Analog Devices ADP3806JRU-12.5, ADP3806JRU, ADP3806JRU-12.6 Datasheet

High-Frequency Switch Mode

a

FEATURES
Li-Ion Battery Charger
Three Battery Voltage Options

Selectable 12.525 V/16.700 V
Selectable 12.600 V/16.800 V
Adjustable

High End-of-Charge Voltage Accuracy

0.4% @ 25C
0.6% @ 5C to 55⬚ C
0.7% @ 0C to 85C

Programmable Charge Current with Rail-to-Rail

Sensing
System Current Sense with Reverse Input Protection
Softstart Charge Current
Undervoltage Lockout
Bootstrapped Synchronous Drive for External NMOS
Programmable Oscillator Frequency
Oscillator SYNC Pin
Low Current Flag
Trickle Charge

Li-Ion Battery Charger

ADP3806

GENERAL DESCRIPTION

The ADP3806 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 ADP3806 is
available in three options. The ADP3806-12.6 guarantees the
final battery voltage be selected to 12.6 V or 16.8 V ± 0.6%, the
ADP3806-12.5 guarantees 12.525 V/16.7 V ± 0.6% and the
ADP3806 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 bootstrapped synchronous driver
allows the use of two NMOS transistors for lower system cost.

APPLICATIONS
Portable Computers
Fast Chargers

BSTREG

SD

LC

VCC BST

VREF + VREG

UVLO

BIAS

LOGIC

CONTROL

ADP3806

FUNCTIONAL BLOCK DIAGRAM

DRVH DRVL

SW

BOOTSTRAPPED

SYNCHRONOUS

DRIVER

SD IN DRVLSD

VREF

PGND

DRVLSD

+

+

–

–

OSCILLATOR

CS+

CS–

+–

AMP1

–

+

+

V

–

TH

–

gm1

+

–

gm2

+

VREF

SYS+ SYS– ISYS

+–

AMP2

2.5V

SELECT

12.6/16.8

–

+

LIMIT

ISET

BAT

AGND

REG

SYNC

CT

REV. 0

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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.

COMPREF

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © Analog Devices, Inc., 2001

BATSEL

ADP3806–SPECIFICATIONS

(@ 0C ≤ TA ≤ 100C, VCC = 16 V, unless otherwise noted.)

Parameter Conditions Symbol Min Typ Max Unit

BATTERY SENSE INPUT

ADP3806-12.6 V and 16.8 V
ADP3806-12.525 V and 16.7 V

= 25°C, 13 V ⱕ VCC ⱕ 20 V V

T

A

5°C ⱕ T
0°C ⱕ T

ⱕ 55°CV

A

ⱕ 85°CV

A

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

BAT

BAT

BAT

BAT

BAT(SD)

–0.4 +0.4 %
–0.6 +0.6 %
–0.7 +0.7 %
250 350 kΩ

0.2 1.0 µA

BATTERY SENSE INPUT

ADP3806

= 2.5 V TA = 25°C, 13 V ⱕ VCC ⱕ 20 V V

V

BAT

0°C ⱕ T

ⱕ 85°CV

A

BAT

BAT

–0.5 +0.5 %
–0.7 +0.7 %

Input Current Operating BATSEL = Open, Part in Operation 0.2 1.0 µA
Input Current Shutdown BATSEL = 100 k to GND, Part in Shutdown 0.2 1.0 µA

OSCILLATOR

Maximum Frequency
Frequency Variation
CT Charge Current I

2

3

CT = 180 pF f

f

CT

CT

CT

1000 kHz
210 250 290 kHz
125 150 175 µA

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

SYNC

2.2 V

H

L

0.8 V

0.2 1.0 µA

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

610 Ω
35 ns
50 ns

DRVH Falling to DRVL Rising
SW Bias Current Part in Shutdown, V
BST Cap Refresh Threshold V

BST

– V

SW

= 12.6 V 0.2 1.0 µA

SW

3.7 V

CURRENT SENSE AMPLIFIER

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

5

Gain

5

Input Bias Current 0 V ⱕ V
Input Offset Current 0 V ⱕ V

and V

CS+

4

CS

0 V ⱕ V

CS–

ⱕ VCC V

CS(CM)

ⱕ VCC, Part in Operation V

CS(CM)

ⱕ 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
DRVL Shutdown Threshold Measured between V

SYSTEM CURRENT SENSE

6

Input Common-Mode Range SYS+ and SYS–, IL = 0 mA, V
Input Differential Range (V

SYS+

) – (V

)V

SYS–

CS+

and V

CS-

= 3 V V

ISYS

V

CS(SD)

SYS(CM)

SYS(DM)

48 mV

4.0 VCC + 0.3 V

0 100 mV
Input Offset Voltage 0.5 mV
Input Bias Current, SYS+ V
Input Bias Current, SYS- V
Voltage Gain 10 V ⱕ V
Output Range I

L

Limit Output Threshold V
Limit Output Voltage V

= 0 V, V

SYS(DM)

= 0 V, V

SYS(DM)

= 1 mA7, V

ⱕ 0.2 V, 50 kΩ Pull-up to 5 V V

LIMIT

> 2.65 V, I

ISYS

ⱕ VCC + 0.3 V, IL = 100 µA 48.5 50 51.5 V/V

SYS(CM)

SYS(CM)

SINK

= 16 V I

SYS(CM)

= 16 V I

SYS(CM)

> 6 V V

= 700 µAV

B(SYS+)

B(SYS–)

ISYS

TH(LIMIT)

O(LIMIT)

200 300 µA
70 125 µA

0 5.0 V

2.3 2.5 2.7 V

0.1 0.2 V

–2–

REV. 0

ADP3806

Parameter Conditions Symbol Min Typ Max Unit

ISET INPUT

Charge Current Programming

Function 0.0 V ⬍ V

Programming Function Accuracy V

= 4.0 V, 1 V ≤ V

ISET

V

= 0.50 V, 1 V ⱕ V

ISET

ISET Bias Current 0.0 V ⱕ V

ⱕ 4.0 V V

ISET

ⱕ 4.0 V I

ISET

ⱕ 16 V–5±1.0 +5 %

CS(CM)

ⱕ 10 V –30 ± 10 +30 %

CS(CM)

ISET/VCS

B

BATSEL INPUT

V

= 12.6 V 2.0 V

BAT

V

= 16.8 V 0.8 V

BAT

BATSEL Input Current 0.2 5.0 µΑ

BOOST REGULATOR

OUTPUT
Output Voltage C
Output Current

10

= 0.1 µFV

L

BSTREG

I

BSTREG

6.8 7.0 7.2 V

3.0 5.0 mA

ANALOG REGULATOR

OUTPUT
Output Voltage C
Output Current

10

= 10 nF V

L

I

REG

REG

5.8 6.0 6.2 V

3.0 5.0 mA

PRECISION REFERENCE

OUTPUT
Output Voltage V
Output Current

10

I

REF

REF

2.47 2.5 2.53 V

0.5 1.1 mA

SHUTDOWN (SD)

ON SD
OFF SD

H

L

2.0 V

SD Input Current 0.2 1.0 µA

POWER SUPPLY

ON Supply Current No External Loads, UVLO ⱕ VCC ⱕ 20 V I
OFF Supply Current No External Loads, VCC ⱕ 20 V I
UVLO

Threshold Voltage Turn On V

SYON

SYOFF

UVLO

5.65 6.0 6.25 V

UVLO Hysteresis Turn Off 0.1 0.3 0.5 V

LC OUTPUT

Output Voltage Low High Current Mode8, I
Output Voltage High Low Current Mode

9

= 100 µA 0.1 0.4 V

SINK

OUTPUT REVERSE

LEAKAGE PROTECTION
Leakage Current VCC = Floating, V

= 12.6 V I

BAT

DISCH

OVERCURRENT

COMPARATOR
Overcurrent Threshold V
Response Time VCS > 180 mV to COMP < 1 V t

CS(OC)

OC

OVERVOLTAGE COMPARATOR

Overvoltage Threshold V
Response Time V

NOTES

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

10

Guaranteed Output Current from 0 to Min specified value to maintain regulation.

Specifications subject to change without notice.

) – (V

CS–

).

CS+

⬍ 93% of final or VCS ⬎ 25 mV.
ⱖ 93% of final and VCS ⱕ 25 mV.

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

SYNC

> 120% to COMP < 1 V t

BAT

BAT(OV)

OV

25 V/V

0.2 1.0 µA

0.8 V

6.0 8.0 mA

1.0 5.0 µA

External V

15 µA

180 mV
2 µs

120 %
2 µs

REV. 0

–3–

ADP3806

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

Input Voltage (VCC) . . . . . . . . . . . . . . . . . . . –0.3 V to +25 V

BAT, CS+, CS– . . . . . . . . . . . . . . . . . .

–0.3 V to VCC +0.3 V

SYS+, SYS– . . . . . . . . . . . . . . . . . . . . . . . . . . . –25 V to +25 V

BST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +30 V

BST to SW . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +8 V

SW to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . –4 V to +25 V

DRVL to PGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +8 V

ISET, BATSEL, SD, SYNC, CT,

LIMIT, ISYS, LC . . . . . . . . . . . . . . . . . . . . –0.3 V to +10 V

COMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +3 V

GND to PGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +0.3 V

Operating Ambient Temperature Range . . . . . . 0°C to 100°C

θJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115°C/W

Operating Junction Temperature Range . . . . . . 0°C to 125°C

Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C

Lead Temperature Range (Soldering 10 sec) . . . . . . . . . 300°C

*This is a stress rating only, operation these limits can cause the device to be

permanently damaged. Unless otherwise specified, all voltages are referenced to
GND. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.

ORDERING GUIDE

Battery Package Package

Model Voltage Description Option

ADP3806JRU Adjustable TSSOP-24 RU-24
ADP3806JRU-12.5 12.525 V/ TSSOP-24 RU-24

16.7 V

ADP3806JRU-12.6 12.600 V/ TSSOP-24 RU-24

16.8 V

PIN CONFIGURATION

24-Lead TSSOP

VCC

SYS–

SYS+

ISYS

LIMIT

SYNC

REG

REF

COMP

CT

SD

LC

1

2

3

4

5

ADP3806

6

TOP VIEW

(Not to Scale)

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

SW

DRVH

BST

BSTREG

DRVL

PGND

CS+

CS–

ISET

BATSEL

BAT

AGND

PIN FUNCTION DESCRIPTIONS

Pin
No. Mnemonic Function

1 VCC Supply Voltage
2 SYS– Negative System Current Sense Input
3 SYS+ Positive System Current Sense Input
4 ISYS System Current Sense Output
5 LIMIT System Current Sense Limit Output
6 CT Oscillator Timing Capacitor
7 SYNC Oscillator Synchronization Pin
8 REG 6.0 V Analog Regulator Output
9 REF 2.5 V Precision Reference Output
10 SD Shutdown Control Input
11 COMP External Compensation Node
12 LC Low Current Output
13 AGND Analog Ground
14 BAT Battery Sense Input.

2.5 V for ADP3806,

12.525 V/16.7 V for ADP3806-12.5,
or 12.6 V/16.8 V for ADP3806-12.6

15 BATSEL Battery Voltage Sense Input

High = 3 Cells, Low = 4 Cells
16 ISET Charge Current Program Input
17 CS– Negative Current Sense Input
18 CS+ Positive Current Sense Input
19 PGND Power Ground
20 DRVL Low Drive Output switches between

REG and PGND
21 BSTREG 7.0 V Regulator Output for Boost
22 BST Floating Bootstrap Supply for DRVH
23 DRVH High Drive Output switches between

SW and BST
24 SW Buck Switching Node Reference

for DRVH

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the ADP3806 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.

–4–

REV. 0