Richtek RT9170-12GV, RT9170-12PB, RT9170-14GV, RT9170-15PB, RT9170-18GV Schematic [ru]

RT9170

300mA CMOS LDO Regulator with 15

General Description

The RT9170 is CMOS ultra low quiescent current and low
dropout (ULDO) regulators. The devices are capable of
supplying 300mA of output current continuously .

The RT9170's performance is optimized for battery­powered systems to deliver 15uA ultra low quiescent
current and extremely low dropout voltage. Regulator
ground current increa ses only slightly in dropout, further
prolonging the battery life. The other features include ultra
low dropout voltage, high output accura cy , current limiting
protection, and high ri pple rejection ratio.

The devices are available in fixed output voltages ra nge of

1.2V to 3.3V with 0.1V per step. The RT9170 regulators
are available in SOT -23-3, SOT-23-5 a nd 3-lea d SOT-89
pack ages.

Ordering Information

RT9170-

Package Type
V: SOT-23-3
B: SOT-23-5
X : SOT-89

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

Output Voltage
12 : 1.2V
13 : 1.3V
:
32 : 3.2V
33 : 3.3V

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.

Features

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Ultra-Low Quiescent Current (T ypically 15uA)

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z Guaranteed 300mA Output Current

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z Low Dropout : 240mV at 300mA

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z Wide Operating Voltage Ranges : 2V to 5.5V

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z Fast Transient Response

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z Tight Load and Line Regulation

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z TTL-Logic-Controlled Enable Input

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z Current Limiting & Thermal 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 Cellular Phones and Pagers
z Battery-Powered Equipment
z Laptop, Palmtops, Notebook Computers
z Hand-Held Instruments
z PCMCIA Cards

Pin Configurations

GND

μμ

μA Quiescent Current

μμ

(TOP VIEW)

VIN

3

2

VOUT

231

EN

5

GND

23

VIN

SOT-23-5SOT-23-3

NC

4

VOUT

VIN

GND VOUT

Marking Information

For marking information, conta ct our sales representative

(TAB)

SOT-89

directly or through a Richtek distributor located in your
area.

DS9170-14 April 2011 www.richtek.com

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RT9170

T ypical Application Circuit

V

IN

Chip Enable

Functional Pin Description

Pin No .

SOT-23-3 SOT-23-5 SOT-89

3 2 2 VIN Power Input Voltage.
2 3 3 VOUT Output Voltage.
1 1 1 GND Ground.

- 5 -

- 4 - NC No Internal Connection.

Function Block Diagram

V

C
1uF

IN

VIN

RT9170- xB

EN

VOUT

GND

C
1uF

OUT

OUT

Pin Name Pin Functi on

EN

Chip Enable (Active Low).

EN

VIN

+

-

Current Limit

&

Thermal Shutdown

VOUT

GND

DS9170-14 April 2011www.richtek.com

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RT9170

Absolute Maximum Ratings (Note 1)

z Supply Input V oltage ------------------------------------------------------------------------------------------------ 7V
z Power Dissipation, P

SOT-23-3--------------------------------------------------------------------------------------------------------------- 0.4W
SOT-23-5--------------------------------------------------------------------------------------------------------------- 0.4W

SOT-89 ----------------------------------------------------------------------------------------------------------------- 0.571W

z Package Thermal Resistance (Note 2)

SOT-23-3, θJA--------------------------------------------------------------------------------------------------------- 250°C/W
SOT-23-5, θJA--------------------------------------------------------------------------------------------------------- 250°C/W

SOT -89, θJA----------------------------------------------------------------------------------------------------------- 175°C/W

z Junction T emperature ----------------------------------------------------------------------------------------------- 150°C
z Storage T emperature 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)

z Supply Input V oltage ------------------------------------------------------------------------------------------------ 2V to 5.5V
z Enable Input V oltage ------------------------------------------------------------------------------------------------ 0V to 5.5V
z Junction T emperature Range -------------------------------------------------------------------------------------- −40°C to 125°C

D

@ T

= 25°C

A

Electrical Characteristics

(V

= V

IN

+ 1V, CIN = C

OUT

= 1uF, T

OUT

Parameter Symbol Test Conditions Min Typ Max Unit

Output Voltage Accuracy
Current Limit I
Quiescent Current (Note 5)
Dr opout Voltag e

Line Regulation

Load Regulation (Note 6)
Standby Current (Note 7) I

EN Threshold

Logic-Low Voltage

Logic-High Voltage
Power Supply Rejection PSRR
Thermal Shutdown Temperature

= 25° C, unless otherwise specified)

A

ΔV

LIM

I

Q

V

DROP

ΔV

ΔV

STBY

V

IL

V

IH

T

SD

I

OUT

R

I

LINE

1mA < I

LOAD

V

V

= 1mA −2

OUT

LOAD

V

≤ 0.6V,

EN

= 300mA -- 240 --

OUT

V

= (V

IN

= 1mA

I

OUT

≥ 2V (Shutdown), VIN = 5.5V

V

EN

= 2V to 5.5V, Enable

IN

= 2V to 5.5V, Shutdown

IN

f = 1kHz, C

-- 150 --

-- +2 %

= 1Ω 300 -- --

IOUT

= 0m A

-- 15 --

mA

μA

mV

+ 0.3V) to 5.5V ,

OUT

< 300mA

OUT

−0.3

0.018 +0.3 %/V

-- 0.01 0.04 %/mA

-- 0.1 -- μA

-- -- 0.6
V

2 -- --

OUT

= 1μF

-- −40 -- dB

°C

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RT9170

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. Quiescent, or ground current, is the difference between input and output currents. It is defined by I

Note 6. Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested for load

Note 7. Standby current is the input current drawn by a regulator when the output voltage is disabled by a shutdown signal

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.

= IIN - I

load condition (I

Q

= 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin

OUT

OUT

current.

regulation in the load range from 1mA to 300mA.

2V). It is mea sured with VIN = 5.5V.

(V

EN

≥

under no

DS9170-14 April 2011www.richtek.com

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Typical Operating Characteristics

RT9170

Temperature Stability

2.55

2.53

2.51

2.49

2.47

2.45

2.43

2.41

Output Voltage (V)1

VIN = 3.5V
V

2.39

2.37

2.35

= 2.5V

OUT

C

= 1uF (Ceramic)

IN

C

= 1uF (Ceramic)

OUT

-35 -15 5 25 45 65 85 105 125

Temperature

I

LOAD

No Load

= 250mA

(°C)

Quiescent Current vs. Temperature

18
16
14
12
10

Quiescent Current (uA) 1

I

= 200mA

LOAD

No Load

8
6

VIN = 3.5V

4

V

= 2.5V

OUT

C

= 1uF (Ceramic)

IN

2

C

= 1uF (Ceramic)

OUT

0

-35-155 25456585105125

Temperature

(°C)

Quiescent Current vs. Load Current

18
17
16
15
14
13

VIN = 3.5V

12

V

= 2.5V

OUT

Quiescent Current (uA) 1

C

= 1uF (Ceramic)

IN

11

C

= 1uF (Ceramic)

OUT

10

0 0.05 0.1 0.15 0.2 0.25 0.3

Load Current (A)

Quiescent Current vs. Supply Voltage

18
16
14
12
10

8
6
4

Quiescent Current (uA) 1

2
0

I

= 200mA

LOAD

V

= 2.5V

OUT

C

= 1uF (Ceramic)

IN

C

= 1uF (Ceramic)

OUT

22.533.544.555.5

Supply Voltage (V)

No Load

Dropout Voltage vs. Load Current

300

V

= 3.3V

OUT

250

TJ = 125°C

200

TJ = 25°C

150

100

Dropout Voltage (mV)

50

0

0 0.05 0.1 0.15 0.2 0.25 0.3

Load Current (A)

TJ = -40°C

Output Voltage (V)1

2.55

2.53

2.51

2.49

2.47

2.45

Output Voltage vs. Supply Voltage

V

= 2.5V

OUT

C

= 1uF (Ceramic)

IN

C

= 1uF (Ceramic)

OUT

I

= 1mA

LOAD

2.5 3 3.5 4 4.5 5 5.5

Su pply Vol tage ( V )

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