ADP2291ACPZ-R7 Analog Devices Inc, ADP2291ACPZ-R7 Datasheet

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ADP2291ACPZ-R7

Manufacturer Part Number
ADP2291ACPZ-R7
Description
IC CHARGER LI-ION 4.2V 8LFCSP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of ADP2291ACPZ-R7

Function
Charge Management
Battery Type
Lithium-Ion (Li-Ion)
Voltage - Supply
4.5 V ~ 12 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-VFDFN, CSP Exposed Pad
For Use With
ADP2291-EVAL - BOARD EVAL FOR ADP2291LI
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
ADP2291ACPZ-R7
ADP2291ACPZ-R7TR
FEATURES
Simple, safe linear charger for single-cell lithium battery
4.5 V to 12 V input voltage range
Adjustable charging current up to 1.5 A
Low cost PNP external pass element
Automatic reverse isolation with no external blocking diode
Output overshoot protection
Deep discharge precharge mode
Thermal shutdown
Automatic recharge
Programmable termination timer
LED charging status indicator
4.2 V output voltage with ±1% accuracy over line and
1 µA shutdown supply current
Small, 8-lead MSOP and 3 × 3 mm LFCSP packages
APPLICATIONS
Wireless handsets
Smart handhelds and PDAs
Digital cameras
Single-cell, lithium ion-powered systems
Cradle chargers
Rev. A
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. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
temperature
4.6V–12V
INPUT
CIN
TYPICAL OPERATING CIRCUIT
CTIMER
IN
CHG
RS
Figure 1.
TIMER
CS
ADP2291
Compact, 1.5 A Linear Charger
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The ADP2291 is a constant-current/constant-voltage linear
charger for a single-cell, lithium ion battery, requiring just a few
components to provide a simple and safe charging system that
operates from a wide 4.5 V to 12 V input voltage range. It
features an internally controlled, multistep charging cycle that
improves battery life.
An external, low cost PNP provides the charging current to the
battery, and an external resistor sets the maximum charge
current. A small, external capacitor programs the maximum
charge time. The controller includes an LED driver to indicate
the battery charging status.
Safety features include charging stop mode for battery faults,
output overshoot protection, and thermal shutdown. The
ADP2291 also features automatic reverse isolation, which does
not require an additional blocking diode.
The multistep charge cycle optimizes the battery charging time
in a safe manner. It features a trickle charge mode for a deeply
discharged cell and a fast charging mode with a maximum
current of 1.5 A. The ADP2291 controls the end of charge with
a 4.2 V output voltage that is 1% accurate over line and tem-
perature. It automatically recharges the battery if the cell voltage
drops. When the input supply is removed, the part enters a low
current state and reduces the current drawn from the battery to
below 1 µA.
The ADP2291 is available in both a small, 8-lead MSOP
package and a 3 × 3 mm LFCSP package that is ideally suited
for small, portable applications.
DRV
ADJ
Q1
for Single-Cell Li+ Battery
GND
BAT
SHUTDOWN
COUT
© 2005 Analog Devices, Inc. All rights reserved.
+
ADP2291
www.analog.com

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ADP2291ACPZ-R7 Summary of contents

Page 1

FEATURES Simple, safe linear charger for single-cell lithium battery 4 input voltage range Adjustable charging current up to 1.5 A Low cost PNP external pass element Automatic reverse isolation with no external blocking diode Output overshoot ...

Page 2

ADP2291 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Typical Operating Circuit................................................................ 1 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 Typical Performance Characteristics ............................................. 7 Theory of ...

Page 3

SPECIFICATIONS open –40°C to +85°C, typical values are at 25°C, unless otherwise noted. IN BAT ADJ A Table 1. Parameter POWER SUPPLY, IN Input Voltage Current Draw BATTERY VOLTAGE, ...

Page 4

ADP2291 Parameter BATTERY CHARGE TIMER Charge/Discharge TIMER Current Low Threshold High Threshold High-Low Threshold Delta 2 OVERSHOOT PROTECTION BAT Threshold Current Sink CHG OUTPUT Output Voltage Low Output Leakage Current BASE DRIVE CAPABILITY Maximum Base Drive Current THERMAL SHUTDOWN Shutdown ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter 1 IN, DRV, CS, CHG to GND BAT, ADJ, TIMER to GND Operating Ambient Temperature Operating Junction Temperature θ , 2-layer MSOP-8 JA θ , 4-layer MSOP-8 JA θ , 2-layer LFCSP-8 JA θ ...

Page 6

ADP2291 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS DRV CHG 1 8 ADP2291 GND TIMER 2 7 TOP VIEW BAT (Not to Scale) CS ADJ 4 5 Figure 2. 8-Lead MSOP Pin Configuration Table 3. Pin Function Descriptions Pin ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS 4.21 4.205 4.20 4.195 4. (V) IN Figure 4. Battery Voltage vs. Input Voltage 4.21 4.205 4.20 4.195 4.19 –50 – TEMPERATURE (°C) Figure 5. Battery Voltage vs. Temperature 4.22 ...

Page 8

ADP2291 16.0 15.8 15.6 15.4 15.2 15 (V) IN Figure 10. Precharge V vs. Input Voltage RS 15.5 15.4 15.3 15.2 15.1 –50 – TEMPERATURE (°C) Figure 11. Precharge V vs. Temperature RS ...

Page 9

V (V) IN Figure 16. Base Drive vs. Input Voltage 122 120 118 116 114 112 110 108 106 104 –40 – TEMPERATURE (°C) Figure 17. Base ...

Page 10

ADP2291 THEORY OF OPERATION The ADP2291 is intended to charge a single-cell, lithium battery from a supply voltage or wall adapter providing 4 The charge controller adjusts the base current of an external PNP transistor to ...

Page 11

THERMAL SHUTDOWN If the ADP2291 junction temperature rises above 135°C, thermal shutdown occurs. Extreme junction temperatures can be the result of excessive current operation and/or high ambient temperatures. 3V ADJ 0.4V IN BAT IN 3.8V IPNP C/10 A 35°C temperature ...

Page 12

ADP2291 APPLICATION INFORMATION SETTING THE MAXIMUM CHARGE CURRENT The maximum charge current is set by choosing the proper current sense resistor and the voltage on the ADJ input. S The charger nominally regulates its output current at the ...

Page 13

In cases where the voltage drop across the protection device must be kept low MOSFET is recommended. Connect the MOSFET as shown in Figure 21. RS INPUT 4.6V–12V CIN CS IN CHG Figure 21. Reverse Input Protection EXTERNAL ...

Page 14

ADP2291 TYPICAL APPLICATION CIRCUIT A typical application circuit is shown in Figure 22. The circuit is capable of a 750 mA charge current for an input voltage of 4 Higher input voltages can be used, but ...

Page 15

VIN < 3.8V POWER-DOWN FROM ANYWHERE VRS = 0mV ASYNCHRONOUSLY CHG = OPEN VIN > 3.8V START VRS = 0mV CHG = OPEN START SEQUENCE ENDS PRECHARGE VRS = 15mV CHG = LOW MIN BATTERY FAULT VRS ...

Page 16

ADP2291 PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS Use the following general guidelines when designing printed circuit boards: • Keep the output capacitor as close to the BAT and GND pins as possible. • Keep the input capacitor as close to the ...

Page 17

... OUTLINE DIMENSIONS PIN 1 INDICATOR 0.90 MAX 0.85 NOM SEATING PLANE ORDERING GUIDE Model Temperature Range 1 ADP2291ARMZ-R7 −40°C to +85°C ADP2291ACPZ-R7 1 −40°C to +85°C ADP2291-EVAL Pb-free part. 3.00 0.60 MAX BSC SQ 8 2.75 TOP BSC SQ VIEW 0.50 BSC 5 0.70 MAX 12° ...

Page 18

ADP2291 NOTES Rev Page ...

Page 19

NOTES Rev Page ADP2291 ...

Page 20

ADP2291 NOTES © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04873-0-11/05(A) Rev Page ...

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