TPS737 datasheet(18/50 Pages) TI2

18 / 50 page

VOUT

1.2 V

1.5 V

1.8 V

2.5 V

2.8 V

3.0 V

3.3 V

Short

23.2 kW

28.0 kW

39.2 kW

44.2 kW

46.4 kW

52.3 kW

Open

95.3 kW

56.2 kW

36.5 kW

33.2 kW

30.9 kW

30.1 kW

NOTE: VOUT = (R1 + R2)/R2 ´ 1.204;

R1 || R2 @ 19 kW for best

accuracy.

Servo

Error

Amp

Ref

Current

Limit

Thermal

Protection

Bandgap

OUT

GND

80 kW

8 k W

27 kW

4-MHZ

Charge Pump

Standard 1% Resistor Values

for Common Output Voltages

Figure 6-2. Adjustable-Voltage Version

6.3 Feature Description

6.3.1 Output Noise

A precision band-gap reference is used to generate the internal reference voltage, Vref. This reference is the

dominant noise source within the TPS737xx and generates approximately 32 μVRMS (10 Hz to 100 kHz) at

the reference output (NR). The regulator control loop gains up the reference noise with the same gain as the

reference voltage, so that the noise voltage of the regulator is approximately given by:

OUT

RMS

REF

R )

32 V

(1)

Because the value of VR is 1.2 V, this relationship reduces to the following equation for the case of no CNR.

RMS

OUT

V ( V

)

(V)

(2)

An internal 27-kΩ resistor in series with the noise-reduction pin (NR) forms a low-pass filter for the voltage

reference when an external noise-reduction capacitor, CNR, is connected from NR to ground. For CNR = 10

nF, the total noise in the 10-Hz to 100-kHz bandwidth is reduced by a factor of approximately 3.2, giving the

approximate relationship in the following equation for CNR = 10 nF.

RMS

)=8.5

(V)

x V

OUT

()

mVRMS

(3)

This noise reduction effect is shown as RMS Noise Voltage vs CNR in the Typical Characteristics section.

The TPS73701 adjustable version does not have the NR pin available. However, connecting a feedback

capacitor, CFB, from the output to the feedback pin (FB) reduces output noise and improves load transient

performance. Limit this capacitor to 0.1 µF.

TPS737

SBVS067W – JANUARY 2006 – REVISED AUGUST 2025

www.ti.com

Submit Document Feedback

Product Folder Links: TPS737

TPS737 Datasheet(PDF) 18 Page - Texas Instruments

TPS737 Datasheet(HTML) 18 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

Datasheet Download

Link URL