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PDF AT73C211 Data sheet ( Hoja de datos )
| Número de pieza | AT73C211 | |
| Descripción | Power Management | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• DC to DC Converter 1.9V / 2.5V (DCDC1)
• LDO Regulator 2.7V / 2.8V (LDO1)
• LDO Regulator 2.8V (LDO2)
• LDO Regulator 2.8V (LDO3)
• LDO Regulator 2.47V / 2.66 (LDO4) - Backup Battery Supply
• LDO Regulator 1.72V / 2.66 (LDO5) - RTC Supply
• Reset Generator
1. Description
The AT73C211 is a power management device for digital, analog, interface, and, in
some cases, RF and backup sections of add-on modules used as accessories in pop-
ular handheld devices like mobile phones, digital still cameras, PDAs and a wide
range of multimedia devices. The AT73C211 can also be used to supply the CPU with
a high-efficiency DC-DC Converter, a radio frequency transceiver with high power
supply rejection ratio (PSRR) and noise performance low-dropout (LDO) regulators, or
memories and analog sections with independent LDO channels.
In addition, the AT73C211 integrates LDO regulators to recharge backup elements
and convert its voltage to microcontroller RTC supply.
LDO regulators and DC-DC converters output voltage can be programmed by a mask
change.
Power
Management
AT73C211
6199A–PMGMT–20-Sep-05
1 page  
AT73C211
Figure 4-3 shows typical efficiency levels of the DC-to-DC converter for several input voltages.
Figure 4-3. DC-to-DC Converter with 1.9V Target Typical Case(1)
100
95
90
85
80
75
70
0
VIN=3.1V
VIN=3.6V
VIN=4.2V
50 100 150 200 250 300 350 400
Load Current (m A)
Note: 1. L = 10 µH, ESR = 0.2 Ohm, c = 22 µF, @ESR = 0.1 Ohm
4.2 LDO1, LDO3 Regulators
The PSRR measures the degree of immunity against voltage fluctuations achieved by a regu-
lator. An example of its importance is in the case of a GSM phone when the antenna switch
activates the RF power amplifier (PA). This causes a current peak of up to 2A on the battery,
with an important spike on the battery voltage. The voltage regulator must filter or attenuate
this spike.
6199A–PMGMT–20-Sep-05
5
5 Page 
5.5 LDO3 Regulator Electrical Characteristics
AT73C211
Table 5-7.
Symbol
VOUT
IOUT
IQC
∆VOUT
∆VPEAK
∆VOUT
∆VPEAK
PSRR
VN
TR
ISD
LDO3 Electrical Characteristics (tAMB = -20°C to 85°C, VIN = 3.2V to 4.2V unless otherwise specified)
Parameter
Conditions
Min Typ Max Unit
Output Voltage
2.8 V
Output Current
80 130 mA
Quiescent Current
195 µA
Line Regulation
Line Regulation Transient
Load Regulation
Load Regulation Transient
Ripple rejection
VIN: 3V to 3.4V, IOUT = 130 mA
Same as above, TR = TF = 5 µs
10% - 90% IOUT, VIN = 3V
Same as above, TR = TF = 5 µs
F = 217 Hz; VIN = 3.6V
70
1 2 mV
1.5 2.85 mV
3 mV
1.2 2.4 mV
73 dB
Output Noise
Rise Time
Shut Down Current
BW: 10 Hz to 100 kHz
100% IOUT, 10% - 90% VOUT
29 37 µVRMS
50 µs
1 µA
Table 5-8.
Symbol
COUT
CESR
LDO3 External Components
Parameter
Conditions
Output Capacitor Value
Output Capacitor ESR
100 kHz
Min Typ Max Unit
1.98 2.2 2.42 µF
50 mOhm
6199A–PMGMT–20-Sep-05
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AT73C211.PDF ] | |
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