All Questions
15
questions
1
vote
0
answers
30
views
Auto power switching between USB and a range of Lipos (1S-3S)
I'm designing a circuit used in a portable device. I want the option of powering the device over USB or from a range of different Lipo batteries (1S-3S).
I want the circuit to auto negotiate between ...
- 11
1
vote
2
answers
174
views
Can I power a circuit from the balance cable of a lipo battery?
Hello I want to power a circuit (that runs at 3.3v) with the balancing cable of a 3s Lipo Battery, my plan is to use only 1 cell through an LDO to power my circuit.
My question is can I power it ...
- 13
2
votes
1
answer
172
views
Quiescent current in battery circuit
In this circuit I'm using an MCP73832 for battery charging and an AP2210 LDO. The mosfet is a DMP3099L. With the USB disconnected, VBAT set to 4.2V and the MCU (STM32F030F4P6) in standby mode (drawing ...
- 427
0
votes
0
answers
499
views
3.7 to 3.3V regulation
I want to power up my ESP32 with LiPo battery. LiPo Battery has voltage between 3.7 to 4.2V and ESP32's operating voltage range is 2.2 to 3.6V (but I want it to be 3.3V) and it consumes around 600mA.
...
- 17
0
votes
0
answers
130
views
Low power design - Adjust Vout of a adjustable LDO with feedback voltage from Lipo
TL;DR:
Using LDO to drop voltage from Lipo to stable 3V
LDO Vout can be adjusted with Voltage Divider
Lipo from 4.2V to 3.4V, Vout = 3V
Lipo below 3.4V, Vout = 2.3V
=> How to adjust Vout of LDO ...
- 1
0
votes
3
answers
798
views
Battery Protection IC (DW06D) burning LDO (MCP1700)
I badly need your help.
I have a PIR sensor setup. It works fine without the DW06D LiPo battery protection IC.
Yesterday I added the battery protection IC (instead of just bypassing it) since the ...
- 11
0
votes
1
answer
195
views
Problem using 5V LDO (AP7381) as power source for Arduino
Goal
I'm trying to build a portable speaker. I want to use an arduino to handle several tasks. The speaker uses a 6s Lipo ~24v as power source.
An LDO the AP7381 has been selected as power source for ...
- 1
0
votes
1
answer
225
views
LDO Voltage Regulator - What happens inside dropout range?
I’m using this 3.3V LDO (https://www.sparkfun.com/products/526) to power a device which normally takes 2 AAs (3V), using a 3.7V LiPo battery. The device won’t power on without the regulator (it can ...
- 397
1
vote
2
answers
570
views
Wiring two LDOs in parallel with only one diode between
i know the traditional wiring of two power sources with two diodes. But can it also work only with one?
Please take a look at the attached schematic:
The TPS706 pmos LDOs have build in reverse ...
- 23
0
votes
2
answers
311
views
Troubleshooting handsoldered TPS73633 SOT-23 LDO whose output is unexpectedly high
I have the following situation: I have a LiPo battery of 3.7V, 1200mAh. I want to use it to power a microcontroller that requires 3.3V.
To regulate the power, I want to use a TPS73633 LDO, in a 5-Pin ...
- 409
2
votes
1
answer
621
views
RTC power supply
The main task is to power STM32L476 RTC directly from li-po battery (3,7V-4,2V). Unfortunately I don't have enough space for supercap or extra battery. The RTC needs only about 450 nA and has quite ...
- 130
2
votes
2
answers
3k
views
LDO vs. Step-Down DCDC using LiPo
I know this question has been covered multiple times already; but as far as my reading goes I couldn't get any clear answers yet.
I am building a circuit based on a LiPo input source (4.2V to 3.3V) ...
- 67
0
votes
1
answer
887
views
Lithium polymer battery charger with LDO and AVR
I am planning to use this in my project.
The AVR microcontroller is asleep most of the time (less than 500 µA), and the current draw raises every minute up to 100 mA, but it lasts 500 ...
- 129
0
votes
2
answers
800
views
Power a 5.5 V/1.8 V microcontroller from a lithium polymer battery: 12 V + LDO = 3.3 V, or just pull from one cell?
I'm trying to power an ATtiny44 (1.8 V/5.5 V) from the balance port of an RC 2s/3s lithium polymer battery.
The circuit will use very little current, sleeping 29 secs/1 µA?, wake 1 ...
- 1
1
vote
2
answers
496
views
Combined chip with LDO and Buck, what use?
I am searching for a Li-polymer 1A charger with a 3V regulated output. I have found Linear LTC355x serie but can't, after reading many "LDO vs Switching" debates, understand the use of both on the ...
- 35