G958T24U [GMT]
800mA Adjustable Low-Dropout Linear Regulator; 800毫安可调低压差线性稳压器
| 型号： | G958T24U |
| 厂家： | 
GLOBAL MIXED-MODE TECHNOLOGY INC |
| 描述： | 800mA Adjustable Low-Dropout Linear Regulator |
| 文件： | 总7页 (文件大小：149K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Global Mixed-mode Technology Inc.
G958
800mA Adjustable Low-Dropout Linear Regulator
Features
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.
Available in Adjust Version
Space Saving SOT-89 Package
Internal Short Circuit Current Limiting
Internal Over Temperature Protection
Current limit in Excess of 800mA
The G958 provides over temperature and over
current protection circuits to prevent it from being
damaged by abnormal operating conditions.
Applications
Post Regulation for Switching DC/DC Con-
verter
The G958 is available in SOT-89 packages. A
minimum of 10µF tantalum electrolytic capacitor is
required at the output to improve the transient
response and stability.
Voltage Regulator for CD-ROM Driver
Voltage Regulator for LAN Card
Battery Powered Instrumentation
Motherboard
Ordering Information
ORDER
MARKING
NUMBER
TEMP.
RANGE
PACKAGE
(Pb free)
PIN OPTION
2
1
3
958
G958T23U
-40°C~85°C
-40°C~85°C
SOT-89
SOT-89
GND/ADJ
VOUT
VIN
VIN
3xx
958
G958T24U
GND/ADJ
VOUT
4xx
* 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
2
PACKING
U: Tape & Reel
1
3
3: GND/ADJ VOUT
4: GND/ADJ VIN
VIN
VOUT
Package Type
Typical Application Circuit
[Note 4]: Type of COUT
IO
VOUT
VIN
VIN
G958
VOUT
Top View
GND/ADJ
COUT
10µF
C1
1µF
R1
R2
2
1
3
SOT-89
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
1
Global Mixed-mode Technology Inc.
G958
Absolute Maximum Ratings
(Note 1)
Operating Conditions
(Note 1)
(VIN-VADJ) Voltage . . . . . . . . . . . . . . . . . . . . . 2.5V~6.5V
Temperature Range . . . . . . . . . . . .-40°C ≤ TA ≤85°C
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Power Dissipation Internally Limited
(Note 2)
Maximum Junction Temperature. . . . . . . . . . . . . . 150°C
Reflow Temperature (soldering, 10sec) . . . . . . . 260°C
Thermal Resistance Junction to Ambient, (θJA)
SOT-89 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126°C/W
Thermal Resistance Junction to Case, (θJC)
SOT-89 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29°C/W
Electrical Characteristics
Operating Conditions: VIN ≤ 6.5V, TJ = 25°C unless otherwise specified. [Note3]
PARAMETER
Reference Voltage
CONDITIONS
VIN - VOUT = 2V, IOUT = 10mA
MIN
1.225
---
TYP
1.250
1.32
0.04
1.2
MAX UNITS
1.275
---
V
%
Line Regulation
(VOUT + 1.5V) < VIN < 6.5V, IOUT = 10mA
(VIN - VOUT) = 2V, 10mA < IOUT < 0.5A
ΔVOUT = 2%, IOUT = 0.5A
Load Regulation
---
---
%
Dropout Voltage
---
1.3
---
V
Current Limit
(VIN - VOUT) = 2V
800
---
1200
0.15
---
mA
µA
mA
µA
Adjust Pin Current Change
Minimum Load Current
Quiescent Current
VIN - VOUT = 2V, 10mA < IOUT < 0.5A
1.5V < (VIN - VOUT) < 5.25V
VIN - VOUT = 2V
---
10
---
---
80
---
f = 120Hz, COUT = 10µF Tantalum,
(VIN - VOUT) = 3V, IOUT = 100mA
TA = 25°C, 30ms pulse
Ripple Rejection
---
50
---
dB
Thermal Regulation
---
---
---
0.004
0.3
0.02
---
%/W
%
Temperature Stability
VIN = 4V, IO =10mA
RMS Output Noise (% of VOUT
)
TA = 25°C, 10Hz < f < 10kHz, ILOAD = 10mA
0.007
---
%
Thermal Resistor Junction-to-Ambient
(No heat sink; No air flow)
Thermal Shutdown
SOT-89; Recommended Minimum Footprint
Junction Temperature
---
180
---
°C/W
---
---
150
10
---
---
°C
°C
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, θJA,
and ambient temperature TA. The maximum allowable power dissipation at any ambient temperature is Tjmax-TA / θJA. If
this dissipation is exceeded, the die temperature will rise above 150°C and IC will go into thermal shutdown. For the
G958 in SOT-89 package; θJA is 126°C/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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
2
Global Mixed-mode Technology Inc.
G958
Definitions
Output Voltage
voltage. The measurement is made under conditions
of low dissipation or by using pulse techniques such
that average chip temperature is not significantly af-
fected.
The G958 provides an adjustable output voltage from
1.25V to 5V. With two external resistors. It can be for-
mulated as:
R2
Load Regulation
VOUT = 1.25V x (1+
) + IADJ x R2
The change in output voltage for a change in load
current at constant chip temperature. The measure-
ment is made under conditions of low dissipation or by
using pulse techniques such that average chip tem-
perature is not significantly affected.
R1
IADJ = 80µA (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 cur-
rent and minimum input supply requirements.
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.
Line Regulation
The change in output voltage for a change in input
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
3
Global Mixed-mode Technology Inc.
G958
Typical Performance Characteristics
VIN= 4V, CIN=10µF, COUT=10µF, TA=25°C, unless otherwise noted.
Line transient
Load Transient
Dropout Voltage vs. Load Current
IAD J Current vs. Load Current
1.06
1.04
94
91
85 C
°
1.02
1
85 C
°
88
85
82
79
76
73
70
25 C
°
25 C
°
0.98
0.96
0.94
0.92
0.9
-45 C
°
-45 C
°
0
100 200 300 400 500 600 700 800
Load Current(mA)
0
200
400
600
800
1000
Output Current (mA)
Temperature Stability
Ripple Rejection
1
0.5
0
60
50
40
30
20
10
0
IOUT = 100mA
(VIN - VOUT) > 3V
IOUT = 800mA
-0.5
COUT = 10 F
µ
IOUT = 0.1A~0.8A
-1
-40
-20
0
20
40
60
80
100
10
100
1000
Frequency (Hz)
10000
100000
Temperature ( C)
°
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
4
Global Mixed-mode Technology Inc.
G958
Typical Performance Characteristics (continued)
Output Noise
Short-Circuit Current
1.60
1.50
1.40
1.30
1.20
1.10
1.00
0.90
0.80
VIN = 4.5V
IOUT = 10mA
115 C
°
25 C
°
-45 C
°
1.25 1.75 2.25 2.75 3.25 3.75 4.25 4.75 5.25
(VIN-VOUT ) Diffrential (V)
Load Regulation
Overcurrent Protection Characteristics
0.15
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
SOT-89 Max. Power Dissipation vs. TAMB
Unit:in2
A=0.1
3
3
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
A=5.0
2.5
2.5
2
2
1.5
1
1.5
1
0.5
0
0.5
0
0.5
1.5
2.5
3.5
4.5
25
35
45
55
65
75
85
PCB Top Copper Area (in2)
TAMB ( C)
°
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
5
Global Mixed-mode Technology Inc.
G958
Recommend Minimum Footprint
SOT-89
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
6
Global Mixed-mode Technology Inc.
G958
Package Information
D
D1
POLISH
E
HE
A1
e
C
MATTE FINISH
A
b
b1
POLISH
b
SOT-89 (T2) Package
DIMENSIONS IN INCH
DIMENSIONS IN MILLIMETER
SYMBOL
MIN
1.40
0.80
0.36
0.41
038
NOM
1.50
1.04
0.42
0.47
0.40
4.50
1.60
-----
MAX
1.60
-----
MIN
0.055
0.031
0.014
0.016
0.014
0.173
0.055
-----
NOM
0.059
0.041
0.016
0.018
0.015
0.177
0.062
-----
MAX
0.063
-----
A
A1
b
0.48
0.53
0.43
4.60
1.75
4.25
2.60
3.10
0.018
0.020
0.017
0.181
0.069
0.167
0.102
0.122
b1
C
D
4.40
1.40
-----
D1
HE
E
2.40
2.90
2.50
3.00
0.094
0.114
0.098
0.118
e
Package Specification
PACKAGE
Q’TY/REEL
1,000 ea
SOT-89
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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
7
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