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AME, Inc.
AME8844
750mA CMOS LDO
n General Description
The AME8844 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. An additional feature is a "Power Good" detector, which pulls low when the output is out of regulation. The AME8844 is stable with an output capacitance of 4.7F or greater.
n Functional Block Diagram
(Fixed Versions)
IN
Overcurrent Shutdown
OUT
Thermal Shutdown
EN Vref x115% PG
R1
AMP
R2 Vref x85% Vref
n Features
l l l l l l l l l l l l l l Very Low Dropout Voltage Guaranteed 750mA Output Accurate to within 1.5% 45A Quiescent Current Typically Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Noise Reduction Bypass Capacitor (Fixed Versions) Power-Saving Shutdown Mode Space-Saving MSOP-8 Package 6 Factory Pre-set Output Voltages Low Temperature Coefficient Adjustable Version Power Good Output Function.
GND
n Functional Block Diagram
(Adjustable Version)
IN OUT
Overcurrent Shutdown
Thermal Shutdown
AMP
R1 EN ADJ
(external)
1.242V
R2
(external)
GND
n Typical Applications
IN
IN OUT
n Applications
l l l l l Instrumentation Portable Electronics Wireless Devices PC Peripherals Battery Powered Widgets
OUT
AME8844
PG GND EN
C1 5V 1F
C3 4.7F
1
AME, Inc.
AME8844
750mA CMOS LDO
n Pin Configuration
MSOP-8 Top View
8 7 6 5
MSOP-8 Top View AME 8844AEQAxxx 1. EN 2. VIN 3. 4. 5. 6. 7. 8. PG VOUT GND GND GND GND
8 7 6 5
8844 Xyww
8844 Byww
1
2
3
4
1
2
3
4
AME 8844BEQAADJ 1. EN 2. VIN 3. ADJ 4. VOUT 5. GND 6. GND 7. GND 8. GND
Note: X: represents the regulator output voltage. yww: represents the date code. Please contact AME for details.
n Ordering Information AME8844 AEQA xxx
Voltage 150: V=1.5V 180: V=1.8V 250: V=2.5V 330: V=3.3V Pin Out Types [Package Type] Q:MSOP-8 [Pin Count] A:8
AME8844 BEQA ADJ
Voltage ADJ: Adjustable
Pin Out Types [Package Type] Q:MSOP-8 [Pin Count] A:8
Operating Temperature E:-40oC to 85oC
Operating Temperature E:-40oC to 85oC
2
AME, Inc.
AME8844
750mA CMOS LDO
n Ordering Information (contd.)
Part Number
AME8844AEQA150
Marking
8844 Lyww 8844 Myww 8844 Dyww 8844 Ayww 8844 Byww
Output Voltage
1.50
Package
MSOP-8
Operating Temp. Range
- 40oC to + 85oC
AME8844AEQA180
1.80
MSOP-8
- 40oC to + 85oC
AME8844AEQA250
2.50
MSOP-8
- 40oC to + 85oC
AME8844AEQA330
3.30
MSOP-8
- 40oC to + 85oC
AME8844BEQAADJ
ADJ
MSOP-8
- 40oC to + 85oC
Note: ww represents the date code Please consult AME sales office or authorized Rep./Distributor for other output voltage and package type availability.
3
AME, Inc.
AME8844
750mA CMOS LDO
n Absolute Maximum Ratings
Parameter
Input Voltage Output Current Output Voltage ESD Classification
Maximum
8
Unit
V mA V
PD / (VIN - VO)
GND - 0.3 to V IN + 0.3 B
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
n Recommended Operating Conditions
Parameter
Ambient Temperature Range Junction Temperature
Rating
- 40 to + 85 - 40 to + 125
Unit
o
C C
o
n Thermal Information
Parameter
Thermal Resistance (jc ) Internal Power Dissipation (PD ) ( T = 100oC)* Maximum Junction Temperature Maximum Lead Temperature (10 Sec) MSOP-8 MSOP-8 150 300
Maximum
80
Unit
o
C/W W
o
C C
o
* Assuming a heat sink capable of twice times (jc) ** Estimated
4
AME, Inc.
AME8844
750mA CMOS LDO
n Electrical Specifications
VIN = VO(NOM) +2V, VEN = VIN, TA = 25OC unless otherwise noted
Parameter Input Voltage Output Voltage Accuracy Dropout Voltage Output Current Current Limit Short Circuit Current Quiescent Current Ground Pin Current Line Regulation Load Regulation Over Temerature Shutdown Over Temerature Hysterisis V O Temperature Coefficient ADJ Input Bias Current Minimum Load Current ADJ Reference Voltage Power Supply Rejection Symbol VIN VO VDROPOUT IO ILIM ISC IQ IGND REGLINE REGLOAD OTS OTH TC IADJ Iload V REF PSRR IO=100mA CO=4.7F ceramic f=10Hz to 100kHz IO=10mA IO=750mA Test Condition IO=1mA VO(NOM)=1.5V VO(NOM)=1.8V VO=VONOM -2.0% VO(NOM)>=2.0V VO>1.2V VO>1.2V VIN =VO(NOM) +1V, V O < 0.4V IO=0mA IO=1mA to 750mA V O < 2.0V IO=1mA 4.0 > VO >= 2.0V V IN =VO+1 to VO+2 4.0V <= VO IO=1mA to 750mA Min Note 1 -1.5 Typ Max Units V % mV mA mA mA A A % % % % C C ppm/ oC A A V
o o
7 1.5 1000 See 650 chart 500
750 750 750 45 45 -0.15 -0.1 -0.4 -1 0.02 0.2 150 30 30 1 70 0.15 0.1 0.4 1
Vin = 2.5V f=1kHz f=10kHz f=100kHz Co=4.7F
70 1.221 1.240 1.26 75 55 30 30 2.0 0
dB
Output Voltage Noise EN Input Threshold EN Input Bias Current Shutdown Supply Current Output Under Voltage Output Over Voltage PG Leakage Current PG Voltage Low
eN VEH V EL IEH IEL ISD VUV
VOV ILC
Vrms Vin V 0.4 V 1 A 1 A 2 A 84 %V O(NOM) %V O(NOM)
1 A
V IN =2.7V to 7V V IN =2.7V to 7V VEN =VIN , V IN =2.7V to 7V VEN =0V, VIN =2.7V to 7V VIN =5V, VO=0V, VEN VPG=7V
0.5
105
V OL
ISINK=0.25mA
0.4
V
Note1:VIN(min)=VOUT+VDROPOUT
5
AME, Inc.
AME8844
750mA CMOS LDO
n Detailed Description
The AME8844 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. The AME8844 behaves like a current source when the load reaches 2.2A. However, if the load impedance drops below 0.3 ohms, the current drops back to 600mA to prevent excessive power dissipation. Normal operation is restored when the load resistance exceeds 0.75 ohms.
n Enable
When EN pin is pulled low, the PMOS pass transistor shuts off, and all internal circuits are powered down. In this state, the quiescent current is less than 2A. This pin behaves much like an electronic switch. 100K Ohm resistor is necessary between VEN source and EN pin when VEN is higher than VIN.
(Note: There is no internal pull-up for EN pin. It can not be floating)
n 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 1.24V and VOUT is given by the equation:
n External Capacitors
The AME8844 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. 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.
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 10's 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.
n Power Good
The AME8844 includes the Power Good feature. When the output is not within 15% of the specified voltage, it pulls low. This can occur under the following conditions: 1) 2) 3) 4) Input Voltage too low. During Over-Temperature. During Over-Current. If output is pulled up.
(Note: PG pin is an open-drain output.)
6
AME, Inc.
AME8844
Dropout Voltage VS ILOAD
1 .2 1 1
750mA CMOS LDO
Dropout Voltage VS VOUT
I L O A D =1.5A
0 .8
V O U T =1.5 Dropout Voltage (V)
Dropout Voltage (V)
0 .8
1.8 2.0
0 .6
0 .6
2.1
0 .4
I L O A D =1.0A
0 .4
2.8 3.3
I L O A D =0.5A
0 .2
0 .2
0 0 0 .3 0 .6 0 .9 1 .2 1 .5 1 .8
0 0 2 4 6 8
I LO AD (A)
V O U T (V)
Quiescent Current vs. Temperature
50 41
Ground Current vs. VIN
Quiescent Current @ 5V (uA)
39 37 35 33 31 29 27 25 -4 5 -5 25 55
o
45
Ground Current (A)
40 35 30 25 20 15 10
IOUT = 140mA VOUT = 1.5V
85
115
2
3
4
5
6
7
8
Tem perature ( C)
VIN (V)
Ground Current vs. Load Current
38.5 38 2 .5 0 0
VOUT vs. Temperature(2.5V)
Ground Current (A)
37 36.5 36 35.5 35 34.5 0 0.25 0.5 0.75
VIN = 2.5V VOUT = 1.5V
Output Voltage (V)
37.5
2 .4 9 5
2 .4 9 0
2 .4 8 5
2 .4 8 0
1
1.25
1.5
2 .4 7 5 -4 5
-5
25
55
85
115
Load Current (mA)
Tem perature ( o C)
7
AME, Inc.
AME8844
Load Regulation vs. Temperature
0 .3 0
750mA CMOS LDO
Dropout Voltage vs. Load Current(2.5V)
400
0 .2 5
Dropout Voltage @1.5A (mV)
350 300 250 200 150 100 50 0
Load Regulation (%)
115 oC 85 oC 55 oC 25 oC -5 oC -45 oC
0 .2 0
0 .1 5
0 .1 0
0 .0 5 0 .0 0 -4 5
-5
25
55
85
115
0.3
0.6
0.9
1.2
1.5
Temperature ( o C)
Load Current (A)
AME8844BEQA VADJ vs. Temperature
1 .2 4 4 1 .2 4 3 1 .2 4 2
Line Transient Response
VOUT (50mV/DIV)
VADJ (V)
1 .2 4 1 1 .2 4 0 1 .2 3 9 1 .2 3 8 1 .2 3 7 1 .2 3 6 1 .2 3 5
VIN (2V/DIV)
C IN = 4.7F C O U T = 4.7F T R = T F = 1S V O U T = 1.5V
-4 5
-5
25
55
85
115
0 Tim e (20m S/DIV)
Tem perature ( o C)
Load Step 40mA to 1.5A
ILoad 1A/DIV VOUT 1V/DIV
Current Limit Response
V IN = 5V C IN = 4.7F C O U T = 4.7F
0 C IN = 4.7F C O U T = 4.7F V IN = 4.0V V O U T = 1.8V
VOUT 10mV/DIV
0V ILOAD 1A/DIV I L IM IS C 0A
Tim e 500 S/DIV
Tim e 1m S/DIV
8
AME, Inc.
AME8844
Current Limit vs. VIN
3 2 .8 2 .6 1 .6
750mA CMOS LDO
Short Circuit Current vs. VIN
Short Circuit Current (A)
1 .4 1 .2 1 0 .8 0 .6 0 .4 0 .2 0
Current Limit (A)
2 .4 2 .2 2 1 .8 1 .6 1 .4 1 .2 1 2
C IN = 4.7F C O U T = 4.7F V O U T = 1.8V
C IN = 4.7F C O U T = 4.7F
3
4
5
6
7
8
2
3
4
5
6
7
8
V IN (V)
V IN (V)
Overtemperature Shutdown
10000
Stability vs. ESR vs. ILoad
U nstable R egion
1000
IOUT 1A/DIV
0A CLESR ( ) V IN = 4V C IN = 4.7F C O U T = 4.7F
100
C L =5F
10
VOUT 1V/DIV
1
S table R egion
0V
0 .1
0 .0 1 0 250
U ntested R egion
500 750 1000 1250 1500
Tim e 100m S/DIV
ILO AD (m A)
Stability vs. ESR vs. ILoad
10000 10000
Stability vs. ESR vs. ILoad
U nstable R egion
1000 100
U nstable R egion
1000
100
C L =2F CLESR ( )
CLESR ( )
C L =10F
10 1 0 .1 0 .0 1
10
1
S table R egion
S table R egion
0 .1 0 .0 1 0 250 500
U ntested R egion
750 1000 1250 1500
0 .0 0 1 0
U ntested R egion
250 500 750 1000 1250 1500
ILO AD (m A)
ILO AD (m A)
9
AME, Inc.
AME8844
750mA CMOS LDO
n 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 20.67 11.27 7.75 5.90 4.77 4.00 3.44 3.02 2.70 2.43 2.21 2.03 1.88 1.75 1.63 1.53 1.44 1.36 1.29 1.23 1.17 1.12 1.07 1.02 0.98 0.95 0.91 0.88 0.85 0.82 0.79 0.77 0.75 0.73 0.70 0.69 0.67 1 2 5 10 20
R2(kohm)=(1.24*R1(kohm))/(Vout-1.24) 41.33 22.55 15.50 11.81 9.54 8.00 6.89 6.05 5.39 4.86 4.43 4.07 3.76 3.49 3.26 3.06 2.88 2.73 2.58 2.46 2.34 2.23 2.14 2.05 1.97 1.89 1.82 1.76 1.70 1.64 1.59 1.54 1.49 1.45 1.41 1.37 1.33 103.33 56.36 38.75 29.52 23.85 20.00 17.22 15.12 13.48 12.16 11.07 10.16 9.39 8.73 8.16 7.65 7.21 6.81 6.46 6.14 5.85 5.59 5.34 5.12 4.92 4.73 4.56 4.40 4.25 4.11 3.97 3.85 3.73 3.63 3.52 3.43 3.33 206.67 112.73 77.50 59.05 47.69 40.00 34.44 30.24 26.96 24.31 22.14 20.33 18.79 17.46 16.32 15.31 14.42 13.63 12.92 12.28 11.70 11.17 10.69 10.25 9.84 9.47 9.12 8.79 8.49 8.21 7.95 7.70 7.47 7.25 7.05 6.85 6.67 413.33 225.45 155.00 118.10 95.38 80.00 68.89 60.49 53.91 48.63 44.29 40.66 37.58 34.93 32.63 30.62 28.84 27.25 25.83 24.55 23.40 22.34 21.38 20.50 19.68 18.93 18.24 17.59 16.99 16.42 15.90 15.40 14.94 14.50 14.09 13.70 13.33
10
AME, Inc.
AME8844
750mA CMOS LDO
n 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 0.57 0.56 0.55 0.54 0.53 0.51 0.50 0.49 0.48 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 0.37 0.37 0.36 0.36 0.35 0.35 0.34 0.34 0.33 0.33 1 2 5 10 20
R2(kohm)=(1.242*R1(kohm))/(Vout-1.242) 1.30 1.27 1.23 1.20 1.18 1.15 1.12 1.10 1.07 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 0.82 0.81 0.80 0.78 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 3.16 3.08 3.01 2.94 2.87 2.81 2.74 2.68 2.63 2.57 2.52 2.47 2.42 2.38 2.33 2.29 2.25 2.21 2.17 2.13 2.09 2.06 2.03 1.99 1.96 1.93 1.90 1.87 1.85 1.82 1.79 1.77 1.74 1.72 1.69 1.67 1.65 6.49 6.33 6.17 6.02 5.88 5.74 5.61 5.49 5.37 5.25 5.15 5.04 4.94 4.84 4.75 4.66 4.58 4.49 4.41 4.34 4.26 4.19 4.12 4.05 3.99 3.92 3.86 3.80 3.75 3.69 3.64 3.58 3.53 3.48 3.43 3.39 3.34 3.30 12.98 12.65 12.34 12.04 11.75 11.48 11.22 10.97 10.74 10.51 10.29 10.08 9.88 9.69 9.50 9.32 9.15 8.99 8.83 8.67 8.52 8.38 8.24 8.10 7.97 7.85 7.73 7.61 7.49 7.38 7.27 7.17 7.07 6.97 6.87 6.78 6.68 6.60
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.
11
AME, Inc.
AME8844
750mA CMOS LDO
n Package Dimension
MSOP-8
Top View D e1
TOP PKG.
SYMBOLS
DETAIL A
MILLIMETERS MIN MAX
1.07 0.20 0.92 0.38 0.33 0.23 0.17 3.10 4.98 3.10
INCHES MIN
0.002 0.032 0.011 0.011 0.005 0.005 0.114 0.188 0.114
MAX
0.04197 0.008 0.036 0.015 0.013 0.009 0.006 0.122 0.196 0.122
A A1 A2 b b1 c c1 D E E1 e e1 L
0.05 0.81 0.28 0.28 0.13 0.13 2.90 4.77 2.90
BTM PKG.
E1
E
L2 L L1
c
PIN 1 I.D (SHINNY SURFACE)
0.65 TYP 1.95 TYP 0.406 0.686
0.0255 TYP 0.0767 TYP 0.01598 0.02701 0.037 REF 0.010 TYP
o
Front View
R0.127(0.005) TYP ALL CORNER & EDGES
L1 L2 e
0.94 REF 0.254 TYP 0
o
A
A2 A1 e b
8
0o
8o
End View
SECTION B-B b b1
BASE METAL
B B E1
See Detail A
c
c1
WITH PLATING
NOTE: 1. Controlling dimension : Millimeter, converted inchdimension are not necessarily exact. 2. Dimensiioning and tolerancing per ansi Y14.5m-1994. 3. Dimension "d" does not include mold flash,protrusion or gate burr, mold flash,protrusion and gate burr shall not exceed 0.15mm(0.006") per side. Dimension e1 do not include inter-lead flash or protrusion, inter-lead flash and protrusion shall not exceed 0.15mm(0.006") per side. 4. The package top be smaller than the package bottom. Dimension d and e1 are determined at outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 5. Dimension 'b' does not include dambar protrusion. Allowable dambar protrusion shall be 0.08mm(0.0031) total in excess of the "b" dimension at maximum material condition.
12
AME, Inc.
AME8844
750mA CMOS LDO
n Tape and Reel Diagram
PIN 1 W
P
Carrier Tape, Number of Components Per Reel and Reel Size
Package MSOP-8L
Carrier Width (W) 12mm
Pitch (P) 9.1mm
Part Per Full Reel 4000
Reel Size 13in
13
www.ame.com.tw
E-Mail: sales@ame.com.tw
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. , July 2003 Document: 2013-DS8844-E
Corporate Headquarter
AME, Inc.
2F, 189 Kang-Chien Road, Nei-Hu Dist. Taipei 114 Taiwan, R.O.C. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989
U.S.A. (Subsidiary)
Analog Microelectronics, Inc.
3100 De La Cruz Blvd. Suite 201 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: (408) 988-2489

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