Hi All,
I have same design constraints but did could not able to find adequate solution yet.Especially in the terms of cost. Please do not offer a component for $4. It is quite easy when we select a monolitic solution. Here is the constrains;
- Vin = 4,5V to 5,5V but can vary 3,5V to 8,5V. Also there will be short transients up to 15V (Even after protection, it is a little complex, please do not offer another kind of protection) Circuit have to work with 4V to 6V properly. There can be thermal shutdown or disable situations for excessive inputs.
- Vout = 5V with max. 10mV ripple.
- Load will be 50mA or (not to just or) 100mA.
- Input current should not be more than 150mA with 4.5V input
- There is a 22uH / 47uF LC filter on load input (can be usefull for ripple filtering, we can damp it for ~5KHz)
- Smallest footprint and PCB area without using BGA.
- Here is the main problem; A budget of ~$1.5 (max $2)
It is hard to find the price given in TI 1K volume budgetary price on distributors. (Why don't you check out the Digikey)
TPS63061 seems appropriate in first sight but has low efficiency in PWM mode for target load and high ripple in PFM mode. (see fig. 11&12 in DS)
2 stage solutions are also velcome. But not buck and boost. LDO and boost team is OK. To keep efficiency high, temperature low, we think to use 4.5V tiny LDO fallowed by 5V boost. But cost problem arised.It is hard to find 4.5V LDO, adjustables are big and expensive. 5V regulator with a diode on ouput is an option, but eff. ?
I hope experinced colleagues or TI experts offer a solution.
Regards.
