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 1µF 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 battery-

power 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

:

Features

z

Ultra-Low-Noise (150nV/

z

1µµµµF Ceramic C

Low Dropout Voltage (220mV @ 200mA)

z

Low Operation Current - 80µµµµA Typical

z

Shutdown Function

z

Low Temperature Coefficient

z

Current and Thermal Limiting

z

Customized Voltage Available

z

SOT-25 Package

z

OUT

Stable

) for RF Application

Hz

Applications

z Cellular Phones

z Laptop, Notebook, and Palmtop Computers

z Battery-powered Equipment

z Hand-held Equipment

Pin Configurations

Part Number Pin Configurations

321

TOP VIEW

1. IN

2. GND

3. SHDN

4. BP

5. OUT

TOP VIEW

1. OUT

2. GND

3. IN

4. SHDN

5. BP

RT9177-CB

(Plastic SOT-25)

RT9177-CBR

(Plastic SOT-25)

54

321

54

31 : 3.1V

32 : 3.2V

DS9177-02 June 2001 www.richtek-ic.com.tw

Typical Application Circuit

RT9177

V

IN

ON

OFF

C

IN

1µF

IN

OUT

GND

SHDN BP

C 1µF

C

10nF

OUT

BP

V

OU T

1

RT9177

Marking Information

Preliminary

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

Pin Description

Pin Name Pin Function

IN Input

GND Ground

SHDN Active Low Shutdown Input

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

BP Reference Noise Bypass

OUT Output

Function Block Diagram

SHDN

BP

VREF

Shutdown

Logic Control

+

_

Error Amp

and

MOS Driver

IN

OUT

Current-Limit

and

Thermal

Protection

GND

www.richtek-ic.com.tw DS9177-02 June 2001

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Absolute Maximum Ratings

Preliminary

RT9177

Input Voltage

z

Power Dissipation, PD @ TA = 25°C

z

7V

SOT-25 0.25W

Operating Junction Temperature Range −40°C to 125°C

z

Storage Temperature Range −65°C to 150°C

z

Package Thermal Resistance

z

SOT-25, θ

Lead Temperature (Soldering, 5 sec.) 260°C

z

JA

250°C/W

Electrical Characteristics

(V

= 5.0V, C

IN

Input Voltage Range

Output Voltage Accuracy

Maximum Output Current

Current Limit

GND Pin Current

Dropout Voltage

(V

(Nominal)≥3.0V Version)

OUT

Line Regulation

Load Regulation

SHDN Input High Threshold

SHDN Input Low Threshold

SHDN Bias Current

Shutdown Supply Current

Thermal Shutdown Temperature

Output Noise

Ripple Rejection PSRR

Notes: Dropout voltage definition: V

= 1µF, C

IN

OUT

= 1µF, T

= 25°C, unless otherwise specified)

A

Parameter Symbol Test Conditions Min Typ Max Units

V

IN

∆V

OUTIL

I

MAX

I

LIMIT

= 1mA

R

LOAD

= 1Ω

2.5 -- 6 V

-2 -- +2 %

200 -- -- mA

-- 300 -- mA

No Load -- 80 150

I

(Note)

G

V

DROP

∆V

LINEVIN

∆V

LOADIOUT

V

IH

V

IL

I

SD

I

GSD

T

SD

e

NO

- V

IN

OUT

I

= 200mA

OUT

I

= 1mA

OUT

I

= 50mA

OUT

I

= 200mA

OUT

= (V

+0.15) to 6V, I

OUT

= 0mA to 200mA

VIN = 3V to 5.5V

V

= 0V

OUT

CBP = 10nF, C

F = 100Hz, C

when V

is 50 mV below the value of V

OUT

= 10µF

OUT

= 10nF, C

BP

OUT

= 1mA

= 10µF

-- 90 150

-- 1.1 5

-- 55 100

-- 220 300

-0.2 -- +0.2 %/V

-- 0.01 0.04 %/mA

1.0 -- -- V

-- -- 0.4 V

-- -- 100 nA

-- 0.01 1

-- 150 --

nV/

-- 68 --

OUT

at V

IN

= V

OUT

+ 0.5V

µA

mV

µA

°C

Hz

dB

DS9177-02 June 2001 www.richtek-ic.com.tw

3

RT9177

0

Typical Operating Characteristics

Preliminary

75

GND Current vs. Load

74

73

72

71

70

(uA)

G

I

69

68

67

66

65

0 50 100 150 200 250

I

(mA)

OUT

V

vs. V

3.10

3.00

2.90

(V)

2.80 20mA

OUT

V

50mA

2.70

100mA

2.60

2.50

200mA

2.5 3.0 3.5 4.0 4.5 5.0

OUT

VIN (V)

IN

TA = 25°C

V

OUT

T

A

= 3V

= 25°C

Output Voltage Variation vs. Load

0.2

0.1

0.0

-0.1

(%)

OUT

-0.2

V

∆

-0.3

-0.4

-0.5 0 50 100 150 200 25

I

OUT

(mA)

Dropout Voltage vs. Output Current

250

200

150

100

Dropout Voltage (mV)

50

0

20 50 80 110 140 170 200

Output Current (mA)

TA = 25°C

80 C

25 C

V

= 3V

OUT

°

Output Voltage Variation vs. Temperature

1.00

0.75

0.50

0.25

(%)

0.00

OUT

V

-0.25

-0.50

-0.75

-1.00

-40 -10 20 50 80 110 140

Temperature ( C)

°

No Load

71

70

69

68

67

(uA)

G

I

66

65

64

63

GND Current vs. Tem perature

-40 -10 20 50 80 110 140

Temperature ( C)

°

www.richtek-ic.com.tw DS9177-02 June 2001

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