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Global Mixed-mode Technology Inc.
G958
800mA Adjustable Low-Dropout Linear Regulator
Features
Available in Adjust Version Space Saving SOT-89 Package Internal Short Circuit Current Limiting Internal Over Temperature Protection Current limit in Excess of 800mA
General Description
The G958 is a low dropout linear regulator with a dropout of 1.2V at 500mA of load current. It is available in an adjustable version, which can set the output from 1.25V to 5V with only two external resistors. The G958 provides over temperature and over current protection circuits to prevent it from being damaged by abnormal operating conditions. The G958 is available in SOT-89 packages. A minimum of 10F tantalum electrolytic capacitor is required at the output to improve the transient response and stability.
Applications
Post Regulation for Switching DC/DC Converter
Voltage Regulator for CD-ROM Driver Voltage Regulator for LAN Card Battery Powered Instrumentation
Motherboard
Ordering Information
ORDER NUMBER
G958T23U G958T24U
MARKING
958 3xx 958 4xx
TEMP.
RANGE
-40C~85C -40C~85C
PACKAGE (Pb free)
SOT-89 SOT-89
1
GND/ADJ GND/ADJ
PIN OPTION 2
VOUT VIN
3
VIN VOUT
* For other package types and pin options, please contact us at sales @gmt.com.tw
Order Number Identification
GXXX XX X X Packing Type Pin Option Package Type Part Number PACKAGE TYPE
T2: SOT-89
PIN OPTION
1 3: GND/ADJ 4: GND/ADJ 2 VOUT VIN 3 VIN VOUT
PACKING
U: Tape & Reel
Package Type
Typical Application Circuit
[Note 4]: Type of COUT
IO VIN VIN
G958
GND/ADJ
VOUT
VOUT
Top View
C1 1F
R1 R2
COUT 10F
1
2
3
SOT-89
Ver: 1.1 Apr 18, 2006 TEL: 886-3-5788833 http://www.gmt.com.tw
1
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings (Note 1) Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Power Dissipation Internally Limited (Note 2) Maximum Junction Temperature. . . . . . . . . . . . . . 150C Reflow Temperature (soldering, 10sec) . . . . . . . 260C Thermal Resistance Junction to Ambient, (JA) SOT-89 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126C/W Thermal Resistance Junction to Case, (JC) SOT-89 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29C/W Electrical Characteristics
Operating Conditions: VIN 6.5V, TJ = 25C unless otherwise specified. [Note3] PARAMETER
Reference Voltage Line Regulation Load Regulation Dropout Voltage Current Limit Adjust Pin Current Change Minimum Load Current Quiescent Current Ripple Rejection Thermal Regulation Temperature Stability RMS Output Noise (% of VOUT)
G958
Operating Conditions
(Note 1) (VIN-VADJ) Voltage . . . . . . . . . . . . . . . . . . . . . 2.5V~6.5V Temperature Range . . . . . . . . . . . .-40C TA 85C
CONDITIONS
VIN - VOUT = 2V, IOUT = 10mA (VOUT + 1.5V) < VIN < 6.5V, IOUT = 10mA (VIN - VOUT) = 2V, 10mA < IOUT < 0.5A VOUT = 2%, IOUT = 0.5A (VIN - VOUT) = 2V VIN - VOUT = 2V, 10mA < IOUT < 0.5A 1.5V < (VIN - VOUT) < 5.25V VIN - VOUT = 2V f = 120Hz, COUT = 10F Tantalum, (VIN - VOUT) = 3V, IOUT = 100mA TA = 25C, 30ms pulse VIN = 4V, IO =10mA TA = 25C, 10Hz < f < 10kHz, ILOAD = 10mA
MIN
1.225 ------800 --10 -----------------
TYP
1.250 1.32 0.04 1.2 1200 0.15 --80 50 0.004 0.3 0.007 180 150 10
MAX
1.275 ----1.3 ----------0.02 -----------
UNITS
V % % V mA A mA A dB %/W % % C/W C C
Thermal Resistor Junction-to-Ambient SOT-89; Recommended Minimum Footprint (No heat sink; No air flow) Thermal Shutdown Junction Temperature Thermal Shutdown Hysteresis
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 G958 in SOT-89 package; JA is 126C/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.
Ver: 1.1 Apr 18, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
2
Global Mixed-mode Technology Inc.
Definitions
Output Voltage The G958 provides an adjustable output voltage from 1.25V to 5V. With two external resistors. It can be formulated as: VOUT = 1.25V x (1+ IADJ = 80A (TYP) 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 2% 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 R2 R1
G958
voltage. The measurement is made under conditions of low dissipation or by using pulse techniques such that average chip temperature is not significantly affected. 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.
) + IADJ x R2
Ver: 1.1 Apr 18, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics
VIN= 4V, CIN=10F, COUT=10F, TA=25C, unless otherwise noted.
Line transient Load Transient
G958
Dropout Voltage vs. Load Current
1.06 1.04 Dropout Voutput (V) 1.02 1 0.98 0.96 0.94 0.92 0.9 0 200 400 600 Output Current (mA) 800 1000 -45C 85C IADJ Current(mA) 25C 94 91 88 85 82 79 76 73 70 0
IADJ Current vs. Load Current
85C
25C
-45C
100
200
300
400
500
600
700
800
Load Current(mA)
Ripple Rejection
60 IOUT = 100mA 50
Ripple Rejection (dB)
Output Voltage Change
Temperature Stability
1
(V IN - V OUT ) > 3V 40 IOUT = 800mA 30 20 10 0 10 100 1000 10000 Frequency (Hz) 100000 COUT = 10F IOUT = 0.1A~0.8A
0.5
0
-0.5
-1 -40
-20
0
20
40
60
80
100
Temperature (C)
Ver: 1.1 Apr 18, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Output Noise
1.60 V IN = 4.5V IOUT = 10mA 1.50 Short-Circuit current (A) 1.40 1.30 1.20 1.10 1.00 0.90 25C -45C 115C
G958
Short-Circuit Current
0.80 1.25 1.75 2.25 2.75 3.25 3.75 4.25 4.75 5.25 (V IN-V OUT ) Diffrential (V)
Load Regulation
0.15
Output Voltage Deviation (%)
Overcurrent Protection Characteristics
0.1
0.05
0
-0.05
-0.1 -40 -25 -10
5
20
35
50
65
80
95 110
Temperature( C)
SOT-89 Max. Power Dissipation vs. PCB Top Copper Area
3 Max. Dissipation Power (W) Max. Dissipation Power (W) 2.5
Max. Dissipation Power (W)
SOT-89 Max. Power Dissipation vs. TAMB
3 2.5 2 1.5 1 0.5 0
Unit:in2 A=0.1 A=0.2 A=0.3 A=0.4 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
2 1.5 1 0.5 0 0.5 0 1 1.5 22.5 3 3.5 4 4.5 5 PCB Top Copper Area (in2) PCB Top Copper Area (in2)
A=5.0
25
35
45
55
65
75
85
TAMB ( C)
Ver: 1.1 Apr 18, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
5
Global Mixed-mode Technology Inc.
Recommend Minimum Footprint
SOT-89
G958
Ver: 1.1 Apr 18, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
6
Global Mixed-mode Technology Inc.
Package Information
D D1
G958
POLISH
E HE A1 e C
MATTE FINISH
A
b
b1
b
POLISH
SOT-89 (T2) Package
SYMBOL
A A1 b b1 C D D1 HE E e
MIN
1.40 0.80 0.36 0.41 038 4.40 1.40 ----2.40 2.90
DIMENSIONS IN MILLIMETER NOM MAX
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
DIMENSIONS IN INCH MIN
0.055 0.031 0.014 0.016 0.014 0.173 0.055 ----0.094 0.114
NOM
0.059 0.041 0.016 0.018 0.015 0.177 0.062 ----0.098 0.118
MAX
0.063 ----0.018 0.020 0.017 0.181 0.069 0.167 0.102 0.122
Package Specification
PACKAGE
SOT-89
Q'TY/REEL
1,000 ea
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 Apr 18, 2006
TEL: 886-3-5788833 http://www.gmt.com.tw
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