TEXAS INSTRUMENTS TPS79401, TPS79418, TPS79425, TPS79428, TPS79430 Technical data

TPS79401

TPS79401, TPS79418

TPS79425, TPS79428

TPS79430, TPS79433

www.ti.com	SLVS349D –NOVEMBER 2001 –REVISED OCTOBER 2004

ULTRALOW-NOISE, HIGH PSRR, FAST RF 250-mA LOW-DROPOUT LINEAR REGULATORS

FEATURES

∙250-mA Low-Dropout Regulator With Enable

∙Available in 1.8 V, 2.5 V, 2.8 V, 3 V, 3.3 V, and Adjustable (1.2 V to 5.5 V)

∙High PSRR (60 dB at 10 kHz)

∙Ultralow Noise (32 µVrms, TPS79428)

∙Fast Start-Up Time (50 µs)

∙Stable With a 2.2-µF Ceramic Capacitor

∙Excellent Load/Line Transient Response

∙Very Low Dropout Voltage (155 mV at Full Load)

∙Available in MSOP-8 and SOT223-6 Packages

APPLICATIONS

∙RF: VCOs, Receivers, ADCs

∙Audio

∙ Bluetooth™, Wireless LAN

∙Cellular and Cordless Telephones

∙Handheld Organizers, PDAs

DESCRIPTION

The TPS794xx family of low-dropout (LDO) linear voltage regulators features high power-supply rejection ratio (PSRR), ultralow-noise, fast start-up, and excellent line and load transient responses in small outline, MSOP-8 PowerPAD™ and SOT223-6 packages. Each device in the family is stable with a small 2.2-µF ceramic capacitor on the output. The family uses an advanced, proprietary BiCMOS fabrication process to yield extremely low dropout voltages (e.g., 155 mV at 250 mA). Each device achieves fast start-up times (approximately 50 µs with a 0.001-µF bypass capacitor) while consuming low quiescent current (170 µA typical). Moreover, when the device is placed in standby mode, the supply current is reduced to less than 1 µA. The TPS79428 exhibits approximately 32 µVRMS of output voltage noise at 2.8 V output with a 0.1-µF bypass capacitor. Applications with analog components that are noise-sensitive, such as portable RF electronics, benefit from the high PSRR and low noise features as well as the fast response time.

DGN PACKAGE

MSOP PowerPAD	TPS79433	TPS79428
(TOP VIEW)	RIPPLE REJECTION	OUTPUT SPECTRAL NOISE DENSITY

OUT	1	8	IN				vs
						FREQUENCY
NC	2	7	NC
				90							0.35
FB	3	6	EN							√Hz)
NR	4	5	GND	80		IOUT = 10 mA					0.30
										(μV/
NC − No internal connection				70				IOUT = 250 mA
			Rejection (dB)							Noise Density	0.25
				60
	DCQ PACKAGE			50							0.20
	SOT223-6
	(TOP VIEW)			40							0.15
			Ripple							Spectral
EN	1			30	VIN = 4.3 V,						0.10
	2			20	VOUT = 3.3 V,
IN			6		CIN = 1 μF,					Output
GND	3										0.05
						μ
			GND	10	COUT = 10 F,
OUT	4				CNR = 0.01 μF						0
				0
NR	5			10	100	1 k	10 k	100 k	1 M	10 M

Frequency (Hz)

		vs
	FREQUENCY
		COUT = 2.2 μF,
		CNR = 0.1 μF,
		VIN = 3.8 V
	IOUT = 250 mA
		IOUT = 1 mA
100	1000	10000	100000

Frequency (Hz)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Bluetooth is a trademark of Bluetooth SIG, Inc. PowerPAD is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.	Copyright © 2001–2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.

	TPS79401, TPS79418
	TPS79425, TPS79428
	TPS79430, TPS79433	www.ti.com
	SLVS349D –NOVEMBER 2001 –REVISED OCTOBER 2004

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

ORDERING INFORMATION

PRODUCT	VOLTAGE	PACKAGE	TJ	SYMBOL	PART NUMBER	TRANSPORT MEDIA,
						QUANTITY
		MSOP-8		AXL	TPS79401DGNR	Tape and Reel, 2500
					TPS79401DGNT	Tape and Reel, 250
TPS79401	Adjustable
					TPS79401DCQR	Tape and Reel, 2500
		SOT223-6		PS79401
					TPS79401DCQ	Tube, 78
		MSOP-8		AXM	TPS79418DGNR	Tape and Reel, 2500
					TPS79418DGNT	Tape and Reel, 250
TPS79418	1.8 V
					TPS79418DCQR	Tape and Reel, 2500
		SOT223-6		PS79418
					TPS79418DCQ	Tube, 78
		MSOP-8		AYB	TPS79425DGNR	Tape and Reel, 2500
					TPS79425DGNT	Tape and Reel, 250
TPS79423	2.5 V
					TPS79425DCQR	Tape and Reel, 2500
		SOT223-6		PS79425
					TPS79425DCQ	Tube, 78
			-40°C to 125°C
					TPS79428DGNR	Tape and Reel, 2500
		MSOP-8		AYC
					TPS79428DGNT	Tape and Reel, 250
TPS79428	2.8 V
					TPS79428DCQR	Tape and Reel, 2500
		SOT223-6		PS79428
					TPS79428DCQ	Tube, 78
		MSOP-8		AYD	TPS79430DGNR	Tape and Reel, 2500
					TPS79430DGNT	Tape and Reel, 250
TPS79430	3 V
					TPS79430DCQR	Tape and Reel, 2500
		SOT223-6		PS79430
					TPS79430DCQ	Tube, 78
		MSOP-8		AYE	TPS79433DGNR	Tape and Reel, 2500
					TPS79433DGNT	Tape and Reel, 250
TPS79433	3.3 V
					TPS79433DCQR	Tape and Reel, 2500
		SOT223-6		PS79433
					TPS79433DCQ	Tube, 78

2

		TPS79401, TPS79418
		TPS79425, TPS79428
	www.ti.com	TPS79430, TPS79433
		SLVS349D –NOVEMBER 2001 –REVISED OCTOBER 2004
	ABSOLUTE MAXIMUM RATINGS
	over operating temperature range unless otherwise noted(1)
		VALUE
	VIN range	-0.3 V to 6 V
	VEN range	-0.3 V to VIN + 0.3 V
	VOUT range	-0.3 V to 6 V
	Peak output current	Internally limited
	ESD rating, HBM	2 kV
	ESD rating, CDM	500 V
	Continuous total power dissipation	See Dissipation Ratings Table
	Junction temperature range, TJ	-40°C to 150°C
	Storage temperature range, Tstg	-65°C to 150°C

(1)Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

PACKAGE DISSIPATION RATINGS

PACKAGE	AIR FLOW	RθJC(°C/W) RθJA(°C/W)		TA ≤ 25°C	TA = 70°C	TA = 85°C
	(CFM)			POWER RATING	POWER RATING	POWER RATING
	0	8.47	55.09	2.27 W	1.45 W	1.18 W
DGN	150	8.21	49.97	2.50 W	1.60 W	1.30 W
	250	8.20	48.10	2.60 W	1.66 W	1.35 W

PD (W)

6
5
4
		Condition 1										CONDITIONS	PACKAGE	PCB AREA	θJA
3												1	SOT223	4in2 Top Side Only	53°C/W
			Condition 2
2												2	SOT223	0.5in2 Top Side Only	110°C/W
1
0
0		25	50	75		100		125		150
				TA (°C)

Figure 1. SOT223 Power Dissipation

3

	TPS79401, TPS79418
	TPS79425, TPS79428
	TPS79430, TPS79433	www.ti.com
	SLVS349D –NOVEMBER 2001 –REVISED OCTOBER 2004

ELECTRICAL CHARACTERISTICS

Over recommended operating temperature range (TJ = -40°C to 125°C), VEN = VIN, VIN = VOUT(nom) + 1 V(1), IOUT = 1mA, COUT = 10µF, CNR = 0.01 µF, unless otherwise noted. Typical values are at 25°C.

	PARAMETER		TEST CONDITIONS			MIN	TYP	MAX	UNIT
V	Input voltage(1)					2.7		5.5	V
IN
IOUT	Continuous output current					0		250	mA
VFB	Internal reference	TPS79401 TJ = 25°C				1.220	1.225	1.230	V
VOUT	Output voltage range	TPS79401				VFB		5.5 - VDO	V
	Accuracy(1)	V	+ 1 V ≤ V ≤ 5.5 V 0 mA ≤ I	OUT	≤ 250 mA	-3.0		+3.0	%
		OUT	IN

Output voltage line regulation ( VOUT%/ VIN)(1)

Load regulation ( VOUT%/ IOUT) TPS79428

Dropout voltage(2)

TPS79430

VIN = VOUT(nom) - 0.1 V

TPS79433

Output current limit

Ground pin current

Shutdown current(3)

FB pin current

Power-supply ripple

TPS79428

rejection

Output noise voltage (TPS79428)

Time, start-up (TPS79428)

High-level enable input voltage

Low-level enable input voltage EN pin current

UVLO threshold

UVLO hysteresis

VOUT + 1 V < VIN ≤ 5.5 V		0.05	0.12	%/V
0 µA < IOUT < 250 mA		10		mV
IOUT = 250 mA		155	210
IOUT = 250 mA		155	210	mV
IOUT = 250 mA		145	200
VOUT = 0 V		925		mA
0 µA < IOUT < 250 mA		170	220	µA
VEN = 0 V	2.7 V < VIN < 5.5 V	0.07	1	µA
VFB = 1.8 V			1	µA
f = 100 Hz	IOUT = 250 mA	65
f = 10 kHz	IOUT = 250 mA	60		dB
f = 100 kHz	IOUT = 250 mA	40
	CNR = 0.001 µF	55
BW = 100 Hz to 100	CNR = 0.0047 µF	36		µVRMS
kHz, IOUT = 250 mA	C = 0.01 µF	33
	NR
	CNR = 0.1 µF	32
	CNR = 0.001 µF	50
RL - 14 Ω, COUT = 1 µF	CNR = 0.0047 µF	70		µs
	CNR = 0.01 µF	100
2.7 V < VIN < 5.5 V		1.7	VIN	V
2.7 V < VIN < 5.5 V		0	0.7	V
VEN = 0		1	1	µA
VCC rising		2.25	2.65	V
		100		mV

(1)Minimum VIN is 2.7 V or VOUT + VDO, whichever is greater.

(2)Dropout is not measured for the TPS79418 and TPS79425 since minimum VIN = 2.7 V.

(3)For adjustable versions, this applies only after VIN is applied; then VEN transitions high to low.

4

TPS79401, TPS79418

TPS79425, TPS79428

TPS79430, TPS79433

www.ti.com

SLVS349D –NOVEMBER 2001 –REVISED OCTOBER 2004

FUNCTIONAL BLOCK DIAGRAM—ADJUSTABLE VERSION

IN			OUT
	UVLO	Current
		Sense
		ILIM	SHUTDOWN
			R1
GND		_
			+
			FB
EN		UVLO
			R2
	Thermal
Shutdown		Quickstart	External to
	Bandgap	250 kΩ	the Device
			Vref
VIN	Reference
	1.225 V		NR(1)

(1) Not Available on DCQ (SOT223) options.

FUNCTIONAL BLOCK DIAGRAM—FIXED VERSION

IN					OUT
	UVLO	Current
		Sense
GND		ILIM		SHUTDOWN	R1
			_	+
EN
		UVLO
Thermal					R2
Shutdown
		Quickstart			R2 = 40k
	Bandgap
		250 kΩ		Vref
VIN	Reference				NR
	1.225 V

Terminal Functions

TERMINAL

NAME

DGN DCQ (MSOP) (SOT223)

NR

4

5

DESCRIPTION

Connecting an external capacitor to this pin bypasses noise generated by the internal bandgap. This improves power-supply rejection and reduces output noise.

EN	6	1	The EN terminal is an input which enables or shuts down the device. When EN goes to a logic high, the
			device will be enabled. When the device goes to a logic low, the device is in shutdown mode.
FB	3	5	This terminal is the feedback input voltage for the adjustable device.
GND	5, PAD	3	Regulator ground.
IN	8	2	Unregulated input to the device.
NC	2, 7		No internal connection.
OUT	1	4	Output of the regulator.

5