AAP2967 [ETC]
300mA Low-Noise Low-Dropout Linear Regulator; 300mA低压噪声低压降线性稳压器
| 型号： | AAP2967 |
| 厂家： | 
ETC |
| 描述： | 300mA Low-Noise Low-Dropout Linear Regulator |
| 文件： | 总9页 (文件大小：198K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
芯美 子
AAP2967
300mA Low-Noise Low-Dropout
Linear Regulator
DESCRIPTION
FEATURE
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300mA Guaranteed Output Current
65dB PSRR at 1kHz
The AAP2967 low-noise, low-dropout, linear
regulator operates from a 2.5V to 5.5V input and is
guaranteed to deliver 300mA.
Low Noise Output
150mV Dropout at 300mA Load
Low 84µA No-Load Supply Current
≤ 1µA Shutdown Current
The AAP2967 is stable with small 2.2µF ceramic
capacitor. Its performance suits battery powered
applications because of its shutdown mode, low
quiescent current, and very low dropout voltage. The
low dropout voltage allows for more utilization of a
battery’s available energy by operating closer to its
end-of-life voltage.
Stable With 2.2µF Ceramic Output Capacitors
Thermal Shutdown and Short-Circuit Protection
SOT23-5 Package
RoHS Compliant and 100% Lead (Pb)-Free
APPLICATIONS
The AAP2967 is available in 1.5V,1.8V,2.5V, 2.8V,
3V ,3.3V and Adjustable versions.
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Wireless Handsets
DSP Core Power
Battery Powered Electronics
Portable Information Appliance
Block Diagram
Figure1.
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Typical Application Circuit
AAP2967
Figure2. Fixed-Voltage LDO Regulator
Pin Configurations
Package Type
Pin Configurations
SOT23-5
Fixed-Voltage
Adjustable Voltage
Pin Description
PIN
1
NAME
VIN
DESCRIPTION
Input voltage of the LDO
Common Ground
2
GND
3
places the entire device in shutdown mode when held low
SHDN
SHDN
BP
ADJ
VOUT
Compensation capacitor for noise reduction
Adjustable regulator feedback input. Connect to resistor divider.
Output voltage of the LDO
4
5
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AAP2967
Ordering Information
Order Number
AAP2967-12VIR1
AAP2967-15VIR1
AAP2967-18VIR1
AAP2967-25VIR1
AAP2967-28VIR1
AAP2967-30VIR1
AAP2967-33VIR1
AAP2967VIR1
Package Type
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SOT23-5
Marking
Operating Temperature range
-40°C to 85°C
hT □ □ □ □
h0 □ □ □ □
h1 □ □ □ □
h2 □ □ □ □
h6 □ □ □ □
h5 □ □ □ □
h3 □ □ □ □
hA □ □ □ □
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
AAP2967 □ □
□
□
□
□
Lead Free Code
1: Lead Free 0: Lead
Packing
R: Tape & Reel
Operating temperature range
I: Industry Standard
C: Commercial
Package Type
V: SOT23
Output Voltage
12: 1.2V
15: 1.5V
18: 1.8V
25: 2.5V
28: 2.8V
30: 3.0V
33: 3.3V
Black: Adjustable
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AAP2967
Absolute Maximum Ratings
VIN,VEN --------------------------------------------------------------------------------- -0.3 to 6V
VOUT ------------------------------------------------------------------- -0.3 to (VIN+0.3) ≤ 6V
Junction Temperature ------------------------------------------------------------------- 150°C
Storage Temperature ------------------------------------------------------ -65°C to +150°C
Lead Temp ------------------------------------------------------------------------------
Pad Temp -------------------------------------------------------------------------------
235°C
235°C
Maximum Power Dissipation SOT23-5 -------------------------------------------- 364mW
Thermal Resistance θJA(SOT23-5) ------------------------------------------------- 220°C/W
ESD Rating
Human Body Model -------------------------------------------------------------------
2kV
Operating Ratings
VIN -------------------------------------------------------------------------------------- 2.5 to 5.5V
VEN ------------------------------------------------------------------------- 0 to (V +0.3) 5.5V
Junction Temperature -------------------------------------------------------- -40°C to +125°C
≤
IN
Electrical Characteristics
Unless otherwise specified, all limits guaranteed for VIN= VO +0.5V, VSHDN=VIN, CIN=COUT=2.2µF, CBP=10nF,
TA =25°C.
AAP2967
Symbol
Parameter
Conditions
Unit
Min
Typ
Max.
100µA ≤ IOUT ≤ 300mA
% of
∆ VO Output Voltage Tolerance
-3
+3
VIN=VO+0.5V,
VOUT(NOM)
IO
Maximum Output Current
Continuous
300
350
mA
mA
µA
µA
mV
ILIMIT Output Current Limit
Supply Current
TA = -40°C to 85°C
IOUT=0mA
720
84
140
1
200
0.2
35
IQ
Shutdown Supply Current
VO =0V, SHDN =GND
IOUT =300mA
VDO Dropout Voltage
150
0.05
15
IOUT = 1mA, (VO +0.5V)≤ VI
Line Regulation
%/V
mV
≤ 5.5V
∆ VO
Load Regulation
1mA ≤ IOUT ≤ 300mA
IOUT =10mA, 10Hz ≤ f
en
Output Voltage Noise
50
µVRMS
≤ 100kHz
VIH,(VO+0.5V) ≤ VI ≤ 5.5V
VIL,(VO+0.5V) ≤ VI ≤ 5.5V
1.6
V
VSHDN
ISHDN
SHDN Input Threshold
0.4
100
0.1
1
nA
nA
V
SHDN Input Bias Current
FB Input Bias Current
(ADJ Version)
FB Pin Voltage (ADJ Version)
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
SHDN =GND or IN
VIN=5.5V, VFB=1.3V
TA=25℃
VFB
TSD
1.176
1.2
160
20
1.224
°C
dB
PSRR Power Supply Rejection Ratio
VIN=VOUT+1V, f=1kHZ
65
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Typical Operating Characteristics
AAP2967
Output Voltage vs. Input voltage
Output Voltage vs. Temperature(oC)
3.06
3.04
3.02
3.00
2.98
2.96
2.94
3.020
25oC
3.015
ILOAD=1mA
125oC
3.010
3.005
3.000
-40oC
3.5
4.0
4.5
5.0
5.5
6.0
-60 -40 -20
0
20 40 60 80 100 120 140
Temperature(oC)
Input Voltage (V)
Quiescent Current vs. Temperature
Dropout Voltage vs. Output Current
240
120
110
100
90
220
200
180
160
140
120
100
80
125oC
25oC
80
-40oC
60
70
40
60
20
0
-20
50
-60 -40 -20
0
20 40 60 80 100 120 140
0
50
100
150
200
250
300
Temperature (oC)
Output Current (mA)
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AAP2967
Typical Operating Characteristics (continued)
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AAP2967
Application Information
Noise Bypass Capacitor
External Capacitors
An external 10nF bypass capacitor at BP pin conjunction
with an internal resistor creates lowpass filter. Increasing
the capacitance will decrease the output noise. 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.
Unlike many other LDO’s , addition of a noise reduction
capacitor does not effect the load transient response of
the device. However, it does affect start-up time. The
smaller the capacitance value, the quicker the start-up
time.
Like any low-dropout regulator, the AAP2967 requires
external capacitors for regulator stability. The AAP2967
is specifically designed for portable applications
requiring minimum board space and smallest components.
These capacitors must be correctly selected for good
performance.
Input Capacitor
A minimum input capacitance of 1µF is required between
the AAP2967 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.
Power Dissipation and Junction Temperature
Specified regulator operation is assured to a junction
temperature of 125°C; the maximum junction
temperature should be restricted to 125°C under normal
operating conditions. This restriction limits the power
dissipation the regulator can handle in any given
application. To ensure the junction temperature is within
acceptable limits, calculate the maximum allowable
dissipation, PD(max), and the actual dissipation, PD, which
must be less than or equal to PD(max)
No-Load Stability
The AAP2967 will remain stable and in regulation with
no external load. This is specially important in CMOS
RAM keep-alive applications.
Output Capacitance
The maximum-power-dissipation limit is determined
using the following equation:
The AAP2967 is specifically designed to employ ceramic
output capacitors as low as 2.2µF. Ceramic capacitors
below 10µF offer significant cost and space savings,
along with high frequency noise filtering. Higher values
and other types and of capacitor may be used, but their
equivalent series resistance (ESR) should be maintained
below 0.5Ω. Ceramic capacitor of the value required by
the AAP2967 are available in the following dielectric
types: Z5U, Y5V, X5R, and X7R. The Z5U and Y5V
types exhibit a 50% or more drop in capacitance value as
their temperature increase from 25°C, an important
consideration. The X5R generally maintain their
capacitance value within ± 20%. The X7R type are
desirable for their tighter tolerance of 10% over
temperature.
T max − T
J
=
A
P
D(max)
R
θJA
Where:
JMAX is the maximum allowable junction temperature.
T
R
θJA is the thermal resistance junction-to-ambient for the
package
TA is the ambient temperature.
The regulator dissipation is calculated using:
P
=
V − V
×I
D
I
O
O
Power dissipation resulting from quiescent current is
negligible. Excessive power dissipation triggers the
thermal protection circuit.
Shutdown
The AAP2967 goes into sleep mode when the
SHDN
pin is in a logic low condition. During this condition, the
pass transistor, error amplifier, and bandgap are turned
off, reducing the supply current to 60nA typical. The
pin may be directly tied to VIN to keep the part
SHDN
on.
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AAP2967
Adjustable Operation
The adjustable version of the AAP2967 has an output
voltage range of 1.2V to 4.5V. The output voltage of the
AAP2967 adjustable regulator is programmed using an
external resistor divider as shown in Figure3. The output
voltage is calculated using:
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:
V
1.2V
O
R = R
−1
2
1
Choose R2=50k to optimize accuracy, power supply
rejection, noise and power consumption.
Figure3. Adjustable Regulator with Resistors
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AAP2967
Packaging Information
SOT23-5
MILLIMETERS
INCHES
SYMBOLS
MIN.
-
0.00
MAX.
1.30
0.15
MIN.
-
0.000
MAX.
0.052
0.006
A
A1
D
E1
E
L
b
2.90
1.60
0.114
0.063
2.60
0.30
0.30
3.00
0.60
0.50
0.102
0.012
0.012
0.118
0.024
0.020
e
0.95
0.037
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