ADP2291ACPZ-R7 Analog Devices Inc, ADP2291ACPZ-R7 Datasheet
ADP2291ACPZ-R7
Specifications of ADP2291ACPZ-R7
ADP2291ACPZ-R7TR
Related parts for ADP2291ACPZ-R7
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 ...