Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - battery management Charge management Li-Ion, Li-Po WFBGA 30 Surface-mount

1.2A Switch-Mode Li+ Chargers with ±22V Input

Rating and JEITA Battery Temperature Monitoring

MAX8900A/MAX8900B/MAX8900C

EVALUATION KIT AVAILABLE

19-5063; Rev 4; 11/14

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

General Description

The MAX8900_ is a high-frequency, switch-mode char-

ger for a 1-cell lithium ion (Li+) or lithium polymer

(Li-Poly) battery. It delivers up to 1.2A of current to the

battery from 3.4V to 6.3V (MAX8900A/MAX8900C) or

3.4V to 8.7V (MAX8900B). The 3.25MHz switch-mode

charger is ideally suited to small portable devices such

as headsets and ultra-portable media players because it

minimizes component size and heat.

Several features make the MAX8900_ perfect for high-

reliability systems. The MAX8900_ is protected against

input voltages as high as +22V and as low as -22V.

Battery protection features include low voltage prequali-

fication, charge fault timer, die temperature monitoring,

and battery temperature monitoring. The battery temper-

ature monitoring adjusts the charge current and termina-

tion voltage as described in the JEITA* specification for

safe use of secondary lithium-ion batteries.

Charge parameters are easily adjustable with external

components. An external resistance adjusts the charge

current from 50mA to 1200mA. Another external resis-

tance adjusts the prequalification and done current

thresholds from 10mA to 200mA. The done current thresh-

old is very accurate achieving Q1mA at the 10mA level.

The charge timer is adjustable with an external capacitor.

The MAX8900_ is available in a 0.4mm pitch, 2.44mm x

2.67mm x 0.64mm WLP package.

Applications

Features

S 3.25MHz Switching Li+/Li-Poly Battery Charger

S JEITA Battery Temperature Monitor Adjusts

Charge Current and Termination Voltage

S 4.2V ±0.5% Battery Regulation Voltage (Alternate

4.1V Target Available on Request)

S Adjustable Done Current Threshold

Adjustable from 10mA to 200mA

±1mA Accuracy at 10mA

S High-Efficiency and Low Heat

S Uses a 2.0mm x 1.6mm Inductor

S Positive and Negative Input Voltage Protection

(±22V)

S Up to +20V Operating Range (Alternate OVLO

Ranges Available on Request)

S Supports No-Battery Operation

S Fault Timer

S Charge Status Outputs

S 2.44mm x 2.67mm x 0.64mm Package

Simplified Applications Circuit

Ordering Information (continued)

USB Charging

Headsets and Media

Players

Smartphones

Digital Cameras

GPS, PND

eBook

Ordering Information continued at end of data sheet.

PART

TEMP

RANGE

PIN-

PACKAGE

OPTIONS

MAX8900AEWV+T

-40NC to

+85NC

30 WLP

OVLO

= 6.5V

T1 = 0NC

2-pin status indicators

PQUTH

= 2.8V

MAX8900BEWV+T

-40NC to

+85NC

30 WLP

OVLO

= 9.0V

T1 = -15NC

3-pin status indicators

PQUTH

= 2.8V

MAX8900_

1FH

Li+/

Li-POLY

SYSTEM

LOAD

BST

2.2FF

6.3V

0603

0.47FF

25V

0603

0.47FF

25V

0603

(-22V TO +22V)

1.0FF

6.3V

0402

OFF

STAT1

STAT2

STAT3

CEN

PVL

INBP

CT SETI DNI

THM

GND

AVL

BAT

PGND

*JEITA (Japan Electronics and Information Technology

Industries Association) standard, “A Guide to the Safe Use

of Secondary Lithium Ion Batteries in Notebook-type Personal

Computers” April 20, 2007.

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

Summary of content (35 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring General Description The MAX8900_ is a high-frequency, switch-mode charger for a 1-cell lithium ion (Li+) or lithium polymer (Li-Poly) battery. It delivers up to 1.2A of current to the battery from 3.4V to 6.3V (MAX8900A/MAX8900C) or 3.4V to 8.7V (MAX8900B). The 3.
PAGE 2
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring TABLE OF CONTENTS Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 3
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring TABLE OF CONTENTS (continued) Charge-Source Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Charge-Source Impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Inductive Kick . . . . . . . . . . .
PAGE 4
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring ABSOLUTE MAXIMUM RATINGS IN to PGND..............................................................-22V to +22V INBP to PGND........................................... (VBAT - 0.3V) to +22V IN to INBP...............................................................-30V to +1.2V STAT1, STAT2 to GND...........................................-0.3V to +30V BST to PGND.............................
PAGE 5
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring ELECTRICAL CHARACTERISTICS (continued) (VIN = 6V, VBAT = 4V, RSETI = 2.87kI, RDNI = 3.57kI, VTHM = VAVL/2, circuit of Figure 1, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 6
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring ELECTRICAL CHARACTERISTICS (continued) (VIN = 6V, VBAT = 4V, RSETI = 2.87kI, RDNI = 3.57kI, VTHM = VAVL/2, circuit of Figure 1, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.
PAGE 7
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring ELECTRICAL CHARACTERISTICS (continued) (VIN = 6V, VBAT = 4V, RSETI = 2.87kI, RDNI = 3.57kI, VTHM = VAVL/2, circuit of Figure 1, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX ISINK = 1mA 0.025 0.05 ISINK = 15mA 0.
PAGE 8
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Typical Operating Characteristics (Circuit of Figure 1, VIN = 6V, VBAT = 3.6V, TA = +25NC, unless otherwise noted.) 20 80 40 VIN RISING 20 0 -20 -20 -20 -10 0 10 20 30 -10 VIN (V) 0 30 RL = 90mI 1.0 1.2 1.0 0.6 VCEN = 0V VBAT = 4.0V RSETI = 3.01kI 0.6 0.4 0.4 VIN RISING 0.2 VIN FALLING 0.2 RSETI = 2.87kI VCEN = 0V VIN = 6.0V RSETI = 3.
PAGE 9
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Typical Operating Characteristics (continued) (Circuit of Figure 1, VIN = 6V, VBAT = 3.6V, TA = +25NC, unless otherwise noted.) SWITCHING FREQUENCY vs. INPUT VOLTAGE SWITCHING FREQUENCY vs. CHARGE CURRENT 3.5 VBAT = 4V 3.0 2.5 2.0 MAX8900x VIN RISING VOVLO = 28V VCEN = 0V RISET = 2.87kI 1.5 1.0 0.5 MAX8900A toc11 VBAT = 3V SWITCHING FREQUENCY (MHz) SWITCHING FREQUENCY (MHz) 4.
PAGE 10
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Typical Operating Characteristics (continued) (Circuit of Figure 1, VIN = 6V, VBAT = 3.6V, TA = +25NC, unless otherwise noted.) THM NORMAL TO COLD CURRENT FOLDBACK (T2) TO COLD SHUTOFF (T1) THM NORMAL TO HOT VOLTAGE FOLDBACK (T3) TO HOT SHUTOFF (T4) THRESHOLD MAX8900A toc16 MAX8900A toc17 60% OF AVL (T2) VTHM VTHM 1V/div 74.5% OF AVL (T1) 34.7% OF AVL (T3) VBAT 2V/div 22.
PAGE 11
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Typical Operating Characteristics (continued) (Circuit of Figure 1, VIN = 6V, VBAT = 3.6V, TA = +25NC, unless otherwise noted.) EFFICIENCY vs. CHARGE CURRENT (CONSTANT-VOLTAGE MODE) 90 VBAT = 3.6V 80 85 80 78 76 75 VBAT = 3.0V 70 74 5 6 7 8 9 10 BATTERY + LX LEAKAGE CURRENT vs. BATTERY VOLTAGE BATTERY + LX LEAKAGE CURRENT vs.
PAGE 12
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Typical Operating Characteristics (continued) (Circuit of Figure 1, VIN = 6V, VBAT = 3.6V, TA = +25NC, unless otherwise noted.) 5V IN CONNECT BATTERY CONNECT MAX8900A toc31 MAX8900A toc32 6V VIN VIN 2V/div 5V/div 4.2V 3.6V VBAT VLX 2V/div 5V/div IBAT RSETI = 6.81kI 1.2A IBAT 500mA/div 0A 500mA/div RSETI = 2.
PAGE 13
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Pin Configuration TOP VIEW (BUMPS DOWN) + BAT CS LX PGND BST PVL A1 A2 A3 A4 A5 A6 BAT CS LX PGND PGND PGND B1 B2 B3 B4 B5 B6 STAT2 CEN INBP INBP INBP INBP C1 C2 C3 C4 C5 C6 STAT1 STAT3 IN IN IN IN D1 D2 D3 D4 D5 D6 DNI SETI CT THM AVL GND E1 E2 E3 E4 E5 E6 30 WLP (0.
PAGE 14
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Pin Description (continued) PIN C3–C6 NAME INBP FUNCTION Power Input Bypass. Connect all INBP pins together externally. Bypass INBP to PGND with a 0.47FF ceramic capacitor. STAT1 Status Output 1. STAT1 is an open-drain output that has a 30V absolute maximum rating and a typical internal pulldown resistance of 25I.
PAGE 15
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring 1FH 1.5A 0.1FF 10V 0402 VIN RANGE: -22V TO +22V BST IN 0.47FF 25V 0603 BAT 422I * 422I BAT PGND BAT 2.2FF 6.3V 0603 PGND 422I * STAT1 STAT2 STAT3 OFF ON 0.47FF 25V 0603 CEN PVL INBP CT 0.47FF 6.3V 0402 GND SYSTEM LOAD Li+/ Li-POLY MAX8900_ AVL * 1.0FF 6.3V 0402 CS LX IN 0.1FF 6.3V 0201 GND 10kI 0201 THM SETI 2.87kI 0201 10kI 3380k 0402 T DNI 3.
PAGE 16
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring STAT1: D1 BV = 30V STAT2: C1 BV = 30V BAT_T STAT3: D1 BV = 6V INPUT OVERVOLTAGE OVLO LOGIC VOVLO GND: E6 CT: E3 CHARGER TIMER INPUT UNDERVOLTAGE UVLO CTS VUVLO IN: D3 IN: D4 IN: D5 CEN: C2 RCEN IN RAVL 12.
PAGE 17
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Detailed Description The MAX8900_ is a full-featured, high-frequency switchmode charger for a 1-cell Li+ or Li-Poly battery. It delivers up to 1.2A to the battery from 3.4V to 6.3V (MAX8900A/MAX8900C) or 3.4V to 8.7V (MAX8900B). Contact the factory for input operating voltage ranges up to +20V. The 3.
PAGE 18
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Setting the Prequalification Current and Done Threshold (DNI) As shown in Figure 5, a resistor from DNI to ground (RDNI) sets the prequalification current (IPQ) and done current (IDN). The MAX8900_ supports values of RDNI from 1.19kI to 38.2kI.
PAGE 19
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring to enable the MAX8900_. CEN has an internal 200kI pulldown resistor. When disabled, the MAX8900_ supply current is reduced, the step-down converter high-side and low-side switches are off, and the AVL is disabled. VIN must be greater than VUVLO-RISING for the MAX8900_ to operate when CEN is pulled low.
PAGE 20
MAX8900A/MAX8900B/MAX8900C 1.
PAGE 21
MAX8900A/MAX8900B/MAX8900C 1.
PAGE 22
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Charger Disabled State When CEN is high or the input voltage is out of range, the MAX8900_ disables the charger. To exit this state, CEN must be low and the input voltage must be within its valid range. Dead-Battery State When a deeply discharged battery is inserted with a voltage of less than VPQLTH, the MAX8900_ disables the switching charger and linearly charges with IDBAT.
PAGE 23
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Done State The MAX8900_ enters its done state after the charger has been in the top-off state for tTO. In this state, the switching charger is off and no current is delivered to the battery. Although the charger is off, the SETI and DNI pins are biased in the done state and the MAX8900_ consumes the associated current from the battery (IBAT = 1.5V/RSETI + 1.5V/RDNI + 3FA).
PAGE 24
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Table 1. 2.44mm x 2.67mm x 0.64mm, 0.4mm Pitch WLP Thermal Characteristics FOUR-LAYER PCB (JESD51-9:2s2p) Continuous Power Dissipation BJA BJC Board Parameters 1619mW Derate 20.2mW/NC above +70NC/W 49.4NC/W 9NC/W • • • • • • • • Still air 4-layer board 1.5oz copper on outer layers 1oz copper on inner layers 1.
PAGE 25
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Table 2.
PAGE 26
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring A. BASIC THERMISTOR CONFIGURATION AVL: E5 RTB AVL B.
PAGE 27
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring PVL and AVL Regulator When the status outputs are used to drive LED indicators, a series resistor should limit the LED current to be less than 30mA (Figure 1). The STAT1 and STAT2 typical pulldown resistance is 25I and the absolute maximum rating is +30V. This +30V rating allows IN to be used to bias STAT1 and STAT2.
PAGE 28
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Inductor Selection Consider inductance, current rating, series resistance, physical size, and cost when selecting an inductor. These factors affect the converter’s efficiency, maximum output current, transient response time, and output voltage ripple. Tables 5 and 6 show suggested inductor values based upon input voltage and laboratory tests.
PAGE 29
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring If the input voltage approaches the BAT voltage during fast-charge constant current state, the maximum current is no longer limited by the current loop, but by the dropout resistance. The total dropout resistance is: RDROPOUT = RIN2INBP + RHS + RL + RSNS = 0.120I + 0.100I + RL + 0.040I RDROPOUT heavily depends upon the inductor ESR (RL). A low RL is required to maximize performance.
PAGE 30
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring capacitor (CBST) is a 0.1FF with a voltage rating of 10V or greater. If CBST is increased then maintain a ratio of less than 1:10 between CBST and CPVL. CBST stores charge to drive the high-side n-channel gate. The minimum AVL capacitor is 0.1FF with a voltage rating of 6.3V. The minimum PVL capacitor is 1.0FF with a voltage rating of 6.3V.
PAGE 31
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring impedance), the voltage spike could be twice that of the nominal source voltage. In other words, a 6V source with a high-Q LC tank circuit in the cabling can result in a voltage spike as high as 12V. The MAX8900_’s high input absolute maximum voltage rating of +22V to -22V eliminates any concerns about the voltage spikes due to inductive kicking for many applications.
PAGE 32
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring The guidelines at the top are the most critical: 1) When the step-down converter’s high-side MOSFET turns on, CINBP delivers a high di/dt current pulse to INBP. Because of this high di/dt current pulse, place CINBP close to INBP to minimize the parasitic impedance in the PCB trace.
PAGE 33
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring EPOXY TOP VIEW SCALE DRAWING 5x6 BUMP ARRAY (30 BUMPS) 1 2 3 4 5 WAFER 6 A: FINISHED PAD DIAMETER: 180µm (min) 210µm (max) A B C A D B C E B: PAD PITCH: 400µm C: HEIGHT: 1.6mm EPOXY COPPER PILLAR (UBM) EPOXY D: WIDTH: 2.0mm EPOXY G F A COPPER PILLAR (UBM) B E D 1oz COPPPER PAD 1oz COPPPER PAD PCB Figure 15.
PAGE 34
MAX8900A/MAX8900B/MAX8900C 1.2A Switch-Mode Li+ Chargers with ±22V Input Rating and JEITA Battery Temperature Monitoring Package Information For the latest package outline information and land patterns, go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 35
MAX8900A/MAX8900B/MAX8900C 1.