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AME
AME5143
General Description
The AME5143 switching regulator is current-mode boost converters operating at fixed frequency of 1.4MHz. The use of MSOP-8/PP package, made possible by the minimal power loss of the internal 1.8A switch, and use of small inductor and capacitors result in the industry's highest power density. The 30V internal switch makes these solutions perfect for boosting to voltages up to 30V. These parts have a logic-level shutdown pin that can be used to reduce quiescent current and extend battery life. Protection is provided through cycle-by-cycle current limiting and thermal shutdown. Internal compensation simplifies and reduces component count.
1.4MHz Boost Converter With 30V Internal FET Switch
Typical Application
V IN 5V L1 10H C3 10F D1 VOUT 6V
C1 4.7F
IN GND FB
SW
L2 10H
R1 59K
CF 820pF
EN AME5143 SW CS CS Rcs Cs C2 22F R2 15K
Figure 1. 5V to 6V Boost Converter
L1 4.7H
Features
30V DMOS FET Switch 1.4MHz Switching Frequency Low RDSON DMOS FET Switch Current Up to 1.8A (CS Connects to GND) Wide Input Voltage Range (2.7V-5.5V) Low Shutdown Current (<1A) MSOP-8/PP Package Uses Tiny Capacitors and Inductor Meet RoHS Standards
VIN 3.3V D1 IN AME5143 EN C1 4.7F GND FB CS R2 10K CF 820pF SW R1 30K
VOUT 5V 750mA
C2 22F
Figure 2. 3.3V to 5V Boost Converter
L1 10H VOUT 12V 500mA
VIN 5V
D1 IN AME5143 EN FB CS R2 13.3K CF 220pF SW R1 117K
Applications
White LED Current Source PDA's and Palm-Top Computers Digital Cameras Portable Phones and Games Local Boost Regulator
C1 4.7F
GND
C2 10F
Figure 3. 5V to 12V Boost Converter
Rev.A.01
1
AME
AME5143
Function Block Diagram
EN SW
1.4MHz Boost Converter with 30V Internal FET Switch
IN SHUTDOWN CIRCUITRY R5 R6 THERMAL SHUTDOWN
+
Q1 FB RC R3 Q2X8
R Gm RAMP GENERATOR
-
+
-
R R S
Q
DRIVER
oscillator
CC
CURRENT LIMIT COMP
+
R4
-
RW
GND
CS
Figure 4. Functional Block Diagram
2
Rev.A.01
AME
AME5143
n Pin Configuration
MSOP-8/PP Top View
8 7 6 5
1.4MHz Boost Converter With 30V Internal FET Switch
AME5143AE2Axxx 1. IN 2. EN 3. GND
AME5143
4. FB 5. SW 6. SW 7. CS 8. CS
1
2
3
4
Die Attach: Conductive Epoxy
Note: The rectangular area enclosed by dashed line represents Exposed Pad and is GND.
Rev.A.01
3
AME
AME5143
n Pin Description
AME5143AE2A MSOP-8/PP
Pin Number 1 Pin Name IN Pin Description Analog and Power input. Input Supply Pin. Place bypass capacitor as close to VIN as possible. Enable, active high. The enable pin is an active high control. Tie this pin above 2V to enable the device. Tie this pin below 0.4V to turn off the device. Ground. Tie directly to ground plane. Output voltage feedback input. Set the output voltage by selecting values for R1 and R2 using: 4 FB
1.4MHz Boost Converter with 30V Internal FET Switch
2 3
EN GND
V R 1 = R 2 out - 1 1 . 23 V
Connect the ground of the feedback network to a GND plane. Power Switch input. This is the drain of the internal NMOS power switch. Minimize the metal trace area connected to this pin to minimize EMI. Current sense pins
5,6
SW
7,8
CS
4
Rev.A.01
AME
AME5143
n Ordering Information AME5143 x x x x xxx x
1.4MHz Boost Converter With 30V Internal FET Switch
Special Feature Output Voltage Number of Pins Package Type Operating Ambient Temperature Range Pin Configuration
Pin Configuration A
(MSOP-8/PP)
Operating Ambient Temperature Range E: -40OC to +85OC
Package Type
Number of Output Voltage Pins A: 8
Special Feature
1. IN 2. EN 3. GND 4. FB 5. SW 6. SW 7. CS 8. CS
2: MSOP/PP
ADJ: Adjustable Z: Lead free
Rev.A.01
5
AME
AME5143
n Available Options
Part Number
AME5143AE2AADJZ
1.4MHz Boost Converter with 30V Internal FET Switch
Marking*
5143 Ayww
Output Voltage
ADJ
Package
MSOP-8/PP
Operating Ambient Temperature Range
-40OC to +85OC
Note: yww represents the date code and pls refer to Date Code Rule before Package Dimension. * A line on top of the first letter represents lead free plating such as 5143. Please consult AME sales office or authorized Rep./Distributor for the availability of package type.
6
Rev.A.01
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AME5143
n Absolute Maximum Ratings
Parameter
Input Supply Voltage EN, FB Voltages SW Voltage ESD Classification
1.4MHz Boost Converter With 30V Internal FET Switch
Symbol
VIN VEN ,V FB VSW
Maximum
6 VIN 30 B*
Unit
V V V
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device. * HBM B:2000V~3999V
n Recommended Operating Conditions
Parameter
Ambient Temperature Range Junction Temperature Range Storage Temperature Range
Symbol
TA TJ TSTG
Rating
-40 to +85 -40 to +125 -65 to +150
Unit
o
C
n Thermal Information
Parameter
Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Solder Iron (10 Sec)**
Package
MSOP-8/PP MSOP-8/PP MSOP-8/PP
Die Attach
Symbol
JC
Maximum
9
Unit
O
C/W
Conductive Epoxy
JA
PD
142 900 350 mW
o
C
* Measure JC on backside center of molding compund if IC has no tab. ** MIL-STD-202G 210F
Rev.A.01
7
AME
AME5143
n Electrical Specifications
VIN = 5V, EN = VIN, TA= 25oC, I L = 0A, unless otherwise noted. Parameter Input Voltage Switch Current Limit Switch Current Limit Trip Volatge Point Symbol VIN ICL VCS Rcs = 0 ISW = 5mA VIN = 5V Switch ON Resistance RDSON VIN = 3.3V Feedback Pin Reference Voltage Feedback Pin Bias Current VFB IFB TA = 25OC TA = -40 to +85 C TA = 25 C TA = -40 to +85oC 1.205 1.23 60
o O o
1.4MHz Boost Converter with 30V Internal FET Switch
Test Condition
Min 2.7
Typ
Max 5.5
Units V A
1.8 90 100 0.4 0.5 110 0.6 0.7 0.7 0.8 1.255 500
mV
VIN = 3V VFB = 1.23V FB = 1.15V (Switching) TA = 25 C VIN = 5V TA = -40 to +85 C FB = 1.3V (Not Switching) TA = 25oC VIN = 5V TA = -40 to +85 C
o o
V nA
2 3 400 500 0.01 2.15 2.35 160 20 1 2.55 A mA
Quiescent Current
IQ
Shutdown Current Undervoltage Lockout Over Temperature Protection OTP Hysteresis Temperature FB Voltage Line Regulation Switching Frequency Maximum Duty Cycle Switch Leakage EN Input Threshold (Low) (Shutdown) EN Input Threshold (High) (Enable the device) UVP OTP
EN = 0V Rising Edge VIN =2.7V to 5.5V
A V
o o
C C
VFB VIN
fSW DMAX ISW EN Threshold
2.7V <= VIN <= 5.5V VIN = 3V, TA = -40 to +85oC VIN = 3V, TA = -40 to +85oC EN = 0V TA = -40 to +85oC TA = -40 to +85oC 2 1 86
0.02 1.4 93 0.1 2 0.4 1.65
%V MHz % A
V
8
Rev.A.01
AME
AME5143
n Detailed Description
The AME5143 is a switching converter IC that operates at a fixed frequency (1.4MHz) for fast transient response over a wide input voltage range and incorporates pulse-bypulse current limiting protection. Operation can be best understood by referring to Figure 4. Because this is current mode control, a 40m sense resistor RW in series with the switch FET is used to provide a voltage (which is proportional to the FET current) to both the input of the pulse width modulation (PWM) comparator and the current limit amplifier. We can develop an expression which allows the maximun current limit to be calculated.
1.4MHz Boost Converter With 30V Internal FET Switch
n Application Hints
Selecting The External Capacitors The best capacitors for use with the AME5143 are multilayer Ceramic capacitors. They have the lowest ESR (equivalent series resistance) and highest resonance frequency, which makes them optimum for use with high frequency switching Converters. When selecting a ceramic capacitor, only X5R and X7R dielectric types should be used. Other types such as Z5U and Y5F have such severe loss of capacitance due to effects of temperature variation and applied voltage, they may provide as little as 20% of rated capacitance in many typical applications. Always consult capacitor manufacturer' s data curves before selecting a capacitor. High-quality ceramic capacitors can be obtained from Taiyo-Yuden, AVX, and Murata. Selecting The Output Capacitor A single ceramic capacitor of value 4.7F to 10F will provide sufficient output capacitance for most applications. If larger amounts of capacitance are desired for improved line support and transient response, tantalum capacitors can be used. Aluminum electrolytic with ultra low ESR such as Sanyo Oscon can be used, but are usually prohibitively expensive. Typical AI electrolytic capacitors are not suitable for switching frequencies above 500kHz due to significant ringing and temperature rise due to self-heating from ripple current. An output capacitor with excessive ESR can also reduce phase margin and cause instability. In general, if electrolytic are used, it is recommended that. They be paralleled with ceramic capacitors to reduce ringing, switching losses, and output voltage ripple. Selecting The Input Capacitor An input capacitor is required to serve as an energy reservoir for the current which must flow into the coil each time the switch turns ON. This capacitor must have extremely low ESR, so ceramic is the best choice. We recommend a nominal value of 4.7F, but larger values can be used. Since this capacitor reduces the amount of voltage ripple seen at the input pin, it also reduces the amount of EMI passed back along that line to other circuitry.
RCS = VCS / ICL - 40m
At the beginning of each cycle, the S-R latch turns on the FET. As the current through the FET increases, a voltage (proportional to this current) is summed with the ramp coming from the ramp generator and then fed into the input of the PWM comparator. When this voltage exceeds the voltage on the other input (coming from the Gm amplifier), the latch resets and turns the FET off. Since the signal coming from the Gm amplifier is derived from the feedback (which samples the voltage at the output), the action of the PWM comparator constantly sets the correct peak current through the FET to keep the output voltage in regulation. Q1 and Q2 align with R3 - R6 form a bandgap voltage reference used by the IC to hold the output in regulation. The currents flowing through Q1 and Q2 will be equal, and the feedback loop will adjust the regulated output to maintain this. Because of this, the regulated output is always maintained at a voltage level equal to the voltage at the FB node "multiplied up" by the ratio of the output resistive divider. The current limit comparator feeds directly into the flipflop that drives the switch FET. If the FET current reaches the limit threshold, the FET is turned off and the cycle terminated until the next clock pulse. The current limit input terminates the pulse regardless of the status of the output of the PWM comparator.
Rev.A.01
9
AME
AME5143
n Application Hints
Feed-Forward Compensation Although internally compensated, the feed-forward capacitor Cf is required for stability. Adding this capacitor puts a zero in the loop response of the Converter. The recommended frequency for the zero fz should be approximately 6kHz. Cf can be calculated using the formula: Shutdown Pin Operation The device is turned off by pulling the shutdown pin low. If this function is not going to be used, the pin should be tied directly to V IN. If the SHDN function will be needed, a pull-up resistor must be used to VIN (approximately 50k100k recommended). The EN pin must not be left unterminated.
1.4MHz Boost Converter with 30V Internal FET Switch
Cf = 1 / (2 x
Selecting Diodes
x R1 x fz)
The external diode used in the typical application should be a Schottky diode. A 30V diode such as the MBR0530 is recommended. The MBR05XX series of diodes are designed to handle a maximum average current of 0.5A. For applications exceeding 0.5A average but less than 1A, a Microsemi UPS5817 can be used. Thermal Consuderations At higher duty cycles, the increased ON time of the FET means the maximum output current will be determined by power dissipation within the AME5143 FET switch. The switch power dissipation from ON-state conduction is calculated by: P(SW) = D x I2IND(AVE) x RDS(ON) There will be some switching losses as well, so some derating needs to be applied when calculating IC power dissipation. Inductor Suppliers Recommended suppliers of inductors for this product include, but are not limited to Sumida, Coilcraft, Panasonic, TDK and Murata. When selecting an inductor, make certain that the continuous current rating is high enough to avoid saturation at peak currents. A suitable core type must be used to minimize core (switching) losses, and wire power losses must be considered when selecting the current rating.
10
Rev.A.01
AME
AME5143
IQ VIN(Active) vs Temperature
3.50 3.00
1.4MHz Boost Converter With 30V Internal FET Switch
Oscillator Frequency vs Temperature
1.60
Oscillator Frequency (MHz)
1.55 1.50 1.45 1.40 1.35 1.30 1.25 1.20 1.15 1.10 1.05 1.00 -50 -25 0 25 50
o
IQ VIN Active (mA)
2.50 2.00 1.50 1.00 0.50 0.00 -50
V IN=3.3V
V IN=5V
-25
0
25
50
75
100
125
Temperature (O C)
75
100
125
Temperature ( C)
Max. Duty Cycle vs Temperature
95.0 94.5
IQ VIN (Idle) vs Temperature
500
Max Duty Cycle (%)
94.0 93.5 93.0 92.5 92.0 91.5 91.0 90.5 90.0 -50 -25 0
VIN =3.3V
400
IQ VIN (Idle) (A)
300
VIN =5V
200
100
25
50
o
75
100
125
0 -50
-25
0
25
50 O
75
100
125
Temperature ( C)
Temperature ( C)
Feedback Voltage vs Temperature
1.24
0.04
Feedback Bias Current vs Temperature
Feedback Bias Current (A)
Feedback Voltage (V)
1.23
0.03
1.22
0.02
1.21
0.01
1.20 -50
-25
0
25
50
o
75
100
125
0
-50
-25
0
25
50
75
100
125
Temperature ( C)
Rev.A.01
Temperature ( oC)
11
AME
AME5143
RDS(ON) vs Temperature
800 700 600
1.4MHz Boost Converter with 30V Internal FET Switch
RDS(ON) vs VIN
750 700 650 600 550
RDS(ON) (m)
75
o
RDS(ON) (m)
500 400 300 200 100 0 -50
V IN = 3.3V
500 450 400 350 300 250 200 150 100 50 0 2.5
VIN = 5V
-25
0
25
50
100
125
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
Temperature ( C)
VIN (V)
Efficiency vs Iout
95
100
Efficiency vs Iout
90
Efficiency (%)
90
Efficiency (%)
80
85
70
60
80
VIN=3.3V VOUT=5V
75 0 100 200 300 400 500 600 700 800 900
50
VIN =5V VOUT=12V
40 0 100 200 300 400 500 600
IOUT(mA)
IOUT(mA)
Start Up Waveform
EN 1V/Div VOUT 2V/Div
IL 500mA/Div
V IN= 3.3V V OUT=5V ILOAD =700mA
400S/Div
12
Rev.A.01
AME
AME5143
n Tape and Reel Dimension
MSOP-8/PP
1.4MHz Boost Converter With 30V Internal FET Switch
P
PIN 1 W
AME AME
Carrier Tape, Number of Components Per Reel and Reel Size
Package MSOP-8/PP
Carrier Width (W) 12.00.1 mm
Pitch (P) 4.00.1 mm
Part Per Full Reel 4000pcs
Reel Size 3301 mm
Rev.A.01
13
AME
AME5143
n Package Dimension
MSOP-8/PP
TOP VIEW SIDE VIEW
SYMBOLS MILLIMETERS MIN MAX
0.150 0.950 0.380
1.4MHz Boost Converter with 30V Internal FET Switch
INCHES MIN
0.0000 0.0295 0.0087
MAX
0.0059 0.0374 0.0150
L D1 E1 E E2 L2
A1 A2 b E D e E1
0.000 0.750 0.220
3.000 BSC 3.000 BSC 0.650 BSC 4.900 BSC 0.400 0
o
0.1181 BSC 0.1181 BSC 0.0256 BSC 0.1929 BSC 0.0157 0
o
1
FRONT VIEW
D A2
0'
L ' L2 E2 D1
0.800 8
o
0.0315 8
o
0.950 REF 1.380 1.420 1.800 1.800
0.0374 REF 0.0543 0.0559 0.0709 0.0709
b
e
A1
14
Rev.A.01
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. , March 2009 Document: 1259-DS5143-A.01
Corporate Headquarter
AME, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan, R.O.C. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989

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