battery charger
1.5A USB-FRIENDLY Li-Ion BATTERY CHARGER AND POWER-PATH MANAGEMENT IC
- BQ24650-dat - BQ24650RVAR 丝印PAS VQFN-16 电池充电控制器芯片 - MPPT-dat == PAS TI71W
BQ24650 Stand-Alone Synchronous Buck Battery Charge Controller for Solar Power With Maximum Power Point Tracking
dq29330 + bq8030
The bq80xx family of devices are not sold to the mass market so there is no public information available.
LDO
LP2985
LP2985 150mA, Low-Noise, Low-Dropout Regulator With Shutdown
LP3853/LP3856 3A Fast Response Ultra Low Dropout Linear Regulators
FEATURES
- Ultra Low Dropout Voltage
- Stable with Selected Ceramic Capacitors
- Low Ground Pin Current
- Load Regulation of 0.08%
- 10nA Quiescent Current in Shutdown Mode
- Ensured Output Current of 3A DC
- Available in TO-263 and TO-220 Packages
- Output Voltage Accuracy ± 1.5%
- Error Flag Indicates Output Status
- Sense Option Improves Load Regulation
- Overtemperature/overcurrent Protection
- -40°℃ to +125°C Junction Temperature Range
info
PUCC33421QDHARQ1 == UCC33421-Q1 Ultra-Small, 1.5W, 5.0V, 5kVRMS Isolation, Automotive DC/DC Module
BQxx
- BQ24650-dat == Standalone 1-6 cell Buck battery charge controller with solar input and integrated MPPT
prebuild module
PTH04T231WAD - Non-Isolated DC/DC Converters 6A 2.2V-5.5Vin Non- Iso Adj Pwr Module
step-down
TLV62130RGTR - TLV62130x 3-V to 17-V 3-A Step-Down Converter In 3x3 QFN Package - Buck Switching Regulator IC Positive Adjustable 0.9V 1 Output 3A 16-VFQFN Exposed Pad
LDO
TPS74401-EP == 3.0-A ULTRA-LDO WITH PROGRAMMABLE SOFT-START
TPS7A89 == Small, Dual, 2-A, Low-Noise (3.8 μVRMS), LDO Voltage Regulator
TPS76350DBVR == 150-mA, 10-V, low-dropout voltage regulator with enable
TPS7A45xx Low-Noise Fast-Transient-Response 1.5-A Low-Dropout Voltage Regulators - TPS7A4501, TPS7A4515, TPS7A4518, TPS7A4525, TPS7A4533
LM78L - LM78L 100-mA Fixed Output Linear Regulator
LM3940 1-A Low-Dropout Regulator for 5-V to 3.3-V Conversion
The LM3940 is a 1-A low-dropout regulator designed to provide 3.3 V from a 5-V supply.
design
parallel
Two LDOs cannot simply be paralleled to get double the current unless they are specifically designed for current sharing.
Workaround - Add small ballast resistors (common workaround)
LDO1 ──0.1Ω──┐
├── Vout
LDO2 ──0.1Ω──┘
Resistors force current sharing
Typical values: 50–200 mΩ
Trade-offs:
- Voltage drop
- Worse load regulation
- Extra heat
⚠️ Still not ideal for high precision or high current
Better solutions (recommended)
Use one higher-current LDO
- Simplest
- Most reliable
Use a switching regulator + LDO
- Buck converter for current
- LDO for low noise
Use a regulator family designed for paralleling
- Some PMICs allow this
battery charger
