GMT G958 800ma adjustable low-dropout linear regulator Datasheet

G958
Global Mixed-mode Technology Inc.
800mA Adjustable Low-Dropout Linear Regulator
Features
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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 Converter
„
„
„
„
Voltage Regulator for CD-ROM Driver
Voltage Regulator for LAN Card
Battery Powered Instrumentation
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.
Motherboard
Ordering Information
ORDER
NUMBER
958
3xx
958
4xx
G958T23U
G958T24U
RANGE
PACKAGE
(Pb free)
-40°C~85°C
-40°C~85°C
TEMP.
MARKING
1
PIN OPTION
2
3
SOT-89
GND/ADJ
VOUT
VIN
SOT-89
GND/ADJ
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
PIN OPTION
1
3: GND/ADJ
4: GND/ADJ
T2: SOT-89
2
VOUT
VIN
PACKING
3
VIN
VOUT
Package Type
U: Tape & Reel
Typical Application Circuit
[Note 4]: Type of COUT
IO
VIN
VIN
Top View
2
VOUT
VOUT
GND/ADJ
C1
1µF
1
G958
R1
COUT
10µF
R2
3
SOT-89
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
1
G958
Global Mixed-mode Technology Inc.
Absolute Maximum Ratings
(Note 1)
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
Operating Conditions
(Note 1)
(VIN-VADJ) Voltage . . . . . . . . . . . . . . . . . . . . . 2.5V~6.5V
Temperature Range . . . . . . . . . . . .-40°C ≤ TA ≤85°C
Electrical Characteristics
Operating Conditions: VIN ≤ 6.5V, TJ = 25°C unless otherwise specified. [Note3]
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
1.225
-------
1.250
1.32
0.04
1.2
1.275
----1.3
V
%
%
V
(VIN - VOUT) = 2V
800
1200
---
mA
VIN - VOUT = 2V, 10mA < IOUT < 0.5A
1.5V < (VIN - VOUT) < 5.25V
--10
0.15
---
-----
µA
mA
---
80
---
µA
Reference Voltage
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
VIN - VOUT = 2V, IOUT = 10mA
(VOUT + 1.5V) < VIN < 6.5V, IOUT = 10mA
(VIN - VOUT) = 2V, 10mA < IOUT < 0.5A
ΔVOUT = 2%, IOUT = 0.5A
Adjust Pin Current Change
Minimum Load Current
Quiescent Current
VIN - VOUT = 2V
---
50
---
dB
Thermal Regulation
f = 120Hz, COUT = 10µF Tantalum,
(VIN - VOUT) = 3V, IOUT = 100mA
TA = 25°C, 30ms pulse
---
0.004
0.02
%/W
Temperature Stability
RMS Output Noise (% of VOUT)
VIN = 4V, IO =10mA
TA = 25°C, 10Hz < f < 10kHz, ILOAD = 10mA
-----
0.3
0.007
-----
%
%
---
180
---
°C/W
---
150
---
°C
---
10
---
°C
Ripple Rejection
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, 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
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+
R2
R1
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.
) + IADJ x R2
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 current 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
G958
Global Mixed-mode Technology Inc.
Typical Performance Characteristics
VIN= 4V, CIN=10µF, COUT=10µF, TA=25°C, unless otherwise noted.
Line transient
Load Transient
Dropout Voltage vs. Load Current
IADJ Current vs. Load Current
1.06
94
85°C
91
85°C
1.02
1
IADJ Current(mA)
Dropout Voutput (V)
1.04
25°C
0.98
0.96
0.94
88
25°C
85
82
79
-45°C
76
-45°C
73
0.92
70
0.9
0
200
400
600
Output Current (mA)
800
0
1000
100
200
300
400
500
600
700
800
Load Current(mA)
Temperature Stability
Ripple Rejection
1
60
IOUT = 100mA
(V IN - V OUT ) > 3V
Output Voltage Change
Ripple Rejection (dB)
50
40
IOUT = 800mA
30
20
COUT = 10µF
IOUT = 0.1A~0.8A
10
100
1000
10000
Frequency (Hz)
0
-0.5
-1
-40
0
10
0.5
100000
-20
0
20
40
60
80
100
Temperature (°C)
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
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G958
Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
Output Noise
Short-Circuit Current
1.60
1.50
Short-Circuit current (A)
V IN = 4.5V
IOUT = 10mA
115°C
1.40
1.30
25°C
1.20
1.10
-45°C
1.00
0.90
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
Overcurrent Protection Characteristics
Output Voltage Deviation (%)
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
3
3
2.5
2.5
Unit:in2
Max. Dissipation Power (W)
Max.
(W)
Max.Dissipation
Dissipation Power
Power (W)
A=0.1
2
1.5
1
0.5
A=0.2
A=0.3
A=0.4
2
A=0.5
A=1.0
A=1.5
1.5
A=2.0
A=2.5
1
A=3.0
A=3.5
A=4.0
0.5
A=4.5
A=5.0
0
0
0.5
0
11.5
22.5
3 3.5
4 4.5
5
25
PCB Top Copper Area (in22)
PCB Top Copper Area (in )
35
45
55
65
75
85
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
G958
Global Mixed-mode Technology Inc.
Package Information
D
D1
POLISH
E
HE
A1
e
C
MATTE FINISH
A
b
b
b1
POLISH
SOT-89 (T2) Package
SYMBOL
MIN
DIMENSIONS IN MILLIMETER
NOM
MAX
DIMENSIONS IN INCH
MIN
NOM
MAX
A
1.40
1.50
1.60
0.055
0.059
0.063
A1
b
0.80
0.36
1.04
0.42
----0.48
0.031
0.014
0.041
0.016
----0.018
b1
C
0.41
038
0.47
0.40
0.53
0.43
0.016
0.014
0.018
0.015
0.020
0.017
D
D1
4.40
1.40
4.50
1.60
4.60
1.75
0.173
0.055
0.177
0.062
0.181
0.069
HE
-----
-----
4.25
-----
-----
0.167
E
e
2.40
2.90
2.50
3.00
2.60
3.10
0.094
0.114
0.098
0.118
0.102
0.122
Package Specification
PACKAGE
Q’TY/REEL
SOT-89
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.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Apr 18, 2006
7
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