G9612 [GMT]
Low-Dropout, 500mA Linear Regulator with Reset; 低压差， 500mA线性稳压器，带有复位
| 型号： | G9612 |
| 厂家： | 
GLOBAL MIXED-MODE TECHNOLOGY INC |
| 描述： | Low-Dropout, 500mA Linear Regulator with Reset |
| 文件： | 总8页 (文件大小：539K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Global Mixed-mode Technology Inc.
G9612
Low-Dropout, 500mA Linear Regulator with Reset
Features
General Description
500mA Output Current, with Foldback Current
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 89-5L package with 0.18 inch2 copper heat
sink. Typical dropouts are 560mV at 5V and 500mA.
Other features include foldback current limiting and
thermal overload protection.
Limiting
High Ripple Rejection
±2% Output Accuracy
±2% Reset Threshold Accuracy
Externally Programmable Reset Time Delay
Generator
Internal 500mA P-Channel Pass Transistor
320µA quiescent Current
Thermal Overload Protection
SOT89-5 Package
The reset function in G9612 detect VCC level with
hysteresis, keeping it asserted for time delay de-
termined by external capacitor. The reset output is
active low open-drain output. The detection thresh-
old are 3.9V or 4.2V.
Applications
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.
CD ROM or DVD ROM
Slim-Type CD/DVD
DVD Player
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
REGULATOR
OUTPUT VOLTAGE
RESET THRESHOLD
TEMP.
RANGE
MARKING
PACKAGE
VOLTAGE
G9612ATEU
G9612BTEU
G9612CTEU
G9612DTEU
G9612ATEUf
G9612BTEUf
G9612CTEUf
G9612DTEUf
9612AX
9612BX
9612CX
9612DX
3.4
3.3
3.3
2.5
4.2
4.2
3.9
4.2
-40°C to +85°C SOT-89-5
-40°C to +85°C SOT-89-5
-40°C to +85°C SOT-89-5
-40°C to +85°C SOT-89-5
Pin Configuration
Typical Operation Circuit
VCC
G9612
Rpull-high
10kΩ
RESET
CD
4
5
VIN
1µF
RESET
G9612
OUTPUT
VOLTAGE
VOUT
CD
GND
10µF
1
2
3
(Tantalum or Aluminum)
VOUT
VIN
GND
SOT-89-5
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.7
Apr 01, 2005
1
Global Mixed-mode Technology Inc.
G9612
Absolute Maximum Ratings
Supply Voltage (IN or OUT to GND)…...…0.3V to 6.5V
Input Voltage….………………………………………6.5V
Thermal Resistance Junction to Ambient, (θJA)
SOT-89-5...……………………….….……….…135°C/W
Thermal Resistance Junction to Case, (θJc)
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
Reflow Temperature (soldering, 10sec)………260°C
SOT-89-5..…….………………….….….……..…24°C/W
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings
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
Electrical Characteristics
VIN=5V, CIN=1µF, COUT=10µF, TJ =TA=25°C (Note3), unless otherwise noted. Typical values for regulators are
at VIN =5V.
PARAMETER
Input Voltage
SYMBOL
CONDITION
MIN
2.5
3.332
3.234
2.45
---
TYP
---
MAX
6.0
3.468
3.366
2.55
17
UNIT
VIN
V
G9612A
G9612B/C
G9612D
3.4
3.3
2.5
8
Output Voltage (Note 1)
VOUT
V
Load Regulation
Line Regulation
ΔVLDR
ΔVLNR
I
OUT=1mA to 500mA, VIN=VOUT +1V
mV
mV
(VOUT+0.5V) ≤ VIN ≤ 6V, IOUT =25mA
-8
0.3
560
650
40
8
G9612A/B/C
---
610
700
---
Dropout Voltage (Note 2)
Parameter Tempco VOUT
Ripple Rejection
ΔVDO
I
OUT=500mA
mV
ppm/°C
dB
G9612D
---
---
f=120HZ, IOUT=30mA
---
70
---
PSRR
f=120HZ, IOUT=300mA
---
65
---
Output Noise
en
IQ
20Hz to 100kHz, IOUT=30mA~500mA.
---
320
320
400
900
0.78
160
30
---
µVRMS
µA
Quiescent Current
---
450
580
1200
0.95
---
VOUT<VFOLDBACK
VOUT>VFOLDBACK
260
650
0.6
---
Foldback Current Limit
ILIM
mA
Foldback Voltage
VFOLDBACK
TSD
V
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
°C
°C
ΔTSD
---
---
G9612A/B/D
G9612C
4.11
3.81
---
4.2
3.9
150
130
40
4.29
3.99
---
Reset Threshold
VTH-
V
G9612A/B/D
G9612C
Reset Threshold Hysteresis
VHYS
mV
---
---
Reset Threshold Tempco
CD Delay Pin Threshold Voltage
CD Pin Sink Current
---
---
ppm/°C
V
VTCD
ICD
VCC = 5V
3.5
3
3.9
4.3
200
11.5
0.7
4.3
---
VCC=1.5V, VCD=0.5V
mA
kΩ
CD Pin Pullup Resistance
RESET Output Current Low
RESET Function Operating Voltage
RD
100
8
400
---
V
CC=2.5V, V RESET =0.4V
IOL
mA
V
VOP
---
0.85
RESET sink current>10µA
Note 1: (VIN-VOUT) is limited to keep the product (IOUT x (VIN - VOUT)) from exceeding the package power dissipation limits.
Note 2: Dropout Voltage is (VIN - VOUT) when VOUT falls to 100mV below its nominal value at VIN = VOUT+1V. For example, the
G9612 is tested by measuring the VOUT at VIN = VOUT+1V, then VIN is lowered until VOUT falls 100mV below the meas-
ured value. The difference (VIN - VOUT) is then measured and defined as ΔVDO
.
Note 3: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.7
Apr 01, 2005
2
Global Mixed-mode Technology Inc.
G9612
Typical Performance Characteristics
(VIN=5V, CIN=COUT=10µF, CONT=VIN, TJ=25°C, unless otherwise noted)
Load transient
CONT Pin vs. Output
Load transient
Line Transient
Line Transient
Line Transient
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.7
Apr 01, 2005
3
Global Mixed-mode Technology Inc.
G9612
Typical Performance Characteristics (continued)
Over Current Response
Short Circuit Response
Power Supply Rejection Ratio
Power Supply Rejection Ratio
RL=22
CL=10µF
Ω
RL=100
Ω
CL=10µF
Power Supply Rejection Ratio
Power Supply Rejection Ratio
RL=6.6
Ω
CL=10µF
RL=11
Ω
CL=10µF
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.7
Apr 01, 2005
4
Global Mixed-mode Technology Inc.
G9612
Typical Performance Characteristics (continued)
Max. Power Dissipation vs.
PCB Top Copper Area
Max. Power Dissipation
vs. TAMB (still air)
TAMB = 25°C ; Still Air
( Different PCB Top Copper Area )
Unit:in2
3
2.5
2
3
2.5
2
A=0.5
A=1.0
A=1.5
A=2.0
A=2.5
A=3.0
A=3.5
A=4.0
A=4.5
A=5.0
1.5
1
1.5
1
0.5
0
0.5
0
25
45
65
85
0.5
1.5
2.5
3.5
4.5
PCB Top Copper Area (in2)
TAMB (°C)
Recommended Minimum Footprint
SOT-89-5
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.7
Apr 01, 2005
5
Global Mixed-mode Technology Inc.
G9612
Pin Description
PIN NO.
PIN NAME
VIN
PIN FUNCTION
Regulator Input. Supply voltage can range from 2.5V to 6V.
Ground
1
2
3
4
5
GND
VOUT
Regulator Output. Sources up to 500mA.
CD
External Programmable time delay is set by the capacitor connect to CD pin.
RESET Open-Drain Output remains low while VIN is below the reset threshold,
and for delay time set by CD after VIN rises above the reset threshold.
RESET
V
IN
－
MOSFET DRIVER
P
WITH FOLDBACK
CURRENT LIMIT
RESET
＋
VOUT
－
＋
RD
THERMAL
PROTECTION
1.24V
REFERENCE
CD
R1
R2
GND
Figure 1. Functional Diagram
The G9612 also offer reset function to detect the level
of VIN. They assert a reset signal whenever VIN supply
voltage declines below a preset threshold (VTH), keep-
ing it asserted for time delay set by capacitor con-
nected to CD pin, after VIN has resen above the high
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 cur-
rents up to 500mA. The reset function detect VIN. As
illustrated in Figure 1, they consist of a 1.24V refer-
ence, error amplifier, MOSFET driver, P-channel pass
transistor, and internal feedback voltage divider, reset
threshold comparator and time delay generator.
reset threshold (VTH + VHYS). 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.
The 1.24V bandgap reference is connected to the er-
ror amplifier’s inverting input. The error amplifier com-
pares 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 in-
creasing 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.
Additional blocks of linear regulator include a foldback
current limiter, reverse current protection, and thermal
sensor.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.7
Apr 01, 2005
6
Global Mixed-mode Technology Inc.
G9612
The worst-case thermal resistance from junction to
air (θJA) requirements are:
Foldback Current Limiting
The G9612 also include a foldback current limiter. It
monitors and controls the pass transistor’s gate volt-
age, 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.
(150°C -TA)
θJA
=
PD
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.
Thermal Overload Protection
Thermal overload protection limits total power dissipa-
tion in the G9612. When the junction temperature ex-
ceeds TJ = +160°C, the thermal sensor sends a signal
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 out-
put during thermal overload conditions.
CD Capacitor Selection
The reset timeout delay is set by internally pull-up RD
(typical value 200kΩ) and external CD.
When the voltage at CD pin exceeds the buffer thresh-
old, typically 0.8 VCC, the RESET output high. The
voltage detector and buffer have built-in hysterisis to
prevent erratic reset operation. For CD = 0.1µF, typical
reset time delay is 30ms. The formula of delay time is:
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 TJ = +160°C should not be exceeded.
T(ms) = 303 x CD(µF)
Operating Region and Power Dissipation
Regulator Output Capacitor Selection and Regu-
lator Stability
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 = IOUT (VIN-VOUT).
The resulting maximum power dissipation is:
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 tran-
sient 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.
(TJ-TA)
(θJC+θCA)
PMAX=
where (TJ -TA) is the temperature difference between
the G9612 die junction and the surrounding air, θJC is
the thermal resistance of the package chosen, and θCA
Transient Considerations
The Typical Operating Characteristics show 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 im-
pedance 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. In-
creasing the output capacitor’s value attenuates tran-
sient spikes.
is the thermal resistance through the printed circuit
board, copper traces and other materials to the sur-
rounding air. The thermal resistance of SOT89-5 with
0.18 inch2 copper heat sink isθJA = 125°C/W.
The power dissipation of G9612 is:
PD = (VIN - VOUT) x IOUT
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.7
Apr 01, 2005
7
Global Mixed-mode Technology Inc.
G9612
Package Information
A
C
D
F
E
L
B
I
K
H
J
G
DIMENSION IN MM
MIN.
DIMENSION IN INCH
MIN.
SYMBOL
MAX.
4.60
4.25
1.70
1.50
2.60
-----
MAX.
0.181
0.167
0.067
0.059
0.102
-----
A
B
C
D
E
F
G
H
I
4.40
4.05
1.50
1.30
2.40
0.80
0.173
0.159
0.059
0.051
0.094
0.031
3.00 REF
1.50 REF
0.118 REF
0.059 REF
0.40
1.40
0.35
0.52
1.60
0.41
0.016
0.055
0.014
0.020
0.063
0.016
J
K
L
5º TYP
5º TYP
Taping Specification
PACKAGE
SOT-89-5
Q’TY/REEL
1,000 ea
Feed Direction
SOT 89-5 Package Orientation
GMT Inc. does 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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.7
Apr 01, 2005
8
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