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ADP3404 Datasheet(PDF) 9 Page - Analog Devices |
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ADP3404 Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page ADP3404 –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 ADP3404 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 CAPACITOR- TYPE 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 0 10 100k 100 1k 10k 400 300 200 100 FULL LOAD MLCC CAPS VCCA TCXO REF TPC 13. Output Noise Density 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 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 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 JA) of the ADP3404 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 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 °C ambient temperature. |
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