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参数资料
| 型号： | ADP3401ARU |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 电源管理 |
| 英文描述： | 2nd Level Over Voltage Protection for 2, 3, or 4 Cell LiIon & LiPoly Batteries (2nd Lev Protection) 8-TSSOP -25 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO28 |
| 封装： | 6.10 MM, THERMALLY ENHANCED, TSSOP-28 |
| 文件页数： | 12/12页 |
| 文件大小： | 281K |
| 代理商： | ADP3401ARU |
–12–
REV. 0
C
P
ADP3401
For the lowest ripple and best efficiency, use a 0.1
μ
F, ceramic
capacitor for the charge pump flying capacitor (CAP+ and CAP–).
A good quality dielectric, such as X7R is recommended.
Setting the Charger Turn-On Threshold
The ADP3401 can be turned on when the charger input exceeds
a programmable threshold voltage. The charger’s threshold and
hysteresis are set by selecting the values for R1 and R2 shown in
Figure 15.
The turn-on threshold for the charger is calculated using:
V
R
R
R
R
R
V
CHR
HYS
HYS
T
=
+
×
×
+
×
2
2
1
1
Where
V
T
is the CHRON threshold voltage and
R
HYS
is the
CHRON hysteresis resistance.
The hysteresis is determined using:
V
V
R
R
HYS
T
HYS
=
×
1
Combining the above equations and solving for
R
1 and
R
2 gives
the following formulas:
R
R
V
V
HYS
T
HYS
1
=
×
R
R
R
V
V
R
R
HYS
CHR
T
HYS
2
1
1
1
=
×
×
Example:
R
1 = 10 k
and
R
2 = 30.2 k
gives a charger thresh-
old (not counting the drop in the power Schottky diode) of
3.5 V
±
160 mV with a 200 mV
±
30 mV hysteresis.
Charger Diode Selection
The diode shown in Figure 15 is used to prevent the battery from
discharging into the charger turn-on setting resistors, R1 and R2.
A Schottky diode is recommended to minimize the voltage differ-
ence from the charger to the battery and the power dissipation.
Choose a diode with a current rating high enough to handle both
the battery charging current and the current the ADP3401 will
draw if powered up during charging. The battery charging current
is dependent on the battery chemistry and the charger circuit.
The ADP3401 current will be dependent on the loading.
Printed Circuit Board Layout Considerations
Use the following general guidelines when designing printed
circuit boards:
1.Split the battery connection to the VBAT and SIMBAT
pins of the ADP3401. Use separate traces for each connection
and locate the input capacitors as close to the pins as possible.
2.SIM input and output capacitors should be returned to the
SIMGND and kept as close as possible to the ADP3401 to
minimize noise. Traces to the SIM charge pump capacitor
should be kept as short as possible to minimize noise.
3.VCCA and VTCXO capacitors should be returned to AGND.
4.VCC and VRTC capacitors should be returned to DGND.
5.Split the ground connections. Use separate traces or planes
for the analog, digital, and power grounds, and tie them
together at a single point, preferably close to the battery return.
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
28-Lead Thin Shrink Small Outline (TSSOP)
(RU-28A)
0.244 (6.20)
0.236 (6.00)
28
15
14
1
0.386 (9.80)
0.378 (9.60)
0.325 (8.25)
0.313 (7.95)
PIN 1
SEATING
PLANE
0.006 (0.15)
0.002 (0.05)
0.0118 (0.30)
0.0075 (0.19)
0.0256
(0.65)
BSC
0.0433 (1.10)
MAX
0.0374 (0.95)
0.0335 (0.85)
0.0078 (0.200)
0.0035 (0.090)
0.030 (0.75)
0.020 (0.50)
8
8
0
8
相关PDF资料 |
PDF描述 |
|---|---|
| ADP3402 | Replaced by BQ29412 : Voltage Protection for 2-,3-or,4-Cell Lion Batteries (2nd Protection) 8-SM8 -20 to 85 |
| ADP3402ARU | Replaced by BQ29412 : Voltage Protection for 2-,3-or,4-Cell Lion Batteries (2nd Protection) 8-SM8 |
| ADP3418KRZ-REEL1 | Dual Bootstrapped 12 V MOSFET Driver with Output Disable |
| ADP3418KRZ1 | Dual Bootstrapped 12 V MOSFET Driver with Output Disable |
| ADP3418 | Dual Bootstrapped 12 V MOSFET Driver with Output Disable |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3401ARU-REEL | 制造商:Analog Devices 功能描述:GSM Power Management System Li-Ion/NiMH 2.765V 28-Pin TSSOP T/R |
| ADP3401ARU-REEL OPT | 制造商:Analog Devices 功能描述: |
| ADP3402 | 制造商:AD 制造商全称:Analog Devices 功能描述:GSM Power Management System |
| ADP3402ARU | 制造商:AD 制造商全称:Analog Devices 功能描述:GSM Power Management System |
| ADP3402ARU-REEL | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:GSM POWER MANAGEMENT SYSTEM - Tape and Reel |
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