Product Info

24
LiPo Battery (3.2 ~ 4.35 V)
The battery can supply the entire system (ALT1250 + FEM), without additional external power conditioning
circuits.
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CR17450 Battery (2.2 ~ 3.0 V)
The ALT1250 can be fully functional without additional external power conditioning circuits. However, the
FEM requires a higher voltage supply, so an external boost circuit is required to supply VBAT_FEM.
Boost converter such as TPS61021A may be turned on/off by the DCDC enable signal,
AUX_ADC4 (pin 33, active high).
AA Lithium Battery (1.0 ~ 1.5 V)
For battery range of 1.0 – 1.5 V, both ALT1250 and FEM require an additional boost circuit.
VBAT: ultra low I
Q
synchronous boost converter such as TPS61098x may be used
VBAT_FEM: boost converter such as TPS61021A may be turned on/off by the DCDC enable
signal, AUX_ADC4 (pin 33, active high).
3.4 PMU
ALT1250 includes integrated PMU which supplies current for all ALT1250 blocks, IOs, Flash, TCXO and
UICC.
Signal Functionality Input/
Output
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Polarity
PMU_SHUTDOWN HW Reset Input Active Low
PMU_POWER_BUTTON Reserved Input Active High
PMU_WAKEUP Wakeup Input Active High
Table 7 PMU system signals