LTC4100EG Linear Technology, LTC4100EG Datasheet

IC SMART BATTERY CHARGER 24-SSOP

LTC4100EG

Manufacturer Part Number
LTC4100EG
Description
IC SMART BATTERY CHARGER 24-SSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LTC4100EG

Function
Charge Management
Battery Type
Smart Batteries
Voltage - Supply
6 V ~ 28 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-SSOP (0.200", 5.30mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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APPLICATIONS
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L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6650174 and 5723970.
TYPICAL APPLICATION
FEATURES
Single Chip Smart Battery Charger Controller
100% Compliant (Rev. 1.1) SMBus Support Allows
for Operation with or without Host
SMBus Accelerator Improves SMBus Timing
Wide Output Voltage Range: 3.5V to 26V
Hardware Interrupt and SMBAlert Response
Eliminate Interrupt Polling
High Effi ciency Synchronous Buck Charger
0.5V Dropout Voltage; Maximum Duty Cycle > 98%
AC Adapter Current Limit Maximizes Charge Rate
±0.8% Voltage Accuracy; ±4% Current Accuracy
Up to 4A Charging Current Capability
10-Bit DAC for Charge Current Programming
11-Bit DAC for Charger Voltage Programming
User-Selectable Overvoltage and Overcurrent Limits
High Noise Immunity SafetySignal Sensor
Available in a 24-Pin SSOP Package
Portable Instruments and Computers
Data Storage Systems and Battery Backup Servers
SMBALERT#
SMBCLK
SMBDAT
CHGEN
DCIN
ACP
TO 5.5V
3V
1.13k
54.9k
1.21k
10k
17
11
10
15
16
13
14
20
13.7k
6
7
9
8
0.068μF
V
DCDIV
CHGEN
ACP
SMBALERT
SCL
SDA
THB
THA
I
V
I
LIM
DC
DD
LIM
Figure 1. 4A Smart Battery Charger
LTC4100
BGATE
TGATE
INFET
PGND
DCIN
V
GND
CLN
CSP
CLP
BAT
SET
I
0.1μF
TH
5
4
24
23
1
3
2
21
22
18
19
12
SafetySignal
6.04k
0.12μF
DESCRIPTION
The LTC
charging solution that dramatically simplifi es construction
of an SBS compliant system. The LTC4100 implements
a Level 2 charger function whereby the charger can be
programmed by the battery or by the host. A SafetySignal
on the battery being charged is monitored for temperature,
connectivity and battery type information. The SMBus
interface remains alive when the AC power adapter is
removed and responds to all SMBus activity directed to
it, including SafetySignal status (via the ChargerStatus
command). The charger also provides an interrupt to the
host whenever a status change is detected (e.g., battery
removal, AC adapter connection).
Charging current and voltage are restricted to chemistry-
specifi c limits for improved system safety and reliability.
Limits are programmable by two external resistors. Ad-
ditionally, the maximum average current from the AC
adapter is programmable to avoid overloading the adapter
when simultaneously supplying load current and charging
current. When supplying system load current, charg-
ing current is automatically reduced to prevent adapter
overload.
0.0015μF
0.1μF
5k
®
4100 Smart Battery Charger is a single chip
0.033Ω
20μF
0.01μF
0.1μF
10μH
Charger Controller
0.025Ω
100Ω
< 5.5V
> 5.5V
V
BAT
Smart Battery
20μF
LTC4101
LTC4100
PART
SMART BATTERY
SMBCLK
SMBDAT
LTC4100
SYSTEM LOAD
4100 TA01
4100fb
1

Related parts for LTC4100EG

LTC4100EG Summary of contents

Page 1

... Portable Instruments and Computers n Data Storage Systems and Battery Backup Servers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6650174 and 5723970. ...

Page 2

... Power-Fail DD DCIN Current in Shutdown 2 PIN CONFIGURATION BGATE CHGEN SMBALERT PART MARKING PACKAGE DESCRIPTION LTC4100EG 24-Lead Plastic SSOP PART MARKING PACKAGE DESCRIPTION LTC4100EG 24-Lead Plastic SSOP http://www.linear.com/leadfree/ http://www.linear.com/tapeandreel/ l The denotes the specifi cations which apply over the full operating = 25° ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Current Sense Amplifi er, CA1 Input Bias Current into BAT Pin CMSL CA1/I Input Common Mode Low 1 CMSH CA1/I Input Common Mode High 1 Current Comparators I ...

Page 4

LTC4100 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER AC Present Comparator V DCDIV Threshold ACP DCDIV Hysteresis DCDIV Input Bias Current ACP V OH ACP V OL DCDIV to ACP Delay SafetySignal Decoder SafetySignal Trip ...

Page 5

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Logic Levels V SCL/SDA Input Low Voltage IL V SCL/SDA Input High Voltage IH V SDA Output Low Voltage OL I SCL/SDA Input Current IL I SCL/SDA Input ...

Page 6

LTC4100 TYPICAL PERFORMANCE CHARACTERISTICS INFET Response Time to Reverse Current V OF PFET (2V/DIV PFET (5V/DIV (REVERSE PFET (5A/DIV 1.25μs/DIV TEST ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Charging Current Error 0 TEMP = 27°C 0 12V LOAD 0.2 0.1 0 –0.1 –0.2 –0.3 –0 CHARGING CURRENT (A) PIN FUNCTIONS TGATE (Pin 1): Drives the Top ...

Page 8

LTC4100 PIN FUNCTIONS I (Pin 13): An external resistor is connected between this LIM pin and GND. The value of the external resistor programs the range and resolution of the programmed charger cur- rent. This is a digital, not an ...

Page 9

BLOCK DIAGRAM C4 R4 0.01μF 100Ω V SET V BAT 18 C5, 0.1μF GND 12 WATCHDOG SYSTEM LOAD 20μF CLP L1 TGATE 1 CSP Q2 D1 BGATE PGND 2 CLN CLP 24 DCIN ...

Page 10

LTC4100 TEST CIRCUIT 1.19V – CSP BAT V SET LT1055 OPERATION Overview (Refer to Block Diagram) The LTC4100 is composed of a battery charger section, a charger controller, a 10-bit DAC to control charger current, an ...

Page 11

OPERATION While the top MOSFET is off, the bottom MOSFET is turned on until either the inductor current trips the current comparator the beginning of the next cycle. The REV oscillator uses the equation – ...

Page 12

LTC4100 OPERATION Description of Supported Battery Charger Functions The functions are described as follows (see Table 1 also): FunctionName() ‘hnn (command code) Description: A brief description of the function. Purpose: The purpose of the function, and an example where appropriate. ...

Page 13

OPERATION Table 1. Summary of Supported Charger Functions Function Access Address ChargerSpecInfo() 7'b0001_001 Read ChargerMode() 7'b0001_001 Write ChargerStatus() 7'b0001_001 Read ChargingCurrent() 7'b0001_001 Write ChargingVoltage() 7'b0001_001 Write AlarmWarning() 7'b0001_001 Write LTCO() 7'b0001_001 Write Read Alert Response 7'b0001_100 Address Read Byte SMBus ...

Page 14

LTC4100 OPERATION The RES_COLD bit is set only when the SafetySignal re- sistance value is greater than 28.5kΩ. The SafetySignal indicates a cold battery. The RES_COLD bit will be set whenever the RES_OR bit is set. The RES_HOT bit is ...

Page 15

OPERATION Input: The CHARGING_VOLTAGE is an unsigned 16-bit integer specifying the requested charging voltage in mV. The LTC4100 considers any value from 0x0001 through 0x049F the same as writing 0x0000. The following table defi nes the maximum permissible value of ...

Page 16

LTC4100 OPERATION • Change of BATTERY_PRESENT in the ChargerStatus() function. • Setting ALARM_INHIBITED in the ChargerStatus() function. • Internal power-on reset condition. SMBus Accelerator Pull-Ups Both SCL and SDA have SMBus accelerator circuits which reduce the rise time on systems ...

Page 17

OPERATION 9. There is insuffi cient DCIN voltage to charge the battery. The LTC4100 will resume wake-up charging when there is suffi cient DCIN voltage to charge the battery. This condition will not reset the T TIMEOUT Controlled Charging Algorithm ...

Page 18

LTC4100 OPERATION SafetySignal sensing is accomplished by a state machine that reconfi gures the switches of Figure 4 using THA_SELB and THB_SELB, a selectable reference generator, and two comparators. This circuit has two modes of operation based upon whether AC ...

Page 19

OPERATION The I Decoder Block LIM The value of an external resistor connected from this pin to GND determines one of four current limits that are used for maximum charging current value. These limits provide a measure of safety with ...

Page 20

LTC4100 OPERATION The Current DAC Block The current DAC is a delta-sigma modulator which controls the effective value of an external resistor, R set the current limit of the charger. Figure simplifi ed diagram of the DAC ...

Page 21

APPLICATIONS INFORMATION Adapter Limiting An important feature of the LTC4100 is the ability to auto- matically adjust charging current to a level which avoids overloading the wall adapter. This allows the product to operate at the same time that batteries ...

Page 22

LTC4100 APPLICATIONS INFORMATION I is the full-scale charge current. Chose the lowest MAX I value that is still above your expected battery charge MAX current as requested over the SMBus. If you deviate from the resistance values shown in Table ...

Page 23

APPLICATIONS INFORMATION The MOSFET power dissipations at maximum output current are given by δΔT)R 2 PMAIN = OUT IN MAX )(C )(f IN MAX RSS PSYNC = (V – ...

Page 24

LTC4100 APPLICATIONS INFORMATION b) I current is due to SafetySignal (thermistor pin) THRM sampling that will vary with the presence of DC power being on or off. DCDIV is detected every 32ms. RTHX is the value of the safety signal ...

Page 25

APPLICATIONS INFORMATION Soft-Start and Undervoltage Lockout The LTC4100 is soft-started by the 0.12μF capacitor on the I pin. On start-up, I pin voltage will rise quickly 0.5V, then ramp rate set by the internal ...

Page 26

LTC4100 APPLICATIONS INFORMATION Protecting SMBus Inputs The SMBus inputs, SCL and SDA, are exposed to uncon- trolled transient signals whenever a battery is connected to the system. If the battery contains a static charge, the SMBus inputs are subjected to ...

Page 27

APPLICATIONS INFORMATION PCB Layout Considerations For maximum effi ciency, the switch node rise and fall times should be minimized. To prevent magnetic and electrical fi eld radiation and high frequency resonant problems, proper layout of the components connected to the ...

Page 28

LTC4100 PACKAGE DESCRIPTION 7.8 – 8.2 0.42 ±0.03 RECOMMENDED SOLDER PAD LAYOUT 5.00 – 5.60** (.197 – .221) 0.09 – 0.25 0.55 – 0.95 (.0035 – .010) (.022 – .037) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN ...

Page 29

... Added ‘SafetySignal (Thermistor) Value’ Section Changes to Typical Application Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC4100 ...

Page 30

... Charger with Termination LTC4008 High Effi ciency, Programmable Voltage/Current Battery Charger LTC4101 Smart Battery Charger Controller LTC4412 Low Loss PowerPath™ Controller PowerPath is a trademark of Linear Technology Corporation. 30 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● ...

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