Richtek RT9198T-18PBR, RT9198T-25PB, RT9198T-25PV, RT9198T-28PU5R, RT9198T-33PU5 Schematic [ru]

RT9198T

300mA, Thermal Folded Back CMOS LDO Regulator

General Description

The RT9198T is designed for portable RF and wireless

applications with demanding performance and space

requirements. The RT9198T performance is optimized for

battery-powered systems to deliver ultra low noise and

low quiescent current. Regulator ground current increases

only slightly in dropout, further prolonging the battery life.

The RT9198T also works with low-ESR ceramic capacitors,

reducing the amount of board space necessary for power

applications, critical in hand-held wireless devices. The

RT9198T consumes less than 0.01uA in shutdown mode

and has fast turn-on time less than 50μs. RT9198T is short

circuit thermal folded back protected. RT9198T lowers its

OTP trip point from 165°C to 110°C when output short

circuit occurs (V

< 0.4V) providing maximum safety to

OUT

end users. The other features include ultra low dropout

voltage, high output accuracy, current limiting protection,

and high ripple rejection ratio. Available in the SOT-23-3,

SOT-23-5 and SC-70-5 packages, the RT9198T also offers

a range of 1.5V to 3.5V with 0.1V per step.

Ordering Information

RT9198T-

Package Type
U5 : SC-70-5
U5R : SC-70-5 (R-Type)
V : SOT-23-3
B : SOT- 23-5
BR : SOT- 23-5 (R-Type)

Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)

Output Voltage
15 : 1.5V
16 : 1.6V
:
34 : 3.4V
35 : 3.5V
1H : 1.85V

Note :

Richtek products are :

` RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

` Suitable for use in SnPb or Pb-free soldering processes.

2H : 2.85V

Features

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Short Circuit Thermal Folded Back Protection

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z Low-Noise for RF Application

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z Fast Response in Line/Load Tran sient

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z Quick Start-Up (T ypically 50us)

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z < 0.01uA Standby Current When Shutdown

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z Low Dropout : 220mV @ 300mA

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z Wide Operating Voltage Ranges : 2.5V to 5.5V

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z TTL-Logic-Controlled Shutdown Input

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z Low Temperature Coefficient

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z Current Limiting Protection

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z Thermal Shutdown Protection

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z Only 1uF Output Capacitor Required for Stability

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z High Power Supply Rejection Ratio

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z Custom Voltage Available

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z RoHS Compliant and 100% Lead (Pb)-Free

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Applications

z CDMA/GSM Cellular Handsets

z Battery-Powered Equipment

z Laptop, Palmtops, Notebook Computers

z Hand-Held Instruments

z PCMCIA Cards

z Portable Information Appliances

Marking Information

For marking information, contact our sales representative

directly or through a Richtek distributor located in your

area.

Pin Configurations

(TOP VIEW)

VIN

3

2

GND VOUT

SOT-23-3

DS9198T-04 April 2011 www.richtek.com

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RT9198T

VIN VOUT

5

EN NC GND

4

23

Typical Application Circuit

V

IN

Chip Enable

Functional Pin Description

C

1uF

VOUT NC

5

VIN GND EN

4

23

SOT-23-5/SC-70-5 (R-Type)SOT-23-5/SC-70-5

RT9198T

VIN

VOUT

IN

EN

GND

C

1uF

OUT

V

OUT

Pin Name Pin Function

EN

Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100kΩ

resistor connected to GND when the control signal is floating.

NC No Connection

GND Ground

VOUT Output Voltage

VIN Input Voltage

Function Block Diagram

EN

V

REF

Shutdown

and

Logic Control

+

-

Error

Amplifier

VIN

MOS Driver

VOUT

Current-Limit

and

Thermal

Protection

GND

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RT9198T

Absolute Maximum Ratings (Note 1)

z Supply Input Voltage ---------------------------------------------------------------------------------------------------- 6V

z Power Dissipation, P

SOT-23-3------------------------------------------------------------------------------------------------------------------- 0.4W

SOT-23-5------------------------------------------------------------------------------------------------------------------- 0.4W

SC-70-5 -------------------------------------------------------------------------------------------------------------------- 0.3W

z Package Thermal Resistance (Note 2)

SOT-23-3, θJA------------------------------------------------------------------------------------------------------------- 250°C/W

SOT-23-5, θJA------------------------------------------------------------------------------------------------------------- 250°C/W

SC-70-5, θJA--------------------------------------------------------------------------------------------------------------- 333°C/W

z Junction Temperature --------------------------------------------------------------------------------------------------- 150°C

z Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------- 260°C

z Storage Temperature Range ------------------------------------------------------------------------------------------- −65°C to 150°C

z ESD Susceptibility (Note 3)

HBM (Human Body Mode) --------------------------------------------------------------------------------------------- 2kV

MM (Machine Mode) ---------------------------------------------------------------------------------------------------- 200V

Recommended Operating Conditions (Note 4)

@ TA = 25°C

D

z Supply Input Voltage ---------------------------------------------------------------------------------------------------- 2.5V to 5.5V

z Operation Ambient Temperature Range -----------------------------------------------------------------------------

z Operation Junction Temperature Range -----------------------------------------------------------------------------

−40°C to 85°C

−40°C to 125°C

Electrical Characteristics

(V

= V

OUT

+ 1V, C

IN

Output Voltage Accuracy ΔV

Current Limit I

Quiescent Current IQ

Dropout Voltage (Note 5) V

Line Regulation ΔV

Load Regulation ΔV

Standby Current I

EN Input Bias Current I

EN Threshold

Power Supply
Rejection Rate

= C

IN

= 1uF, TA = 25°C, unless otherwise specified)

OUT

Parameter Symbol Test Conditions Min Typ Max Unit

I

OUT

R

LIM

DROP

LINE

LOAD

VEN = GND, Shutdown -- 0.01 1 uA

STBY

VEN = GND or VIN -- 0 100 nA

IBS D

Logic-Low Voltage VIL V

Logic-High Voltage V

VIN = 3V to 5.5V, Start-Up 1.2 -- --

IH

= 1mA −2 -- +2 %

OUT

= 1Ω 360 400 -- mA

LOAD

V

>= 1.2V, I

EN

I

= 200mA -- 170 200

OUT

= 300mA -- 220 330

I

OUT

= (V

V

IN

OUT

= 1mA

I

OUT

1mA < I

OUT

= 3V to 5.5V, Shutdown -- -- 0.4

IN

= 0mA

OUT

+ 1V) to 5.5V,

< 300mA -- -- 0.6 %

-- 90 130 uA

-- -- 0.3 %

mV

f = 100Hz -- −60 --

f = 10kHz

PSRR C

OUT

= 1uF, I

= 100mA

OUT

-- −30 --

dB

V

Thermal Shutdown Temperature TSD -- 165 -- °C

Thermal Shutdown Temperature
Hysteresis

-- 30 -- °C

ΔT

SD

Thermal Folded Back -- 110 -- °C

DS9198T-04 April 2011 www.richtek.com

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RT9198T

Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for

stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the

operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended

periods may remain possibility to affect device reliability.

Note 2. θ

Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. The dropout voltage is defined as V

is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of

JA

JEDEC 51-3 thermal measurement standard.

-V

IN

, which is measured when V

OUT

OUT

is V

OUT(NORMAL)

− 100mV.

DS9198T-04 April 2011www.richtek.com

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