G923-315T1U [CRANE]
300mA High PSRR LDO Regulators; 300毫安高PSRR LDO稳压器
| 型号： | G923-315T1U |
| 厂家： | 
Crane Aerospace & Electronics. |
| 描述： | 300mA High PSRR LDO Regulators |
| 文件： | 总9页 (文件大小：383K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Global Mixed-mode Technology Inc.
G923
300mA High PSRR LDO Regulators
Features
General Description
Low, 90µA No-Load Supply Current
The G923 is a low supply current, high PSRR, and low
dropout linear regulator that comes in a space saving
SOT-23-5 package. The supply current at no-load is
90µA. In the shutdown mode, the maximum supply
current is less than 1µA. Operating voltage range of
the G923 is from 2.50V to 5.50V. The over-current
protection limit is set at 550mA typical. An over- tem-
perature protection circuit is built-in in the G923 to
prevent thermal overload. These power saving fea-
tures make the G923 ideal for use in the bat-
tery-powered applications such as notebook com-
puters, cellular phones, and PDA’s.
Guaranteed 300mA Output Current
Dropout Voltage is 200mV @ 150mA Load
PSRR=65dB @ 120Hz
Over-Temperature Protection and Short-Circuit
Protection
Two Modes of Operation ----
Fixed Mode: 1.50V~5.00V
Adjustable Mode: from 1.25V to 5.50V
Max. Supply Current in Shutdown Mode < 1µA
Low Output Noise at 224µVRMS
Stable with low cost ceramic capacitors
The G923 has two modes of operation. When the SET
pin is connected to ground, its output is a pre-set value:
1.50V~5.00V. There is no external component needed
to decide the output voltage. When an output other
than the preset value is needed, two external resistors
should be used as a voltage divider. The output volt-
age is then decided by the resistor ratio. The G923
comes in a space saving SOT-23-5 package.
Applications
Notebook Computers
Cellular Phones
PDAs
Digital still Camera and Video Recorders
Hand-Held Devices
Audio Codec
Pin Configuration
OUTPUT
VOLTAGE
IN
OUT
SET
G923
＋
COUT
CIN
_ 1µF
SHDN
1µF
BATTERY
GND
1
5
SHDN
SET
Fixed mode
2
3
GND
IN
G923
OUTPUT
VOLTAGE
OUT
IN
4
OUT
R1
＋
－
G923
SOT-23-5
SET
CIN
1µF
SHDN
BATTERY
COUT
1µF
R2
GND
Adjustable mode
TEL: 886-3-5788833
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Ver: 1.1
Jan 19, 2006
1
Global Mixed-mode Technology Inc.
Ordering Information
G923
ORDER
NUMBER
ORDER NUMBER
(Pb free)
MARKING
VOLTAGE
TEMP. RANGE
PACKAGE
G923-330T1Uf
G923-330T1U
92AUx
3.30V
-40°C~ +85°C
SOT-23-5
For other output voltage, please contact us at sales@gmt.com.tw
Note: T1: SOT-23-5
U: Tape & Reel
Selector Guide
ORDER
NUMBER
ORDER NUMBER
(Pb free)
OUTPUT
MARKING
VOLTAGE (V)
1.50
1.60
1.70
1.80
1.90
2.00
2.10
2.20
2.30
2.40
2.50
2.60
2.70
2.80
2.85
2.90
3.00
3.10
3.15
3.20
3.30
3.40
3.50
3.60
3.70
3.80
3.90
4.00
4.10
4.20
4.30
4.40
4.50
4.60
4.70
4.75
4.80
4.90
5.00
G923-150T1U
G923-160T1U
G923-170T1U
G923-180T1U
G923-190T1U
G923-200T1U
G923-210T1U
G923-220T1U
G923-230T1U
G923-240T1U
G923-250T1U
G923-260T1U
G923-270T1U
G923-280T1U
G923-285T1U
G923-290T1U
G923-300T1U
G923-310T1U
G923-315T1U
G923-320T1U
G923-330T1U
G923-340T1U
G923-350T1U
G923-360T1U
G923-370T1U
G923-380T1U
G923-390T1U
G923-400T1U
G923-410T1U
G923-420T1U
G923-430T1U
G923-440T1U
G923-450T1U
G923-460T1U
G923-470T1U
G923-475T1U
G923-480T1U
G923-490T1U
G923-500T1U
G923-150T1Uf
G923-160T1Uf
G923-170T1Uf
G923-180T1Uf
G923-190T1Uf
G923-200T1Uf
G923-210T1Uf
G923-220T1Uf
G923-230T1Uf
G923-240T1Uf
G923-250T1Uf
G923-260T1Uf
G923-270T1Uf
G923-280T1Uf
G923-285T1Uf
G923-290T1Uf
G923-300T1Uf
G923-310T1Uf
G923-315T1Uf
G923-320T1Uf
G923-330T1Uf
G923-340T1Uf
G923-350T1Uf
G923-360T1Uf
G923-370T1Uf
G923-380T1Uf
G923-390T1Uf
G923-400T1Uf
G923-410T1Uf
G923-420T1Uf
G923-430T1Uf
G923-440T1Uf
G923-450T1Uf
G923-460T1Uf
G923-470T1Uf
G923-475T1Uf
G923-480T1Uf
G923-490T1Uf
G923-500T1Uf
92AAx
92ABx
92ACx
92ADx
92AEx
92AFx
92AGx
92AHx
92AIx
92AJx
92AKx
92ALx
92AMx
92ANx
92AOx
92APx
92AQx
92ARx
92ASx
92ATx
92AUx
92AVx
92AWx
92AXx
92AYx
92AZx
92BAx
92BBx
92BCx
92BDx
92BEx
92BFx
92BGx
92BHx
92BIx
92BJx
92BKx
92BLx
92BMx
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Ver: 1.1
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2
Global Mixed-mode Technology Inc.
G923
Continuous Power Dissipation (TA = 25°C)
Absolute Maximum Ratings
SOT-23-5. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 520mW
Operating Temperature Range . . . . . . . -40°C to 85°C
Junction Temperature. . . . . . . . . . . . . . . . . . . . .150°C
Thermal Resistance Junction to Ambient, (θJA)
SOT-23-5. . . . . . . . . . . . . . . . . . . . . . . . 240°C/Watt(1)
Storage Temperature Range. . . . . . . .-65°C to 160°C
Reflow Temperature (soldering, 10sec) . . . . . . 260°C
VIN to GND. . . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 7V
Output Short-Circuit Duration . . . . . . . . . . . . . .Infinite
SET to GND . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
SHDNto GND. . . . . . . . . . . . . . . . . . . . . .-0.3V to 7V
SHDNto IN. . . . . . . . . . . . . . . . . . . . . . . .-7V to 0.3V
OUT to GND. . . . . . . . . . . . . . . . -0.3V to (VIN + 0.3V)
Note (1): See Recommended Minimum Footprint (Figure 3)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the
specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(VIN =+3.6V, V SHDN =VIN, TA =TJ =+25°C, unless otherwise noted.) (Note 1)
PARAMETER
Input Voltage (Note 2)
SYMBOL
VIN
CONDITION
MIN TYP MAX UNIT
2.5
-2
---
---
---
---
5.5
2
V
%
Output Voltage Accuracy
Adjustable Output Voltage Range (Note 3)
Maximum Output Current
Current Limit (Note 4)
VOUT
Variation from specified VOUT, IOUT=1mA
VOUT
VSET
300
5.5
---
---
---
---
---
---
V
mA
mA
mA
µA
ILIM
Isc
IQ
400 550
Short Circuit Current
---
---
---
---
280
90
Ground Pin Current
IOUT =150mA
IOUT =300mA
200
400
Dropout Voltage (Note 5)
Line Regulation
VDROP
mV
SET=GND, VIN=V(STD)+0.1V,to 5.5V
IOUT=10mA
ΔVLNR
ΔVLDR
---
0.06 ---
%/V
Load Regulation
Ripple Rejection
SHUTDOWN
I
OUT = 10mA to 300mA
---
---
0.02 --- %/mA
PSRR F=100Hz, 0.45VP-P, IOUT=10mA
65
---
dB
VIH
Regulator enabled
Regulator shutdown
1.5
---
---
---
---
SHDN Input Threshold
V
VIL
0.4
I
SHDN
V SHDN = VIN
TA = +25°C
TA = +25°C
SHDN Input Bias Current
Shutdown Supply Current
SET INPUT
--- 0.003 0.1
--- 0.2
µA
µA
IQSHDN VOUT = 0V
1
VIN = 2.5V to 5.5V,
OUT = 1mA
TA = +25°C
1.225 1.25 1.275
SET Reference Voltage (Note 3)
VSET
ISET
V
I
TA = TMIN to TMAX
TA = +25°C
---
---
1.25 ---
SET Input Leakage Current (Note 3)
THERMAL PROTECTION
VSET = 1.3V
5
30
nA
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TSHDN
---
---
145
25
---
---
°C
°C
ΔTSHDN
Note 1: Limits is 100% production tested at TA= +25°C. Low duty pulse techniques are used during test to maintain junc-
tion temperature as close to ambient as possible.
Note 2: Guaranteed by line regulation test.
Note 3: Adjustable mode only.
Note 4: Not tested. For design purposes, the current limit should be considered 400mA minimum to 650mA maximum.
Note 5: The dropout voltage is defined as (VIN-VOUT) when VOUT is 100mV below the target value of VOUT. The performance of
every G923 part, see “Typical Performance Characteristics”.
TEL: 886-3-5788833
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Ver: 1.1
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Global Mixed-mode Technology Inc.
G923
Typical Performance Characteristics
(VIN= 5V, VOUT = 3.3V, CIN = 1µF, COUT = 1µF, TA=25°C, unless otherwise noted.)
Line Transient
Load Transient
Short Circuit Current
Start-Up
Overcurrent Protection Characteristics
Ripple Rejection
80
70
60
50
40
30
20
10
0
IL=100mA
IL=10mA
VIN=5V ; COUT =1 F
µ
V
ripple(pk-pk)=448mV
10
100
1000
Frequency (Hz)
10000
100000
TEL: 886-3-5788833
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Ver: 1.1
Jan 19, 2006
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Global Mixed-mode Technology Inc.
Typical Performance Characteristics (continued)
G923
Shuntdown Pin Delay
Shuntdown Pin Delay
Dropout vs IO
500
400
300
200
100
0
0
50
100
150
200
250
300
Io (mA)
Recommended Minimum Footprint
SOT-23-5
TEL: 886-3-5788833
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Global Mixed-mode Technology Inc.
Pin Description
G923
NAME
PIN
FUNCTION
Active-Low Shutdown Input. A logic low reduces the supply current to less than 1µA. Connect to IN for normal opera-
tion.
SHDN
1
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to maxi-
mize thermal dissipation.
2
3
4
GND
IN
Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1µF to GND
Regulator Output. Fixed or adjustable from 1.25V to +5.5V. Sources up to 300mA. Bypass with a 1µF, ＜0.2Ω
OUT
typical ESR capacitor to GND.
Feedback Input for Setting the Output Voltage. Connect to GND to set the output voltage to the preset output
voltage. Connect to an external resistor divider for adjustable-output operation.
5
SET
voltage up to 1.25V. Thus, through this feedback ac-
Detailed Description
tion, the error amplifier, output PMOS, and the voltage
dividers effectively form a unity-gain amplifier with the
feedback voltage force to be the same as the 1.25V
bandgap reference. The output voltage, VOUT, is then
given by the following equation:
The block diagram of the G923 is shown in Figure 1. It
consists of an error amplifier, 1.25V bandgap reference,
PMOS output transistor, internal feedback voltage divider,
mode comparator, shutdown logic, over current protec-
tion circuit, and over temperature protection circuit.
VOUT = 1.25 (1 + R1/R2).
(1)
The mode comparator compares the SET pin voltage
with an internal 350mV reference. If the SET pin volt-
age is less than 350mV, the internal feedback voltage
divider’s central tap is connected to the non-inverting
input of the error amplifier. The error amplifier com-
pares non-inverting input with the 1.25V bandgap ref-
erence. If the feedback voltage is higher than 1.25V,
the error amplifier’s output becomes higher so that the
PMOS output transistor has a smaller gate-to-source
voltage (VGS). This reduces the current carrying capa-
bility of the PMOS output transistor, as a result the
output voltage decreases until the feedback voltage is
equal to 1.25V. Similarly, when the feedback voltage is
less than 1.25V, the error amplifier causes the output
PMOS to source more current to pull the feedback
Alternatively, the relationship between R1 and R2 is
given by:
R1 = R2 (VOUT /1.25 - 1).
(2)
For the reasons of reducing power dissipation and
loop stability, R2 is chosen to be 100KΩ. For G923-
330, R1 is 164K, and the pre-set VOUT is 3.30V.
When external voltage divider is used, as shown in
Figure 2, the SET pin voltage will be larger than
350mV. The non-inverting input of the amplifier will be
connected to the external voltage divider. However,
the operation of the feedback loop is the same, so that
the conditions of Equations 1 and 2 are still true. The
output voltage is still given by Equation 1.
IN
SHDN
－
OVER CURRENT
PROTECT & DYNAMIC
FEEDBACK
P
ERROR
AMP
SHUTDOWN
LOGIC
＋
OUT
SET
－
R1
OVER TEMP.
PROTECT
1.25V
Vref
＋
＋
－
350mV
R2
MODE COMPARATOR
GND
Figure 1. Functional Diagram
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Global Mixed-mode Technology Inc.
G923
mount device, heat sinking is accomplished by using
the heat spreading capabilities of the PC board and its
copper traces. In the case of a SOT-23-5 package, the
thermal resistance is typically 240°C/Watt. (See Rec-
ommended Minimum Footprint) [Figure 3] Refer to
Figure 4 is the G923 valid operating region (Safe Op-
erating Area) & refer to Figure 5 is maximum power
dissipation of SOT-23-5.
OUTPUT
VOLTAGE
OUT
IN
R1
R2
＋
－
G923
SET
RL
CIN
1µF
SHDN
BATTERY
COUT
1µF
GND
The die attachment area of the G923’s lead frame is
connected to pin 2, which is the GND pin. Therefore,
the GND pin of G923 can carry away the heat of the
G923 die very effectively. To improve the maximum
power providing capability, connect the GND pin to
ground using a large ground plane near the GND pin.
Figure 2. Adjustable Output Using External
Feedback Resistors
Applications Information
Capacitor Selection and Regulator Stability
Normally, use a 1µF capacitor on the input and a 1µF
capacitor on the output of the G923. Larger input ca-
pacitor values and lower ESR provide better sup-
ply-noise rejection and transient response. A higher-
value input capacitor (10µF) may be necessary if large,
fast transients are anticipated and the device is lo-
cated several inches from the power source.
Over Current Protection
The G923 uses a current sense-resistor to monitor the
output current. A portion of the PMOS output transis-
tor’s current is mirrored to a resistor such that the
voltage across this resistor is proportional to the output
current. Once the output current exceeds limit thresh-
old, G923 would be protected with a limited output
current. Further more, when the output is short to
ground, the output current would be folded-back to a
less limit.
Power-Supply Rejection and Operation from
Sources Other than Batteries
The G923 is designed to deliver low dropout voltages
and low quiescent currents in battery powered sys-
tems. Power-supply rejection is 65dB at low frequen-
cies. As the frequency increases above 20kHz, the
output capacitor is the major contributor to the rejec-
tion of power-supply noise.
Over Temperature Protection
To prevent abnormal temperature from occurring, the
G923 has a built-in temperature monitoring circuit.
When it detects the temperature is above 145°C, the
output transistor is turned off. When the IC is cooled
down to below 120°C, the output is turned on again. In
this way, the G923 will be protected against abnormal
junction temperature during operation.
When operating from sources other than batteries,
improve supply-noise rejection and transient response
by increasing the values of the input and output ca-
pacitors, and using passive filtering techniques.
Shutdown Mode
When the SHDN pin is connected a logic low voltage,
the G923 enters shutdown mode. All the analog cir-
cuits are turned off completely, which reduces the
current consumption to only the leakage current. The
G923 output pass transistor would get into high im-
pedance level. There is an internal discharge path to
help to shorten discharge delay time.
Load Transient Considerations
The G923 load-transient response graphs show two
components of the output response: a DC shift of the
output voltage due to the different load currents, and
the transient response. Typical overshoot for step
changes in the load current from 10mA to 300mA is
8mV. Increasing the output capacitor's value and de-
creasing its ESR attenuates transient spikes.
Operating Region and Power Dissipation
Since the G923 is a linear regulator, its power dissipa-
tion is always given by P = IOUT (VIN - VOUT). The maxi-
mum power dissipation is given by:
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage differential
(or dropout voltage) determines the lowest usable sup-
ply voltage. In battery-powered systems, this will de-
termine the useful end-of-life battery voltage. Because
the G923 use a P-channel MOSFET pass transistor,
their dropout voltage is a function of RDS(ON) multiplied
by the load current.
PD(MAX) = (TJ - TA) /θJA,=(150°C-25°C)/240°C/W = 520mW
Where (TJ -TA) is the temperature difference the G923
die and the ambient air,θJA, is the thermal resistance
of the chosen package to the ambient air. For surface
TEL: 886-3-5788833
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Global Mixed-mode Technology Inc.
G923
Layout Guide
The output capacitor also must be located a distance
of not more than 1cm from output to a clean analog
ground. Because it can filter out the output spike
caused by the surge current due to the inductive effect
of the package pin and the printed circuit board’s rout-
ing wire. Figure 6 is adjustable mode of G923 PCB
layout. Figure 7 is a PCB layout of G923 fixed mode.
An input capacitance of ≅ 1µF is required between the
G923 input pin and ground (the amount of the capaci-
tance may be increased without limit), This capacitor
must be located a distance of not more than 1cm from
the input and return to a clean analog ground.
Input capacitor can filter out the input voltage spike
caused by the surge current due to the inductive effect
of the package pin and the printed circuit board’s rout-
ing wire. Otherwise, the actual voltage at the IN pin
may exceed the absolute maximum rating.
Figure 3. Recommended Minimum Footprint
Safe Operating Area of G923 [Power Dissipation Limit]
Maximum Power Dissipation of SOT-23-5
200
0.7
Still Air
Maximum Recommended Output Current
0.6
0.5
0.4
0.3
0.2
1oz copper on SOT-23-5 Package
?
°
Mounted on recommended foorprint (R JA=240 C/W)
150
TA=25
℃
100
TA=55
℃
TA=85
℃
TA=25°C,Still Air
1ozCopper on SOT-23-5Package
50
Mounted on recommended mimimum footprint (R JA=240 C/ W)
θ
°
0.1
0
0
0.0
0 .5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
25
35
45
55
65
75
85
95 105 115 125
Input-Output Voltage Differential VIN-VOUT (V)
Note : VIN(m ax ) <=5.5V
Figure 4 Safe Operating Area
t Tt
Amibent TemperatureTA ( C)
°
Figure 5 Power Dissipation vs. Temperature
Figure 6. Adjustable Mode
*Distance between pin & capacitor must no more than 1cm
Figure 7. Fixed Mode
*Distance between pin & capacitor must no more than 1cm
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Global Mixed-mode Technology Inc.
Package Information
G923
C
D
L
H
E
θ1
e1
e
A
A2
A1
b
Note:
1. Package body sizes exclude mold flash protrusions or gate burrs
2. Tolerance ±0.1000 mm (4mil) unless otherwise specified
3. Coplanarity: 0.1000mm
4. Dimension L is measured in gage plane
DIMENSION IN MM
SYMBOL
DIMENSION IN INCH
MIN.
1.00
0.00
0.70
0.35
0.10
2.70
1.40
-----
NOM.
1.10
MAX.
1.30
0.10
0.90
0.50
0.25
3.10
1.80
-----
MIN.
0.039
0.000
0.028
0.014
0.004
0.106
0.055
-----
NOM.
0.043
-----
MAX.
0.051
0.004
0.035
0.020
0.010
0.122
0.071
-----
A
A1
A2
b
-----
0.80
0.031
0.016
0.006
0.114
0.063
0.075(TYP)
0.037
0.110
-----
0.40
C
0.15
D
2.90
E
1.60
e
1.90(TYP)
0.95
e1
H
-----
-----
-----
-----
2.60
0.37
1°
2.80
3.00
-----
0.102
0.015
1°
0.118
-----
L
------
θ1
5°
9°
5°
9°
Taping Specification
PACKAGE
Q’TY/REEL
3,000 ea
SOT-23-5
Feed Direction
SOT-23-5 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
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Ver: 1.1
Jan 19, 2006
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SI9137DB
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