RICHTEK RT9177-24CB, RT9177-24CBR, RT9177-25CB, RT9177-25CBR, RT9177-26CB Datasheet

Preliminary

RT9177

Ultra-Low-Noise 200mA LDO Regulator

General Description

The RT9177 is a 200mA low dropout and low noise micro-power regulator suitable for portable RF applications. The output voltage accuracy is within

±2% and range from 2.4V to 3.2V in 100mV increments could be selected. It is designed for using very low ESR output capacitor. Its output remains stable even when using a 1 F ceramic as its output capacitor.

With an internal PMOS as the pass device, it does not need extra GND current in heavy load and dropout conditions. In shutdown mode, nearly zero operation current makes the IC suitable for batterypower devices. Other features including current limiting and over temperature protection. The noise performance can be improved by connecting a capacitor to the bypass pin.

Ordering Information

RT9177-

Package type

B : SOT-25 Type I

BR : SOT-25 Type II

Operating temperature range C : Commercial standard

Output voltage 24 : 2.4V

25 : 2.5V

:

:

31 : 3.1V

32 : 3.2V

Features

zUltra-Low-Noise (150nV/ Hz ) for RF Application

z1 F Ceramic COUT Stable

zLow Dropout Voltage (220mV @ 200mA)

zLow Operation Current - 80 A Typical

zShutdown Function

zLow Temperature Coefficient

zCurrent and Thermal Limiting

zCustomized Voltage Available

zSOT-25 Package

Applications

zCellular Phones

zLaptop, Notebook, and Palmtop Computers

zBattery-powered Equipment

zHand-held Equipment

Pin Configurations

Part Number		Pin Configurations
RT9177CB											TOP VIEW
			5						4		1.	IN
(Plastic SOT-25)
											2.	GND
											3.	SHDN
											4.	BP
			1			2			3
											5.	OUT
RT9177CBR											TOP VIEW
											1.	OUT
(Plastic SOT-25)				5					4
											2.	GND
											3.	IN
											4.	SHDN
				1			2		3
											5.	BP

Typical Application Circuit

VIN

RT9177

VOUT

IN OUT

CIN

GND

COUT

1µF

1µF

ON

OFF

SHDN BP

CBP

10nF

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RT9177

Preliminary

Marking Information

Part Number	Marking
RT9177-24CB	H9
RT9177-25CB	HA
RT9177-26CB	HB
RT9177-27CB	HC
RT9177-28CB	HD
RT9177-29CB	HE
RT9177-30CB	HF
RT9177-31CB	HG
RT9177-32CB	HH

Part Number	Marking
RT9177-24CBR	P9
RT9177-25CBR	PA
RT9177-26CBR	PB
RT9177-27CBR	PC
RT9177-28CBR	PD
RT9177-29CBR	PE
RT9177-30CBR	PF
RT9177-31CBR	PG
RT9177-32CBR	PH

Pin Description

Pin Name	Pin Function
IN	Input
GND	Ground
SHDN	Active Low Shutdown Input
BP	Reference Noise Bypass
OUT	Output

Function Block Diagram

SHDN	Shutdown
		and
	Logic Control
BP	VREF
	+	MOS Driver
	_
	Error Amp
		Current-Limit
		and
		Thermal
		Protection

IN

OUT

GND

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Preliminary

RT9177

Absolute Maximum Ratings

zInput Voltage 7V

zPower Dissipation, PD @ TA = 25°C

SOT-25 0.25W

z Operating Junction Temperature Range

−40°C to 125°C

zStorage Temperature Range −65°C to 150°C

zPackage Thermal Resistance

SOT-25, θJA	250°C/W
z Lead Temperature (Soldering, 5 sec.)	260°C

Electrical Characteristics

(VIN = 5.0V, CIN = 1µF, COUT = 1µF, TA = 25°C, unless otherwise specified)

	Parameter	Symbol	Test Conditions	Min	Typ	Max	Units
	Input Voltage Range	VIN		2.5	--	6	V
	Output Voltage Accuracy	∆VOUT	IL = 1mA	-2	--	+2	%
	Maximum Output Current	IMAX		200	--	--	mA
	Current Limit	ILIMIT	RLOAD = 1Ω	--	300	--	mA
	GND Pin Current	IG	No Load	--	80	150	µA
			IOUT = 200mA	--	90	150
	Dropout Voltage (Note)		IOUT = 1mA	--	1.1	5
		VDROP	IOUT = 50mA	--	55	100	mV
	(VOUT(Nominal)≥3.0V Version)
			IOUT = 200mA	--	220	300
	Line Regulation	∆VLINE	VIN = (VOUT+0.15) to 6V, IOUT = 1mA	-0.2	--	+0.2	%/V
	Load Regulation	∆VLOAD	IOUT = 0mA to 200mA	--	0.01	0.04	%/mA
	SHDN Input High Threshold	VIH	VIN = 3V to 5.5V	1.0	--	--	V
	SHDN Input Low Threshold	VIL	VIN = 3V to 5.5V	--	--	0.4	V
	SHDN Bias Current	ISD		--	--	100	nA
	Shutdown Supply Current	IGSD	VOUT = 0V	--	0.01	1	µA
	Thermal Shutdown Temperature	TSD		--	150	--	°C
	Output Noise	eNO	CBP = 10nF, COUT = 10µF	--	150	--	nV/ Hz
	Ripple Rejection	PSRR	F = 100Hz, CBP = 10nF, COUT = 10µF	--	68	--	dB

Notes: Dropout voltage definition: VIN - VOUT when VOUT is 50 mV below the value of VOUT at VIN = VOUT + 0.5V

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RT9177

Preliminary

Typical Operating Characteristics

GND Current vs. Load

	75
	74
	73
	72
(uA)	71
	70
G
I	69
	68
	67
	66				TA = 25°C
	65
	0	50	100	150	200	250

IOUT (mA)

Output Voltage Variation vs. Load

	0.2				TA = 25°C
	0.1
	0.0
(%)	-0.1
OUT	-0.2
∆V
	-0.3
	-0.4
	-0.5
	0	50	100	150	200	250

IOUT (mA)

	3.10		VOUT vs. VIN
	3.00
	2.90
(V)	2.80
OUT
	20mA
V	50mA
	2.70
	100mA
	2.60	200mA			VOUT = 3V
					TA = 25°C
	2.50
	2.5	3.0	3.5	4.0	4.5	5.0

VIN (V)

Output Voltage Variation vs. Temperature

	1.00
	0.75
	0.50
(%)	0.25
	0.00					No Load
OUT
∆V	-0.25
	-0.50
	-0.75
	-1.00
	-40	-10	20	50	80	110	140
			Temperature (°C)

Dropout Voltage vs. Output Current

	250
							80°C
(mV)	200
							25°C
Voltage	150
Dropout	100
	50
	0					VOUT = 3V
	20	50	80	110	140	170	200

Output Current (mA)

GND Current vs. Temperature

	71
	70
	69
(uA)	68
	67
G
I
	66
	65
	64
	63
	-40	-10	20	50	80	110	140

Temperature °( C)

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