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Figure 6 shows typical efficiency levels of the DC-to-DC converter for several input
voltages.
Figure 6. DC-to-DC Converter with 1.9V Target Typical Case (1)
100
95
90
85
80
75
VIN=3.1V
VIN=3.6V
VIN=4.2V
70
0
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
LDO1, LDO3, LDO4,
LDO5
The PSRR measures the degree of immunization against voltage fluctuations achieved
by a regulator. 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 regula-
tor must filter or attenuate this spike.
Figure 7. Functional Diagram of LDO Single Mode
V BAT
V INT
ON
ON
IBIAS
V BG
ON
Pass
Device
V OUT
8
AT73C204
GND
GND
ON
Current
Sensing and
Limiter
GND
ON
V OUTS
R1
R2
GND
6014A–PMGMT–10/03
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