SMB1360 SMPS Battery Charger and Fuel Gauge [80-NH006-21 Rev. A ed.]

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SMB1360 SMPS Battery Charger and Fuel Gauge

80-NH006-21 Rev. A Confidential and Proprietary - Qualcomm Technologies, Inc. Restricted Distribution: Not to be distributed to anyone who is not an employee of either Qualcomm or its subsidiaries without the express approval of Qualcomm's Configuration Management.

Confidential and Proprietary - Qualcomm Technologies, Inc.

NO PUBLIC DISCLOSURE PERMITTED: Please report postings of this document on public servers or websites to: [email protected]. Restricted Distribution: Not to be distributed to anyone who is not an employee of either Qualcomm or its subsidiaries without the express approval of Qualcomm's Configuration Management. Not to be used, copied, reproduced, or modified in whole or in part, nor its contents revealed in any manner to others without the express written permission of Qualcomm Technologies, Inc. Qualcomm is a trademark of QUALCOMM Incorporated, registered in the United States and other countries. All QUALCOMM Incorporated trademarks are used with permission. Other product and brand names may be trademarks or registered trademarks of their respective owners. This technical data may be subject to U.S. and international export, re-export, or transfer (“export”) laws. Diversion contrary to U.S. and international law is strictly prohibited. Qualcomm Technologies, Inc. 5775 Morehouse Drive San Diego, CA 92121 U.S.A. © 2014 Qualcomm Technologies, Inc.

Confidential and Proprietary - Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NH006-21 Rev. A

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Revision History Revision

Date

Description

A

February 2014

Initial Release.

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Agenda SMB1360 •

Introduction

•

Package

•

Reference Schematic

•

GUI and Programmability

•

Layout Guidelines

•

Charger Operation

•

Fuel Gauge

•

Test Results

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SMB1360: Introduction The SMB1360 integrates a fully programmable single cell Li-ion and Li-polymer SMPS charger together with HW-based Fuel Gauge. •

SMPS charger allows for charging operation at higher current and lower thermal conditions, in smaller package.

•

Extended programmability, thanks to QCOM-Summit GUI, enhances flexibility of operations with different battery packs.

•

HW-based Fuel Gauge efficiently allocates hardware resources to reduce power consumption and provide high accuracy State of Charge (SoC) estimates.

•

Customer-programmability extends to Fuel Gauge portion, thus increasing end-user experience and flexibility of operations. 5.00mm

System

VCHG I2C

ADC USB

0402

R_SENSE 0603

CMID 0603

GND

USB AC/DC 100-1500mA 4.0V-6.2V

Li-Ion

CIN 0603

D+ NC

D-

Switching Charger + Fuel Gauge

To System

LOUT 2016

SMB1360

0402

VB US

SMB1360

Total Output T1). The OCV is a function of temperature, battery SoC, and state of the battery (charging/discharging).

•

ESR: Equivalent Series Resistance affects the instantaneous power the battery can deliver. It varies largely with temperature and is also a function of the state of the battery (charging/discharging).

•

T1 Time Constant: It accounts for variation of battery SoC upon previous battery utilization. It is usually in the range of minutes. The T1 resistive component R1 varies with temperature, battery temperature and battery SoC levels. Time Constant T1

+ ESR

Battery Voltage

OCV

R1

C1

-

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HW Fuel Gauge: Sensing Circuitry The HW FG algorithm operates on synchronous readings of: •

IBATT battery current: It is sensed through a current sense resistor, placed in series of the positive node of the battery. A specific high performance ADC is used to digitize the current information.

•

VBATT battery voltage: It is sensed differentially at the battery contacts. A specific high performances ADC is integrated to convert battery voltage information.

•

Battery temperature: specific circuitry is implemented to sense battery information. Two dedicated pins are provided. A NTC thermistor is to be used, placed onto the PCB, if the battery is not provided with an integrated thermistor. DC Input 4.0V-6.2V (28V MAXABS) 100mA-1500mA prog.

MID(2) 2.2F

Aux LDO

LDO

4.85V @ 50mA

DCIN(2)

0.47uF

1F VDD_LDO

SW(2)

1uH ( T2

BMD

T > T3

THERM RT

-

+

VF

Battery Pack

RID

BATTERY PACK Confidential and Proprietary - Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NH006-21 Rev. A

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HW Fuel Gauge: Advanced Features AUTOMATIC RECHARGE MASKING This feature can help improving the user experience. Specifically: It masks the SoC change due to the recharge action (if the recharge option is enabled, the charger module is configured to restart charging after the battery voltage has fallen below a certain threshold).

C ha rg er D isc o n n e c te d 100 %

SoC

•

M o n o to n ic S o c B a tte r y S o C

B a tte r y C u r r e n t C h a r g in g T e r m in a t io n cu r r e n t r e a ch e d

T im e

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HW Fuel Gauge: Advanced Features BATTERY SoC MATCH

Connection Sequence

This feature helps improving the user experience by First SoC Estimate

allowing the system to recognize the same battery has been disconnected and then reconnected right away. Specifically: •

First connection ?

At the moment the battery gets disconnected, the

following data are stored into the memory:

•

–

Battery state of charge

–

Battery current

Recover data from the system

Recover data from the internal memory

At the battery reinsertion, the following data are used to detect whether the same battery has been

Evaluate battery model

reinserted.

–

Battery voltage

–

Battery temperature

Practically, the battery voltages before and after are compared and if they match (at the same battery

Compare data

Use SoC and parameters from the previously connected batetry

Yes

Matching battery?

No

Use new data and default battery parameters

temperature) the battery is considered the same. Connection Sequence done Confidential and Proprietary - Qualcomm Technologies, Inc. | MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION | 80-NH006-21 Rev. A

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HW Fuel Gauge: Interrupt The HW FG logic provides a set of programmable interrupts related to SoC/Battery status: −

SoC > High SoC Threshold

−

SoC < Low SoC Threshold

−

∆SoC > SoC Threshold

−

Battery full: Monotonic SoC = 100%

−

Battery Voltage < Voltage Threshold

Configurable interrupts: −

Monotonic SoC = 0% (SoC experienced by the user)

−

Battery Voltage < Configurable Empty Voltage

−

Monotonic SoC = 0% (SoC experienced by the user) OR Battery Voltage < Configurable Empty Voltage. The thresholds for the High SoC, Low SoC, Delta SoC and Battery voltage low

interrupts are user programmable.

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HW Fuel Gauge: Registers Register

Resolution

Comments

Monotonic SoC

16 bit

SyStem SoC filtered for slope and monotonicity

System SoC

16 bit

SoC adjusted to reflect the available charge and estimated 100 % point.

Battery SoC

24 bit

Raw Battery SoC estimate.

Estimated Battery Open Circuit Voltage

15 bit; 0V – 5V Range

The SMB FG algorithm is continuously updating the OCV estimate.

Battery ESR

0.1 % Resolution

Latest available estimate of the battery internal resistance.

Battery Voltage

15 bit; 0V – 5V Range

Battery Current

15 bit + sign ; 5A Range

Battery Temperature

Resolution: 0.0625 C

Temperature acquired trough the thermistor.

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HW FUEL GAUGE Performances

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HW Fuel Gauge: SoC Accuracy

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SoC Accuracy: Charging at 25°C Charging at 25°C 1500mAh

Conditions: Vin = 5.0 Termination Current = 100mA Pre-charge Current = 550mA Fast-charge Current = 600mA Pre-to-Fast Voltage = 2.2V

Input Current Limit = 1A

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SoC Accuracy: Discharging at 25°C Discharging at 25°C 1500mAh

Conditions: Vin = 5.0 Discharging Current = 750mA Cut-off-Voltage = 3.6V

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Deeply Discharged Battery

PASS

FAIL

6

3.8

Description

5

2

3.3

So C

3.2

0

3 1 15 29 43 57 71 85 99 113 127 141 155 169 183 197 211 225 239 253 267 281 295 309 323 337 351 365 379

SoC reported 0% until the OCV reaches the minimum value.

SoC is correctly reported 0% until, during charge action, the OCV is measured equal to minimum value for the battery.

6

0.6

5

0.4 0.2

4

Cutoff SOC Value = 3.2V

SOC(%)

0 3 -0.2 2

-0.4

1 S o…

0

-0.6 -0.8

1 15 29 43 57 71 85 99 113 127 141 155 169 183 197 211 225 239 253 267 281 295 309 323 337 351 365 379

•

3.4

3.1

Notes •

3.5 3

1

Pass/Fail Criteria •

3.6

Vbatt(V)

Insert deeply discharged battery and start operating with it.

4

Ibatt(A)

Procedure •

3.7

Verify algorithm when battery is deeply discharged.

SOC(%)

•

3.9

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SMB1360: Conclusions

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SMB1360: Conclusions •

The SMB1360 is the first QCOM product integrating a 1.5A SMPS charger with the HW Fuel Gauge newly developed by QCOM-Summit.

•

HW Fuel Gauge algorithm proved robust to the most demanding use cases.

•

HW Fuel Gauge’s SoC accuracy is reported in specs range. Validation and verification is still undergoing to provide full range of test cases at various temperatures.

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Thank You

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