Datasheet G914 Datasheet (GMT)

Global Mixed-mode Technology Inc.

150mA Low-Dropout Linear Regulators

Features

Low, 52µA Ground Current

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Guaranteed 150mA Output Current

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Dropout Voltage is 100mV @ 50mA Load

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Over-Temperature Protection and Short-Circuit

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Protection

Adjustable Mode: from 2.5V to 5.5V

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Max. Supply Current in Shutdown Mode < 1µA

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Low Output Noise is 170 µV

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Applications

Notebook Computers

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Cellular Phones

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PDAs

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Digital still Camera and Video Recorders

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Hand-Held Devices

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Bar Code Scanners

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RMS

G914

General Description

The G914 is a low supply current, low dropout linear
regulator that comes in a space saving SOT23-5 pack­age. The supply current at no-load is 52µA. In the
shutdown mode, the maximum supply current is less
than 1µA. Operating voltage range of the G914 is from

2.5V to 5.5V. The over-current protection limit is set at
370mA typical and 150mA minimum. An overtem­perature protection circuit is built-in in the G914 to
prevent thermal overload. These power saving fea­tures make the G914 ideal for use in the bat­tery-powered applications such as notebook com­puters, cellular phones, and PDA’s.

The G914 is a adjustable output version in a small
SOT 23-5 package.

Ordering Information

Pin Configuration

1

1

1

IN

IN

IN

2

2

2

GND

GND

GND

SHDN

SHDN

SHDN

3

3

3

G914

G914

G914

SOT23-5

SOT23-5

SOT23-5

PART MARKING VOLTAGE

TEMP.

RANGE

PIN-

PACKAGE

G914 14 Adjustable -40°C~ +85°C SOT 23-5

OUTPUT

OUTPUT

C

C

C
1µF

1µF

1µF

OUT

OUT

OUT

OUTPUT
VOLTAGE

VOLTAGE

VOLTAGE

OUT

OUT

G914

G914

G914

GND

GND

GND

OUT

ADJ

ADJ

ADJ

R1

R1

R1

R2

R2

R2

470pF

470pF

470pF

IN

IN

5

5

5

OUT

OUT

OUT

＋

＋

＋

C

C

－

－

－

BATTERY

BATTERY

BATTERY

4

4

4

ADJ

ADJ

ADJ

V

V

V

OUT

OUT

OUT

C
1µF

1µF

1µF

=1.250 X ( R2/R1+1)

=1.250 X ( R2/R1+1)

=1.250 X ( R2/R1+1)

IN

SHDN

SHDN

SHDN

IN

IN

IN

Adjustable mode

Adjustable mode

Adjustable mode

Ver 0.2 Preliminary

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Absolute Maximum Ratings

VIN to GND……………………………………-0.3V to +7V
Output Short-Circuit Duration………………….….Infinite
SET to GND.……………………………..…..-0.3V to +7V

SHDN to GND…………………..………….-0.3V to +7V
SHDNto IN….…………………..…………..-7V to +0.3V

OUT to GND…………………………-0.3V to (V

Stresses beyond those li sted under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stres s rat­ings only, and functional operat i on of the device at these or any other condit i ons beyond those indicated in the operational sections of
the specifications is not implied. Exposure to absolute maximum rating c ondi tions for extended periods may affect devi ce reliability.

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Continuous Power Dissipation (T
SOT23-5……………………………………...…..568 mW
Operating Temperature Range………...-40°C to +85°C
Junction Temperature……………………….……+150°C

….…..……………….…………….…..…..220°C/Watt

θ

JA

Storage Temperature Range………….-65°C to +160°C
Lead Temperature (soldering, 10sec)..…………+300°C

+ 0.3V)

IN

= +25°C)

A

G914

Electrical Characteristics

(V

= V

OUT

+1V;

IN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Voltage (Note 2) VIN Note2 5.5 V
Output Voltage Accuracy V
Adjustable Output Voltage Range (Note 3) V
Maximum Output Current 150 mA
Current Limit I

Ground Pin Current IQ

Dropout Voltage (Note 3) V

Line Regulation
Load Regulation

Output Voltage Temperature Coefficient ∆VO / ∆T I

Output Voltage Noise (10HZ to 100KHZ) en IL = 150mA

SHUTDOWN

SHDN

Input Threshold

SHDN

Input Bias Current

Shutdown Supply Current I

ADJ INPUT

ADJ Input Leakage Current I

THERMAL PROTECTION

Thermal Shutdown Temperature T
Thermal Shutdown Hysteres is

Note 1: Limits is 100% production tested at T

maintain junction temperature as close to ambient as possible.

Note 2: V

IN (min)

= V

Note 3: The dropout voltage is defined as (V

= VIN; CIN = C

V

SHDN

+V

OUT

DROP

= 1µF = TA = TJ = +25°C, unless otherwise noted.) (Note 1)

OUT

Variation from specified V

OUT

2.5 5.5 V

OUT

V

LIM

DROP

V

VIN=VO +0.1V to 5.5V , I

∆

LNR

V

I

∆

LDR

= 0V 370 mA

OUT

I

= 0mA

LOAD

= 150mA

I

LOAD

I

= 1mA 2

OUT

I

= 50mA 100

OUT

I

=150mA 340

OUT

= 0mA to 150mA 8 25 mV

OUT

= 40mA, TJ = 25°C to 125°C 40 ppm/°C

OUT

VIH Regulator enabled 2
V

Regulator shutdown 0.4

IL

V

I

SHDN

V

QSHDN

V

ADJ

150 °C

SHDN

T

15 °C

∆

SHDN

= VIN

SHDN

= 0V TA = +25°C 0.06 1 µA

OUT

= 1.3V TA = +25°C 5 30 nA

ADJ

= +25°C. Low duty pulse techniques are used during test to

A

, I

OUT

=1mA -3 3 %

OUT

52 80 µA

= 1m A 0.1 %/V

OUT

C

= 470pF 192

ADJ

C

= 10nF 170

ADJ

T

= +25°C

A

0.007 0.1 µA

µV

mV

RMS

V

.

IN-VOUT

) when V

is 100mV below the value of V

OUT

for VIN = V

OUT

OUT

+2V.

Ver 0.2 Preliminary

Jul 19, 2002

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Pin Description

NAME

PIN

1 IN Regulator Input. Supply vol tage can range from +2.5V to +5.5V. Bypass with 1µF to GND
2 GND

3

4 ADJ

5 OUT

SHDN

Ground. This pin als o functions as a heatsink . Solder to lar ge pads or the circui t board gr ound plane to
maximize thermal dissipation.
Active-Low Shutdown Input. A logic low reduces the supply current to less than 1µA. Connect to IN for normal
operation.
Adjust (Input): Adjustable regulator feedback input. It can connect to an external res istor divi der for ad­justable output voltage. It also must connect ≥470pF ceramic capacit or from ADJ pin to GND for r educe
output noise.
Regulator Output. Fixed or adjus table from +2.5V to +5.5V. Sour ces up to 150mA. Bypass wit h a 1µF,

0.2Ω typical ESR capacit or to GND.

＜

FUNCTION

G914

Detailed Description

The block diagram of the G914 is shown in Figure 1. It
consists of an error amplifier, 1.25V bandgap refer­ence, PMOS output transistor, shutdown logic, over
current protection circuit, and over temperature protec­tion circuit.

The G914 can be adjusted to a specific output voltage
by using two external resistors (Figure 2). The resis­tors set the output voltage based on the following
equation:

V

OUT

=1.250V X

R2
R1

+ 1

IN

IN

SHDN

SHDN

SHUTDOWN

SHUTDOWN

LOGIC

LOGIC

This equation is correct due to the configuration of the
bandgap reference. The bandgap voltage is relative to
the output, as seen in the block diagram. Traditional
regulators normally have the reference voltage relative
to ground and have a different V

equation. Resistor

OUT

values are not critical because ADJ (adjust)has a high
input impedance, but for best results use resistors of
470kΩ or less. A capacitor from ADJ to ground pro­vides greatly improved noise performance.

ERROR

ERROR

AMP.

AMP.

＋

＋

GND

GND

Ver 0.2 Preliminary

Jul 19, 2002

OVER TEMP. &

OVER TEMP. &

OVER CURRENT

OVER CURRENT

PROTECTION

PROTECTION

1.25V

1.25V
ref

ref

Figure 1. Functional Diagram

3

OUT

OUT

ADJ

ADJ

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＋

＋

－

－

BATTERY

BATTERY

Over Current Protection

The G914 use a current mirror to monitor the output
current. A small portion of the PMOS output transis­tor’s current is mirrored onto a resistor such that the
voltage across this resistor is proportional to the out­put current. This voltage is compared against the ref­erence voltage. Once the output current exceeds the
limit, the PMOS output transistor enters constant cur­rent mode. The current is set to 370mA typically.

Over Temperature Protection

To prevent abnormal temperature from occurring, the
G914 has a built-in temperature monitoring circuit.
When it detects the temperature is above 150
output transistor is turned off. W hen the IC is cooled
down to below 135
this way, the G914 will be protected against abnormal
junction temperature during operation.

Shutdown Mode

When the
the G914 enters shutdown mode. All the analog cir­cuits are turned off completely, which reduces the
current consumption to only the leakage current. The
output is disconnected from the input. When the out­put has no load at all, the output voltage will be dis­charged to ground through the internal resistor voltage
divider.

Operating Region and Power Dissipation

Since the G914 is a linear regulator, its power dissipa­tion is always given by P = I
maximum power dissipation is given by:

P

D(MAX)

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OUTPUT

OUT

OUT

OUTPUT
VOLTAGE

VOLTAGE

R

R

L

L

o

C, the

). The

OUT

OUT

OUT

IN

IN

R1

R1

R2

R2

470pF

470pF

C

C
1µF

1µF

C

C
1µF

1µF

G914

G914

ADJ

ADJ

SHDN

SHDN

IN

IN

GND

GND

Figure 2. Adjustable Output Using External

Feedback Resistors

o

C, the output is turned on again. In

pin is connected a logic low voltage,

SHDN

(VIN – V

OUT

= (TJ–TA)/

,=150oC-25oC/220oC/W= 568mW

θ

JA

G914

of the chosen package to the ambient air. In the case
of a SOT23-5 package, the thermal resistance is typi­cally 220

The die attachment area of the G914’s lead frame is
connected to pin 2, which is the GND pin. Therefore,
the GND pin of G914 can carry away the heat of the
G914 die very effectively. To improve the power dis­sipation, connect the GND pin to ground using a large
ground plane near the GND pin.

Applications Information

Capacitor Selection and Regulator Stability

Normally, use a 1µF capacitor on the input and a 1µF
capacitor on the output of the G914. Larger input ca­pacitor values and lower ESR provide better sup­ply-noise rejection and transient response. A higher­value input capacitor (10µF) may be necessary if large,
fast transients are anticipated and the device is lo­cated several inches from the power source.

Power-Supply Rejection and Operation from Sources
Other than Batteries

The G914 is designed to deliver low dropout voltages
and low quiescent currents in battery powered sys­tems. Power-supply rejection is 42dB at low frequen­cies.

When operating from sources other than batteries,
improve supply-noise rejection and transient response
by increasing the values of the input and output ca­pacitors, and using passive filtering techniques.

Load Transient Considerations

The G914 load-transient response graphs show two
components of the output response: a DC shift of the
output voltage due to the different load currents, and
the transient response. Typical overshoot for step
changes in the load current from 0mA to 100mA is
12mV. Increasing the output capacitor's value and
decreasing its ESR attenuates transient spikes.

Input-Output (Dropout) Voltage

A regulator's minimum input-output voltage differential
(or dropout voltage) determines the lowest usable
supply voltage. In battery-powered systems, this will
determine the useful end-of-life battery voltage. Be­cause the G914 use a P-channel MOSFET pass tran­sistor, their dropout voltage is a function of R
multiplied by the load current.

o

C/Watt.

DS(ON)

Where (T

) is the temperature difference the G914

J–TA

die and the ambient air,

Ver 0.2 Preliminary

Jul 19, 2002

, is the thermal resistance

θ

JA

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Layout Guide

An input capacitance of ≅ 1µF is required between the
G914 input pin and ground (the amount of the capaci­tance may be increased without limit), This capacitor
must be located a distance of not more than 1cm from
the input and return to a clean analog ground.

Input capacitor can filter out the input voltage spike
caused by the surge current due to the inductive effec t
of the package pin and the printed circuit board’s

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G914

routing wire. Otherwise, the actual voltage at the IN
pin may exceed the absolute maximum rating.

The output capacitor also must be located a distance
of not more than 1cm from output to a clean analog
ground. Because it can filter out the output spike
caused by the surge current due to the inductive effec t
of the package pin and the printed circuit board’s
routing wire. Figure 3 is suggested PCB layout of
G914.

Figure 3. Suggested PCB Layout

*Distance between pin & capacit or must no more than 1cm

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Package Information

A2

A2

b

b

e1

e1

G914

C

D

D

H

H

E

E

e

e

A

A

A1

A1

C

L

L

1

1

θ

θ

Note:

1. Package body sizes exclude mold flash protrusions or gate burrs

2. Tolerance ±0.1000 mm (4mil) unless otherwise specified

3. Coplanarity: 0.1000mm
Dimension L is measured in gage plane

4.

SYMBOLS

A 1.00 1.10 1.30
A1 0.00 ----- 0.10
A2 0.70 0.80 0.90

b 0.35 0.40 0.50

C 0.10 0.15 0.25

D 2.70 2.90 3.10

E 1.40 1.60 1.80

e ----- 1.90(TYP) ----­e1 ----- 0.95 -----

H 2.60 2.80 3.00

L 0.37 ------ -----

1

θ

MIN

1º 5º 9º

DIMENSIONS IN MILLIMETERS

Taping Specification

NOM MAX

Feed Direction

Feed Direction

SOT23-5 Package Orientation

SOT23-5 Package Orientation

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