|
|
Part: EL7562CU
Category:
Description: Pwm, DC-DC, Step-down (Buck), 2A, With Power Transistors, Vin=4.5/5.5V, Vout =1.0/3.8V
Company: Intersil Corporation
Datasheet: Download EL7562CU datasheet File size : 485 kB
Request For quote: Find where to buy EL7562CU
Datasheet text preview:
®
EL7562
D a ta Sheet Jun e 26, 2002 FN7295
Monolithic 2Amp DC:DC Step-Down Regulator
The EL7562 is an integrated, synchronous step-down regulator with output voltage adjustable from 1.0V to 3.8V. It is capable of delivering 2A continuous current at up to 95% efficiency. The EL7562 operates at a constant frequency pulse width modulation (PWM) mode, making external synchronization possible. Patented on-chip resistorless current sensing enables current mode control, which provides cycle-by-cycle current limiting, over-current protection, and excellent step load response. The EL7562 is available in a fused-lead 16-pin QSOP package. With proper external components, the whole converter fits into a less than 0.5 in2 area. The minimal external components and small size make this EL7562 ideal for desktop and portable applications. The EL7562 is specified for operation over the 0°C to +70°C temperature range.
Features
· Integrated synchronous MOSFETs and current mode controller · 2A continuous output current · Up to 95% efficiency · 3.3V or 5V nominal input voltage · Adjustable output from 1V to 3.8V · Cycle-by-cycle current limit · Precision reference · ±0.5% load and line regulation · Adjustable switching frequency to 1MHz · Oscillator synchronization possible · Internal soft-start · Over-temperature protection · Under-voltage lockout · 16-pin QSOP package
Pinout
EL7562 (16-PIN QSOP) TOP VIEW
Applications
· DSP, CPU core and IO supplies · Logic/Bus supplies · Por table equipment
C3 C4 0.1µF 270pF R3 39
1 SGND 2 COSC 3 VDD 4 PGND 5 PGND 6 VIN 7 VIN
PGND 16 C5 VREF 15 0.1µF FB 14 VDRV 13 LX 12 LX 11 VHI 10 PGND 9 C6 4.7µF VO (3.3V, 2A) 100µF C7 R2
· DC:DC converter modules · GTL + Bus power supply
R1 2.37k 1k L1
Ordering Information
PART NUMBER EL756 2CU PAC KAGE 16-Pin QSOP TAPE & REEL PKG. NO. M D P 0040
C1
C2
100µF 0.1µF
0.1µF VIN (4.5V5.5V)
8 EN
Please refer to page 4 for 3.3V input Application Diagram Manufactured under U.S. Patent No. 57,323,974
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners.
EL7562
Absolute Maximum Ratings (TA = 25°C)
Supply Voltage between VIN or VDD and GND . . . . . . . . . . . . +6.5V VLX Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VIN +0.3V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V, VDD +0.3V VHI Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V, VLX +6V Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Operating Ambient Temperature . . . . . . . . . . . . . . . . . 0°C to +70°C Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +135°C
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA
DC Electrical Specifications
PARAMETER VREF VREFTC VREFLOAD VRAMP IOSC_CHG IOSC_DIS IVDD+VDRV IVDD_OFF VDD_OFF VDD_ON TOT THYS ILEAK ILMAX RDSON RDSONTC VFB VFB_LINE VFB_LOAD VFB_TC IFB VEN_HI VEN_LO IEN Reference Accuracy
VDD = VIN = 5V, TA = TJ = 25°C, COSC = 270pF, unless otherwise specified. C O N D I T IO N S M IN 1.24 T YP 1 .2 6 50 0 < IREF < 50µA -1 1 .1 5 0.1V < VOSC < 1.25V 0.1V < VOSC < 1.25V VEN = 4V, FOSC = 120kHz EN = 0 2.5 2.6 135 20 EN = 0, LX = 5V (low FET), LX = 0V (high FET) 3 Wafer level test only 60 0 .2 ILOAD = 0A VIN = 5V, VIN = 10%, ILOAD = 0A 0.1A < ILOAD < 1A -40°C < TA < 85°C, ILOAD = 0.5A VFB = 0V 0.970 0. 985 0 .5 0 .5 ±1 100 3 .2 1 VEN = 0 -4 - 2.5 20 0 4 1.000 12 0 20 2 1 200 8 6. 5 1.5 2.7 3 MA X 1.28 UNIT V ppm/° C % V µA mA mA mA V V °C °C µA A m m/°C V % % % nA V V µA
DESCRIPTION
Reference Temperature Coefficient Reference Load Regulation Oscillator Ramp Amplitude Oscillator Charge Current Oscillator Discharge Current VDD+VDRV Supply Current VDD Standby Current VDD for Shutdown VDD for Startup Over-temperature Threshold Over-temperature Hysteresis Internal FET Leakage Current Peak Current Limit FET On Resistance RDSON Tempco Output Initial Accuracy Output Line Regulation Output Load Regulation Output Temperature Stability Feedback Input Pull Up Current EN Input High Level EN Input Low Level Enable Pull Up Current
2
EL7562
Closed-Loop AC Electrical Specifications
PARA METER FOSC tSYNC MSS tBRM tLEB DMAX DESCRIPTION Oscillator Initial Accuracy Minimum Oscillator Sync Width Soft-start Slope FET Break Before Make Delay High Side FET Minimum On Time Maximum Duty Cycle VS = VIN = 5V, TA = TJ = 25°C, COSC = 270pF, unless otherwise specified. C O N D I T IO N S M IN 493 TYP 580 25 0.5 15 150 95 M AX 6 67 UNIT k Hz ns V /ms ns ns %
Pin Descriptions
PIN NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PIN NAME S GND COSC V DD P GND P GND V IN V IN EN P GND VHI LX LX VDRV FB VREF PGND Control circuit negative supply Oscillator timing capacitor; FOSC can be approximated by: FOSC (kHz) = 0.1843/COSC, COSC in µF Control circuit positive supply Ground return of the regulator; connected to the source of the low-side synchronous NMOS power FET Ground return of the regulator; connected to the source of the low-side synchronous NMOS power FET Power supply input of the regulator; connected to the drain of the high-side NMOS power FET Power supply input of the regulator; connected to the drain of the high-side NMOS power FET Chip enable, active high; a 2µA internal pull-up current enables the device if the pin is left open Ground return of the regulator Positive supply of the high-side driver Inductor drive pin; high current digital output whose average voltage equals the regulator output voltage Inductor drive pin; high current digital output whose average voltage equals the regulator output voltage Positive supply of the low-side driver and input voltage for the high-side boot strap Voltage feedback input; connected to an external resistor divider between VOUT and GND; a 125nA pull-up current forces VOUT to VS in the event that FB is floating Bandgap reference bypass capacitor; typically 0.1µF to GND Ground return of the regulator PIN FUNCTION
3
EL7562 Application Diagram for 3.3V Input
C3 0.1µF R3
C4 270pF
1
SGND
PGND 16 C5
2
COSC
VREF 15 0.1µF
3 39 4
VDD
FB 14
D2
D3 C9
D4
PGND
VDRV 13 C8 0.1µF 0.1µF L1 VO (2.5V, 2A) C7 100µF R2 1.54k R1 1k
C1 100µF
C2 0.1µF
5
PGND
LX 12
6
VIN
LX 11
C6 0.1µF
4.7µF
7 VIN (3V-3.6V) 8
VIN
VHI 10
EN
PGND EL7562 (16-Pin QSOP)
9
4
EL7562 Typical Performance Curves
Efficiency vs IO VIN=5V 100 95 90 85 80 75 70 65 60 0.1 FS=500kHz L=Coilcraft DO3316P-472 0 1 Load Current IO (A) 2 0 0 .5 1 Load Current IO (A) 1 .5 2 VO=1.8V Power Loss (W) Efficiency (%) VO=2.5V VO=3.3V 0.7 0.6 0.5 VO=1.5V VO=1.2V 0.4 0.3 0.2 0.1 VO=1.5V VO=3.3V VO=2.5V VO=1.8V VO=1.2V Power Loss vs IO VIN=5V
Efficiency vs IO VO=3.3V 100 VIN=4.5V 95 90 Efficiency (%) 85 80 75 70 65 60 0 0.5 1 Load Current IO (A) 1 .5 2 VIN=5V Output Voltage (%) 0.4 0.2 0 -0.2 -0.4 -0.6 0.6 0.8
Load Regulation VO=3.3V
VIN=5.5V
VIN=5.5V
VIN=5V
VIN=4.5V
0
0 .5
1 Load Current IO (A)
1 .5
2
Line Regulation VO=3.3V 0.6 1.258 1.256 IO=0.1A 0.2 IO=1A VREF (V) VO (%) 1.254 1.252 1.25 1.248 1.246 -0.4 1.244 1.242 4.7 4.9 VIN (V) 5.1 5 .3 5.5
VREF vs Temperature
0.4
0
-0.2
IO=2A
-0.6 4.5
0
10
20
30
40
50
60
70
80
90
100 110
Temperature (°C)
5
Others parts begin by el
EL-1 EL-2 EL-3 EL-4 EL-5 EL-6 EL-7 EL-8 EL-9 EL-10 EL-11 EL-12 EL-13 EL-14 EL-15 EL-16 EL-17 EL-18
|
|
|
