ADP3404ARU-REEL Analog Devices Inc, ADP3404ARU-REEL Datasheet - Page 9

• Manufacturer Part Number: ADP3404ARU-REEL
• Manufacturer: Analog Devices Inc

Specifications of ADP3404ARU-REEL

• Battery Type: Li-Ion/NiMH
• Output Current: 175uA
• Output Voltage: 2.45V
• Operating Temp Range: -20C to 85C
• Package Type: TSSOP
• Mounting: Surface Mount
• Pin Count: 28
• Operating Temperature Classification: Commercial
• Lead Free Status / Rohs Status: Not Compliant

THEORY OF OPERATION
The ADP3404 is a power management chip optimized for use
with GSM baseband chipsets in handset applications. Figure 1
shows a block diagram of the ADP3404.
The ADP3404 contains several blocks:
• Four Low Dropout Regulators (Digital, Analog, Crystal
• Reset Generator
• Buffered Precision Reference
• SIM Interface Logic Level Translation (3 V/5 V)
• SIM Voltage Supply
• Power On/Off Logic
• Undervoltage Lockout
Oscillator, Real-Time Clock)
600
500
400
300
200
100
0
10
TCXO
REF
VCCA
100
1 LI-ION
CHARGER
3 NIMH
INPUT
OR
FREQUENCY – Hz
DIGITAL AND
SIM GND
ANALOG GND
1k
10 F
100nF
PROCESSOR
10k
0.22 F
100nF
2.2 F
GSM
FULL LOAD
MLCC CAPS
R1
2.2 F
10
R2
100k
10
11
12
13
14
1
2
3
4
5
6
7
8
9
RESCAP
DGND
RESET
REFOUT
ANALOGON
VTCXO
VCCA
AGND
VBAT
VCC
PWRONKEY
PWRONIN
ROWX
CHRON
ADP3404
TSSOP-28
These functions have traditionally been done either as a discrete
implementation or as a custom ASIC design. ADP3404 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 ADP3404.
Only a few support components, mainly decoupling capacitors,
are required.
Input Voltage
The input voltage range for ADP3404 is 3 V to 7 V and optimized
for a single Li-Ion cell or three NiMH/NiCd cells. The thermal
impedance (θ
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
maximum allowable junction temperature. Figure 3 shows the maxi-
mum 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
SIMPROG
RESETIN
SIMGND
DATAIO
SIMBAT
SIMON
CLKIN
CAP+
CAP–
VRTC
VSIM
CLK
RST
I/O
JA
28
27
26
25
24
23
22
21
20
19
18
17
16
15
) of the ADP3404 is 62
10 F
100nF
10 F
100nF
GSM PROCESSOR
RST TO SIM CARD
I/O TO SIM CARD
CLK TO SIM CARD
PROCESSOR
SIM PINS
GSM
OF
CAPACITOR-
TYPE BACK-UP
COIN CELL
°
C/W for 6-layer boards.
°
C ambient temperature.
ADP3404
°
C