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G9612のメーカーはGMTです、この部品の機能は「Linear Regulator」です。 |
部品番号 | G9612 |
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部品説明 | Linear Regulator | ||
メーカ | GMT | ||
ロゴ | |||
このページの下部にプレビューとG9612ダウンロード(pdfファイル)リンクがあります。 Total 8 pages
www.DataSheet4U.com
Global Mixed-mode Technology Inc.
G9612
Low-Dropout, 500mA Linear Regulator with Reset
Features
500mA Output Current, with Foldback Current
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
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 89-5L 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.
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.
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.
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
MARKING
REGULATOR
OUTPUT VOLTAGE
RESET THRESHOLD
VOLTAGE
TEMP.
RANGE
PACKAGE
G9612ATEU
G9612ATEUf
9612AX
3.4
4.2 -40°C to +85°C SOT-89-5
G9612BTEU
G9612BTEUf
9612BX
3.3
4.2 -40°C to +85°C SOT-89-5
G9612CTEU G9612CTEUf
9612CX
3.3
3.9 -40°C to +85°C SOT-89-5
G9612DTEU G9612DTEUf
9612DX
2.5
4.2 -40°C to +85°C SOT-89-5
Pin Configuration
Typical Operation Circuit
G9612
RESET
5
CD
4
1 23
VIN GND VOUT
SOT-89-5
VCC
VIN
1µF
RESET
G9612
CD VOUT
GND
Rpull-high
10kΩ
OUTPUT
VOLTAGE
10µF
(Tantalum or Aluminum)
Ver: 1.7
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
1
1 Page Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN=5V, CIN=COUT=10µF, CONT=VIN, TJ=25°C, unless otherwise noted)
G9612
CONT Pin vs. Output
Load transient
Load transient
Line Transient
Line Transient
Line Transient
Ver: 1.7
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
3
3Pages Global Mixed-mode Technology Inc.
Pin Description
G9612
PIN NO.
1
2
3
4
5
PIN NAME
VIN
GND
VOUT
CD
RESET
PIN FUNCTION
Regulator Input. Supply voltage can range from 2.5V to 6V.
Ground
Regulator Output. Sources up to 500mA.
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.
-
+
THERMAL
PROTECTION
1.24V
REFERENCE
VIN
MOSFET DRIVER
WITH FOLDBACK
CURRENT LIMIT
P
VOUT
GND
R1
R2
-
+
RESET
RD
CD
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 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.
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.
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
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.
Ver: 1.7
Apr 01, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
6
6 Page | |||
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