​ assured ​​ by ​​ design, ​​ characterization ​​ and ​​ correlation ​​ with ​​ statistical ​​ process controls.

3)  ​​​​ The EC3655 ​​ includes thermal protection that is intended to protect the device in overload conditions.

Thermal ​​ protection ​​ is ​​ active ​​ when ​​ junction ​​ temperature ​​ exceeds ​​ the ​​ maximum ​​ operating ​​ junction ​​ temperature. Continuous operation over the specified absolute maximum operating junction temperature may damage the device.

4)  ​​​​ Measured on JESD51-7, 4-layer PCB.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Electrical Characteristics

VIN=5V, TA=25unless otherwise stated

Item

Symbol

Condition

Min.

Typ.

Max.

Units

Power supply

VBAT voltage range

VBAT

 

3.0

 

20

V

VCC output voltage

VCC

 

4.7

5.0

5.3

V

VCC output current limit

IVCC

VCC>2.7V

 

50

 

mA

Supply current in shut-down mode

IQ

VBAT=4V, EN=0V

30

 

60

μA

Controller

Switch frequency

Fsw5)

 

350

450

450

kHz

Switch minimum off time

Toff_min5)

 

80

100

120

ns

CE Logic HIGH

VENH

VBAT=8V

 

 

2.5

V

CE Logic LOW

VENL

VBAT=8V

1.6

 

 

V

Buck top switch on-resistance

RdsbkTG5)

 

 

20

28

Buck bottom switch on-resistance

RdsbkBG5)

 

 

20

28

Boost top switch on-resistance

RdsbstTG5)

 

 

20

28

Boost bottom switch on-resistance

RdsbstBG5)

 

 

20

28

Charge

Floating BAT Voltage

VCV

VBATFB =GND,

EC3655A

8.358

8.4

8.442

V

VBATFB =GND,

EC3655A1

8.656

8.7

8.743

Set by divider resistor

3.0

-

20

BAT feedback voltage

VBATFB

External resistor divider

1.191

1.2

1.212

V

BAT Recharge threshold

VREC

VBATFB = GND

8.118

8.2

8.282

V

BAT recharge feedback threshold

VRECFB

EC3655A

1.159

1.171

1.183

V

EC3655A1

1.120

1.131

1.142

V

CC mode charge current

ICC

RCS=10, RISET1=2K

RISET2=1.5K

1.92

2

2.08

A

Charge termination current

ITER

RCS=10, RISET1=2K

RISET2=1.5K

 

10%

 

ICC

Battery full charge deglitch time

T

FULL

ICC< ITER

 

5

 

s

Trickle mode charge current

ITRI

 

13%

25%

37%

ICC

Trickle mode battery threshold

VTRI

VBATFB = GND

5.9

6.0

6.1

V

Trickle mode feedback threshold

VTRIFB

EC3655A

 

0.857

 

V

EC3655A1

 

0.828

 

V

Trickle charge time-out duration

TTRI

 

50

55

60

min

VIN UVP threshold

VIN_UVP

VIN rising

4.0

4.2

4.3

V

 

 

 

 

VIN falling

3.8

4.0

4.1

V

VIN delay to start charging

tchg_delay

 

 

150

 

ms

DRP  reference  voltage  for  adaptive current limit

VDRP

 

0.885

0.9

0.915

V

Battery current sensing ratio

KRATIO

RCS=10, RISET1=2K

RISET2=1.5K

 

3

 

μA/A

Protection

Thermal shutdown threshold5)

TSHUT5)

 

 

150

 

°C

Thermal recovery threshold5)

TREC5)

 

 

130

 

°C

 

Notes:

5)  ​​​​ Guaranteed by design.

 

Pin Description

Pin No.

Name

Description

1

CSP

Positive terminal of battery charge current sense.

2

BAT

Battery positive terminal.

3

PGND

Power Ground.

4

VIN

Main supply pin, connect to adaptor.

5

DRP

VIN droop allowance program pin.

6

CE

Charge enable pin, a logic High on this pin will enable charge.

7

STAT

This  is  a  multi-purpose  Pin. When  charge  enabled, in  the  CC  charge  mode,

the  pin source current is 6μA.In the full charge mode, the pin is pulled to high.

And the pin also as Fault state output pin, asserted during over temperature or 

trickle charge time out conditions.

8

BST1

VIN  side  bootstrap  supply  pin  for  top  switch.  0.1uF  capacitor  is  connected  between BST1 and SW1 pins.

9

SW1

VIN side power switching node. connect to SW2 with inductor

10

SW2

BAT side power switching node.

11

BST2

BAT side  bootstrap  supply pin  for top  switch.  0.1uF capacitor  is  connected  between BST2 and SW2 pins.

12

BATFB

Battery float voltage configuration pin.

  • This pin tied to GND, sets 2 cells float voltage. Pin short to GND: 8.4V/8.7V.

  • And the float voltage could be set to any value (3.0V - 20.0V) 

by the external divider resistor.

13

VCC

5V  LDO  for  power  driver  and  internal  circuit.  Must  be  bypassed  to  GND  with  a minimum of 10uF ceramic capacitor for stable operation.

14

GND

Signal GND.

15

CSN

Negative terminal of battery charge current sense.

 

 

 

 

 

 

Block Diagram

 

 

 

 

 

 

 

 

 

 

 

 

Typical Performance Characteristics

Vin = 5V, L = 3.3µH, CIN = 140µF, CBAT=40uF, 2 Cells, TA = +25°C, unless otherwise noted.

 

 

Typical Performance Characteristics

VIN =5V, L = 3.3μH, CIN= 20μF, COUT = 20μF, TA = +25°C, unless otherwise noted