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參數(shù)資料
| 型號： | ADP3405 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Replaced by BQ29412 : Voltage Protection for 2-,3-or,4-Cell Lion Batteries (2nd Protection) 8-TSSOP -20 to 85 |
| 中文描述： | 手機電源管理系統(tǒng) |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 152K |
| 代理商： | ADP3405 |
ADP3405
–9–
REV. 0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
CHRON
ROWX
PWRONIN
ANALOGON
VCC
VBAT
VTCXO
RESET
AGND
VCCA
REFOUT
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ADP3405
VRTC
CAP
–
PWRONKEY
RESCAP
DGND
TSSOP-28
DIGITAL AND
SIM GND
ANALOG GND
SIM PINS
OF
GSM PROCESSOR
GSM
PROCESSOR
RST TO SIM CARD
I/O TO SIM CARD
CLK TO SIM CARD
10 F
100nF
BACK-UP
COIN CELL
100nF
GSM
PROCESSOR
CHARGER
INPUT
1 LI-ION
OR
3 NIMH
10 F
100nF
100nF
2.2 F
0.22 F
10
2.2 F
R1
R2
10 F
SIMBAT
DATAIO
RESETIN
CLKIN
SIMGND
CAP+
VSIM
CLK
SIMON
I/O
RST
SIMPROG
Figure 2. Typical Application Circuit
FREQUENCY
–
Hz
600
500
010
100k
100
V
–
1k
10k
400
300
200
100
FULL LOAD
MLCC CAPS
VCCA
TCXO
REF
TPC 13. Output Noise Density
THEORY OF OPERATION
The ADP3405 is a power management chip optimized for use with
the AD20msp425 GSM baseband chipsets in handset applications.
Figure 1 shows a functional block diagram of the ADP3405.
The ADP3405 contains several blocks:
Four Low Dropout Regulators (Digital, Analog, Crystal
Oscillator, Real-Time Clock)
Reset Generator
Buffered Precision Reference
SIM Interface Logic Level Translation (3 V/5 V)
SIM Voltage Supply
Power-On/-Off Logic
Undervoltage Lockout
These functions have traditionally been done as either a discrete
implementation or a custom ASIC design. ADP3405 combines
the benefits of both worlds by providing an integrated standard
product solution where every block is optimized to operate in a
GSM environment while maintaining a cost-competitive solution.
Figure 2 shows the external circuitry associated with the ADP3405.
Only a few support components, mainly decoupling capacitors,
are required.
Input Voltage
The input voltage range for ADP3405 is 3 V to 7 V and optimized
for a single Li-Ion cell or three NiMH/NiCd cells. The thermal
impedance (
θ
JA
) of the ADP3405 is 62
°
C/W for 6-layer boards.
The charging voltage for a high capacity NiMH cell can be as high
as 5.5 V. Power dissipation should be calculated at maximum
ambient temperatures and battery voltage in order not to exceed
the 125
°
C maximum allowable junction temperature. Figure 3
shows the maximum total LDO output current as a function of
ambient temperature and battery voltage.
However, high battery voltages normally occur only when the
battery is being charged and the handset is not in conversation
mode. In this mode there is a relatively light load on the LDOs.
A fully charged Li-Ion battery is 4.25 V, where the LDOs deliver
the maximum 240 mA up to the max 85
°
C ambient temperature.
相關PDF資料 |
PDF描述 |
|---|---|
| ADP3408ARU-25 | GSM Power Management System |
| ADP3408 | Replaced by BQ29415 : Voltage Protection for 2, 3, or 4 Cell LiIon Batteries (2nd Lev Protection) 8-SM8 -25 to 85 |
| ADP3408ARU-18 | GSM Power Management System |
| ADP3410KRU | Dual MOSFET Driver with Bootstrapping |
| ADP3410 | Dual MOSFET Driver with Bootstrapping |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADP3405ARU | 制造商:AD 制造商全稱:Analog Devices 功能描述:GSM Power Management System |
| ADP3405ARU-REEL | 制造商:Analog Devices 功能描述:GSM Power Management System 28-Pin TSSOP T/R 制造商:Analog Devices 功能描述:GSM MGMT SYS LI-ION/NIMH 28TSSOP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:INTEGRATED CELLULAR POWER MGMT. SYSTEM - Tape and Reel |
| ADP3405ARU-REEL7 | 制造商:Analog Devices 功能描述:GSM Power Management System 28-Pin TSSOP T/R 制造商:Analog Devices 功能描述:GSM MGMT SYS LI-ION/NIMH 28TSSOP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:INTEGRATED CELLULAR POWER MGMT. SYSTEM - Tape and Reel |
| ADP3408 | 制造商:AD 制造商全稱:Analog Devices 功能描述:GSM Power Management System |
| ADP3408ACP-1.8-RL | 制造商:Analog Devices 功能描述:GSM Power Management System 32-Pin LFCSP EP T/R |
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