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TPS7A20: high PSRR device

Henry Wang3

Genius 3025 points

Part Number: TPS7A20
Other Parts Discussed in Thread: TPS7A94

Hi Sir,

My customer is looking for a LDO device better than ADI ADP122, they will use it to apply power on the image sensor and need high PSRR.

Please let me know if you have any suggestions.

Vout = 2.8V, Iout = 100mA, PSRR (Freq at 10k~100KHz) up to -70dB.

ADP122 PSRR figure:

over 2 years ago

0 Prakash Lakhit over 2 years ago

TI__Expert 5046 points

Henry,

TPS7A2028PDBVR or TPS7A2028PDQNR are good replacements for ADP122. We also plan to release TPS7A94 this year which has much higher PSRR.

https://www.ti.com/product/TPS7A94

	ADP122	TPS7A20
AEC Q100	NO	NO
Output Options	Fixed Output	Fixed Output
Iout (Max) (A)	0.3	0.3
Vin (Max) (V)	5.5	6
Vin (Min) (V)	2.3	1.6
Vout (Max) (V)	3.3	5.5
Vout (Min) (V)	1.75	0.8
Fixed Output Options (V)	1.8, 2, 2.5, 2.6, 2.7, 2.8, 2.85, 2.9, 3, 3.3	1.2, 1.5, 1.8, 1.825, 1.85, 2.4, 2.5, 2.8, 3, 3.3, 4.5, 5
Enable	YES	YES
Power Good	NO	NO
Output Capacitor Type	Ceramic	Ceramic
PSRR @ 100KHz (dB)	60	60
Noise (uVrms)	25	7
Accuracy (%)	2	1.5
Vdo (Typ) (mV)	85	140
Iq (Typ) (mA)	0.045	0.0065
Thermal Resistance θJA (°C/W)	68.9	179.1
Min Package Area (mm2)	4	1
Package Type	SOT-23, SON	SOT-23, X2SON

Thanks,

Prakash L

0 Henry Wang3 over 2 years ago in reply to Prakash Lakhit

Genius 3025 points

Hi Sir,

Thank you for your sharing.

BTW, most camera modules don't have enough PCB space, if TPS7A94 has the fixed output solution it's better.

+1 Prakash Lakhit over 2 years ago in reply to Henry Wang3

TI__Expert 5046 points

Henry,

If that's the case. TPS7A20 would be the best option.

Thanks,

Prakash L