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Global Mixed-mode Technology Inc.
2.5V 500mA Low Dropout Regulator
Features
Dropout voltage typically 0.45V @ IO = 500mA Output current in 500mA Output voltage accuracy +2% Quiescent current, typically 0.6mA Internal short circuit current limit Internal over temperature protection
G905
General Description
The G905 positive 2.5V voltage regulator features the ability to source 500mA of output current with a dropout voltage of typically 0.45V. A low quiescent current is provided. The typical quiescent current is 0.6mA. Familiar regulator features such as over temperature and over current protection circuits are provided to prevent it from being damaged by abnormal operating conditions.
Application
CD-R/W DVD-ROM DVD player LAN Switch Broadband access
Ordering Information
ORDER NUMBER
G905T24U
PACKAGE TYPE
SOT 89
1
GND
PIN OPTION 2
VIN
3
VOUT
Order Number Identification
GXXX XX X X Packing Type Pin Option Package Type Part Number PACKAGE TYPE
T2 : SOT 89 1 4 : GND
PIN OPTION
2 VIN 3 VOUT
PACKING
U & D : Tape & Reel Direction
Typical Application
[Note 4] : Type of COUT
Package Type
IO VIN C1 1F
G905
IQ
VOUT COUT 10F
Top View
1
2
3
SOT 89
Ver: 1.1 Jan 31, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
(Note 1) Absolute Maximum Ratings Input Voltage...................................................7V Power Dissipation Internally Limited................(Note2) Maximum Junction Temperature.....................150C Storage Temperature Range........-65C TJ +150C Lead Temperature, Time for Wave Soldering SOT-89 Package...................................260C, 10s Continuous Power Dissipation (TA=+25C) SOT-89 (1)....................................................0.5W
Note (1): See Recommended Minimum Footprint
Operating Conditions
G905
(Note 1) Input Voltage.........................................2.7V ~ 6V Temperature Range........................0C TJ 125C
Electrical Characteristics
VIN =5V, IO = 500mA, CIN=1F, COUT =10F. All specifications apply for TA = TJ = 25C. [Note 3] PARAMETER
Output Voltage Line Regulation Load Regulation Output Impedance Quiescent Current Ripple Rejection Dropout Voltage Output Current Short Circuit Current Over Temperature
CONDITIONS
10mA < IO <500mA 3.3V < VIN <6.5V, IO = 10mA 10mA < IO < 500mA 200mA DC and 100mA AC, fO = 120Hz VIN = 5V fi = 120Hz, Vripple=2VP-P, Io = 100mA IO = 500mA IO = 100mA Continuous Test, VIN = 3.3V TA = 25C, TJ < 125C, VOUT within 2% (Note 3) Minimum footprint
MIN
2.45
TYP
2.5 1 20 80 0.6 46 450 220 500 0.77 150
MAX
2.55 50 60
UNITS
V mV mV m mA dB mV mA A C
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions are conditions under which the device functions but the specifications might not be guaranteed. For guaranteed specifications and test conditions see the Electrical Characteristics. Note2: The maximum power dissipation is a function of the maximum junction temperature, TJmax ; total thermal resistance, JA, and ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is Tjmax-TA / JA. If this dissipation is exceeded, the die temperature will rise above 150C and IC will go into thermal shutdown. For the G905 in SOT-89 (T2) package, JA is 250C/W (See recommend minimum footprint). The safe operation in SOT-89 package, it can see "Typical Performance Characteristics" (Safe Operating Area). Note3: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Note4: The type of output capacitor should be tantalum or aluminum.
Definitions
Dropout Voltage The input/output Voltage differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 100mV below its nominal value, dropout voltage is affected by junction temperature, load current and minimum input supply requirements. Line Regulation The change in output voltage for a change in input voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that average chip temperature is not significantly affected.
Ver: 1.1 Jan 31, 2002
Load Regulation The change in output voltage for a change in load current at constant chip temperature. The measurement is made under conditions of low dissipation or by using pulse techniques such that average chip temperature is not significantly affected. Maximum Power Dissipation The maximum total device dissipation for which the regulator will operate within specifications. Quiescent Bias Current Current which is used to operate the regulator chip and is not delivered to the load.
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN= +5V, CIN=1F, COUT=10F, TA=25C, unless otherwise noted.)
G905
Load Transient
Line Transient
Ch1: Vin (offset=5.0V) Ch2: Vout (offset=2.50V) CIN = 1F Iout=100mA
Ch1: Iout (400mA/div) Ch2: Vout is AC coupled
Output Voltage vs. Load Current
2.630 2.610 2.590 2.570 2.550 2.530 2.510 2.490 2.470 2.450 0 50 100 150 200 250 300 350 400 450 500 700 600
Dropout Voltage vs. Load Current
Dropout Voltage (mV)
Ootput Voltage (V)
500 400 300 200 100 0 0 50 100 150 200 250 300 350 400 450 500
Load Current (mA) Ground Current vs. Load Current
2.00 1.80 1.60
Load Current (mA)
Ground Current (mA)
1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 0 50 100 150 200 250 300 350 400 450 500
Load Current (mA)
Ver: 1.1 Jan 31, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
3
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN= +3.3V, CIN=1F, COUT=10F, TA=25C, unless otherwise noted.)
G905
Load Transient
Line Transient
Ch1: Vin (offset=3.3V) Ch2: Vout (offset=2.50V) CIN = 1F Iout=100mA
Ch1: Iout (400mA/div) Ch2: Vout is AC coupled
Output Voltage vs. Load Current
2.590 2.570
Dropout Voltage vs. Load Current
500 450 400
2.550
Dropout Voltage (mV)
Ootput Voltage (V)
350 300 250 200 150 100 50 0
2.530
2.510
2.490
2.470
2.450 0 50 100 150 200 250 300 350 400 450 500
0
50
100
150
200
250
300
350
400
450
500
Load Current (mA)
Load Current (mA)
Ground Current vs. Load Current
2.00 1.80 1.60
Ground Current (mA)
1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 0 50 100 150 200 250 300 350 400 450 500
Load Current (mA)
Ver: 1.1 Jan 31, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
4
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
(VIN= +5V, CIN=1F, COUT=10F, TA=25C, unless otherwise noted.)
G905
Safe Operating of SOT-89
600
Maximum recommended output current
Maximum Power Dissipation of SOT-89
0.7 0.6
Power Dissipation (W)
500
T A=25C,Still Air
Output Current (mA)
400
TA=25
0.5 0.4 0.3 0.2 0.1 0.0
25 35
300 200 100 0
0.0
TA=55 TA=85
1oz Copper on SOT-89 Package 1Mounted on recommended mimimum footprint (RJA =250C/W)
0.3 0.5 0.8 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5
Still Air 1oz Copper on SOT-89 Package Mount on recommend footprint (RJA=250C/W)
Input-Output Voltage Differential VIN-VOUT (V)
Amibent Temperature T A ()
45
55
65
75
85
95
105
115
125
Recommend Minimum Footprint
Ver: 1.1 Jan 31, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Package Information
D D1
G905
POLISH
E
HE
A1 e C
MATTE FINISH
A
b
b1
b
POLISH
SOT- 89 (T2) Package
SYMBOLS
A A1 b b1 C D D1 HE E e
DIMENSIONS IN MILLIMETERS MIN NOM MAX
1.40 0.80 0.36 0.41 038 4.40 1.40 ----2.40 2.90 1.50 1.04 0.42 0.47 0.40 4.50 1.60 ----2.50 3.00 1.60 ----0.48 0.53 0.43 4.60 1.75 4.25 2.60 3.10
MIN
0.055 0.031 0.014 0.016 0.014 0.173 0.055 ----0.094 0.114
DIMENSIONS IN INCHES NOM MAX
0.059 0.041 0.016 0.018 0.015 0.177 0.062 ----0.098 0.118 0.063 ----0.048 0.020 0.017 0.181 0.069 0.167 0.102 0.122
Package Orientation
Feed Direction SOT 89 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.
Ver: 1.1 Jan 31, 2002
TEL: 886-3-5788833 http://www.gmt.com.tw
6

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