Analog Devices ADP3804 pri Datasheet

High Frequency Switch Mode

=

Li-Ion Battery Charger

Preliminary Technical Data ADP3804

FEATURES

Li-Ion Battery ChargerLi-Ion Battery Charger

Li-Ion Battery Charger

Li-Ion Battery ChargerLi-Ion Battery Charger
Fixed 12,525 V, 12.600 V, or Adjustable BatteryFixed 12,525 V, 12.600 V, or Adjustable Battery

Fixed 12,525 V, 12.600 V, or Adjustable Battery

Fixed 12,525 V, 12.600 V, or Adjustable BatteryFixed 12,525 V, 12.600 V, or Adjustable Battery

VoltageVoltage

Voltage

VoltageVoltage

High End-of-Charge Voltage AccuracyHigh End-of-Charge Voltage Accuracy

High End-of-Charge Voltage Accuracy

High End-of-Charge Voltage AccuracyHigh End-of-Charge Voltage Accuracy

ⴞⴞ

0.4% @ +250.4% @ +25

ⴞ

0.4% @ +25

ⴞⴞ

0.4% @ +250.4% @ +25

ⴞⴞ

0.6% @ 50.6% @ 5

ⴞ

0.6% @ 5

ⴞⴞ

0.6% @ 50.6% @ 5

ⴞⴞ

0.75% @ 00.75% @ 0

ⴞ

0.75% @ 0

ⴞⴞ

0.75% @ 00.75% @ 0

Programmable Charge Current withProgrammable Charge Current with

Programmable Charge Current with

Programmable Charge Current withProgrammable Charge Current with

Rail-to-Rail SensingRail-to-Rail Sensing

Rail-to-Rail Sensing

Rail-to-Rail SensingRail-to-Rail Sensing

System Current Sense with Reverse Input ProtectionSystem Current Sense with Reverse Input Protection

System Current Sense with Reverse Input Protection

System Current Sense with Reverse Input ProtectionSystem Current Sense with Reverse Input Protection
Softstart Charge CurrentSoftstart Charge Current

Softstart Charge Current

Softstart Charge CurrentSoftstart Charge Current
Undervoltage LockoutUndervoltage Lockout

Undervoltage Lockout

Undervoltage LockoutUndervoltage Lockout
Boosted Synchronous Drive For External NMOSBoosted Synchronous Drive For External NMOS

Boosted Synchronous Drive For External NMOS

Boosted Synchronous Drive For External NMOSBoosted Synchronous Drive For External NMOS
Programmable Oscillator FrequencyProgrammable Oscillator Frequency

Programmable Oscillator Frequency

Programmable Oscillator FrequencyProgrammable Oscillator Frequency
Oscillator SYNC PinOscillator SYNC Pin

Oscillator SYNC Pin

Oscillator SYNC PinOscillator SYNC Pin
Constant Current/Constant Voltage FlagConstant Current/Constant Voltage Flag

Constant Current/Constant Voltage Flag

Constant Current/Constant Voltage FlagConstant Current/Constant Voltage Flag
Trickle ChargeTrickle Charge

Trickle Charge

Trickle ChargeTrickle Charge

APPLICATIONS

Portable ComputersPortable Computers

Portable Computers

Portable ComputersPortable Computers
Fast ChargersFast Chargers

Fast Chargers

Fast ChargersFast Chargers

ⴗⴗ

CC

ⴗ

C

ⴗⴗ

CC

ⴗⴗ

C to 55C to 55

ⴗ

C to 55

ⴗⴗ

C to 55C to 55

ⴗⴗ

C to 85C to 85

ⴗ

C to 85

ⴗⴗ

C to 85C to 85

ⴗⴗ

CC

ⴗ

C

ⴗⴗ

CC

ⴗⴗ

CC

ⴗ

C

ⴗⴗ

CC

PRELIMINAR Y

TECHNICAL

FUNCTIONAL BLOCK DIAGRAMFUNCTIONAL BLOCK DIAGRAM

FUNCTIONAL BLOCK DIAGRAM

FUNCTIONAL BLOCK DIAGRAMFUNCTIONAL BLOCK DIAGRAM

GENERAL DESCRIPTION

The ADP3804 is a complete Li-Ion battery charging IC. The
device combines high output voltage accuracy with constant
current control to simplify the implementation of Constant­Current, Constant-Voltage (CCCV) chargers. The ADP3804 is
available in two options. The ADP3804-12.6 guarantees the
final battery voltage to 12.6 V ± 0.6%, the ADP3804-12.5
guarantees 12.525 V ± 0.6% and the ADP3804 is adjustable
using two external resistors to set the battery voltage. The
current sense amplifier has rail-to-rail inputs to accurately
operate under low drop out and short circuit conditions. The
charge current is programmable with a DC voltage on ISET. A
second differential amplifier senses the system current across an
external sense resistor and outputs a linear voltage on the ISYS
pin. The boosted synchronous driver allows the use of two
NMOS transistors for lower system cost.

DA T A

REG

REF

SD

VCC

REGULATOR

REGULATOR

REFERENCE

ADP3804

BSTREG BST DRVH SW DRVL PGND

BOOSTED

SYNCHRONOUS

BOOST

+

SUPPLY

+

BIAS

AGND

UVLO

VREF

DRIVER

OSCILLATOR

SYNC

CT

COMP

CS+ SYSCS SYS+

AMP

1

g

m1

g

m2

CCCV

AMP

2

INPUT

DIVIDER
ADP3804-12.6
ADP3804-12.5

VREF

BATTERY

ADJUST

LIMIT

ISYS

ISET

BAT

ADJ

REV. PrI 12/5/00

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2000

1

ADP3804–SPECIFICATIONS

(@ 0ⴗC £ TA £ 100ⴗC, VCC =16 V, unless otherwise noted)

Parameter Conditions Symbol Min Typ Max Units

BATTERY SENSE INPUT

ADP3804-12.6

V

BAT

V

BAT

V

BAT

V

BAT

Input Resistance Part in Operation R
Input Current Part in Shutdown I

TA = +25°C V
5°C

£ T

£ 55°C

0°C
0°C

A

£ T

£ 85°CV

A

£ T

£ 100°C

A

BAT

V

BAT

BAT

V

BAT
BAT

BAT(SD)

12.550 12.6 12.650 V

12.524 12.676 V

12.505 12.695 V

12.474 12.726 V
400 500 kW

0.2 1.0 mA

BATTERY SENSE INPUT

ADP3804-12.5

V

BAT

V

BAT

V

BAT

V

BAT

Input Resistance Part in Operation R
Input Current Part in Shutdown I

TA = +25°C V
5°C

£ T

£ 55°C

0°C
0°C

A

£ T

£ 85°CV

A

£ T

£ 100°C

A

BAT

V

BAT

BAT

V

BAT
BAT

BAT(SD)

12.475 12.525 12.575 V

12.450 12.600 V

12.430 12.620 V

12.400 12.650 V
400 500 kW

0.2 1.0 mA

BATTERY SENSE INPUT

ADP3804

V

BAT

V

BAT

V

BAT

TA = +25°C V
0°C

£ T

£ 85°CV

£ T

A

£ 100°C

A

0°C

BAT

BAT

V

BAT

2.490 2.500 2.510 V

2.481 2.519 V

2.475 2.525 V

Input Current 0.2 1.0 mA

OSCILLATOR

Maximum Frequency
Frequency Variation
CT Charge Current I

2

3

CT = 150 pF f

PRELIMINAR Y

f

CT
CT
CT

1000 kHz
215 250 285 kHz

130 150 170 mA
0% Duty Cycle Threshold @ COMP Pin 1.0 V
Maximum Duty Cycle Threshold @ COMP Pin 2.5 V
SYNC Input High SYNC
SYNC Input Low SYNC
SYNC Input Current I

TECHNICAL

DA T A

SYNC

2.0 V

H
L

0.2 1.0 mA

0.8 V

GATE DRIVE

On Resistance IL = 10 mA R
Rise, Fall Time C

= 1 nF, DRVL and DRVH tr , t

L

Overlap Protection Delay DRVL Falling to DRVH Rising, t

ON

f

OP

610W
35 ns
50 ns

DRVH Falling to DRVL Rising

SW Bias Current Part in Shutdown, VSW = 12.6 V 0.2 1.0 µA

CURRENT SENSE AMPLIFIER

Input Common-mode Range V
Input Differential Mode Range V
Input Offset Voltage

5

Gain

5

and V

CS+

4

CS

0 V £ V

Input Bias Current 0 V £ V
Input Offset Current 0 V £ V

CS–

£ VCC V

CS(CM)

£ VCC, Part in Operation V

CS(CM)

£ VCC V

CS(CM)

V

CS(CM)

V

CS(DM)
CS(VOS)

CS(IB)
CS(IOS)

0.0

VCC+0.3

V

0.0 160 mV

1.0 mV
25 V/V
50 100 µA

1.0 2.0 µA

Input Bias Current Part in Shutdown 0.2 1.0 µA

SYSTEM CURRENT SENSE

Input Common Mode Range
Input Differential Range (V

6

SYS+ and SYS- V

SYS+

) - (V

)V

SYS-

SYS(CM)

SYS(DM)

4.0 VCC+0.3 V

0 100 mV
Input Offset Voltage 1.0 2.0 mV
Input Bias Current, SYS+ V
Input Bias Current, SYS- V
Voltage Gain 10 V £ V
Output Range

IL = 1 mA7,

SYS(DM)
SYS(DM)

= 0 V, V
= 0 V, V

£ VCC + 0.3V 48 50 52 V/V

SYS(CM)

V

SYS(CM)

Limit Output Threshold V
Limit Output Voltage V

ISYS

> V

TH(LIMIT)

= 16 V I

SYS(CM)

= 16 V I

SYS(CM)

> 6 V V

, I

= 1 mA V

SINK

B(SYS+)
B(SYS–)

ISYS
TH(LIMIT)
O(LIMIT)

50 100 mA
25 50 mA

0 5.0 V

2.4 2.5 2.6 V

0.1 0.2 V

–2–

REV. PrI

ADP3804

Parameter Conditions Symbol Min Typ Max Units

ISET INPUT

Charge Current Programming

<

V

Function 0.0 V

Programming Function Accuracy V

V

ISET
ISET

= 4.0 V
= 0.50 V,

ISET Bias Current 0.0 V £ V

ISET

ISET

£ 4.0 V

£ 4.0 V

ADJ INPUT

V

Adjustment V

BAT

Adjustment V

V

BAT

Disable Threshold 4.4 4.6 V

V

BAT

ADJ Bias Current 1.0 V £ V

= 1 V –4.8 –5.0 –5.2 %

ADJ

= 4 V +4.8 +5.0 +5.2 %

ADJ

£ 4.0 V 0.2 1.0

ADJ

BOOST REGULATOR

OUTPUT
Output Voltage C

= 0.1 mFV

L

Output Current I

ANALOG REGULATOR

OUTPUT

Output Voltage CL = 10 nF V
Output Current

PRECISION REFERENCE

OUTPUT
Output Voltage V
Output Current I

SHUTDOWN (SD)

ON SD
OFF SD
SD Input Current 0.2 1.0

PRELIMINAR Y

POWER SUPPLY

ON Supply Current No External Loads I
OFF Supply Current No External Loads I

Threshold Voltage Turn On V

UVLO

TECHNICAL

DA T A

UVLO Hysteresis Turn Off 0.1 0.3 0.5 V

CCCV OUTPUT

Output Voltage Low Constant Current Mode8, V

= 100 µA 0.1 0.4 V

I

SINK

Output Voltage High Constant Voltage Mode9, V

= 2.5 V,

ISET

= 2.5 V external V

ISET

OUTPUT REVERSE

LEAKAGE PROTECTION
Leakage Current VCC = Floating, V

1

All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.

2

Guaranteed by design, not tested in production.

3

If SYNC function is used, then f

4

VCS = (V

5

Accuracy guaranteed by ISET INPUT, Programming Function Accuracy specification.

6

System current sense is active during shutdown.

7

Load current is supplied through SYS+ pin.

8

V

BAT

9

V

BAT

Specifications subject to change without notice.

) – (V

CS–

).

CS+

< 95% of final or VCS > 80% of ISET programmed value.

³³

³ 95% of final and VCS

³³

must be greater than fCT, but less than 120% of fCT.

SYNC

££

£ 80% of ISET programmed value.

££

= 12.6 V I

BAT

V

ISET/VCS

I

B

BSTREG

BSTREG

REG

I

REG

REF

REF

H
L

SYON
SYOFF

UVLO

DISCH

25
–5 ±1.0 +5
–20 ±10 +20

0.2 1.0

V/V
%
%

mA

mA

6.8 7.0 7.2 V
35 mA

5..8 6.0 6.2 V

3.0 5.0 mA

2.475 2.5 2.525 V

0.5 1.1 mA

2.0 V

0.8 V

m

A

8.0 10 mA

2.0 10

m

A

5.75 6.0 6.25 V

3.0 10 µA

REV. PrI

–3–