BQ25170J [TI]
适用于单节锂离子和磷酸铁锂电池、符合 JEITA 标准的 800mA 线性电池充电器;型号: | BQ25170J |
厂家: | TEXAS INSTRUMENTS |
描述: | 适用于单节锂离子和磷酸铁锂电池、符合 JEITA 标准的 800mA 线性电池充电器 电池 |
文件: | 总32页 (文件大小:3001K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
BQ25170J
ZHCSMW0 –OCTOBER 2021
BQ25170J:适用于单芯锂离子、锂聚合物和磷酸铁锂电池且符合JEITA 标准
的800mA 线性电池充电器
1 特性
3 说明
• 可承受高达30V 的输入电压
• 自动睡眠模式,可降低功耗
BQ25170J 是一款集成式 800mA 线性充电器,适用于
面向空间受限型便携式应用的单芯锂离子、锂聚合物和
磷酸铁锂电池。该器件具有为电池充电的单电源输出。
只要安全计时器期间内平均系统负载不会妨碍电池充满
电,就可以使系统负载与电池并联。当系统负载与电池
并联时,充电电流会由系统和电池共享。
– 350nA 电池泄漏电流
– 禁用充电时,输入泄漏电流为80µA
• 支持单芯锂离子、锂聚合物和磷酸铁锂电池
• 操作可使用外部电阻器进行编程
– 用于设置电池稳压电压的VSET:
• 锂离子电池:4.05V、4.1V、4.2V、4.35V、
4.4V
• 磷酸铁锂电池:3.5V、3.6V、3.7V
– 用于设置10mA 至800mA 充电电流的ISET
• 高精度
该器件分三个阶段为锂离子电池充电:对完全放电电池
进行恢复性充电的预充电阶段,为电池充上大部分电量
的恒流快速充电阶段,以及使电池电量充满的电压调节
阶段。
在所有充电阶段,内部控制环路都会监控 IC 结温,当
其超过内部温度阈值TREG 时,它会减少充电电流。
– 充电电压精度为±0.5%
– 充电电流精度为±10%
• 充电特性
充电器功率级和充电电流感测功能均完全集成。该充电
器具有高精度电流和电压调节环路功能、充电状态显示
和自动充电终止功能。充电电压和快速充电电流可通过
外部电阻编程设定。预充电和终止电流阈值由快速充电
电流设置决定。
– 预充电电流为20% ISET
– 用于控制充电过程在JEITA 标准范围内的TS 引
脚
– 终止电流为10% ISET
器件信息
– 用于监控电池温度的NTC 热敏电阻输入
– 用于控制充电功能的引脚
– 用于状态和故障指示的开漏输出
– 用于电源正常指示的开漏输出
• 集成故障保护
器件型号(1)
BQ25170J
封装尺寸(标称值)
封装
WSON (8)
2.0mm x 2.0mm
(1) 如需了解所有可用封装,请参阅数据表末尾的可订购产品附
录。
– 6.6V 输入过压保护
– 基于VSET 的输出过压保护
– 1000mA 过流保护
– 125°C 热调节;150°C 热关断保护
– OUT 短路保护
– VSET、ISET 引脚短路/开路保护
2 应用
• 真正无线耳机
• 可穿戴附件、智能手环
• 美容美发
简化版原理图
• 电动牙刷
• 车队管理、资产跟踪
本文档旨在为方便起见,提供有关TI 产品中文版本的信息,以确认产品的概要。有关适用的官方英文版本的最新信息,请访问
www.ti.com,其内容始终优先。TI 不保证翻译的准确性和有效性。在实际设计之前,请务必参考最新版本的英文版本。
English Data Sheet: SLUSEF8
BQ25170J
ZHCSMW0 –OCTOBER 2021
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Table of Contents
7.4 Device Functional Modes..........................................18
8 Application and Implementation..................................20
8.1 Application Information............................................. 20
8.2 Typical Applications.................................................. 20
9 Power Supply Recommendations................................24
10 Layout...........................................................................24
10.1 Layout Guidelines................................................... 24
10.2 Layout Example...................................................... 24
11 Device and Documentation Support..........................25
11.1 Device Support........................................................25
11.2 Receiving Notification of Documentation Updates..25
11.3 支持资源..................................................................25
11.4 Trademarks............................................................. 25
11.5 Electrostatic Discharge Caution..............................25
11.6 术语表..................................................................... 25
12 Mechanical, Packaging, and Orderable
1 特性................................................................................... 1
2 应用................................................................................... 1
3 说明................................................................................... 1
4 Revision History.............................................................. 2
5 Pin Configuration and Functions...................................3
6 Specifications.................................................................. 4
6.1 Absolute Maximum Ratings ....................................... 4
6.2 ESD Ratings .............................................................. 4
6.3 Recommended Operating Conditions ........................4
6.4 Thermal Information ...................................................5
6.5 Electrical Characteristics ............................................6
6.6 Timing Requirements .................................................8
6.7 Typical Characteristics................................................9
7 Detailed Description......................................................11
7.1 Overview................................................................... 11
7.2 Functional Block Diagram.........................................13
7.3 Feature Description...................................................14
Information.................................................................... 26
4 Revision History
DATE
REVISION
NOTES
October 2021
*
Initial Release
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5 Pin Configuration and Functions
图5-1. WSON Package 8-Pin Top View
表5-1. Pin Functions
PIN
I/O
DESCRIPTION
NAME
NUMBER
IN
1
P
Input power, connected to external DC supply. Bypass IN with at least 1-μF capacitor to GND,
placed close to the IC.
ISET
TS
2
3
I
I
Programs the device fast-charge current. External resistor from ISET to GND defines fast charge
current value. Expected range is 30 kΩ (10 mA) to 375 Ω (800 mA). ICHG = KISET / RISET
.
Precharge current is defined as 20% of ICHG. Termination current is defined as 10% of ICHG.
Temperature Qualification Voltage Input. Connect a negative temperature coefficient (NTC)
thermistor directly from TS to GND (AT103-2 recommended). Charge suspends when the TS pin
voltage is out of range. If TS function is not needed, connect an external 10-kΩresistor from this
pin to GND. Pulling TS < VTS_ENZ will disable the charger.
GND
STAT
4
5
Ground pin
–
O
Open drain charger status indication output. Connect to pull-up rail via 10-kΩresistor.
LOW indicates charge in progress. HIGH indicates charge complete or charge disabled. When a
fault condition is detected STAT pin blinks at 1 Hz.
PG
6
7
O
I
Open drain charge power good indication output. Connect to pull-up rail via 10-kΩresistor.
PG pulls low when VIN > VIN_LOWV and VOUT + VSLEEPZ < VIN < VIN_OV
.
VSET
Programs the regulation voltage for OUT pin with a pull-down resistor. Valid resistor range is 18 kΩ
to 100 kΩ, values outside this range will suspend charge. Refer to 节7.3.1.2 for voltage level
details. Recommend using ±1% tolerance resistor with <200 ppm/ºC temperature coefficient.
OUT
8
P
Battery Connection. System Load may be connected in parallel to battery. Bypass OUT with at least
1-μF capacitor to GND, placed close to the IC.
Thermal Pad
Exposed pad beneath the IC for heat dissipation. Solder thermal pad to the board with vias
connecting to solid GND plane.
—
—
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)
MIN
–0.3
–0.3
–0.3
MAX
30
UNIT
V
Voltage
IN
Voltage
OUT
13
V
Voltage
ISET, PG, STAT, TS, VSET
PG, STAT
5.5
5
V
Output Sink Current
mA
°C
°C
TJ
Junction temperature
Storage temperature
150
150
–40
–65
Tstg
(1) Stresses beyond those listed under Absolute Maximum Rating may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under
Recommended Operating Condition. Exposure to absolute-maximum-rated conditions for extended periods may affect device
reliability.
6.2 ESD Ratings
VALUE
UNIT
Human body model (HBM), per ANSI/ESDA/
JEDEC JS-001, all pins(1)
±2500
V(ESD)
Electrostatic discharge
V
Charged device model (CDM), per JEDEC
specification JESD22-C101, all pins(2)
±1500
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
NOM
MAX
6.6
UNIT
V
VIN
Input voltage
3.0
VOUT
Output voltage
4.4
V
IOUT
Output current
0.8
A
TJ
Junction temperature
IN capacitor
125
°C
–40
1
CIN
µF
COUT
RVSET
RVSET_TOL
RVSET_TEMPCO
RISET
RTS
OUT capacitor
1
µF
VSET resistor
18
-1
100
1
kΩ
%
Tolerance for VSET resistor
Temperature coefficient for VSET resistor
ISET resistor
200
30
ppm/℃
kΩ
kΩ
0.375
TS thermistor resistor (recommend 103AT-2)
10
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6.4 Thermal Information
BQ25170J
DSG
8 PINS
75.2
THERMAL METRIC(1)
UNIT
RθJA
Junction-to-ambient thermal resistance (JEDEC(1)
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
)
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
RθJC(top)
RθJB
93.4
41.8
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
3.8
ΨJT
41.7
ΨJB
RθJC(bot)
17.0
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
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6.5 Electrical Characteristics
3.0V < VIN < VIN_OV and VIN > VOUT + VSLEEP, TJ = -40°C to +125°C, and TJ = 25°C for typical values (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
QUIESCENT CURRENTS
OUT= 4.2V, IN floating or IN = 0V - 5V,
Charge Disabled, TJ = 25 °C
0.350
0.350
80
0.6 µA
0.8 µA
110 µA
µA
IQ_OUT
Quiescent output current (OUT)
OUT= 4.2V, IN floating or IN = 0V - 5V,
Charge Disabled, TJ < 105 °C
Shutdown input current (IN) with
charge disabled via TS pin
IN = 5V, Charge Disabled (VTS < VTS_ENZ),
no battery
ISD_IN_TS
ISTANDBY_IN
IQ_IN
Standby input current (IN) with charge
terminated
IN = 5V, Charge Enabled, charge terminated
190
IN = 5V, OUT = 3.8V, Charge Enabled,
ICHG = 0A
Quiescent input current (IN)
0.45
0.6 mA
INPUT
VIN_OP
IN operating range
3.0
3.05
2.80
95
6.6
3.15
3.10
V
V
V
VIN_LOWV
VIN_LOWV
VSLEEPZ
VSLEEP
VIN_OV
IN voltage to start charging
IN voltage to stop charging
Exit sleep mode threshold
Sleep mode threshold hysteresis
VIN overvoltage rising threshold
VIN overvoltage falling threshold
IN rising
3.09
2.95
135
80
IN falling
IN rising, VIN - VOUT, OUT = 4V
IN falling, VIN - VOUT, OUT = 4V
IN rising
175 mV
mV
6.60
6.75
6.63
6.90
V
V
VIN_OVZ
IN falling
CONFIGURATION PINS SHORT/OPEN PROTECTION
RISET below this at startup, charger does not
initiate charge, power cycle or TS toggle to
reset
Highest resistor value considered
short
RISET_SHORT
350
2.8
Ω
RVSET below this at startup, charger does
not initiate charge, power cycle or TS toggle
to reset
Highest resistor value considered
short
RVSET_SHORT
kΩ
kΩ
RVSET above this at startup, charger does
Lowest resistor value considered open not initiate charge, power cycle or TS toggle
to reset
RVSET_OPEN
120
BATTERY CHARGER
VDO
Dropout voltage (VIN - VOUT
)
VIN falling, VOUT = 4.35V, IOUT = 500mA
Tj = 25℃, all VSET settings
425
300
mV
%
0.5
0.8
–0.5
–0.8
OUT charge voltage regulation
accuracy
VREG_ACC
%
Tj = -40℃to 125℃, all VSET settings
Typical charge current regulation
range
ICHG_RANGE
KISET
VOUT > VBAT_LOWV
10
800 mA
330
Charge current setting factor, ICHG
KISET / RISET
=
10mA < ICHG < 800mA
270
AΩ
720
450
90
800
500
100
10
880 mA
550 mA
110 mA
11 mA
RISET = 375Ω, OUT = 3.8V
RISET = 600Ω, OUT = 3.8V
RISET = 3.0kΩ, OUT = 3.8V
RISET = 30kΩ, OUT = 3.8V
ICHG_ACC
Charge current accuracy
9
Typical pre-charge current, as
percentage of ICHG
IPRECHG
VOUT < VBAT_LOWV
20
%
144
85
160
100
20
176 mA
110 mA
22 mA
2.6 mA
RISET = 375Ω, OUT = 2.5V
RISET = 600Ω, OUT = 2.5V
RISET = 3.0kΩ, OUT = 2.5V
RISET = 30kΩ, OUT = 2.5V
IPRECHG_ACC
Precharge current accuracy
18
1.4
2
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6.5 Electrical Characteristics (continued)
3.0V < VIN < VIN_OV and VIN > VOUT + VSLEEP, TJ = -40°C to +125°C, and TJ = 25°C for typical values (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
Typical termination current, as
percentage of ICHG
ITERM
VOUT = VREG
10
%
45
8.5
0.4
50
10
1
55 mA
11.5 mA
1.6 mA
RISET = 600Ω, OUT = VREG = 4.2V
RISET = 3.0kΩ, OUT = VREG = 4.2V
RISET =30kΩ, OUT = VREG = 4.2V
ITERM_ACC
Termination current accuracy
Output (OUT) short circuit voltage
rising threshold, for Li-Ion chemistry
VBAT_SHORT
OUT rising, VSET configured for Li-Ion
OUT rising, VSET configured for LiFePO4
2.1
1.1
2.2
1.2
2.3
1.3
V
V
Output (OUT) short circuit voltage
rising threshold, for LiFePO4
chemistry
VBAT_SHORT
Output (OUT) short circuit voltage
hysteresis
VBAT_SHORT_HYS
IBAT_SHORT
OUT falling
200
16
mV
OUT short circuit charging current
VOUT < VBAT_SHORT
12
20 mA
Pre-charge to fast-charge transition
threshold, for Li-Ion chemistry
VBAT_LOWV
OUT rising, VSET configured for Li-Ion
2.7
2.8
3.0
2.1
V
Pre-charge to fast-charge transition
threshold for Li-FePO4 chemistry
VBAT_LOWV
VBAT_LOWV_HYS
VRECHG
OUT rising, VSET configured for LiFePO4
OUT falling
1.9
2.0
100
100
V
Battery LOWV hysteresis
mV
Battery recharge threshold for Li-Ion
chemistry
OUT falling, VSET configured for Li-
IonVREG_ACC - VOUT
75
125 mV
225 mV
Battery recharge threshold for
LiFePO4 chemistry
OUT falling, VSET configured for LiFePO4,
VREG_ACC - VOUT
VRECHG
175
200
IOUT = 400mA, TJ = 25°C
845
845
1000
1450
mΩ
mΩ
RON
Charging path FET on-resistance
IOUT = 400mA, TJ = -40 - 125°C
BATTERY CHARGER PROTECTION
VOUT_OVP
VOUT_OVP
IOUT_OCP
OUT overvoltage rising threshold
VOUT rising, as percentage of VSET
VOUT falling, as percentage of VSET
IOUT rising
103
101
0.9
104
102
1
105
103
1.1
%
%
A
OUT overvoltage falling threshold
Output current limit threshold
TEMPERATURE REGULATION AND TEMPERATURE SHUTDOWN
Typical junction temperature
regulation
TREG
125
°C
Thermal shutdown rising threshold
Thermal shutdown falling threshold
Temperature increasing
150
135
°C
°C
TSHUT
Temperature decreasing
BATTERY-PACK NTC MONITOR
ITS_BIAS TS nominal bias current
36.5
0.99
38
39.5 µA
Cool to cold temperature theshold;
Charge disabled
TS rising (approx. 0°C)
TS falling (approx. 4°C)
1.04
1.09
0.93
V
V
VCOLD
Cold to cool temperature threshold;
Charge current target increased to
20% x ISET
0.83
650
580
0.88
680
610
Normal to cool temperature threshold;
Charge current target reduced to 20% TS rising (approx. 10°C)
x ISET
710 mV
640 mV
VCOOL
Cool to normal temperature threshold;
Charge current target increased to
ISET
TS falling (approx. 13°C)
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6.5 Electrical Characteristics (continued)
3.0V < VIN < VIN_OV and VIN > VOUT + VSLEEP, TJ = -40°C to +125°C, and TJ = 25°C for typical values (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
Normal to warm temperature
threshold; Charge current target
reduced to 50% x ISET; VREG reduced
to 4.1V for VSET = 4.2 V, 4.35 V, 4.4 V
TS falling (approx. 45°C)
176
188
200 mV
VWARM
Warm to normal temperature
threshold; Charge current target
increased to ISET; VREG increased to
VSET for VSET = 4.2 V, 4.35 V, 4.4 V
TS rising (approx. 40°C)
TS falling (approx. 55°C)
TS rising (approx. 51°C)
208
125
148
40
220
135
158
50
232 mV
145 mV
168 mV
Warm to hot temperature threshold;
charge disabled
Hot to warm temperature threshold;
Charge current target increased to
50% x ISET; VREG set to 4.1V for
VSET = 4.2 V, 4.35 V, 4.4 V
VHOT
Charger shutdown threshold; IC
enters shutdown mode
VTS_ENZ
VTS_EN
TS falling
TS rising
60 mV
85 mV
Charge enable threshold; Crossing
this threshold restarts IC operation
65
75
VTS_CLAMP
ITS_LEAK
TS maximum voltage clamp
TS pin high-level leakage
TS open-circuit (float)
Pull-up rail 1.8V
2.3
2.6
2.9
1
V
µA
LOGIC OUTPUT PIN (STAT, PG)
VOL
Output low threshold level
High-level leakage current
Sink current = 5mA
Pull up rail 3.3V
0.4
1
V
IOUT_BIAS
µA
6.6 Timing Requirements
MIN
NOM
MAX
UNIT
BATTERY CHARGER
tTS_DUTY_ON
tTS_DUTY_OFF
tOUT_OCP_DGL
tPRECHG
TS turn-on time during TS duty cycle mode
TS turn-off time during TS duty cycle mode
100
2
ms
s
Deglitch time for IOUT_OCP, IOUT rising
Pre-charge safety timer accuracy
Fast-charge safety timer accuracy
100
30
10
µs
min
hr
28.5
9.5
31.5
10.5
tSAFETY
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6.7 Typical Characteristics
CIN = 1 µF, COUT = 1 µF, VIN = 5 V, VOUT = 3.8 V (unless otherwise specified)
IOUT = 10 mA
VOUT = 4.2 V
VIN = 5 V
VOUT = 4.2 V
图6-1. Line Regulation
图6-2. Load Regulation
VIN = 5 V
Temp = 25ºC
VIN = 5 V
VOUT = 3.8 V
图6-3. ICHG Accuracy vs. VOUT
图6-4. ICHG Accuracy vs. Temperature
图6-6. Dropout Voltage vs. Output Current
IOUT = 10 mA
图6-5. VSET Accuracy vs. Temperature
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ICHG = 0 A
VOUT = 0 V
TS Pin = LOW
VOUT = 0 V
图6-8. Input Quiescent Current vs. Input Voltage
图6-7. Input Shutdown Current vs. Input Voltage
VOUT = 4.35 V
VIN = 0 V
图6-10. Termination Current Accuracy vs.
图6-9. Output Quiescent Current vs. Output
Termination Current Setting
Voltage
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7 Detailed Description
7.1 Overview
The BQ25170J is an integrated 800-mA linear charger for 1-cell Li-Ion, Li-Polymer, and LiFePO4 batteries. The
device has a single power output that charges the battery. The system load can be placed in parallel with the
battery, as long as the average system load does not prevent the battery from charging fully within the safety
timer duration. When the system load is placed in parallel with the battery, the input current is shared between
the system and the battery.
The device has three phases for charging a Li-Ion battery: precharge to recover a fully discharged battery, fast-
charge constant current to supply the bulk of the charge, and voltage regulation to reach full capacity.
The charger includes flexibility in programming of the fast-charge current and regulation voltage. This charger is
designed to work with a standard USB connection or dedicated charging adapter (DC output).
The charger also comes with a full set of safety features: battery temperature monitoring, overvoltage protection,
charge safety timers, and configuration pin (VSET, ISET) short and open protection. All of these features and
more are described in detail below.
The charger is designed for a single path from the input to the output to charge the battery. Upon application of a
valid input power source, the configuration pins are checked for short/open circuit.
If the Li-Ion battery voltage is below the VBAT_LOWV threshold, the battery is considered discharged and a
preconditioning cycle begins. The amount of precharge current is 20% of the programmed fast-charge current
via ISET pin. The tPRECHG safety timer is active, and stops charging after expiration if battery voltage fails to rise
above VBAT_LOWV
.
Once the battery has charged to the VBAT_LOWV threshold, Fast Charge Mode is initiated, applying the fast
charge current and starting the tSAFETY timer. The fast charge constant current is programmed using the ISET
pin. The constant current phase provides the bulk of the charge. Power dissipation in the IC is greatest in fast
charge with a lower battery voltage. If the IC temperature reaches TREG, the IC enters thermal regulation, slows
the timer clock by half, and reduces the charge current as needed to keep the temperature from rising any
further. 图 7-1 shows the typical Lithium battery charging profile with thermal regulation. Under normal operating
conditions, the IC’s junction temperature is less than TREG and thermal regulation is not entered.
Once the battery has charged to the regulation voltage, the voltage loop takes control and holds the battery at
the regulation voltage until the current tapers to the termination threshold. The termination threshold is 10% of
the programmed fast-charge current.
Further details are described in 节7.3.
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Thermal
Regulation
Phase
Current
Regulation
Phase
Voltage Regulation and
Charge Termination
Phase
Pre-
Conditioning
Phase
DONE
V
REG
I
CHG
Battery Current,
I
FAST-CHARGE
CURRENT
OUT
Battery
Voltage,
V
OUT
Charge
Complete
Status,
Charger
Off
PRE-CHARGE
CURRENT AND
TERMINATION
THRESHOLD
V
BAT_LOWV
I
TERM
I
PRECHG
T
REG
0A
Temperature, Tj
t
t
DONE
PRECHG
SAFETY
图7-1. Lithium-Ion Battery Charging Profile with Thermal Regulation
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7.2 Functional Block Diagram
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7.3 Feature Description
7.3.1 Device Power Up from Input Source
When an input source is plugged in and charge is enabled, the device checks the input source voltage to turn on
all the bias circuits. It detects and sets the charge current and charge voltage limits before the linear regulator is
started. The power up sequence from input source is as listed:
1. ISET pin detection
2. VSET pin detection to select charge voltage
3. Charger power up
7.3.1.1 ISET Pin Detection
After a valid VIN is plugged in, the device checks the resistor on the ISET pin for a short circuit (RISET
<
RISET_SHORT). If a short condition is detected, the charger remains in the FAULT state until the input or TS pin is
toggled. If the ISET pin is open-circuit, the charger proceeds through pin detection and starts the charger with no
charge current. This pin is monitored while charging and changes in RISET while the charger is operating will
immediately translate to changes in charge current.
An external pulldown resistor (±1% or better recommended to minimize charge current error) from ISET pin to
GND sets the charge current as:
KISET
ICHG
=
RISET
(1)
where
• ICHG is the desired fast-charge current
• KISET is a gain factor found in the electrical specifications
• RISET is the pulldown resistor from ISET pin to GND
For charge currents below 50 mA, an extra RC circuit is recommended on ISET to achieve more stable current
signal. For greater accuracy at lower currents, part of the current-sensing FET is disabled to give better
resolution.
7.3.1.2 VSET Pin Detection
VSET pin is used to program the device regulation voltage at end-of-charge using a ±1% pulldown resistor. The
available pulldown resistor and corresponding charging levels are:
表7-1. VSET Pin Resistor Value Table
RESISTOR
> 150 kΩ
100 kΩ
82 kΩ
CHARGE VOLTAGE (V)
No Charge (open-circuit)
1-cell LiFePO4: 3.50 V
1-cell LiFePO4: 3.60 V
1-cell LiFePO4: 3.70 V
1-cell LiIon: 4.05 V
62 kΩ
47 kΩ
1-cell LiIon: 4.10 V
36 kΩ
1-cell LiIon: 4.20 V
27 kΩ
1-cell LiIon: 4.35 V
24 kΩ
1-cell LiIon: 4.40 V
18 kΩ
No Charge (short-circuit)
< 3.0 kΩ
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If either a short- or open-circuit condition is detected, charger stops operation and remains in the FAULT state
until the input or TS pin is toggled.
Once a valid resistor value has been detected, the corresponding charge voltage is latched in and the pin is not
continuously monitored during operation. A change in this pin will not be acknowledged by the IC until the input
supply or TS pin is toggled.
7.3.1.3 Charger Power Up
After VSET, ISET pin resistor values have been validated, the device proceeds to enable the charger. The
device automatically begins operation at the correct stage of battery charging depending on the OUT voltage.
7.3.2 Battery Charging Features
When charge is enabled , the device automatically completes a charging cycle according to the settings on
VSET, ISET pins without any intervention. The lithium-based charging cycle is automatically terminated when the
charging current is below termination threshold, charge voltage is above recharge threshold, and device is not in
thermal regulation (TREG). When a full battery is discharged below the recharge threshold (VRECHG), the device
automatically starts a new charging cycle. After charge is done, toggling the input supply or the TS pin can
initiate a new charging cycle.
7.3.2.1 Lithium-Ion Battery Charging Profile
The device charges a lithium based battery in four phases: trickle charge, precharge, constant current and
constant voltage. At the beginning of a charging cycle, the device checks the battery voltage and regulates
current and voltage accordingly.
If the charger is in thermal regulation during charging, the actual charging current will be less than the
programmed value. In this case, termination is temporarily disabled and the charging safety timer is counted at
half the clock rate. For more information, refer to 节7.3.2.3.
Regulation Voltage
VSET
VRECHG
Battery Voltage
Charge Current
ISET
Charge Current
VBAT_LOWV
VBAT_SHORT
IPRECHG = ISET x 20%
ITERM = ISET x 10%
IBAT_SHORT
Trickle Charge
Pre-charge
Re-
charge
Fast-Charge
CC
Taper-Charge
CV
Charge
Done
Precharge Timer
(30min)
Safety Timer
(10hr)
图7-2. Battery Charging Profile
7.3.2.2 Charge Termination and Battery Recharge
device terminates a charge cycle when the OUT pin voltage is above the recharge threshold (VRECHG), and the
current is below the termination threshold (ITERM). Termination is temporarily disabled when the charger device is
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in thermal regulation. After charge termination is detected, the linear regulator turns off and the device enters
STANDBY state. Once the OUT pin drops below the VRECHG threshold, a new charge cycle is automatically
initiated.
7.3.2.3 Charging Safety Timers
The device has built-in safety timers to prevent an extended charging cycle due to abnormal battery conditions.
The precharge timer is fixed at 30 minutes. The fast-charge safety timer is fixed at 10 hours. When safety timer
expires, the charge cycle ends. A toggle on the input supply or TS pin is required to restart a charge cycle after
the safety timer has expired.
During thermal regulation, the safety timer counts at half clock rate as the actual charge current is likely to be
below the ISET setting. For example, if the charger is in thermal regulation throughout the whole charging cycle,
and the safety timer is 10 hours, then the timer will expire in 20 hours.
During faults which disable charging, such as VIN OVP, BAT OVP, TSHUT or TS faults, the timer is suspended.
Once the fault goes away, charging and the safety timer resumes. If the charging cycle is stopped and started
again, the timer gets reset (toggle TS pin restarts the timer).
The safety timer restarts counting for the following events:
1. Charging cycle stop and restart (toggle TS pin, charged battery falls below recharge threshold, or toggle
input supply)
2. OUT pin voltage crosses the VBAT_LOWV threshold in either direction
The precharge safety timer (fixed counter that runs when VOUT < VBAT_LOWV), follows the same rules as the fast-
charge safety timer in terms of getting suspended, reset, and counting at half-rate.
7.3.2.4 Battery Temperature Qualification (TS Pin)
While charging, the device continuously monitors battery temperature by sensing the voltage at the TS pin. A
negative temperature coefficient (NTC) thermistor should be connected between the TS and GND pins
(recommend: 103AT-2). If temperature sensing is not required in the application, connect a fixed 10-kΩ resistor
from TS to GND to allow normal operation.
The TS function for BQ25170J is designed to follow the JEITA temperature standard for Li-Ion and Li-Poly
batteries; charge current (ISET) and regulation voltage (VREG) are reduced based on battery temp (TS). There
are four thresholds, Hot-55C, Warm-45C, Cool-10C and Cold-0C.
Normal operation occurs between 10C and 45C, charge current and voltage will be the normal values. When
battery is in the Cool temperature range, between 0C and 10C, the charger current level is 20% of ISET value
and regulation voltage is not changed. When the battery is in the Warm temperature range, between 45C and
55C, ISET is reduced by 50% and regulation voltage is reduced to 4.1V for VSET settings greater than 4.1V.
Regulation voltage is not reduced during the Warm region for VSET settings less than or equal to 4.1V. Charge
is suspended below Cold temp of 0C and above Hot temp of 55C. When charge is suspended device enters the
STANDBY state, and blinks the STAT pin. Once battery temperature returns to normal conditions, charging
resumes automatically. See 图7-3.
When charge current is reduced during Cool or Warm temp the safety timer runs at half the clock rate.
图7-3. Standard JEITA Profile figure
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In addition to battery temperature sensing, the TS pin can be used to disable the charger at any time by pulling
TS voltage below VTS_ENZ. The device disables the charger and consumes ISD_IN_TS from the input supply. In
order to minimize quiescent current, the TS current source (ITS_BIAS) is duty-cycled, with an on-time of
tTS_DUTY_ON and an off time of tTS_DUTY_OFF. After the TS pin pull-down is released, the device may take up to
tTS_DUTY_OFF to turn the ITS_BIAS back on. After the source is turned on, the TS pin voltage will go above VTS_EN
,
and re-enable the charger operation. The device treats this TS pin toggle as an input supply toggle, triggering
Device Power Up From Input Source (节7.3.1).
7.3.3 Status Outputs ( PG, STAT)
7.3.3.1 Power Good Indicator (PG Pin)
This open-drain pin pulls LOW to indicate a good input source when:
1. VIN above VIN_LOWV
2. VIN above VOUT + VSLEEPZ (not in SLEEP)
3. VIN below VIN_OV
7.3.3.2 Charging Status Indicator (STAT)
The device indicates the charging state on the open-drain STAT pin. This pin can drive an LED.
表7-2. STAT pin state
CHARGING STATE
STAT PIN STATE
HIGH
Charge completed, charger in sleep mode or charge disabled (VTS
<
VTS_ENZ
)
Charge in progress (including automatic recharge)
LOW
Fault (VIN OVP, BAT OVP, BAT OCP, TS HOT, TS COLD, TMR_EXP,
VSET pin short/open or ISET pin short)
BLINK at 1Hz
7.3.4 Protection Features
The device closely monitors input and output voltage, as well as internal FET current and temperature for safe
linear regulator operation.
7.3.4.1 Input Overvoltage Protection (VIN OVP)
If the voltage at IN pin exceeds VIN_OV, the device turns off after a deglitch, tVIN_OV_DGL. The safety timer
suspends count and device enters STANDBY mode. Once the IN voltage recovers to normal level, the charge
cycle and the safety timer automatically resume operation.
7.3.4.2 Output Overvoltage Protection (BAT OVP)
If the voltage at OUT pin exceeds VOUT_OVP, the device immediately stops charging. The safety timer suspends
count and device enters STANDBY mode. Once the OUT voltage recovers to normal level, the charge cycle and
the safety timer resume operation.
7.3.4.3 Output Overcurrent Protection (BAT OCP)
During normal operation, the OUT current should be regulated to ISET programmed value. However, if a short
circuit occurs on ISET pin, the OUT current may rise to unintended level. If the current at OUT pin exceeds
IOUT_OCP, the device turns off after a deglitch, tOUT_OCP_DGL. The safety timer resets the count, and device
remains latched off. An input supply or TS pin toggle is required to restart operation.
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IOUT_OCP
ICHG
tOUT_OCP_DGL
RISET
Short Circuit
event on ISET
Charger
latched off
图7-4. Overcurrent Protection
7.3.4.4 Thermal Regulation and Thermal Shutdown (TREG and TSHUT)
The device monitors its internal junction temperature (TJ) to avoid overheating and to limit the IC surface
temperature. When the internal junction temperature exceeds the thermal regulation limit, the device
automatically reduces the charge current to maintain the junction temperature at the thermal regulation limit
(TREG). During thermal regulation, the actual charging current is usually below the programmed value on the
ISET pin. Therefore, the termination comparator for the Lithium-Ion battery is disabled, and the safety timer runs
at half the clock rate.
Additionally, the device has thermal shutdown to turn off the linear regulator when the IC junction temperature
exceeds the TSHUT threshold. The charger resumes operation when the IC die temperature decreases below
the TSHUT falling threshold.
7.4 Device Functional Modes
7.4.1 Shutdown or Undervoltage Lockout (UVLO)
The device is in shutdown state if the IN pin voltage is less than VIN_LOWV, or the TS pin is below VTS_ENZ. The
internal circuitry is powered down, all the pins are high impedance, and the device draws ISD_IN_TS from the input
supply. Once the IN voltage rises above the VIN_LOW threshold and the TS pin is above VTS_EN, the IC will enter
Sleep Mode or Active Mode depending on the OUT pin voltage.
7.4.2 Sleep Mode
The device is in Sleep Mode when VIN_LOWV < VIN < VOUT + VSLEEPZ. The device waits for the input voltage to
rise above VOUT + VSLEEPZ to start operation.
7.4.3 Active Mode
The device is powered up and charges the battery when the TS pin is above VTS_ENZ and the IN voltage ramps
above both VIN_LOWV, and VOUT + VSLEEPZ. The device draws IQ_IN from the supply to bias the internal circuitry.
For details on device power-up sequence, refer to 节7.3.1.
7.4.3.1 Standby Mode
The device is in Standby Mode if a valid input supply is present and charge is terminated or if a recoverable fault
is detected. The internal circuitry is partially biased, and the device continues to monitor for either VOUT to drop
below VRECHG, or the recoverable fault to be removed.
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7.4.4 Fault Mode
The fault conditions are categorized into recoverable and nonrecoverable as follows:
• Recoverable, from which the device should automatically recover once the fault condition is removed:
– VIN OVP
– BAT OVP
– TS HOT
– TS COLD
• Nonrecoverable, requiring TS pin or input supply toggle to resume operation:
– BAT OCP
– ISET pin short detected
– VSET pin short/open detected
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8 Application and Implementation
Note
Information in the following applications sections is not part of the TI component specification, and TI
does not warrant its accuracy or completeness. TI’s customers are responsible for determining
suitability of components for their purposes, as well as validating and testing their design
implementation to confirm system functionality.
8.1 Application Information
A typical application consists of the device configured as a standalone battery charger for single-cell Lithium-Ion,
Li-Polymer, or LiFePO4 chemistries. The charge voltage and number of cells is configured using a pull-down
resistor on the VSET pin. The charge current is configured using a pull-down resistor on the ISET pin. A battery
thermistor may be connected to the TS pin to allow the device to monitor battery temperature and control
charging. Pulling the TS pin below VTS_ENZ disables the charging function. The charger and input supply status
is reported via the STAT and PG pins.
8.2 Typical Applications
8.2.1 Li-Ion Charger Design Example
图8-1. BQ25170J Typical Application for Li-Ion Charging at 500 mA
8.2.1.1 Design Requirements
• Supply voltage = 5 V
• Battery is single-cell Li-Ion
• Fast charge current: ICHG = 500 mA
• Charge Voltage: VREG = 4.35 V
• Termination Current: ITERM = 10% of ICHG or 50 mA
• Pre-charge Current: IPRECHG = 20% of ICHG or 100 mA
• TS –Battery Temperature Sense = 10-kΩNTC (103AT)
• TS pin can be pulled down to disable charging
8.2.1.2 Detailed Design Procedure
The regulation voltage is set via the VSET pin to 4.35 V, the input voltage is 5 V and the charge current is
programmed via the ISET pin to 500 mA.
RISET = [KISET / ICHG
]
from electrical characteristics table. . . KISET= 300 AΩ
RISET = [300 AΩ/0.5 A] = 600 Ω
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Selecting the closest 1% resistor standard value, use a 604-Ω resistor between ISET and GND, for an expected
ICHG 497 mA.
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8.2.1.3 Application Curves
CIN = 1 µF, COUT = 1 µF, VIN = 5 V, VOUT = 3.8 V, ICHG = 250 mA (unless otherwise specified)
OUT = open-circuit
RISET = 1.2 kΩ
RISET = 1.2 kΩ
图8-2. Power Up With Battery
图8-3. Power Up Without Battery
TS pulled LOW
VIN = 5 V →0 V
图8-5. Charge Disable
图8-4. Power Down
TS pin released
VIN = 5 V →10 V →5 V
图8-6. Charge Enable
图8-7. IN OVP Response
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VOUT = 3.5 V
VOUT = VSET = 4.2 V
VIN = 4 V →6 V
ISYS = 0 mA →500 mA
图8-8. IN Transient Response
图8-9. OUT Transient Response
VOUT = 4.0 V →0 V
ISET = 1.2 kΩ→0
Ω
图8-10. OUT Short-Circuit Response
图8-11. ISET Short-Circuit Response
VTS Sweep from Cold Shutdown, Cool, Normal, Warm, Hot
Shutdown
ISET = 50 mA →500 mA
图8-12. ISET Change Response
图8-13. TS Change Response
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9 Power Supply Recommendations
The device is designed to operate from an input voltage supply range between 3.0 V and 6.6 V (up to 30 V
tolerant) and current capability of at least the maximum designed charge current. If located more than a few
inches from the IN and GND pins, a larger capacitor is recommended.
10 Layout
10.1 Layout Guidelines
To obtain optimal performance, the decoupling capacitor from IN to GND and the output filter capacitor from OUT
to GND should be placed as close as possible to the device, with short trace runs to both IN, OUT and GND.
• All low-current GND connections should be kept separate from the high-current charge or discharge paths
from the battery. Use a single-point ground technique incorporating both the small signal ground path and the
power ground path.
• The high current charge paths into IN pin and from the OUT pin must be sized appropriately for the maximum
charge current in order to avoid voltage drops in these traces.
10.2 Layout Example
IN
GND
OUT
VREF
IN
OUT
VSET
/PG
0402
/PG
0402
STAT
ISET
TS
0402
VSET
GND
STAT
GND
图10-1. Board Layout Example
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11 Device and Documentation Support
11.1 Device Support
11.1.1 第三方产品免责声明
TI 发布的与第三方产品或服务有关的信息,不能构成与此类产品或服务或保修的适用性有关的认可,不能构成此
类产品或服务单独或与任何TI 产品或服务一起的表示或认可。
11.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
11.3 支持资源
TI E2E™ 支持论坛是工程师的重要参考资料,可直接从专家获得快速、经过验证的解答和设计帮助。搜索现有解
答或提出自己的问题可获得所需的快速设计帮助。
链接的内容由各个贡献者“按原样”提供。这些内容并不构成 TI 技术规范,并且不一定反映 TI 的观点;请参阅
TI 的《使用条款》。
11.4 Trademarks
TI E2E™ is a trademark of Texas Instruments.
所有商标均为其各自所有者的财产。
11.5 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled
with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric changes could cause the device not to meet its published
specifications.
11.6 术语表
TI 术语表
本术语表列出并解释了术语、首字母缩略词和定义。
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12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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12-Apr-2023
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
BQ25170JDSGR
ACTIVE
WSON
DSG
8
3000 RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
170J
Samples
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
GENERIC PACKAGE VIEW
DSG 8
2 x 2, 0.5 mm pitch
WSON - 0.8 mm max height
PLASTIC SMALL OUTLINE - NO LEAD
This image is a representation of the package family, actual package may vary.
Refer to the product data sheet for package details.
4224783/A
www.ti.com
PACKAGE OUTLINE
DSG0008A
WSON - 0.8 mm max height
SCALE 5.500
PLASTIC SMALL OUTLINE - NO LEAD
2.1
1.9
B
A
0.32
0.18
PIN 1 INDEX AREA
2.1
1.9
0.4
0.2
ALTERNATIVE TERMINAL SHAPE
TYPICAL
0.8
0.7
C
SEATING PLANE
0.05
0.00
SIDE WALL
0.08 C
METAL THICKNESS
DIM A
OPTION 1
0.1
OPTION 2
0.2
EXPOSED
THERMAL PAD
(DIM A) TYP
0.9 0.1
5
4
6X 0.5
2X
1.5
9
1.6 0.1
8
1
0.32
0.18
PIN 1 ID
(45 X 0.25)
8X
0.4
0.2
8X
0.1
C A B
C
0.05
4218900/E 08/2022
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. The package thermal pad must be soldered to the printed circuit board for thermal and mechanical performance.
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EXAMPLE BOARD LAYOUT
DSG0008A
WSON - 0.8 mm max height
PLASTIC SMALL OUTLINE - NO LEAD
(0.9)
(
0.2) VIA
8X (0.5)
TYP
1
8
8X (0.25)
(0.55)
SYMM
9
(1.6)
6X (0.5)
5
4
SYMM
(1.9)
(R0.05) TYP
LAND PATTERN EXAMPLE
SCALE:20X
0.07 MIN
ALL AROUND
0.07 MAX
ALL AROUND
SOLDER MASK
OPENING
METAL
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
NON SOLDER MASK
DEFINED
SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
4218900/E 08/2022
NOTES: (continued)
4. This package is designed to be soldered to a thermal pad on the board. For more information, see Texas Instruments literature
number SLUA271 (www.ti.com/lit/slua271).
5. Vias are optional depending on application, refer to device data sheet. If any vias are implemented, refer to their locations shown
on this view. It is recommended that vias under paste be filled, plugged or tented.
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EXAMPLE STENCIL DESIGN
DSG0008A
WSON - 0.8 mm max height
PLASTIC SMALL OUTLINE - NO LEAD
8X (0.5)
METAL
8
SYMM
1
8X (0.25)
(0.45)
SYMM
9
(0.7)
6X (0.5)
5
4
(R0.05) TYP
(0.9)
(1.9)
SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
EXPOSED PAD 9:
87% PRINTED SOLDER COVERAGE BY AREA UNDER PACKAGE
SCALE:25X
4218900/E 08/2022
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
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