G924-220T1UF [GMT]
300mA Low-Noise LDO Regulators; 300mA低压噪声LDO稳压器
| 型号： | G924-220T1UF |
| 厂家： | 
GLOBAL MIXED-MODE TECHNOLOGY INC |
| 描述： | 300mA Low-Noise LDO Regulators |
| 文件： | 总9页 (文件大小：428K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Global Mixed-mode Technology Inc.
300mA Low-Noise LDO Regulators
General Description
G924
Features
Low, 90µA No-Load Supply Current
The G924 is a low supply current, 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 G924 is from
2.5V to 5.5V. The over-current protection limit is set at
550mA typical and 400mA minimum. An over-tem-
perature protection circuit is built-in in the G924 to
prevent thermal overload. These power saving
features make the G924 ideal for use in the battery-
powered applications such as notebook computers,
cellular phones, and PDA’s.
Guaranteed 300mA Output Current
Dropout Voltage is 200mV @ 150mA Load
PSRR=53dB @ 1kHz
Over-Temperature Protection and Short-Circuit
Protection
Max. Supply Current in Shutdown Mode < 1µA
Low Output Noise at 28µVRMS
Stable with low cost ceramic capacitors
Output voltage: 1.20V~5.00V
Applications
Notebook Computers
Cellular Phones
PDAs
Digital still Camera and Video Recorders
Hand-Held Devices
Audio Codec
Pin Configuration
Typical Application Circuit
OUTPUT
VOLTAGE
1
5
4
SHDN
VIN
VIN
OUT
BYP
G924
＋
CIN
_ 1µF
COUT
1µF
SHDN
2
3
GND
BYP
G924
BATTERY
CBYP
10nF
GND
OUT
SOT-23-5
Fixed mode
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Ver: 0.2 Preliminary
Oct 01, 2004
1
Global Mixed-mode Technology Inc.
G924
Ordering Information
ORDER
NUMBER
ORDER NUMBER
(Pb free)
TEMP.
RANGE
MARKING
VOLTAGE
PACKAGE
G924-330T1U
G924-330T1Uf
94AXx
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
OUTPUT VOLTAGE (V)
MARKING
(Pb free)
G924-120T1U
G924-130T1U
G924-140T1U
G924-150T1U
G924-160T1U
G924-170T1U
G924-180T1U
G924-190T1U
G924-200T1U
G924-210T1U
G924-220T1U
G924-230T1U
G924-240T1U
G924-250T1U
G924-260T1U
G924-270T1U
G924-280T1U
G924-285T1U
G924-290T1U
G924-300T1U
G924-310T1U
G924-315T1U
G924-320T1U
G924-330T1U
G924-340T1U
G924-350T1U
G924-360T1U
G924-370T1U
G924-380T1U
G924-390T1U
G924-400T1U
G924-410T1U
G924-420T1U
G924-430T1U
G924-440T1U
G924-450T1U
G924-460T1U
G924-470T1U
G924-475T1U
G924-480T1U
G924-490T1U
G924-500T1U
G924-120T1Uf
G924-130T1Uf
G924-140T1Uf
G924-150T1Uf
G924-160T1Uf
G924-170T1Uf
G924-180T1Uf
G924-190T1Uf
G924-200T1Uf
G924-210T1Uf
G924-220T1Uf
G924-230T1Uf
G924-240T1Uf
G924-250T1Uf
G924-260T1Uf
G924-270T1Uf
G924-280T1Uf
G924-285T1Uf
G924-290T1Uf
G924-300T1Uf
G924-310T1Uf
G924-315T1Uf
G924-320T1Uf
G924-330T1Uf
G924-340T1Uf
G924-350T1Uf
G924-360T1Uf
G924-370T1Uf
G924-380T1Uf
G924-390T1Uf
G924-400T1Uf
G924-410T1Uf
G924-420T1Uf
G924-430T1Uf
G924-440T1Uf
G924-450T1Uf
G924-460T1Uf
G924-470T1Uf
G924-475T1Uf
G924-480T1Uf
G924-490T1Uf
G924-500T1Uf
1.20
1.30
1.40
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
94AAx
94ABx
94ACx
94ADx
94AEx
94AFx
94AGx
94AHx
94AIx
94AJx
94AKx
94ALx
94AMx
94ANx
94AOx
94APx
94AQx
94ARx
94ASx
94ATx
94AUx
94AVx
94AWx
94AXx
94AYx
94AZx
94BAx
94BBx
94BCx
94BDx
94BEx
94BFx
94BGx
94BHx
94BIx
94BJx
94BKx
94BLx
94BMx
94BNx
94BOx
94BPx
TEL: 886-3-5788833
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Ver: 0.2 Preliminary
Oct 01, 2004
2
Global Mixed-mode Technology Inc.
G924
Absolute Maximum Ratings
VIN to GND.………………………………-0.3V to +6.5V
Output Short-Circuit Duration…….….……….…Infinite
Operating Temperature Range…….....-40°C to +85°C
Junction Temperature………………...………+150°C
θJA(1)….…..…………….……….…..…..240°C/Watt
Storage Temperature Range……….-65°C to +150°C
Reflow Temperature (soldering, 10sec)…..…….260°C
SHDNto GND……..………....….….-0.3V to VIN+0.3V
OUT to GND………………………-0.3V to (VIN + 0.3V)
Continuous Power Dissipation (TA = +25°C)
SOT-23-5………..…………..……….……….…520mW
Note (1): See Recommended Minimum Footprint
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 =5V, V SHDN =VIN, TA =TJ =25°C, unless otherwise noted.) (Note 1)
PARAMETER
Input Voltage (Note 2)
SYMBOL
CONDITION
MIN TYP MAX UNIT
VIN
2.5
-2
---
---
---
---
---
5.5
2
V
V
OUT≥2.50V, IOUT=1mA
Output Voltage Accuracy
VOUT
%
2.50V>VOUT≥1.80V, IOUT=1mA
1.80V>VOUT≥1.20V, IOUT=1mA
-3
3
-4
4
Maximum Output Current
Current Limit (Note 3)
Short Circuit Current
Ground Pin Current
300
---
---
---
---
mA
mA
mA
µA
ILIM
Isc
IQ
400 550
---
280
90
---
---
---
---
---
---
---
---
---
VOUT=1.50V
1.36 ---
1.10 ---
0.58 ---
0.41 ---
0.36 ---
0.25 ---
0.24 ---
0.06 ---
VOUT=1.80V
VOUT=2.50V
VOUT=3.00V
VOUT=3.30V
VOUT=4.75V
VOUT=5.00V
Dropout Voltage (Note 4)
VDROP IOUT =300mA
V
Line Regulation
Load Regulation
Ripple Rejection
∆VLNR VIN=VOUT+0.1V,to 5.5V IOUT=10mA
∆VLDR
OUT = 10mA to 300mA
PSRR F=1kHz, 0.45VP-P, IOUT=10mA
%/V
I
---
---
0.02 --- %/mA
53
28
---
dB
Output Voltage Noise
(10Hz to 100kHz)
en
COUT = 1µF, IOUT = 1mA, CBYP = 10nF
---
--- µVRMS
SHUTDOWN
VIH
Regulator enabled
Regulator shutdown
1.5
---
---
---
---
V
0.4
SHDN Input Threshold
VIL
I
SHDN
V SHDN = VIN
TA = +25°C
TA = +25°C
SHDN Input Bias Current
--- 0.003
1
1
µA
µA
Shutdown Supply Current
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
IQSHDN VOUT = 0V
---
0.2
TSHDN
---
---
145
25
---
---
°C
°C
∆TSHDN
Note 1: Limits is 100% production tested at TA= +25°C. Low duty pulse techniques are used during test to
maintain junction temperature as close to ambient as possible.
Note 2: Guaranteed by line regulation test.
Note 3: Not tested. For design purposes, the current limit should be considered 400mA minimum.
Note 4: The dropout voltage is defined as (VIN-VOUT) when VOUT is 100mV below the target value of VOUT. The per-
formance of every G924 part, see “Typical Performance Characteristics”.
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 0.2 Preliminary
Oct 01, 2004
3
Global Mixed-mode Technology Inc.
G924
Typical Performance Characteristics
(VIN =5V, CIN=1µF, COUT=1µF, V SHDN = VIN, G924-475, TA =25°C, unless otherwise noted.)
Line Transient
Load Transient
Short Circuit Current
Ripple Rejection
70
60
50
40
30
20
10
0
100mA
200mA
300mA
VIN=6V ;
CIN=1µF ; COUT=1µF
CBYP=10nF ; Vr=224mv
0.01
0.1
1
10
100
Frequency (KHz)
Turn-ON
Turn-OFF
TEL: 886-3-5788833
Ver: 0.2 Preliminary
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Oct 01, 2004
4
Global Mixed-mode Technology Inc.
G924
Typical Performance Characteristics (continued)
Dropout Voltage vs. IL
Overcurrent Protection Characteristics
300
250
200
150
100
50
TA=85°C
TA=25°C
TA=-25°C
0
0
50
100
150
IL (mA)
200
250
300
Output Voltage vs. Temperature
Output Noise
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
IL=10mA
VIN=5.5V
VIN=5.0V
-25 -15 -5
5
15 25 35 45 55 65 75 85
Temperature (°C)
Safe Operating Area
[Power Dissipation Limit]
Max. Power Dissipation vs. Temperature
400
350
300
250
200
150
100
50
0.7
Still Air
Maximum Recommended Output Current
Still air
1oz Copper on SOT-23-5 Package
Mounted on recommended mimimum
footprint (RθJA=240°C/W)
0.6
0.5
0.4
0.3
0.2
0.1
0
TA=85°C
TA=55°C
TA=25°C
1oz Copper on SOT-23-5 Package
Mounted on recommended mimimum
footprint (RθJA=240°C/W)
0
25 35 45 55 65 75 85 95 105 115 125
0.1
Input-Output Voltage Differential VIN-VOUT (V)
Note: VIN(max) <= 5.5V
0.4
0.7
1.0
1.3
1.6
1.9
2.2
Amibent Temperature TA (°C)
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Ver: 0.2 Preliminary
Oct 01, 2004
5
Global Mixed-mode Technology Inc.
G924
Pin Description
NAME
PIN
FUNCTION
Active-High Enable Input. A logic low reduces the supply current to less than 1µA. Connect to IN for
normal operation.
SHDN
1
Ground. This pin also functions as a heat sink. Solder to large pads or the circuit board ground
plane to maximize thermal dissipation.
2
3
GND
BYP
This is a reference bypass pin. It should connect external 10nF capacitor to GND to reduce output
noise. Bypass capacitor must be no less than 1nF. (CBYP≥ 1nF)
4
5
OUT
VIN
Regulator Output. Sources up to 300mA. Bypass with a 1µF capacitor to GND.
Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1µF to GND.
1.20V, the error amplifier causes the output PMOS to
Detailed Description
conduct more current to pull the feedback voltage up
to 1.20V. Thus, through this feedback action, the error
amplifier, output PMOS, and the voltage dividers effec-
tively form a unity-gain amplifier with the feedback
voltage force to be the same as the 1.20V bandgap
reference. The output voltage, VOUT, is then given by
the following equation:
The block diagram of the G924 is shown in Figure 1. It
consists of an error amplifier, 1.20V bandgap refer-
ence, PMOS output transistor, internal feedback
voltage divider, shutdown logic, over current protection
circuit, and over temperature protection circuit.
The internal feedback voltage divider’s central tap is
connected to the non-inverting input of the error ampli-
fier. The error amplifier compares non-inverting input
with the 1.20V bandgap reference. If the feedback
voltage is higher than 1.20V, the error amplifier’s out-
put becomes higher so that the PMOS output transis-
tor has a smaller gate-to-source voltage (VGS). This
reduces the current carrying capability of the PMOS
output transistor, as a result the output voltage de-
creases until the feedback voltage is equal to 1.20V.
Similarly, when the feedback voltage is less than
VOUT = 1.20 (1 + R1/R2).
(1)
Alternatively, the relationship between R1 and R2 is
given by:
R1 = R2 (VOUT / 1.20 - 1).
(2)
For the output voltage versions of G924, the output
voltages are 1.20V for G924-120, 2.50V for G924-250,
3.30V for G924-330, etc.
VIN
SHDN
－
OVER CURRENT
PROTECT & DYNAMIC
FEEDBACK
ERROR
AMP
SHUTDOWN
LOGIC
＋
OUT
BYP
R1
OVER TEMP.
PROTECT
1.2V
Vref
CBYP
R2
GND
Figure 1. Functional Diagram
TEL: 886-3-5788833
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Ver: 0.2 Preliminary
Oct 01, 2004
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Global Mixed-mode Technology Inc.
G924
Over Current Protection
Refer to “Safe Operating Area” of the Typical Per-
formance Characteristics is the G924 valid operating
region & refer to “Maximum Power Dissipation vs.
Temperature” is the maximum power dissipation of
SOT-23-5.
The G924 uses a current mirror to monitor the output
current. A small portion of the PMOS output transis-
tor’s current is mirrored onto a resistor such that the
voltage across this resistor is proportional to the output
current. This voltage is compared against the 1.20V
reference. Once the output current exceeds the limit,
the PMOS output transistor is turned off. Once the
output transistor is turned off, the current monitoring
voltage decreases to zero, and the output PMOS is
turned on again. If the over current condition persist,
the over current protection circuit will be triggered
again. Thus, when the output is shorted to ground, the
output current will be alternating between 0 and the
over current limit. The typical over current limit of the
G924 is set to 550mA. Note that the input bypass ca-
pacitor of 1µF must be used in this case to 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 routing wire. Otherwise, the ac-
tual voltage at the IN pin may exceed the absolute
maximum rating.
The die attachment area of the G924’s lead frame is
connected to pin 2, which is the GND pin. Therefore,
the GND pin of G924 can carry away the heat of the
G924 die very effectively. To improve the power dis-
sipation, connect the GND pin to ground using a large
ground plane near the GND pin.
Applications Information
Capacitor Selection and Regulator Stability
Normally, use a 1µF capacitor on the input and a 1µF
capacitor on the output of the G924. 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.
Power-Supply Rejection and Operation from
Sources Other than Batteries
Over Temperature Protection
To prevent abnormal temperature from occurring, the
G924 has a built-in temperature monitoring circuit.
When it detects the temperature is above 145oC, the
output transistor is turned off. When the IC is cooled
down to below 120oC, the output is turned on again. In
this way, the G924 will be protected against abnormal
junction temperature during operation.
The G924 is designed to deliver low dropout voltages
and low quiescent currents in battery powered sys-
tems. Power-supply rejection is 53dB 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.
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 G924 enters shutdown mode. All the analog cir-
cuits are turned off completely, which reduces the
current consumption to only the leakage current. The
output is disconnected from the input. When the output
has no load at all, the output voltage will be dis-
charged to ground through the internal resistor voltage
divider.
Load Transient Considerations
The G924 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
30mV. Increasing the output capacitor's value and
decreasing its ESR attenuates transient spikes.
Operating Region and Power Dissipation
Since the G924 is a linear regulator, its power dissipa-
tion is always given by P = IOUT (VIN – VOUT). The
maximum power dissipation is given by:
Input-Output (Dropout) Voltage
A regulator's minimum input-output voltage differential
(or dropout voltage) determines the lowest usable
supply voltage. In battery-powered systems, this will
determine the useful end-of-life battery voltage. Be-
cause the G924 use a P-channel MOSFET pass tran-
sistor, their dropout voltage is a function of RDS(ON)
multiplied by the load current cause the G924 use a
P-channel MOSFET pass transistor, their dropout
voltage is a function of RDS(ON) multiplied by the load
current.
PDMAX = (TJ – TA)/θJA = (150-25) / 240 = 520mW
Where (TJ – TA) is the temperature difference the
G924 die and the ambient air, θJA, is the thermal re-
sistance of the chosen package to the ambient air. For
surface 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
240oC/Watt. (See Recommended Minimum Footprint).
TEL: 886-3-5788833
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Ver: 0.2 Preliminary
Oct 01, 2004
7
Global Mixed-mode Technology Inc.
G924
ing wire. Otherwise, the actual voltage at the IN pin
may exceed the absolute maximum rating.
Layout Guide
An input capacitance of 1µF is required between the
G924 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.
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.
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-
Recommend Minimum Footprint
SOT-23-5
TEL: 886-3-5788833
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Ver: 0.2 Preliminary
Oct 01, 2004
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Global Mixed-mode Technology Inc.
G924
Package Information
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
DIMENSIONS IN MILLIMETERS
SYMBOLS
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
-----
A
A1
A2
b
-----
0.80
0.40
C
0.15
D
2.90
E
1.60
e
1.90(TYP)
0.95
e1
H
-----
-----
2.60
0.37
1º
2.80
3.00
-----
L
------
5º
θ1
9º
Taping Specification
PACKAGE
Q’TY/REEL
SOT-23-5
3,000 ea
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
http://www.gmt.com.tw
Ver: 0.2 Preliminary
Oct 01, 2004
9
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