IRF IRDC3065 The iru3065 controller is designed to provide solutions for the applications requiring low power on board switching regulators. the iru3065 is specifically Datasheet

IRDC3065
IRU3065 EVALUATION BOARD USER GUIDE
INTRODUCTION
SPECIFICATION DATA
The IRU3065 controller is designed to provide solutions for the applications requiring low power on board
switching regulators. The IRU3065 is specifically
designed for positive to negative conversion and uses
few components for a simple solution. The IRU3065
operates at high switching frequency (up to 1.5MHz),
resulting in smaller components. The output voltage
can be set by using an external resistor divider. The
stability over all conditions is inherent with this architecture without any compensation. The device is
available in the standard 6-Pin SOT-23.
Inputs:
JP1: Optional VDD input. Default VDD is connected
to VCC through a charge pump.
JP2: Optional Vref input. If accurate output is re
quired, Vref should be connected to a accurate reference voltage
JP4: 5V Bus input and Vcc input (default connection).
The output voltage will be equal to input voltage with
negative sign.
(see the IRU3065 data sheet for detailed description).
Rev. 1.0
10/20/04
Outputs:
JP3. Vout=-5V @200mA.
Switching frequency
Fs(MAX)=1.2 MHz
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1
IRDC3065
SCHEMATIC
1
2
4
3
D
D
JP4
Vin
VIN/VCC
R2
GND
VGate
JP1
R7
VDD
R1
Vdd
C3 +
C
U1
GND
1
VGATE
VCC
C1 +
D1
C
C4 +
Q1
MOSFET P
Vcc
6
IRU3065
2
GND
VDD
VSNS
ISNS
J1
5
L2
3
JP3
L3
D2
4 Isns
Vo
JP2
C5
VO
C6
R3
+
GND
GND
+
VREF/VCC
R4
B
B
Vsns
R5
R6
VRef
Title
A
Size
A
Number
Revision
A
Date:
File:
1
2
2-Nov-2004
Sheet of
E:\mqiao\IR_dcdc_IC\Iru3065\protel\JE3065~1.DDB
Drawn By:
3
4
Figure 1 - Schematic of IRU3065 evaluation-board.
Bill of Material (BOM)
Ref Designator
Q1
U1
D1
D2
L2
C1
C3
C6,C4
R4, R5
R3
R1,R7
R2,R6
L3
C5
JP1,2,3,4
J1
Bumpon
2
Description
MOSFET
Controller
Diode
Diode
Inductor
Ceramic Cap
Ceramic Cap
Ceramic Cap
Resistor
Resistor
Resistor
Resistor
Inductor
Ceramic Cap
Terminal
Scope Probe
Value
PFET
Qty
Fast Switchinh
Fast Switchinh
1.2uA, 2A
1uF, Y5V,16V
100pF, X7R,50V
10uF, X5R, 6.3V
10K, 1%, 0805
0.1Ohm, 0805
Open
Short
Short
Open
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1
1
1
1
1
1
1
2
2
1
2
2
1
1
4
1
4
Part#
IRLML5203
IRU3065
BAT54
10BQ015
LPO1704-122MC
ECJ-2VF1C105Z
ECJ-2VC1H100J
ECJ2FBOJ106M
Any
Any
Manuf
IR
IR
IR
IR
Coilcraft
Panasonic
Panasonic
Panasonic
Any
Any
ED1973-ND
S1012-02-ND
Digi-Key
Digi-Key
3M
Rev. 1.0
10/20/04
IRDC3065
Layout-Top layer and Bottom layer
Rev. 1.0
10/20/04
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3
IRDC3065
Operation Characteristics
Vout(V) vs Iout(mA)
Efficiency versus load current
6
5
70
4
65
Vout(V)
Efficiency(%)
75
60
3
2
55
1
50
0
100
200
300
400
0
0
Iout(mA)
Efficiency(%) with diode
Efficiency(%) with 100 resistor
200
400
600
800
1000
Iout(mA)
Efficiency with 1.2uH inductor, 800k Hz operation
Output voltage (absoutle value) versus load curren
(Vout=-5V, Iocp=400mA)t
Frequency (KHz) versus load current
900
75
800
70
700
Frequency(kHz)
Efficiency(%)
Efficiency versus load current
65
60
55
50
0
100
200
300
500
400
300
200
400
100
Iout(mA)
0
Efficiency(%) with diode
Efficiency(%) with 100ohm resistor
0
200
400
600
800
1000
Iout(mA)
Efficiency with 4.7uH inductor, 250kHz operation
4
600
Frequency versus load current. (Vout=-5V,
Iocp=400mA)t
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Rev. 1.0
10/20/04
IRDC3065
Experimental waveforms
Operation waveform with 450mA, the boundary of
continuous mode and discontinuous mode. The output start out of regulation
Start Up
Operation waveform at 20mA load.
Operation waveform with short output.
Operation waveforms with 250mA load (normal
operation)
Rev. 1.0
10/20/04
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5
IRDC3065
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
6
www.irf.com
Rev. 1.0
10/20/04
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