参数资料
型号: AS3658-BCTP
厂商: ams
文件页数: 81/158页
文件大小: 0K
描述: IC PMU POWER/AUDIO 124-CTBGA
标准包装: 2,500
应用: 便携式设备
电流 - 电源: 7mA
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 124-TFBGA
供应商设备封装: 124-CTBGA(8x8)
包装: 带卷 (TR)
AS3658
Data Sheet Confidential
- Detailed Description-Power Management Functions
Table 79. LDOs Reg Power2ctrl Bit definitions
Addr:30
Reg Power2 Ctrl
These bits control the on/off function of the ldo regulator
Bit
Bit Name
Default Access
Description
0
ldo_rf3_on
ROM
R/W
Switch on control of RF3 LDO; Important: Set rf3_sw=0
before setting ldo_rf3_on=1
Switch on control of DIG3 LDO; it is possible to on/off
1
ldo_dig3_on
ROM
R/W
control LDO DIG_3 by CURR3_GPIO3 or CURR4_GPIO4
2
3
4
7
ldo_dig4_on
rf1_sw
rf2_sw
rf3_sw
ROM
ROM
ROM
ROM
R/W
R/W
R/W
R/W
Switch on control of DIG4 LDO
If ‘1’ RF1-LDO is operating as High side switch (Ron=1 Ω ),
valid if ldo_rf1_on=0
If ‘1’ RF2-LDO is operating as High side switch (Ron=1 Ω ),
valid if ldo_rf2_on=0
If ‘1’ RF3-LDO is operating as High side switch (Ron=1 Ω ),
valid if ldo_rf3_on=0
8.12.1 RF LDO’s (VRF_1, VRF_2, VRF_3)
These LDO’s are designed to supply sensitive analogue circuits like LNA’s, Transceivers, VCO’s and other critical RF
components of cellular radios. Another application is the supply of audio devices or as a reference for AD and DA
converters. The design is optimized to deliver the best compromise between quiescent current and regulator
performance for battery powered devices.
Stability is guaranteed with ceramic output capacitors of 1μF ±20% (X5R) or 2.2μF +100/-50% (Z5U) for RF2 , RF3 and
2.2μF ±20% (X5R) or 4.7μF +100/-50% (Z5U) for RF1. The low ESR of these caps ensures low output impedance at
high frequencies. Regulation performance is excellent even under low dropout conditions, when the power transistor
has to operate in linear mode. Power supply rejection is high enough to suppress the PA-ripple on the battery in TDMA
systems at the output. The low noise performance allows direct connection of noise sensitive circuits without additional
filtering networks. The low impedance of the power device enables the device to deliver up to I OUT current even at
nearly discharged batteries without any decrease of performance.
With vrf2_lcurr_en=0 and vrf3_lcurr_en=0 the regulator VRF_2, VRF_3 can deliver up to 250mA
With vrf1_lcurr_en=0 the regulator VRF_1 can deliver up to 400mA
www.austriamicrosystems.com
Revision 1v13
80 - 157
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