Datasheet G9612DTEU, G9612CTEU, G9612BTEU, G9612ATEU Datasheet (GMT)

Global Mixed-mode Technology Inc.

G9612

Low-Dropout, 500mA Linear Regulator with Reset

Features

500mA Output Current, with Foldback Current



Limiting
High Ripple Rejection



1.5% Output Accuracy



±±±±

2% Reset Threshold Accuracy



±±±±

Externally Programmable Reset Time Delay



Generator
Internal 500mA P-Channel Pass Transistor

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320µA quiescent Current

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Thermal Overload Protection



SOT89-5 Package

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Applications

CD ROM or DVD ROM



Slim-Type CD/DVD



DVD Player



General Description

The G9612 are low-dropout, linear regulator with
reset function supply 3.4V, 3.3V or 2.5V output for
currents up to 500mA. They are available in a 1.0W
SOT 89-5 package with 0.18 inch
Typical dropouts are 560mV at 5V and 500mA.
Other features include foldback current limiting and
thermal overload protection.

The reset function in G9612 detect V
hysteresis, keeping it asserted for time delay deter­mined by external capacitor. The reset output is ac­tive low open-drain output. The detection threshold
are 3.9V or 4.2V.

The output is preset at 3.4V for the G9612A, 3.3V
for the G9612B/C, and 2.5V for G9612D. The reset
threshold is preset at 4.2V for G9612 A/B/D and

3.9V for G9612C.

2

copper heat sink.

level with

CC

Ordering Information

PART

NUMBER

MARKING

REGULATOR

OUTPUT VOLTAGE

G9612ATEU G9612A 3.4 4.2 -40°C to +85°C SOT89-5L

G9612BTEU G9612B 3.3 4.2 -40°C to +85°C SOT89-5L

G9612CTEU G9612C 3.3 3.9 -40°C to +85°C SOT89-5L

G9612DTEU G9612D 2.5 4.2 -40°C to +85°C SOT89-5L

RESET THRESHOLD

VOLTAGE

TEMO.

RANGE

PACKAGE

Pin Configuration Typical Operation Circuit

V

V

CC

CC

R

R

pull-high

pull-high

10k

10k

Ω

Ω

V

V

IN

IN

1µF

1µF

C

C

D

D

G9612

G9612

GND

GND

RESET

RESET

V

V

OUT

OUT

OUTPUT

OUTPUT
VOLTAGE

VOLTAGE

10µF

10µF
(Tantalum or Aluminum)

(Tantalum or Aluminum)

RESET

RESET

RESET

5

5

5

1

1

1

V

V

V

IN

IN

IN

G9612

G9612

G9612

23

23

23

GND

GND

GND

SOT 89-5L

SOT 89-5L

SOT 89-5L

C

C

C

D

D

D

4

4

4

V

V

V

OUT

OUT

OUT

PIN-

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G9612

Absolute Maximum Ratings

Supply Voltage (IN or OUT to GND)..….+0.3V to +6.5V
Input Voltage….…….………………………………+ 6.5V
Continuous Power Dissipation (T
Minimum footprint (

)…..…………………….178°C/W

θ

JA

= +25°C)…...…0.7W

A

With 400mil x 450mil heatsink copper..………..….1.0W

……………………………………………..…125°C/W

θ

JA

Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress rat-

ings only, and 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 affect device reliability

Output Short-Circuit Duration…….……..…..……1 min
Operating Temperature Range……….-40°C to +85°C
Junction Temperature…………….……….……+160°C
Storage Temperature Range….….…-65°C to +160°C
Lead Temperature (soldering, 10sec)……...…+300°C

Electrical Characteristics

VIN=5V, CIN=1µF, C
at V

=5V.

IN

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Voltage VIN 2.5 6.0 V

Output Voltage (Note 1) V

Load Regulation

Line Regulation

Dropout Voltage (Note 2)

Parameter Tempco V

Ripple Rejection PSRR

Output Noise en 20Hz to 100kHz, I

Quiescent Current IQ 320 450 µA

Foldback Current Limit I

Foldback Voltage V

Thermal Shutdown Temperature TSD 160 °C

Thermal Shutdown Hysteresis

Reset Threshold V

Reset Threshold Hysteresis V

Reset Threshold Tempco 40 ppm/°C

CD Delay Pin Threshold Voltage V

CD Pin Sink Current ICD VCC=1.5V, VCD=0.5V 3 4.3 mA

CD Pin Pullup Resistance RD 100 200 400 kΩ

RESET Output Current Low IOL

RESET Function Operating Voltage VOP

Note 1: (VIN-V

OUT

limits.

Note 2: Dropout Voltage is (V

example, the G9612 is tested by measuring the V
100mV below the measured value. The difference (V

Note 3: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

=10µF, TJ =TA=25°C (Note3), unless otherwise noted. Typical values for regulators are

OUT

G9612A 3.35 3.4 3.45

G9612B/C 3.25 3.3 3.35

OUT

V

G9612D 2.45 2.5 2.55

V

I

∆

LDR

V

∆

LNR

VDO I

∆

40 ppm/°C

OUT

LIM

FOLDBACK

TSD 30 °C

∆

TH-

HYS

TCD

) is limited to keep the product (I

- V

IN

) when V

OUT

=1mA to 500mA, VIN=V

OUT

(V

+0.5V) ≤ V

OUT

=500mA

OUT

f=120HZ, I

f=120HZ, I

V

OUT<VFOLDBACK

V

OUT>VFOLDBACK

6V, I

≤

IN

G9612A/B/C 560 610

G9612D 650 700

=30mA 70

OUT

=300mA 65

OUT

=30mA~500mA. 320 µV

OUT

260 400 580

650 900 1200

0.6 0.78 0.95 V

G9612A/B/D 4.11 4.2 4.29

G9612C 3.81 3.9 3.99

G9612A/B/D 150

G9612C 130

VCC = 5V 3.5 3.9 4.3 V

V

=2.5V, V

CC

RESET

sink current>10µA

x (VIN - V

OUT

falls to 100mV below its nominal value at VIN = V

OUT

RESET

OUT

=0.4V

OUT

at VIN = V

- V

IN

+1V 8 17 mV

OUT

=25mA -8 0.3 8 mV

OUT

mV

dB

RMS

mA

V

mV

8 11.5 mA

0.7 0.85 V

)) from exceeding the package power dissipation

+1V. For

OUT

+1V, then VIN is lowered until V

OUT

) is then measured and defined as ∆VDO.

OUT

OUT

falls

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Typical Performance Characteristics

(VIN=5V,CIN=C

CONT Pin vs. Output Load transient

Load Transient Line Transient

=10µF, CONT=VIN, TJ=25°C, unless otherwise noted)

OUT

G9612

Line Transient Line Transient

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Typical Performance Characteristics

(continued)

G9612

Over Current Response Short Circuit Response

Power Supply Rejection Ratio Power Supply Rejection Ratio

Ω

RL=100
CL=10µF

RL=22

CL=10µF

Ω

Power Supply Rejection Ratio Power Supply Rejection Ratio

Ω

Ver: 1.2

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RL=11
CL=10µF

4

RL=6.6
CL=10µF

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Typical Performance Characteristics

Safe Operating Area

0.55

0.5

0.45

0.4

0.35

Load Current(A)

0.3

0.25

minimum footprint

0.2

0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8

Inpout -Output Voltage Differential(V)

(continued)

0.55

0.45

Load Current(A)

0.35

G9612

Safe Operating Area

0.5

0.4

400mil×450mil heatsink

0.3

0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8

Input-Output Voltage Differential(V)

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Pin Description

PIN NO. PIN NAME PIN FUNCTION

1 VIN Regulator Input. Supply voltage can range from 2.5V to 6V.

2 GND Ground

3 V

4 CD External Programmable time delay is set by the capacitor connect to CD pin.

5

THERMAL

THERMAL

PROTECTIO N

PROTECTIO N

1.24V

1.24V

REFERENCE

REFERENCE

Regulator Output. Sources up to 500mA.

OUT

RESET

－

－

＋

＋

RESET

Open-Drain Output remains low while VIN is below the reset threshold,

and for delay time set by C

V

V

IN

IN

MOSFET DRIVER

MOSFET DRIVER
WITH FOLDBACK

WITH FOLDBACK

CURRENT LIMIT

CURRENT LIMIT

GND

GND

D

P

P

V

V

OUT

OUT

R1

R1

R2

R2

after VIN rises above the reset threshold.

－

－

＋

＋

G9612

RESET

RESET

R

R

D

D

C

C

D

D

Figure 1. Functional Diagram

Detailed Description

The G9612 are low-dropout, low-quiescent current
linear regulators with reset function The regulator in
G9612 supply 3.4V, 3.3V or 2.5V output for load cur­rents up to 500mA. The reset function detect V
illustrated in Figure 1, they consist of a 1.24V refer­ence, error amplifier, MOSFET driver, P-channel pass
transistor, and internal feedback voltage divider, reset
threshold comparator and time delay generator.

The 1.24V bandgap reference is connected to the er­ror amplifier’s inverting input. The error amplifier com­pares this reference with the feedback voltage and
amplifies the difference. The MOSFET driver reads the
error signal and applies the appropriate drive to the
P-channel pass transistor. If the feedback voltage is
lower than the reference, the pass transistor gate is
pulled lower, allowing more current to pass and in­creasing the output voltage. If the feedback voltage is
too high, the pass transistor gate is pulled up, allowing
less current to pass to the output.

IN.

As

The G9612 also offer reset function to detect the level
of V

. They assert a reset signal whenever VIN supply

IN

voltage declines below a preset threshold (V

), keep-

TH

ing it asserted for time delay set by capacitor con­nected to C

reset threshold (V

pin, after VIN has resen above the high

D

+ V

TH

HYS

). The

RESET

is an active

low, open-drain output.

Internal P-Channel Pass Transistor

The G9612 feature a 500mA P-channel MOSFET
pass transistor. This provides several advantages over
similar designs using PNP pass transistors, including
longer battery life. The P-channel MOSFET requires
no base drive, which reduces quiescent current con­siderably. PNP based regulators waste considerable
amounts of current in dropout when the pass transistor
saturates. They also use high base-drive currents un­der large loads. The G9612 do not suffer from these
problems and consume only 320µA of quiescent cur­rent.

Additional blocks of linear regulator include a foldback
current limiter, reverse current protection, and thermal
sensor.

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Foldback Current Limiting

The G9612 also include a foldback current limiter. It
monitors and controls the pass transistor’s gate volt­age, estimating the output current and limiting it to
900mA for output voltages above 0.78V. If the output
voltage drops below 0.78V, implying a short-circuit
condition, the output current is limited to 400mA.

Thermal Overload Protection

Thermal overload protection limits total power dissipa­tion in the G9612. When the junction temperature ex-

P

P

= +160°C, the thermal sensor sends a signal

J

= +160°C should not be exceeded.

J

OUT

(T

)

MAX

= (V

D

=

2

J-TA

+

θ

) x I

CA

OUT

)

= 125°C/W.

θ

JA

(

θ

JC

) is the temperature difference between

J -TA

copper heat sink is

- V

IN

OUT

(VIN-V

θ

OUT

JC

θ

).

is

CA

ceeds T
to the shutdown logic, turning off the pass transistor
and allowing the IC to cool. The thermal sensor will
turn the pass transistor on again after the IC’s junction
temperature cools by 30°C, resulting in a pulsed out­put during thermal overload conditions.

Thermal overload protection is designed to protect the
G9612 in the event of fault conditions. For continual
operation, the absolute maximum junction temperature
rating of T

Operating Region and Power Dissipation

Maximum power dissipation of the G9612 depends on
the thermal resistance of the case and circuit board,
the temperature difference between the die junction
and ambient air, and the rate of air flow. The power
dissipation across the device is P = I
The resulting maximum power dissipation is:

where (T
the G9612 die junction and the surrounding air,

the thermal resistance of the package chosen, and
is the thermal resistance through the printed circuit

board, copper traces and other materials to the sur­rounding air. The thermal resistance of SOT89-5 with

0.18 inch

The power dissipation of G9612 is:

G9612

The worst-case thermal resistance from junction to
air (

Use larger copper pad area to obtain specific heat sink
thermal resistance values for larger output current,
higher input-output difference, and higher ambient
temperature.

C

The reset timeout delay is set by internally pull-up R
(typical value 200kΩ) and external C

When the voltage at C

old, typically 0.85 V
voltage detector and buffer have built-in hysterisis to
prevent erratic reset operation. For C
reset time delay is 10ms.

Regulator Output Capacitor Selection and Regula­tor Stability

Normally, use capacitors 0.1µF minimum on the input
and 10µF minimum on the output of the G9612. The
larger input capacitor values provide better supply noise
rejection and line-transient response. Improve load tran­sient response, stability, and power-supply rejection by
using large output capacitors. For stable operation over
the full temperature range and with load current up to
500mA, 10µF tantalum or 47µF aluminum minimum is
recommended. Too small capacitors with small ESR
can result in oscillation.

Transient Considerations

The
G9612 load-transient response. Two components of
the output response can be observed on the
load-transient graphs—a DC shift from the output im­pedance due to the different load currents, and the
transient response. Typical transients for step
changes in the load current from 5mA to 500mA are

0.1V. Increasing the output capacitor’s value attenu­ates transient spikes.

) requirements are:

θ

JA

(150°C -T

=

θ

JA

Capacitor Selection

D

)

A

P

D

pin exceeds the buffer thresh-

D

, the

CC

RESET

Typical Operating Characteristics

.

D

output high. The

= 0.1µF, typical

D

show the

D

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Package Information

A

A

C

C

D

D

I

I

H

H

G

G

G9612

F

F

E

E

B

B

K

K

J

J

L

L

SYMBOL

A 4.40 4.60 0.173 0.181

B 4.05 4.25 0.159 0.167

C 1.50 1.70 0.059 0.067

D 1.30 1.50 0.051 0.059

E 2.40 2.60 0.094 0.102

F 0.80 ----- 0.031 -----

G 3.00 REF 0.118 REF

H 1.50 REF 0.059 REF

I 0.40 0.52 0.016 0.020

J 1.40 1.60 0.055 0.063

K 0.35 0.41 0.014 0.016

L 5º TYP 5º TYP

Taping Specification

DIMENSION IN MM DIMENSION IN INCH

MIN. MAX. MIN. MAX.

Feed Direction

SOT 89-5L Package Orientation

SOT 89-5L Package Orientation

GMT Inc. d oes not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at any time without notice to change said circuitry and specifications.

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