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AME, Inc.
AME5106
n General Description
AME5106 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 0 up to 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 350KHz to 30KHz. Also, an internal compensation block is built in to minimum external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 18V, it is also suitable for the operation via an AC adapter.
PWM Control 2A Buck Converter
n Applications
l PC Motherboard l LCD Monitor l Graphic Card l DVD-Video Player l Telecom Equipment l ADSL Modem l Printer and other Peripheral Equipment l Microprocessor core supply l Networking power supply
n Features
l Input voltage: 3.6V to 18V. l Output voltage: 0.8V to VCC. l Duty ratio: 0% to 100% PWM control l Oscillation frequency: 350KHz typ. l Soft-start, Current limit, Enable function l Thermal Shutdown function l Built-in internal SW P-channel MOS l SOP-8 Package l All AME' s Lead Free Products Meet RoHS Standards S C
Rev.A.01
1
AME, Inc.
AME5106
n Typical Application
PWM Control 2A Buck Converter
Note: VOUT = V FB x (1+RA/RB) RB=0.7K~ 5K
VIN =12V,IMAX=2A VOUT L1 Value 2.5V 22uH 3.3V 27uH 5V 33uH
n Function Block Diagram
SW Oscillation Circuit IN PWM-Switched Control Circuit Thermal Shutdown VEN 100A GND + FB Reference Voltage Source with Soft Start
EN
OCSET
2
Rev.A.01
AME, Inc.
AME5106
n Pin Configuration
SOP-8 Top View
8 7 6 5
PWM Control 2A Buck Converter
AME5106 1. FB 2. EN 3. OCSET 4. IN 5. SW 6. SW
AME5106
1
2
3
4
7. GND 8. GND * Die Attach: Conductive Epoxy
n Pin Description
Pin Number Pin Name Pin Description Output voltage Feedback input. Set the outputC voltage by selecting values for Ra and Rb using: 1 FB
Ra + Rb V OUT = 0 .8V Rb
Connect the ground of the feedback network to an AGND (Analog Ground) plane which should be tied directly to the GND pin. Enable Control Input, active high. The enable pin is an active high control. Tie this pin above 2V to enable the device. Tie this pin below 0.8V to shut down the device. In shutdown, all function are disabled. Do not leave EN pin floating. Add an external resistor to set max output current. Input Supply Voltage Pin. Bypass this pin with a capacitor. The capacitor shall be placed as close to the device as possible. Switch Node Connection to Inductor. Ground. Tie directly to ground plane.
2
EN
3 4 5,6 7,8
OCSET IN SW GND
Rev.A.01
3
AME, Inc.
AME5106
n Ordering Information AME5106 x x x x xxx x
PWM Control 2A Buck Converter
Special Feature Output Voltage Number of Pins Package Type Operating Ambient Temperature Range Pin Configuration
Pin Configuration A
(SOP-8)
Operating Ambient Package Type Temperature Range I: -20OC to 85OC H: SOP
Number of Pins A: 8
Output Voltage
Special Feature
1. FB 2. EN 3. OCSET 4. IN 5. SW 6. SW 7. GND 8. GND
ADJ: Adjustable
Z:
Lead free
n Ordering Information
Part Number
AME5106AIHAADJZ
Marking*
5106 AADJ yyww
Output Voltage
ADJ
Package
SOP-8
Operating Ambient Temperature Range
-20OC to 85OC
Note: ww represents the date code. * A line on top of the first letter represents lead free plating such as 5106 AADJ yyww. Please consult AME sales office or authorized Rep./Distributor for the availability of package type.
4
Rev.A.01
AME, Inc.
AME5106
n Absolute Maximum Ratings
Parameter
Input Supply Voltage EN,SW Pin Voltages FB Pin Voltage ESD Classification
PWM Control 2A Buck Converter
Symbol
IN VEN , VSW VFB
Maximum
-0.3V to 22V -0.3V to 0.3V -0.3V to VIN TBD*
Unit
V
Caution: Stree above the listed absolute maximum rating may cause permanent damage to the device. *HBM B: 2000~3999V
n Recommended Operating Conditions
Parameter
Ambient Temperature Range Junction Temperature Range Storage Temperature Range
Symbol
TA TJ TSTG
Rating
-20 to 85 -20 to 125 -40 to 150
Unit
o
C C C
o
o
C
n Thermal Information
Parameter
Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Solder Iron (10 Sec)**
Package
SOP-8
Die Attach
Symbol
JC JA PD
Maximum
60
Unit
o
C/W
SOP-8
Conductive Epoxy
150
SOP-8
810 350
mW
o
C
* Measure JC on center of molding compound if IC has no tab. ** MIL-STD-202G-210F
Rev.A.01
5
AME, Inc.
AME5106
n Electrical Specifications
VIN = 12V, TA = 25oC,Unless otherwise specified.
Parameter Input Voltage Feedback Voltage FB Pin Bias Current Switch Current Current Consumption During Power Off Output Voltage Line Regulation Output Voltage Load Regulation Oscillator Frequency Frequency of Current Limit or Short Circuit Protect Enable High (enabled) Enable Low (shutdown) EN High Input Current EN Low Input Current OCSET Pin Bias Current Soft Start Time Internal MOSFET RDSON Efficiency Symbol VIN VFB IFB ISW ISSS REGLINE REGLOAD fOSC fOSC1 VIH_EN VIL_EN IIH_EN IIL_EN IOCSET t SS RDSON VFB=0V VEN =0V VIN =5V to 18V IOUT=0.1A to 2A IOUT=0.1A IOUT=0.1A
PWM Control 2A Buck Converter
Test Condition
Min 3.6 0.782
Typ
Max Units 18 V V A A
0.8 0.1
0.818 0.5
2.5 10 2 0.2 300 10 2.0 350 4 0.5 400
A % % KHz KHz
Measure wave form at SW pin Measure wave form at SW pin Evaluate oscillation at SW pin Evaluate oscillation stop at SW pin
V 0.8 20 -10 75 0.3 90 2 110 70 92 105 5 150 100 A A A mS m %
VIN =5V VIN =12V
VIN =12V, VOUT=5V, IOUT=2A
6
Rev.A.01
AME, Inc.
AME5106
n Detailed Description
PWM Control
PWM Control 2A Buck Converter
The AME5106 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AME5106, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. Under Voltage Lockout The under voltage lockout circuit of the AME5106 assures that the high-side MOSFET driver outputs remain in the off state whenever the supply voltage drops below 3.3V. Normal operation resumes once VCC rises above 3.5V. RDS(ON) Current Limiting The current limit threshold is setting by the external resistor connecting from VCC supply to OCSET. The internal 100uA sink current crossing the resistor sets the voltage at the pin of OCSET. When the PWM voltage is less than the voltage at OCSET, an over-current condition is triggered. ILOAD x RDS(ON) =IOCSET x ROCSET
See above formula for setting the current limit value.
C
Rev.A.01
7
AME, Inc.
AME5106
n Characterization Curve(For reference only)
Vin vs. FB
0.84 0.83 0.82 0.81
PWM Control 2A Buck Converter
Line Regulation
3.40
3.35
3.30
VFB(V)
0.80 0.79 0.78 0.77 0.76 0.75 0.74 0 2 4 6 8 10 12 VIN =12V VOUT=3.3V IOUT=0.2A 14 16 18
VOUT(V)
3.25
3.20
3.15
V OUT =3.3V IOUT=0.2A
3.10
0
2
4
6
8
10
12
14
16
18
VI N(V)
V IN (V)
Load Regulation
5.1 5.0 4.9
VIN v.s Frequency
380 375 370
4.8
Fosc (KHZ)
VOUT ( V )
4.7 4.6 4.5 4.4
365 360 355 350
4.3 4.2 4.1 0 0.5 1 1.5 2 VIN=12V
345 340
V OUT =3.3V IOUT=0.2A 0 2 4 6 8 10 12 14 16 18
IOUT ( A )
VI N (V)
Efficiency
100 90 80
Vout Ripple
V OUT=5V VOUT =3.3V
V SW 5V/div
Efficiency (% )
70 60 50 40 30 20 10 0 0
VOUT VIN =12V V OUT= 3.3V I OUT=0.1A
0.5 1 1.5 2 2.5
20 mV/div
I OUT ( A )
8 Rev.A.01
AME, Inc.
AME5106
n Characterization Curve(For reference only)
Vout Ripple
PWM Control 2A Buck Converter
Frequency of short current protect
VSW
5V/div
VSW 5V/div
VOUT V IN =12 V VOUT =3 .3V I OUT=2A
20mV/div
Soft start time
VIN =12V V OUT =5V VOUT ILOAD =2A 2V/div
VSW
5V/div
C
EN 5V/div
Rev.A.01
9
AME, Inc.
AME5106
n Tape and Reel Dimension
SOP-8
P
PWM Control 2A Buck Converter
PIN 1 W AME AME
Carrier Tape, Number of Components Per Reel and Reel Size Package SOP-8 Carrier Width (W) 12.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 2500pcs Reel Size 3301 mm
10
Rev.A.01
AME, Inc.
AME5106
n Package Dimension
SOP-8
Top View C Side View
PWM Control 2A Buck Converter
SYMBOLS
H E
MILLIMETERS MIN MAX
1.75 0.30
INCHES MIN
0.05315
MAX
0.0689
A A1
D L c Front View
7o(4X)
1.35 0.10
0.00394 0.01181 0.05799 REF 0.01299 0.02008 0.00748 0.00984 0.18898 0.20984 0.14961 0.15748 0.05000 BSC 0.01575 0.05000 0.22835 0.24803 0
o
A2 B C D E e L H y
1.473 REF 0.33 0.19 4.80 3.80 0.51 0.25 5.33 4.00
A2
A
1.27 BSC 0.40 5.80 0
o
1.27 6.30 0.10 8
o
B
A1
e
0.00394 8
o
C
Rev.A.01
11
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. , December 2007 Document: ORT6513-DS5106-A.01
Corporate Headquarter
AME, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan. 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. 95054-2438 Tel : (408) 988-2388 Fax: (408) 988-2489

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