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Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n General Description
The AME8841 linear regulator features low quiescent current (30A typ.) with low dropout voltage, making it ideal for battery applications. The space-saving SO-8 package is attractive for "Pocket" and "Hand Held" applications. These rugged devices have both Thermal Shutdown, and Current Fold-back to prevent device failure under the "Worst" of operating conditions. The AME8841 is stable with an output capacitance of 2.2F or greater.
n Features
l l l l l l l l l l l
Very Low Dropout Voltage Guaranteed 600mA Output Accurate to within 1.5% 30A Quiescent Current Over-Temperature Shutdown Current Limiting Short Circuit Current Fold-back Power-Saving Shutdown Mode Space-Saving SO-8 Package Many fixed output voltages available Low Temperature Coefficient
n Applications
l l l l l l l
n Pin Configuration
SO-8 Top View
OUT IN GND OUT AME 8841 NC EN NC NC
Instrumentation Portable Electronics Wireless Devices Cordless Phones PC Peripherals Battery Powered Widgets Electronic Scales
n Functional Block Diagram
IN
Overcurrent Shutdown
OUT
n Typical Application
IN
IN
AME8841
GND
OUT EN
OUT
Thermal Shutdown
EN
C1 5V
R1 AMP
C3 2.2F
1F
V ref =1.215V
R2 GND
1
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n Absolute Maximum Ratings:
Parameter Input Voltage Output Current Input, Output Voltage ESD Classification Maximum 8 Unit V A V
PD / (VIN - VO)
GND - 0.3 to V IN + 0.3 B
n Recomended Operating Conditions:
Parameter Ambient Temperature Range Junction Temperature Rating -40 to +85 -40 to +125 Unit
o
C C
o
n Thermal Paramters
Parameter Thermal Resistance (ja) Internal Power Dissipation (PD ) ( T = 100oC) Maximum Junction Temperature Maximum Lead Temperature ( 10 Sec) Maximum 123.7 810 150 300
o
Unit C/W mW
o
C C
o
Caution: Stress above the listed absolute rating may cause permanent damage to the device
2
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n Ordering Information
P art N um ber
A M E 8841A E HA
Marking
8841 A E HA y y ww 8841 B E HA y y ww 8841 CE HA y y ww 8841 DE HA y y ww 8841 E E HA y y ww 8841 FE HA y y ww 8841 GE HA y y ww 8841 HE HA y y ww 8841 IE HA y y ww 8841 JE HA y y ww 8841 K E HA y y ww 8841 LE HA y y ww 8841 M E HA y y ww 8841 NE HA y y ww 8841 OE HA y y ww 8841 RE HA y y ww
Output
3.3V
P ackage
S O-8
Operating Temp.
-40 O C to + 85 O C
A M E 8841B E HA
3.0V
S O-8
-40 O C to + 85 O C
A M E 8841CE HA
2.8V
S O-8
-40 O C to + 85 O C
A M E 8841DE HA
2.5V
S O-8
-40 O C to + 85 O C
A M E 8841E E HA
3.8V
S O-8
-40 O C to + 85 O C
A M E 8841FE HA
3.6V
S O-8
-40 O C to + 85 O C
A M E 8841GE HA
3.5V
S O-8
-40 O C to + 85 O C
A M E 8841HE HA
2.7V
S O-8
-40 O C to + 85 O C
A M E 8841IE HA
3.4V
S O-8
-40 O C to + 85 O C
A M E 8841JE HA
2.85V
S O-8
-40 O C to + 85 O C
A M E 8841K E HA
3.7V
S O-8
-40 O C to + 85 O C
A M E 8841LE HA
1.5V
S O-8
-40 O C to + 85 O C
A M E 8841M E HA
1.8V
S O-8
-40 O C to + 85 O C
A M E 8841NE HA
2.9V
S O-8
-40 O C to + 85 O C
A M E 8841OE HA
3.1V
S O-8
-40 O C to + 85 O C
A M E 8841RE HA
2.65V
S O-8
-40 O C to + 85 O C
P lease c ons ult A M E s ales office or authorized Rep./Distributor for other output voltage and pac kage type availability .
3
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n Electrical Specifications
TA = 25 o C unless otherwise noted
Parameter Input Voltage Output Voltage Accuracy Symbol VIN VO IO=600mA VO=VONOM -2.0% IO=1mA 1.4V1.2V VO>1.2V VO<0.8V IO=0mA IO=1mA to 600mA IO=5mA VIN=VO+1 to VO+2 VO < 2.0V 4.0V > VO >= 2.0V VO >= 4.0V Over Temerature Shutdown Over Temerature Hysterisis VO Temperature Coefficient OTS OTH TC f=1kHz Power Supply Rejection PSRR IO=100mA CO=2.2F f=10Hz to 100kHz IO=10mA,CBYP=0F f=10kHz f=100kHz Co=2.2F 2.0 0 -0.15 -0.1 -0.4 150 30 30 50 20 15 30 Vin 0.4 0.1 0.5 0.5 1 mVrms V V A A A dB 0.02 600 600 800 300 30 30 600 50 50 0.15 0.1 0.4 See chart Test Condition Min Note 1 -1.5 Typ Max 7 1.5 1400 800 600 mA mA mA A A % % %
o o
Units V %
Dropout Voltage
VDROPOUT
mV
Line Regulation
REGLINE
C C
ppm/oC
Output Voltage Noise
eN VEH VEL IEH IEL ISD
EN Input Threshold
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=5V, VO=0V, VENEN Input Bias Current Shutdown Supply Current Note1:VIN(min)=VOUT+VDROPOUT
4
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n Detailed Description
The AME8841 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 150oC, or the current exceeds 600mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 110oC. The AME8841 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The AME8841 also incorporates current foldback to reduce power dissipation when the output is short circuited. This feature becomes active when the output drops below 0.8 volts, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.8 volts.
n Enable
The Enable pin normally floats high. When actively, 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.
n External Capacitors
The AME8841 is stable with an output capacitor to ground of 2.2F 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.
5
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
Ground Current vs. Input Voltage
45 40
Vo(10mV/DIV)
Load Step ( 1mA-600mA)
Ground Current (A)
35 30 25 20 15 10 5 0 0 1 2 3 4
85 O C
Output C L =2.2F CIN=2.2F
25 O C IL(200mA/DIV)
IL o a d
0 TIME ( 20mS/DIV)
5
6
7
8
Input Voltage (V)
Drop Out Voltage vs. Output Voltage
0.3
Power Supply Rejection Ratio
0 -10
Drop Out Voltage (V)
0.25 0.2 0.15 0.1 0.05 0 2 2.5 3 3.5
IL O A D= 6 0 0 m A
-20 PSRR (dB) -30 -40 -50 -60 -70
C L =2.2 F Tantalum C B Y P =0
100mA
100mA
10mA
100 A
100 A
1mA
4
4.5
5
5.5
-80 1.0E+01
1.0E+03
1.0E+05
1.0E+07
Output Voltage (V)
Frequency (Hz)
Safe Operating Area
600 8807AEHA 8841AEHA
Output Current (mA)
100
10 0.1 1.0 8.0
Input-Output Voltage Differential (V) 6
Analog Microelectronics, Inc.
AME8841
Noise Measurement
(200mA/DIV)
600mA CMOS LDO
Overtemperature Shutdown
Vo (1mV/ DIV)
OUT
CL = 2.2F NO FILTER
0
R LOAD =6.6
VOUT (1V/DIV)
I
0
TIME (20mS/DIV)
TIME (0.5Sec/DIV)
Short Circuit Response
I OUT (200mV/DIV)
C L O A D =2.2F C IN = 1F R L O A D < 1 0 0 m
Current Limit Response
IOUT (200mA/DIV) VOUT (1V/DIV)
TIME (2mS/DIV)
V OUT (1V/DIV)
C L O A D =2.2F C I N =1.0F R L O A D =3.3 V O U T N O M =3.3V
TIME (2mS/DIV)
Chip Enable Transient Response
Enable (2V/DIV)
Line Transient Response
VIN(1V/DIV)
C L =2F R L =10
0
Output (1V/DIV)
0 TIME ( 1mS/DIV)
VOUT (10mV/DIV)
C L O A D =2.2F IL O A D = 1 m A V O U T D C =3.3V V I N D C =4.5V
TIME (200mS/DIV)
7
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
Quiescent Current vs.Temp.
40 Quiescent Current (uA) 38 36 34 32 30 28 26 -20 0 20 40 60 Temperature (0C) 80 EN pin LO bias current (uA)
-0.20
EN pin vs. Temp.
-0.25
-0.30
-0.35
-0.40
-0.45
-0.50 -20 0 20 40 60 80
Tem perature (0C)
Shut Down Current vs. Temp.
0.65 0.60 0.55 0.50 0.45 0.40 0.35 0.30 -20 0 20 40 60 80 500
Dropout Voltage vs. Temp.
Dropout Voltage @ 600mA (mV)
480 460 440 420 400 380 360 -20 0 20 40 60 80
Shut Down Current (uA)
Temperature (0C)
Tem perature (0C)
Vout vs. Temp.
2.660 0.55
Load Regulation vs. Temp.
Vout @ Vin=Vout+2V (V)
2.655 2.650 2.645 2.640 2.635 2.630 2.625 2.620 -20 0 20 40
0
Load Regulation (%)
60 80
0.50
0.45
0.40
0.35
0.30 -20 0 20 40 60 80
Temperature ( C)
Tem perature (0C)
8
Analog Microelectronics, Inc.
AME8841
600mA CMOS LDO
n Package Dimension
SO-8
SY MBO LS A A1 A2 B
MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 -- 0.33 0.19 4.80 3.80 -- 5.80 0.40 -- 0
INCHES MIN MAX 0.053 0.069 0.004 0.010 -- 0.013 0.007 0.189 0.150 -- 0.228 0.016 0
-- 0.51 0.25 5.00 4.00 -- 6.20 1.27 0.10 8
-- 0.020 0.010 0.1970 0.157 -- 0.244 0.050 0.004 8
C D E e H L y
9
www.analogmicro.com
E-Mail: info@analogmicro.com
Life Support Policy: These products of Analog Microelectronics, Inc. are not authorized for use as critical components in lifesupport devices or systems, without the express written approval of the president of Analog Microelectronics, Inc. Analog Microelectronics, 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) Analog Microelectronics, Inc. , August 2001 Document: 2006-DS8841-C
Corporate Headquarters
Analog Microelectronics, Inc.
3100 De La Cruz Blvd. Suite 201 Santa Clara, CA. 95054-2046 Tel : (408) 988-2388 Fax: (408) 988-2489
Asia Pacific Headquarters
AME, Inc.
2F, NO. 187 Kang-Chien Road, Nei-Hu Dist., Taipei 114, Taiwan, R.O.C. Tel : 886 2 2627-8687 Fax : 886 2 2659-2989

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