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AME, Inc.
AME8826
1.55A CMOS LDO
! General Description
The AME8826 family of positive, linear regulators feature low quiescent current (45A typ.) with low dropout voltage, making them ideal for battery applications. Output voltages are set at the factory and trimmed to 1.5% accuracy. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. In applications requiring a low noise, regulated supply, place a 1000pF capacitor between Bypass and Ground. The AME8826 is stable with an output capacitance of 4.7F or greater.
! Functional Block Diagram
(Fixed Versions)
IN OUT
Overcurrent Shutdown
Thermal Shutdown
R1 BYPASS
AMP
EN
1.242V
R2 GND
! Features
" " " " " " " " " " " " Very Low Dropout Voltage Guaranteed 1.55A Output Accurate to within 1.5% 45A Quiescent Current Typically Over-Temperature Shutdown Current Limiting Noise Reduction Bypass Capacitor (Fixed Versions) Power-Saving Shutdown Mode Space-Saving DDPAK-5, SO-8 Package 6 Factory Pre-set Output Voltages Low Temperature Coefficient Adjustable Version
! Functional Block Diagram
(Adjustable Version)
IN OUT
Overcurrent Shutdown
Thermal Shutdown
AMP
EN ADJ
(external)
R1
1.242V
(external)
R2
GND
! Typical Application
IN
IN BYP GND OUT
OUT
! Applications
" " " " " Instrumentation Portable Electronics Wireless Devices PC Peripherals Battery Powered Widgets
C1 5V 1F C2 1nF
AME8826
EN
C3 4.7F
1
AME, Inc.
AME8826
1.55A CMOS LDO
! Pin Configuration
TO-263(DDPAK-5) Top View AME 8826AEDVxxx 1. EN 2. VIN 3. GND 4. VOUT 5. BYP TO-263(DDPAK-5) Top View AME8826BEDVADJ 1. EN 2. VIN 3. GND 4. VOUT 5. ADJ
AME8826
AME8826
1
2
3
4
5
1
2
3
4
5
SO-8 Top View
8 7 6 5
SO-8 Top View AME 8826AEHAxxx 1. BYP 2. GND 3. GND 4. EN 5. VIN 6. GND 7. GND 8. VOUT
8 7 6 5
AME8826
AME8826
AME 8826BEHAADJ 1. ADJ 2. GND 3. GND 4. EN 5. VIN 6. GND 7. GND 8. VOUT
1
2
3
4
1
2
3
4
SO-8 Top View
8 7 6 5
AME8826
1
2
3
4
AME 8826CEHAADJ 1. EN 2. VIN 3. VOUT 4. ADJ 5. GND 6. GND 7. GND 8. GND
2
AME, Inc.
AME8826
1.55A CMOS LDO
! Ordering Information
Part Number
AME8826AEDV150
Marking
AME8826 AEDV150 yyww AME8826 AEDV180 yyww AME8826 AEDV250 yyww AME8826 AEDV330 yyww AME8826 AEDV475 yyww AME8826 AEDV500 yyww AME8826 BEDVADJ yyww AME8826 AEHA150 yyww AME8826 AEHA180 yyww AME8826 AEHA250 yyww AME8826 AEHA330 yyww AME8826 AEHA475 yyww
Output Voltage
1.50
Package
DDPAK-5
Operating Temp. Range
- 40oC to + 85oC
AME8826AEDV180
1.80
DDPAK-5
- 40oC to + 85oC
AME8826AEDV250
2.50
DDPAK-5
- 40oC to + 85oC
AME8826AEDV330
3.30
DDPAK-5
- 40oC to + 85oC
AME8826AEDV475
4.75
DDPAK-5
- 40oC to + 85oC
AME8826AEDV500
5.00
DDPAK-5
- 40oC to + 85oC
AME8826BEDVADJ
ADJ
DDPAK-5
- 40oC to + 85oC
AME8826AEHA150
1.50
SO-8
- 40oC to + 85oC
AME8826AEHA180
1.80
SO-8
- 40oC to + 85oC
AME8826AEHA250
2.50
SO-8
- 40oC to + 85oC
AME8826AEHA330
3.30
SO-8
- 40oC to + 85oC
AME8826AEHA475
4.75
SO-8
- 40oC to + 85oC
3
AME, Inc.
AME8826
1.55A CMOS LDO
! Ordering Information (contd.)
Part Number
AME8826AEHA500
Marking
AME8826 AEHA500 yyww AME8826 BEHAADJ yyww AME8826 CEHAADJ yyww
Output Voltage
5.00
Package
SO-8
Operating Temp. Range
- 40oC to + 85oC
AME8826BEHAADJ
ADJ
SO-8
- 40oC to + 85oC
AME8826CEHAADJ
ADJ
SO-8
- 40oC to + 85oC
Please consult AME sales office or authorized Rep./Distributor for other output voltage and package type availability.
4
AME, Inc.
AME8826
1.55A CMOS LDO
! Absolute Maximum Ratings
Parameter
Input Voltage Output Current Output Voltage ESD Classification
Maximum
8 PD / (VIN - VO) GND - 0.3 to VIN + 0.3 B
Unit
V mA V
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
! Recommended Operating Conditions
Parameter
Ambient Temperature Range Junction Temperature
Rating
- 40 to + 85 - 40 to + 125
Unit
o o
C C
! Thermal Information
Parameter
Thermal Resistance (jc ) TO-263 (DDPAK-5) SO-8 TO-263 (DDPAK-5) SO-8
Maximum
5 20** 3.00 2.5 150 300
Unit
o
C/W
Internal Power Dissipation (PD ) ( T = 100oC)* Maximum Junction Temperature Maximum Lead Temperature (10 Sec)
W
o o
C C
* Assuming a heat sink capable of twice times (jc) ** Estimated
5
AME, Inc.
AME8826
1.55A CMOS LDO
! Electrical Specifications
TA = 25OC unless otherwise noted
Parameter Input Voltage Output Voltage Accuracy Dropout Voltage Output Current Current Limit Quiescent Current (For Fixed Output Voltage Options) Ground Pin Current Line Regulation Load Regulation Over Temerature Shutdown Over Temerature Hysterisis VO Temperature Coefficient ADJ Input Bias Current ADJ Reference Voltage Power Supply Rejection Symbol VIN VO VDROPOUT IO ILIM IQ IGND REGLINE REGLOAD OTS OTH TC IADJ VREF PSRR IO=100mA CO=4.7F ceramic IO=100mA Power Supply Rejection PSRR CO=4.7F ceramic CBYP=0.01F f=10Hz to 100kHz IO=10mA,CBYP=0F f=10Hz to 100kHz IO=10mA,CBYP=0.01F f=1kHz f=10kHz f=100kHz f=1kHz f=10kHz f=100kHz Co=4.7F Co=4.7F 2.0 0 IO=1mA VIN=VO+1 to VO+2 IO=1.55A VO=VO(NOM) -2.0% IO=1mA 1.5V<=VO(NOM)<=2.0V 2.0Vo o
Units V % mV
VO>1.2V VO>1.2V IO=0mA IO=1mA to 1.5A VO < 2.0V VO >= 2.0V IO=1mA to 1.5A
C C
ppm/oC A V
Output Voltage Noise Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current
eN eN VEH VEL IEH IEL ISD
VIN=2.7V to 7V VIN=2.7V to 7V VEN=VIN, VIN=2.7V to 7V VEN=0V, VIN=2.7V to 7V VIN=5.0V, VO=0V, VENNote1:VIN(min)=VOUT+VDROPOUT
6
AME, Inc.
AME8826
1.55A CMOS LDO
! Detailed Description
The AME8826 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. The P-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over-current and Thermal shutdown circuits become active when the junction temperature exceeds 140oC, or the current exceeds 2.2A. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120oC.
! Enable
When pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 1A. This pin behaves much like an electronic switch.
! Adjustable Version
The adjustable version uses external feedback resistors to generate an output voltage anywhere from 1.5V to 5.0V. Vadj is trimmed to 1.242V and VOUT is given by the equation:
VOUT = Vadj ( 1 + R1 / R2 )
Feedback resistors R1 and R2 should be high enough to keep quiescent current low, but increasing R1 + R2 will reduce stability. In general, R1 and R2 in the 10s of k will produce adequate stability, given reasonable layout precautions. To improve stability characteristics, keep parasitics on the ADJ pin to a minimum, and lower R1 and R2 values.
! External Capacitors
The AME8826 is stable with an output capacitor to ground of 4.7F or greater. Ceramic capacitors have the lowest ESR, and will offer the best AC performance. Conversely, Aluminum Electrolytic capacitors exhibit the highest ESR, resulting in the poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. One option is to parallel a 0.1F ceramic capacitor with a 10F Aluminum Electrolytic. The benefit is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be at least 0.1F to have a beneficial effect. A third capacitor can be connected between the BYPASS pin and GND. This capacitor can be a low cost Polyester Film variety between the value of 0.001 ~ 0.01F. A larger capacitor improves the AC ripple rejection, but also makes the output come up slowly. This "Soft" turn-on is desirable in some applications to limit turn-on surges. All capacitors should be placed in close proximity to the pins. A "Quiet" ground termination is desirable. This can be achieved with a "Star" connection.
7
AME, Inc.
AME8826
1.2
1.55A CMOS LDO
Dropout Voltage VS ILOAD
VOUT=1.5
0.8
1
Dropout Voltage VS VOUT
ILOAD=1.5A
1
Dropout Voltage (V)
0.8
1.8 2.0 2.1
Dropout Voltage (V)
0.6
0.6
0.4
ILOAD=1.0A ILOAD=0.5A
0.4
2.8 3.3
0.2
0.2
0
0 0 0.3 0.6 0.9 1.2 1.5 1.8
0
2
4
6
8
ILOAD (A)
VOUT (V)
Quiescent Current vs. Temperature
41
50 45
Ground Current vs. VIN
Quiescent Current @ 5V (uA)
39 37 35 33 31 29 27 25
Ground Current (A)
40 35 30 25 20 15 10
IOUT = 140mA VOUT = 1.5V
-45
-5
25
55
o
85
115
2
3
4
5
6
7
8
Temperature ( C)
VIN (V)
Ground Current vs. Load Current
38.5 38 3 2.8 2.6 37.5 37 36.5 36 35.5 35 34.5
Current Limit vs. VIN
CIN = 4.7F COUT = 4.7F VOUT = 1.8V
Ground Current (A)
VIN = 2.5V VOUT = 1.5V
Current Limit (A)
1.5
2.4 2.2 2 1.8 1.6 1.4 1.2
0
0.25
0.5
0.75
1
1.25
1 2 3 4 5 6 7 8
Load Current (mA)
VIN (V)
8
AME, Inc.
AME8826
Load Regulation vs. Temperature
0.30 400
1.55A CMOS LDO
Dropout Voltage vs. Load Current(2.5V)
Dropout Voltage @1.5A (mV)
350 300 250 200 150 100 50 0
0.25
Load Regulation (%)
115 o C 85 oC 55 oC 25 oC -5 oC -45 oC
0.20
0.15
0.10
0.05 0.00 -45
-5
25
55
85
115
0.3
0.6
0.9
1.2
1.5
Temperature (oC)
Load Current (A)
AME8826CEHAADJ vs. Temperature
1.244
Line Transient Response
VOUT (50mV/DIV)
1.243 1.242
VADJ (V)
1.241 1.240 1.239
1.237 1.236 1.235 -45 -5 25 55 85 115
VIN (2V/DIV)
1.238
CIN = 4.7F COUT = 4.7F TR = TF = 1S VOUT = 1.5V
0V Time (20mS/DIV)
Temperature (oC)
Load Step 40mA to 1.5A
ILoad 1A/DIV
Current Limit Response
VOUT 1V/DIV VIN = 5V CIN = 4.7F COUT = 4.7F
0A CIN = 4.7F COUT = 4.7F VIN = 4.0V VOUT = 1.8V
VOUT 10mV/DIV
0V ILOAD 1A/DIV ILIM ISC 0A
Time 500S/DIV
Time 1mS/DIV
9
AME, Inc.
AME8826
Overtemperature Shutdown
10000
1.55A CMOS LDO
Stability vs. ESR vs. ILoad
Unstable Region
1000 100
IOUT 1A/DIV
CLESR ( )
VOUT 1V/DIV
VIN = 4V CIN = 4.7F COUT = 4.7F
0A
CL=5F
10
1 0.1
Stable Region
0V
0.01
Untested Region
0 250 500 750 1000 1250 1500
Time 100mS/DIV
ILOAD (mA)
Stability vs. ESR vs. ILoad
10000 1000 100 10000
Stability vs. ESR vs. ILoad
1000
Unstable Region CL=2F
Unstable Region
100
CLESR ( )
10
CLESR ( )
10 1 0.1 0.01
CL=10F
1 0.1 0.01 0
Stable Region
Stable Region
Untested Region
250 500 750 1000 1250 1500
0.001 0
Untested Region
250 500 750 1000 1250 1500
ILOAD (mA)
ILOAD (mA)
10
AME, Inc.
AME8826
1.55A CMOS LDO
! External Resistor Divider Table
R1 (K Ohm) Vout 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 21.41 11.50 7.86 5.97 4.81 4.03 3.47 3.04 2.71 2.44 2.23 2.04 1.89 1.75 1.64 1.54 1.45 1.37 1.30 1.23 1.17 1.12 1.07 1.03 0.99 0.95 0.91 0.88 0.85 0.82 0.80 0.77 0.75 0.73 0.71 0.69 0.67 42.83 23.00 15.72 11.94 9.63 8.06 6.94 6.09 5.42 4.89 4.45 4.09 3.78 3.51 3.28 3.07 2.90 2.74 2.59 2.46 2.35 2.24 2.15 2.06 1.97 1.90 1.83 1.76 1.70 1.65 1.59 1.54 1.50 1.45 1.41 1.37 1.34 1 2 5 10 20 50 100 200 500 1000
R2(kohm)=(1.242*R1(kohm))/(Vout-1.242) 107.07 57.50 39.30 29.86 24.07 20.16 17.35 15.22 13.56 12.22 11.13 10.21 9.44 8.77 8.19 7.69 7.24 6.84 6.48 6.16 5.87 5.60 5.36 5.14 4.94 4.75 4.57 4.41 4.26 4.12 3.99 3.86 3.75 3.64 3.53 3.43 3.34 214.14 115.00 78.61 59.71 48.14 40.32 34.69 30.44 27.12 24.45 22.26 20.43 18.88 17.54 16.39 15.37 14.48 13.68 12.96 12.32 11.74 11.21 10.73 10.28 9.87 9.50 9.15 8.82 8.52 8.24 7.97 7.72 7.49 7.27 7.06 6.87 6.68 428.28 230.00 157.22 119.42 96.28 80.65 69.39 60.88 54.24 48.90 44.52 40.86 37.75 35.08 32.77 30.74 28.95 27.36 25.93 24.64 23.48 22.42 21.45 20.56 19.75 18.99 18.29 17.64 17.04 16.47 15.94 15.45 14.98 14.54 14.13 13.74 13.37 1070.69 575.00 393.04 298.56 240.70 201.62 173.46 152.21 135.59 122.24 111.29 102.14 94.38 87.71 81.93 76.86 72.38 68.39 64.82 61.61 58.70 56.05 53.63 51.41 49.36 47.48 45.73 44.11 42.59 41.18 39.86 38.62 37.45 36.36 35.32 34.35 33.42
597.55 481.68 403.44 347.07 304.52 271.27 244.56 222.64 204.33 188.80 175.46 163.88 153.74 144.78 136.81 129.67 123.23 117.41 112.11 107.27 102.83 98.74 94.97 91.47 88.22 85.19 82.37 79.73 77.25 74.92 72.72 70.65 68.70 66.85
962.79 806.49 693.85 608.82 542.36 488.98 445.16 408.55 377.51 350.85 327.70 307.43 289.51 273.57 259.29 246.43 234.78 224.19 214.51 205.63 197.46 189.91 182.92 176.42 170.37 164.72 159.44 154.48 149.82 145.43 141.30 137.39 133.69
877.12 819.26 768.56 723.78 683.92 648.23 616.07 586.96 560.47 536.27 514.07 493.64 474.77 457.29 441.05 425.93 411.80 398.59 386.19 374.55 363.58 353.24 343.47 334.23
914.58 882.10 851.85 823.61 797.18 772.39 749.10 727.17 706.48 686.95 668.46
11
AME, Inc.
AME8826
1.55A CMOS LDO
! External Resistor Divider Table (contd.)
R1 (K Ohm) Vout 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.55 3.60 3.65 3.70 3.75 3.80 3.85 3.90 3.95 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 4.45 4.50 4.55 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 0.65 0.63 0.62 0.60 0.59 0.58 0.56 0.55 0.54 0.53 0.52 0.51 0.50 0.49 0.48 0.47 0.46 0.45 0.44 0.43 0.43 0.42 0.41 0.41 0.40 0.39 0.39 0.38 0.38 0.37 0.36 0.36 0.35 0.35 0.34 0.34 0.33 0.33 1.30 1.27 1.24 1.21 1.18 1.15 1.13 1.10 1.08 1.05 1.03 1.01 0.99 0.97 0.95 0.93 0.92 0.90 0.88 0.87 0.85 0.84 0.83 0.81 0.80 0.79 0.77 0.76 0.75 0.74 0.73 0.72 0.71 0.70 0.69 0.68 0.67 0.66 3.25 3.17 3.09 3.02 2.95 2.88 2.81 2.75 2.69 2.63 2.58 2.53 2.48 2.43 2.38 2.34 2.29 2.25 2.21 2.17 2.14 2.10 2.06 2.03 2.00 1.97 1.94 1.91 1.88 1.85 1.82 1.80 1.77 1.75 1.72 1.70 1.67 1.65 1 2 5 10 20 50 100 200 500 1000
R2(kohm)=(1.242*R1(kohm))/(Vout-1.242) 6.51 6.34 6.19 6.03 5.89 5.76 5.63 5.50 5.38 5.27 5.16 5.05 4.95 4.86 4.76 4.67 4.59 4.50 4.42 4.35 4.27 4.20 4.13 4.06 4.00 3.93 3.87 3.81 3.75 3.70 3.64 3.59 3.54 3.49 3.44 3.40 3.35 3.30 13.02 12.69 12.37 12.07 11.78 11.51 11.25 11.00 10.76 10.53 10.32 10.11 9.90 9.71 9.52 9.35 9.17 9.01 8.85 8.69 8.54 8.40 8.26 8.12 7.99 7.87 7.74 7.62 7.51 7.40 7.29 7.18 7.08 6.98 6.88 6.79 6.70 6.61 32.55 31.72 30.93 30.17 29.46 28.78 28.13 27.50 26.91 26.34 25.79 25.26 24.76 24.28 23.81 23.36 22.93 22.52 22.12 21.73 21.35 20.99 20.64 20.31 19.98 19.66 19.36 19.06 18.77 18.49 18.22 17.96 17.70 17.45 17.21 16.98 16.75 16.52 65.09 63.43 61.85 60.35 58.92 57.55 56.25 55.00 53.81 52.67 51.58 50.53 49.52 48.55 47.62 46.73 45.86 45.03 44.23 43.46 42.71 41.99 41.29 40.61 39.96 39.33 38.72 38.12 37.55 36.99 36.44 35.92 35.40 34.91 34.42 33.95 33.50 33.05 130.19 126.86 123.71 120.70 117.84 115.11 112.50 110.01 107.63 105.34 103.16 101.06 99.04 97.11 95.25 93.45 91.73 90.07 88.46 86.91 85.42 83.98 82.58 81.23 79.92 78.66 77.43 76.24 75.09 73.97 72.89 71.83 70.81 69.81 68.85 67.91 66.99 66.10 325.47 317.16 309.26 301.75 294.59 287.77 281.25 275.02 269.06 263.36 257.89 252.64 247.61 242.77 238.11 233.63 229.32 225.16 221.15 217.28 213.55 209.94 206.45 203.07 199.81 196.64 193.58 190.61 187.73 184.93 182.22 179.58 177.02 174.54 172.12 169.76 167.48 165.25 650.94 634.32 618.53 603.50 589.18 575.53 562.50 550.04 538.13 526.72 515.78 505.29 495.22 485.54 476.23 467.27 458.64 450.33 442.31 434.57 427.10 419.88 412.90 406.15 399.61 393.29 387.16 381.22 375.45 369.86 364.44 359.17 354.05 349.07 344.24 339.53 334.95 330.49
Note: Small load(greater than 2 mA) is necessary as R1 or R2 is larger than 50 K Ohm. Otherwise, outputvoltage probably cannot be pulled down to 0 V on disable mode.
12
AME, Inc.
AME8826
1.55A CMOS LDO
! Package Dimension
SO-8
Top View Side View C
SYMBOLS A A A2 B C D
MILLIMETERS MIN
1.35 0.10 0.33 0.19 4.80 3.80 0.40 0
o
INCHES MIN
0.05315
MAX
1.75 0.25 0.51 0.25 5.00 4.00 1.27 0.10 8
o
MAX
0.0689
0.00394 0.00984 0.058 REF 0.01299 0.02008 0.00748 0.00984 0.18898 0.19685 0.14961 0.15748 0.050 BSC 0.01575 0
o
E
1.473 REF
D ? Front View
7o(4X)
L
E e L y e
1.27 BSC
0.05 0.004 8o
A2 B
TO-263-5
Top View A K Side View E
A1
e
A
SYMBOLS A B C D E G H K L N P R W
MILLIMETERS MIN
10.050 8.280 4.310 0.660 1.140 14.605 1.143 0.000 0.330 2.280
INCHES MIN
0.396 0.326 0.170 0.026 0.045 0.575 0.045 0.000 0.013 0.090
MAX
10.668 9.169 4.597 0.910 1.400 15.875 1.680 0.305 0.580 2.800
MAX
0.420 0.361 0.181 0.036 0.055 0.625 0.066 0.012 0.023 0.110
B
H
1.70REF
0.067 REF
P W D Front View C G N R
0o 8o 0.25REF
0o 8o 0.01REF
13
Life Support Policy: These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. (c) AME, Inc. , September 2003 Document: 2006-DS8803/8814-G
E-Mail:Longman@rccn.com.cn
Address:Room 2101, No.2 Building Yulan garden, No.50 Puhuitang Rd,Shanghai,PRC zip:200030 Tel : 86-21-64285731/32 ext:8033 Fax: 86-21-64393342 Sales Manager:Longman Xu

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