View AMC3100_1146243.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

AMC3100
www.addmtek.com DESCRIPTION The AMC3100 is a high efficiency synchronous buck DC/DC converter using a constant frequency, current mode architecture. Adjustable version and fixed output voltages of 1.2V, 1.5V and 1.8V are available. 300uA low supply current at no load and <1A supply current at shutdown. The 2.5V to 5.5V input voltage range makes the AMC3100 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications. Switching frequency is internally set at 1.5MHz, allowing using small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The AMC3100 is available in a low profile (1mm) Thin SOT-23-5L package. TYPICAL APPLICATION
VOUT1.8V / 600mA L VIN2.5V to 5.5V VIN SW VOUT
1.5MHz, 600mA SYNCHRONOUS STEP-DOWN CONVERTER
FEATURES High Efficiency: Up to 96% 600mA Output Current at VIN=3V 2.5V to 5.5V Input Voltage Range 1.5MHz Constant Switching Frequency No Schottky Diode Required 100% Duty Cycle as Low Dropout Operation 0.6V Reference Voltage Allows 0.6V Minimum Output Voltage <1A Shutdown Mode Supply Current Current Mode Operation for Excellent Line and Load Transient Response Over-temperature Protected 4KV HBM ESD Protection 5-Pin Thin SOT-23 package APPLICATIONS PDA, Personal Media Player Smart Phone Digital Still Camera, Video Camcorder Portable Instruments Bluetooth Headset PACKAGE PIN OUT
COUT
10uF
AMC3100-1.8
CIN
4.7uF
RUN
GND
RUN 1 GND 2 SW
3
5
VFB / VOUT*
A64X
4 VIN
SYMBOLIZATION Device Name Output Voltage
AMC3100DBFT AMC3100-1.2DBFT AMC3100-1.5DBFT AMC3100-1.8DBFT Adjustable 1.2V Fixed 1.5V Fixed 1.8V Fixed
Marking
A64A A642 A645 A648
TSOT-23-5L ( Top View )
* Note: VFB pin for adjustable version. VOUT pin for fixed voltage version.
DB
ORDER INFORMATION SOT-23 5-pin AMC3100DBF (Adjustable) AMC3100-X.XDBF (Fixed Voltage)
Note:
1. All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number (i.e. AMC3100-1.8DBFT). 2. The letter "F" is marked for Lead Free process. 1 DD010_A -- JUNE 2006
Copyright (c) 2006 ADDtek Corp.
AMC3100
PIN DESCRIPTION Pin Number 1 2 3 4 Pin Name RUN GND SW VIN Pin Function Enable pin. Higher than 1.5V to turn on the device. Lower than 0.3V to turn it off. The shutdown mode supply current less than <1A supply current. This pin should not be floating. Ground Power Switch Output. Connects to the drains of the internal P-CH and N-CH MOSFET switches. Supply Input Pin. VFB (AMC3100): Feedback Input Pin. Connect VFB to the center point of the external resistor divider. The feedback threshold voltage is 0.6V. VOUT (AMC3100-X.X): Output Voltage Feedback Pin. An internal resistive divider divides the output voltage down for comparison to the internal reference voltage.
5
VFB/VOUT
PACKAGE THERMAL DATA Thermal Resistance from Junction to Ambient, JA
Note : Junction Temperature Calculation: TJ = TA + (PD x JA). PD: Power Dissipation, TA: Ambient temperature, JA: Thermal Resistance-Junction to Ambient The JA numbers are guidelines for the thermal performance of the device/PC-board system. All of the above assume no ambient airflow.
250 OC /W
Copyright (c) 2006 ADDtek Corp.
2
DD010_A --
JUNE 2006
AMC3100
BLOCK DIAGRAM
OSC
SLOPE C OM P OSC
0.65V
FR EQ SH IFT V F B /V O UT
_
+ 0.6V + EA
4
VIN
_
0.4V +
SLEEP
_
5
R1 R2 FB
+ ICO M P
5
BR UST S Q
R Q RS LATC H Bandgap R eference
SW IT CH IN G LOG IC AN D BLANK IN G C IR C UIT
ANT ISH OOTT H RU
3
SW
R UN
1
+ IRCM P
_
2
GN D
ABSOLUTE MAXIMUM RATINGS Input Voltage, VIN RUN, VFB Voltage SW Voltage P-Channel Switch Source Current (DC) N-Channel Switch Sink Current (DC) Peak SW Sink and Source Current Operating Temperature Range (Note 2) Junction Temperature, TJ (Note 3) Storage Temperature Range Lead Temperature (soldering, 10 seconds)
(Note 1)
-0.3V to 6V -0.3V to VIN -0.3 to VIN+0.3V 800mA 800mA 1.3A -40OC to 85OC 125OC -60OC to 150OC 300OC
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The AMC3100 is guaranteed to meet performance specifications from 0C to 70C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD x JA).
Copyright (c) 2006 ADDtek Corp.
3
DD010_A --
JUNE 2006
AMC3100
RECOMMENDED OPERATING CONDITIONS Parameter Supply Voltage Operating free-air temperature range Symbol VIN TA Min 2.5 -40 Typ Max 5.5 85 Unit V
ELECTRICAL CHARACTERISTICS VIN=3.6V, TA=25C. (Unless otherwise noted) Parameter Input DC Supply Current Active Mode IS Shutdown Regulated Output Voltage Output Voltage Line Regulation Output Voltage Load Regulation Peak Inductor Current Feedback Current Regulated Feedback Voltage Reference Voltage Line Regulation Oscillator Frequency RDS(ON) of P-Channel FET RDS(ON) of N-Channel FET SW Leakage RUN Threshold RUN Leakage Current VOUT VOUT VLDREG IPK IVFB VFB VFB fOSC RPFET RNFET ILSW VRUN IRUN TA= 25C TA= 0C TA 85C TA= -40C TA 85C VIN=2.5V to 5.5V VFB=0.6V or VOUT=100% ISW=100mA ISW=-100mA VRUN=0V, VSW=0V or 5V, VIN=5V 0.3 1.2 0.5880 0.5865 0.5850 0.6 0.6 0.6 0.04 1.5 0.4 0.35 0.01 1 0.01 Duty Cycle < 35%, VIN=3V, VFB=0.5V or VOUT=90%, 0.75 Symbol Condition VFB=0.5V or VOUT=90%, ILOAD=0A VRUN=0V, VIN=4.2V AMC3100-1.8, IOUT=100mA AMC3100-1.5, IOUT=100mA AMC3100-1.2, IOUT=100mA VIN=2.5V to 5.5V 1.746 1.455 1.164 Min Typ 300 Max 400 A 0.1 1.800 1.500 1.200 0.04 0.5 1 1.25 30 0.6120 0.6135 0.6150 0.4 1.8 0.5 0.45 1 1.5 1 1 1.854 1.545 1.236 0.4 V %V % A nA V %V MHz A V A Unit
Copyright (c) 2006 ADDtek Corp.
4
DD010_A --
JUNE 2006
AMC3100
CHARACTERIZATION CURVES
Efficiency vs Output Current
100 90 80 Efficiency ( % ) 70 60 50 40 30 20 10 0 0.1 10 Output Current ( mA ) 1000 VOUT =1.5V TA=25C VIN=3.6V VIN=4.2V VIN=5.5V 100 VIN=2.7V 90 80 Efficiency ( % ) 70 60 50 40 30 20 10 0
Efficiency vs Output Current
VIN=2.7V VIN=3.6V
Efficiency vs Output Current
100 90 80 Efficiency ( % ) 70 60 50 40 30 20 10 0 0.1 10 Output Current ( mA ) VOUT =2.5V TA=25C VIN=2.7V VIN=4.2V VIN=5.5V VIN=3.6V
VIN=5.5V VIN=4.2V
VOUT =1.8V TA=25C
0.1
10 Output Current ( mA )
1000
1000
Efficiency vs Input Voltage
100 95 90 Efficiency ( % ) 85 80 75 70 I LOAD=300mA 65 60 55 50 2 3 4 Input Voltage ( V ) I LOAD=600mA VOUT =2.5V TA=25C 5 6 I LOAD=10mA I LOAD=100mA I LOAD=250mA Oscillator Frequency (MHz) 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1
Oscillator Frequency vs Tem perature
Oscillator Frequency (MHz)
VIN=3.6V VOUT =1.5V
Oscillator Frequency vs Supply Voltage
1.8 1.7 1.6 1.5 1.4 1.3 1.2 I LOAD=200 mA VOUT =1.5V TA=25C I LOAD=100 mA
I LOAD=200mA I LOAD=100mA
-50 -25
0
25
50 75 100 125 150
2
3
4
5
6
Temperature ( C )
Supply Voltage ( V )
Load Regulation
1.55 1.54 Output Voltage ( V ) 1.53 1.52 1.51 1.5 0 100 200 300 400 500 600 700 800 Output Current ( mA ) VIN=3.6V VOUT =1.5V TA=25C
R DS(ON) ( ) 0.6 0.5 0.4 0.3 0.2 0.1
RDS (ON) vs Input Voltage
0.6 ILOAD=100 mA TA=25C Main switch R DS(ON) ( ) 0.4 0.3 0.2 0.1 Synchronous switch 0 2 3 4 5 Input Voltage ( V ) 6 7 0 0.5
RDS (ON) vs Tem perature
VIN=3.6V VIN=2.7V
Main switch
VIN=4.2V
Synchronous switch
-50 -25
0 25 50 75 100 125 150 Temperature ( C )
Copyright (c) 2006 ADDtek Corp.
5
DD010_A --
JUNE 2006
AMC3100
Dynam ic Supply Current vs Supply Voltage
380 Dynamic Supply Current ( uA ) Dynamic Supply Current( uA ) 360 340 320 300 280 260 240 220 200 2 3 4 5 6 Supply Voltage ( V ) VOUT =1.5V I LOAD=0mA TA=25C 380 Switch Leakage Current (uA) 360 340 320 300 280 260 240 220 200 -50 -25 0 25 50 75 100 125 150 VIN=3.6V VOUT =1.5V I LOAD=0mA
Dynam ic Supply Current vs Tem perature
10 8 6 4
Sw itch Leakage vs Tem perature
VRUN=0V VIN=5V
v SW =5V
v SW =0V 2 0 -50 -25 0 25 50 75 100 125 150
Temperature ( C )
Temperature ( C )
Transient vs Output Current
Line Regulation
1.8 1.7 Output Voltage ( V ) 1.6 1.5 1.4 1.3 1.2 0 1 2 3 4 5 6 Input Voltage ( V ) VOUT =1.5V TA=25C
40 35 Transient Voltage ( mV ) 30 25 20 15 10 5 0 0 100 200 300 400 500 600 700 800 Output Current ( mA )
0.7 Reference Voltage( V )
Reference Voltage vs Tem perature
0.68 0.66 0.64 0.62 0.6 0.58 0.56 0.54 0.52 0.5 -50 -25 0 25 50 75 100 125 150 Temperature (C ) VIN=3.6V I LOAD=100mA
VOUT =1.5V TA=25C
Discontinuous Operation
Start-up from Shutdown
Load Step
VOUT
SW 2V/DIV
RUN 5V/DIV VOUT 1V/DIV
100mV/DIV IL 500mA/DIV
VOUT 10mV/DIV
AC Coupled
IL 200mA/DIV
IL 500mA/DIV 40us/DIV
ILOAD 500mA/DIV
VIN =3.6V 20us/DIV VOUT =1.5V ILOAD=0mA to 600mA
Copyright (c) 2006 ADDtek Corp.
6
DD010_A --
JUNE 2006
AMC3100
Load Step Load Step Load Step
VOUT 100mV/DIV IL 500mA/DIV ILOAD 500mA/DIV
VOUT 100mV/DIV IL 500mA/DIV ILOAD 500mA/DIV
VOUT 100mV/DIV IL 500mA/DIV ILOAD 500mA/DIV
VIN =3.6V 20us/DIV VOUT =1.5V ILOAD=50mA to 600mA
VIN =3.6V 20us/DIV VOUT =1.5V ILOAD=100mA to 600mA
VIN =3.6V 20us/DIV VOUT =1.5V ILOAD=200mA to 600mA
Copyright (c) 2006 ADDtek Corp.
7
DD010_A --
JUNE 2006
AMC3100
APPLICATION INFORMATION The basic AMC3100 application circuit is shown in Figure 1. External component selection is driven by load requirement:
Adjustable Output Voltage:
In adjustable version, the output voltage is set by the below formula (1):
R1 V OUT = 0 .6V 1 + R2
R1 V OUT - 1 0 . 6V
0.6VVOUT5.5V
(1)
The external resistor divider sets the output voltage (see figure 1). Choose R1 around 1M, R2 is then given by:
R2 =
VOUT2.5V VIN2.5V to 5.5V Rectified L1
2.2uH
Table 1- Resistor Selection vs. Adjust Output Voltage.
R1
1M
C1
22pF
VOUT 1.2V 1.5V
COUT
10uF
R1 1M, 1% 1M, 1% 1M, 1% 1M, 1% 1M, 1%
R2 1M, 1% 667K, 1% 500K, 1% 316K, 1% 222K, 1%
VIN
SW
FB
AMC3100-ADJ
4.7uF
R2
316K
CIN
RUN
1.8V 2.5V 3.3V
GND
Figure 1
Inductor selection:
For most applications, the value of the inductor will fall in the range of 1uH to 4.7uH. Its value is chosen based on the desired ripple current. Large value inductors lower ripple current, and small value inductors result in higher ripple currents. Higher VIN or VOUT also increases the ripple current as shown in the formula (2):
I L = VOUT fL VOUT 1 - VIN
Where, f = operating frequency, andIL = ripple current in the inductor.
(2)
COUT selection:
The output capacitor keeps output voltage ripple small and ensures regulation loop stable. The output capacitor impedance shall be low in switching frequency. The output rippleVOUT approximately:
1 VOUT I L ESR + 8 fCOUT
Where, COUT = output capacitance.
8 DD010_A -JUNE 2006
Copyright (c) 2006 ADDtek Corp.
AMC3100
PACKAGE
TSOT-23-5L
Note: All dimensions in mm.
Copyright (c) 2006 ADDtek Corp.
9
DD010_A -- JUNE 2006
AMC3100
IMPORTANT NOTICE
ADDtek reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. ADDtek integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. Use of ADDtek products in such applications is understood to be fully at the risk of the customer. In order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. ADDtek assumes to no liability to customer product design or application support. ADDtek warrants the performance of its products to the specifications applicable at the time of sale.
ADDtek Corp. 9F, No. 20, Sec. 3, Bade Rd., Taipei, Taiwan, 105 TEL: 2-25700299 FAX: 2-25700196
Copyright (c) 2006 ADDtek Corp. 10 DD010_A -- JUNE 2006

▲Up To Search▲

Price & Availability of AMC3100

	To Download AMC3100 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .