TPS7B87-Q1: Whether 4 pin and 5 pin are connected?

Rhea Gao

Part Number: TPS7B87-Q1
Other Parts Discussed in Thread: TPS7B4253-Q1, TPS7B4254-Q1

Hi，

The sample of TPS7B8750QDDARQ1 I purchased found that pin 4 and pin 5 were connected together, is this correct?

And the manual is NC, I before the fourth pin is the feedback function.

In addition, I used TPS7B4253QDDARQ1 before, because the supply is in short supply, please help to recommend suitable P2P replacement products, many thanks~

over 2 years ago

0 Nick Butts over 2 years ago

TI__Mastermind 45845 points

Hi Rhea,

I am looking into the TPS7B87-Q1 pins 4/5 question and I'll get back to you in 1-2 business days.

I am contacting a colleague for help with a P2P recommendation.

Regards,

NIck

0 Andres Sagredo over 2 years ago

TI__Expert 4930 points

Hi Rhea,

Since TPS7B4253QDDARQ1 is a tracking LDO there is one other option which is P2P, which has half the max output current: TPS7B4254QDDARQ1

	TPS7B4253QDDARQ1	TPS7B4254QDDARQ1
Generic Part Number	TPS7B4253-Q1	TPS7B4254-Q1
Iout(Max)(A)	0.3	0.15
Vin(Max)(V)	40	40
Vin(Min)(V)	4	4
Vout(Max)(V)	40	40
Vout(Min)(V)	1.5	2
Fixed Voltage(V)	Special	Special
PSRR @ 100 KHz(dB)	43	43
Noise(uVrms)	---	---
Accuracy(%)	---	---
Dropout voltage (Vdo)(Typ)(mV)	350	160
Iq(Typ) (mA)	0.04	0.06
Output capacitor type	Ceramic, Non-Ceramic	Ceramic, Non-Ceramic
Thermal resistance θJA(°C/W)	45	45
Operating temperature range(C)	-40 to 125	-40 to 125
Package size: mm2	42 mm2: 6.4 x 6.5 (HTSSOP\|20), 19 mm2: 3.9 x 4.89 (SO PowerPAD\|8)	19 mm2: 3.9 x 4.89 (SO PowerPAD\|8)
Package	SO PowerPAD\|8	SO PowerPAD\|8
Pin 1	OUT	OUT
Pin 2	NC	NC
Pin 3	GND	GND
Pin 4	FB	FB
Pin 5	REF	REF
Pin 6	GND	GND
Pin 7	NC	NC
Pin 8	IN	IN

Regards,

Andres

0 Rhea Gao over 2 years ago in reply to Nick Butts

Expert 2300 points

Hi Nick,

We have found the cause of the problem. Thank you very much for your support!

0 Rhea Gao over 2 years ago in reply to Andres Sagredo

Expert 2300 points

Hi Andres,

OK, Many thanks~

0 Nick Butts over 2 years ago in reply to Rhea Gao

TI__Mastermind 45845 points

Hi Rhea,

Great! I'll close this post then.

Regards,

Nick

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TPS7B87-Q1: Whether 4 pin and 5 pin are connected?