AAP2917 [ETC]
300mA, High PSRR Low-Noise LDO; 300毫安，高PSRR低噪声LDO
| 型号： | AAP2917 |
| 厂家： | 
ETC |
| 描述： | 300mA, High PSRR Low-Noise LDO |
| 文件： | 总12页 (文件大小：269K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
芯美 子
AAP2917
300mA, High PSRR Low-Noise LDO
DESCRIPTION
FEATURES
z
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Space-Saving 5-pin SC-70 Package
2.5V to 6V Input Voltage Range
50µV(rms) Output Noise
250mV Dropout @ 300mA
75dB PSRR at 1kHz
Low 70µA Ground Current
Up to 300mA Output Current
Stability with 1µF Ceramic Output Capacitors
Excellent Load/Line Transient
The AAP2917 is an efficient, CMOS voltage regulator
optimized for ultra-low-noise applications. It offers
high output accuracy, extremely low dropout voltage
low ground current and fast start-up time.
The AAP2917 provides a very low noise output, ideal
for RF applications where a clean voltage source is
required. A noise bypass pin is also available for
further reduction of output noise.
Designed specifically for handheld and battery-
powered devices, the AAP2917 provides
a
TTL-logic-compatible enable pin. When disabled,
power consumption drops nearly to zero.
Thermal Shutdown and Current Limit
The AAP2917 also works with low-ESR ceramic
capacitors, reducing the amount of board space
necessary for power applications, critical in handheld
wireless devices.
Protection
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Available in 1.2V,1.3V,1.5V,1.8V,1.85V,
2.5V,2.8V,2.85V, 2.9V,3.0V,3.3V,3.5V,4.8V
and Adjustable Voltages
Available in the SC-70 and SOT23-5 package, the
AAP2917 offers a wide range of output voltages. Key
features include current limit, thermal shutdown and
faster transient response.
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
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Cellular Phones
Bluetooth Portable Radios and Accessories
PDA and Palmtop Computers
Consumer/Personal Electronics
Block Diagram
Figure 1.
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Typical Application Circuit
Figure 2. Fixed-Voltage LDO Regulator
Pin Configurations
Pin Configurations
Package Type
SC-70
SOT23-5
Fixed-Voltage
Adjustable Voltage
Pin Description
PIN
VIN
PIN
DESCRIPTION
1
2
3
Input voltage of the LDO
Common ground
GND
VEN
Enable input logic, enable high
BYPASS
ADJ
Optional bypass capacitor for noise reduction
Adjustable regulator feedback input. Connect to resistor divider.
Output voltage of the LDO
4
5
VOUT
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Ordering Information
Order Number
Package Type
Marking
Operating Temperature Range
AAP2917-12NIR1
AAP2917-13NIR1
AAP2917-15NIR1
AAP2917-18NIR1
AAP2917-185NIR1
AAP2917-25NIR1
AAP2917-28NIR1
AAP2917-285NIR1
AAP2917-29NIR1
AAP2917-30NIR1
AAP2917-33NIR1
AAP2917-35NIR1
AAP2917-48NIR1
AAP2917NIR1
AAP2917-12VIR1
AAP2917-13VIR1
AAP2917-15VIR1
AAP2917-18VIR1
AAP2917-185VIR1
AAP2917-25VIR1
AAP2917-28VIR1
AAP2917-285VIR1
AAP2917-29VIR1
AAP2917-30VIR1
AAP2917-33VIR1
AAP2917-35VIR1
AAP2917-48VIR1
AAP2917VIR1
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
SC-70
pT xx
pX xx
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
-40 °C to 125°C
pC xx
pD xx
pU xx
pB xx
pE xx
pF xx
pW xx
pG xx
pH xx
pR xx
pK xx
SC-70
pA xx
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
pT xxxx
pX xxxx
pC xxxx
pD xxxx
pU xxxx
pB xxxx
pE xxxx
pF xxxx
pW xxxx
pG xxxx
pH xxxx
pR xxxx
pK xxxx
pA xxxx
AAP2917- □□□ □ □ □ □
Lead Free Code
1: Lead Free 0: Lead
Packing
R: Tape & Reel
Operating temperature range
I: Industry Standard
Package Type
N: SC-70 V: SOT-23
Output Voltage
12:1.2V
13:1.3V 15:1.5V 18:1.8V
185:1.85V 25:2.5V 28:2.8V
285:2.85V 29:2.9V 30:3.0V
33:3.3V
35:3.5V 48:4.8V Blank: Adjustable
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Absolute Maximum Ratings
VIN,VEN ------------------------------------------------------------------------------- -0.3 to 6.5V
VOUT ----------------------------------------------------------------------------- -0.3 to (VIN+0.3)
Junction Temperature --------------------------------------------------------------------- 150°C
Storage Temperature Range ---------------------------------------------------- -65°C to +150°C
Lead Temperature -------------------------------------------------------------------------- 260°C
Thermal Resistance θJA(SC-70) --------------------------------------------------------- 330°C/W
Thermal Resistance θJA(SOT23-5) ------------------------------------------------------ 220°C/W
ESD Rating
Human Body Model ---------------------------------------------------------------------- 2kV
Operating Ratings
VIN --------------------------------------------------------------------------------------- 2.5 to 6V
VEN ----------------------------------------------------------------------------------- 0 to (VIN+0.3)
Operating Temperature Range ------------------------------------------------- -40°C to +125°C
Electrical Characteristics
Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85℃
,Unless otherwise specified.
AAP2917
Symbol
Parameter
Conditions
Unit
Min
2.5
-2
-3.0
300
300
Typ
Max.
Input Voltage
6
2
3.0
V
IOUT=1mA,TA=25℃
IOUT=1mA,TA=-40℃ to 85℃
∆VOUT Output Voltage Accuracy
%
IOUTMAX Maximum Output Current
ILIMIT Current Limit
TA>0℃
mA
mA
VOUT=VOUT(nom) 90%, T >0℃
440
72
250
80
300
70
110
0.02
0.002
0.01
0.05
800
125
350
135
400
160
250
0.25
0.013
1
×
A
VOUT≧3V, IOUT=80mA
VOUT≧3V ,IOUT=300mA
2.4≦VOUT≦3V,IOUT=80mA
2.4≦VOUT≦3V,IOUT=300mA
IOUT=0.05mA
VDROP Dropout Voltage (Note1)
mV
µA
IQ
Quiescent Current
VIN=VOUT (nom)-0.1V,IOUT=0mA
VIN=(VOUT+0.5V) to 6V, IOUT=0.1mA
VLNR
VLDR
Line Regulation
Load Regulation
%/V
%/mA
1mA I
300mA
≤
≤
OUT
VEN=0,TA=25℃
VEN=0,TA=85℃
ISHDN Shutdown Supply Current
µA
dB
VIN=(VOUT+1V)DC+0.5VP-P
75
60
45
f=1kHz, ILOAD=10mA
Power Supply Ripple
VIN=(VOUT+1V)DC+0.5VP-P f=10kHz,
ILOAD=10mA
PSRR
Rejection
VIN=(VOUT+1V)DC+0.5VP-P
f=100kHz, ILOAD=10mA
Fixed-Voltage
Adjustable Voltage
RLOAD=50Ω,TA=25℃
50
239
f=10Hz~100kHz,
ILOAD=10mA
Output Noise Voltage (RMS)
Turn-on Time (Note2)
µV
µs
200
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Electrical Characteristics (continued)
Conditions: VIN=VOUT+0.5V or 2.5V whichever is greater,VEN=VIN,CIN=1uF,COUT=1uF,TA=-40~85℃
,Unless otherwise specified.
VENL (Maximum Low Level
VENL
VIN=2.5V to 5.5V
0.4
V
Input Voltage at EN)
VENH (Minimum high Level
VENH
VIN=2.5V to 5.5V
1.5
V
Input Voltage at EN)
VEN Input Bias Current
VIN=5.5V, VEN=0 or 5.5V
VIN=5.5V, VFB=1.3V
1
1
nA
nA
FB Input Bias Current (ADJ
Version)
FB Pin Voltage (ADJ
Version)
VFB
TSD
TA=25℃
1.176
1.2
155
15
1.224
V
Thermal Shutdown
Temperature
℃
℃
Thermal Shutdown
Hysteresis
∆TSD
Note 1: Dropout is defined as VIN-VOUT when VOUT is 100mV below the value of VOUT for VIN=VOUT+0.5V
Note 2: Test time needed for VOUT to reach 90% of final value.
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Typical Operating Characteristics
OUTPUT VOLTAGE ACCURACY vs. lOAD CURRENT
0.6
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.0
2.5
0.4
0.2
I
OUT=0mA
2.0
1.5
1.0
0.5
0.0
IOUT=300mA
0.0
-0.2
-0.4
-0.6
0
1
2
3
4
5
6
0
50
100
150
200
250
300
INPUTVOLTAGE (V)
LOAD CURRENT (mA)
DROPOUT VOLTAGE vs. LOAD CURRENT
OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE
0.8
350
300
250
200
150
100
50
IOUT=1mA
TEMP=85
TEMP=25
0.4
0.0
-0.4
-0.8
TEMP=-40
0
0
50
100
150
200
250
300
-40
-15
10
35
60
85
LOAD CURRENT (mA)
Temperature (oC)
GROUND CURRENT vs. INPUT VOLTAGE
IOUT=300mA
GROUND CURRENT vs. LOAD CURRENT
VIN=5.5V
240
200
160
120
80
240
200
160
120
80
IOUT=0mA
VIN=3.3V
40
40
0
0
0
1
2
3
4
5
6
0
50
100
150
200
250
300
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
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GROUND CURRENT vs. TEMPERATURE
120
100
80
60
40
20
0
-40 -20
0
20 40 60 80 100 120 140
TEMPERATURE (oC)
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Application Note
capacitance can drop by more than 50% as the
temperature goes from 25°C to 85°C. Therefore, X7R
is recommended over Z5U and Y5V in applications
where the ambient temperature will change
significantly above or below 25°C.
External Capacitors
Like any low-dropout regulator, the AAP2917 requires
external capacitors for regulator stability. The
AAP2917 is specifically designed for portable
applications requiring minimum board space and
smallest components. These capacitors must be
correctly selected for good performance.
Noise Bypass Capacitor
Connecting a 0.01µF capacitor between the CBYPASS
pin and ground significantly reduces noise on the
regulator output. This cap is connected directly to a
high impedance node in the bandgap reference circuit.
Any significant loading on this node will cause a
change on the regulated output voltage. For this reason,
DC leakage current through this pin must be kept as
low as possible for best output voltage accuracy. The
types of capacitors best suited for the noise bypass
capacitor are ceramic and film.
Input Capacitor
An input capacitance of 1µF is required between the
AAP2917 input pin and ground (the amount of the
capacitance may be increased without limit).
This capacitor must be located a distance of not more
than 1cm from the input pin and returned to a clean
analog ground. Any good quality ceramic, tantalum, or
film capacitor may be used at the input.
If a tantalum capacitor is used at the input, it must be
guaranteed by the manufacturer to have asurge current
rating sufficient for the application.
Unlike many other LDO’s, addition of a noise
reduction capacitor does not effect the load transient
response of the device.
There are no requirements for the ESR on the input
capacitor, but tolerance and temperature coefficient
must be considered when selecting the capacitor to
ensure the capacitance will be 1µF over the entire
operating temperature range.
Adjustable Operation
The adjustable version of the AAP2917 has an output
voltage range of 1.2V to 4.5V. The output voltage of
the AAP2917 adjustable regulator is programmed
using an external resistor divider as shown in Figure3.
The output voltage is calculated using:
Output Capacitor
The AAP2917 is designed specifically to work with
very small ceramic output capacitors. A ceramic
capacitor (temperature characteristics X7R, X5R, Z5U,
or Y5V) in 1 to 22µF range with 5mΩ to 500mΩ ESR
range is suitable in the AAP2917 application circuit.
The output capacitor must meet the requirement for
minimum amount of capacitance and also have an
ESR (Equivalent Series Resistance) value which is
within a stable range (5mΩ to 500mΩ)
R
R
1
V = V ×(1+
)
O
ref
2
Where:
Vref= 1.2V typ. (the internal reference voltage)
Utilize the following equation for adjusting the output
to a particular voltage:
No-Load Stability
V
1.2V
O
The AAP2917 will remain stable and in regulation
with no external load. This is specially important in
CMOS RAM keep-alive applications.
R1 = R
−1
2
Capacitor Characteristics
Choose R2=50k to optimize accuracy, power supply
rejection, noise and power consumption.
The AAP2917 is designed to work with ceramic
capacitors on the output to take advantage of the
benefits they offer: for capacitance values in the range
of 1µF to 4.7µF range, ceramic capacitors are the
smallest, least expensive and have the lowest ESR
values (which makes them best for eliminating high
frequency noise). The ESR of a typical 1µF ceramic
capacitor is in the range of 20mΩ to 40mΩ, which
easily meets the ESR requirement for stability by the
AAP2917.
The ceramic capacitor’s capacitance can vary with
temperature. The capacitor type X7R, which operates
over a temperature range of -55°C to +125°C, will
only vary the capacitance to within ±15%. Most large
value ceramic capacitors ( 2.2µF) are manufactured
≈
Figure3. Adjustable Regulator with Resistors
with Z5U or Y5V temperature characteristics. Their
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On/Off Input Operation
The AAP2917 is turned off by pulling the VEN pin low,
and turned on by pulling it high. If this feature is not
used, the VEN pin should be tied to VIN to keep the
regulator output on at all time. To assure proper
operation, the signal source used to drive the VEN
input must be able to swing above and below the
specified turn-on/off voltage thresholds listed in the
Electrical Characteristics section under VIL and VIH.
Fast Start up
The AAP2917 output starts up after Vref voltage
reaches its final value (1.2V nomial). The start-up time
is determined by the time constant of the bypass
capacitor. The smaller the capacitor value, the shorter
the start-up time, but less noise gets reduced. As a
result, start-up time and noise reduction need to be
taken into design consideration when choosing the
value of the bypass capacitor.
Thermal Considerations
Thermal protection limits power dissipation in
AAP2917.When the operation junction temperature
exceeds 155°C, the OTP circuit starts the thermal
shutdown function turn the pass element off. The pass
element turn on again after the junction temperature
cools by 15°C. For continue operation, do not exceed
absolute maximum operation junction temperature
125°C. The power dissipation definition in device is :
PD = VIN - VOUT × IOUT + VIN × IQ
( )
The maximum power dissipation depends on the
thermal resistance of IC package, PCB layout, the rate
of surroundings airflow and temperature difference
between junction to ambient. The maximum power
dissipation can be calculated by following formula :
TJ(MAX) - TA
PD(MAX)
=
θJA
Where TJ(MAX) is the maximum operation junction
temperature 125°C, TA is the ambient temperature and
the θJA is the junction to ambient thermal resistance.
For recommended operating conditions specification of
AAP2917, where TJ(MAX) is the maximum junction
temperature of the die (125°C) and TA is the maximum
ambient temperature. The junction to ambient thermal
resistance (θJA is layout dependent) only for SC-70
package is 330°C/W on standard thermal test board.
The maximum power dissipation at TA = 25°C can be
calculated by following formula :
PD(MAX)
=
125°C − 25°C / 330 = 300mW(SC − 70)
( )
The maximum power dissipation depends on operating
ambient temperature for fixed TJ(MAX) and thermal
resistance θJA.
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Packaging Information
SC-70
MILLIMETERS
INCHES
SYMBOLS
MIN.
0.80
MAX.
1.10
MIN.
0.031
0.001
0.006
MAX.
0.044
0.004
0.016
A
A1
b
0.025
0.15
0.10
0.40
D
E
2.00
1.25
0.079
0.049
E1
e
1.90
0.21
2.30
0.46
0.075
0.008
0.091
0.018
0.65
0.026
L
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SOT23-5
MILLIMETERS
INCHES
SYMBOL
S
MIN.
-
MAX.
1.30
MIN.
-
MAX.
0.052
0.006
A
A1
D
E1
E
0.00
0.15
0.000
2.90
1.60
0.114
0.063
2.60
0.30
0.30
3.00
0.60
0.50
0.102
0.012
0.118
0.024
0.020
L
b
0.012
e
0.95
0.037
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