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19-3603; Rev 0; 3/05
MAX5072 Evaluation Kit
General Description
The MAX5072 evaluation kit (EV kit) is a fully assembled and tested circuit board that contains all the components necessary to evaluate the performance of the MAX5072. The MAX5072 is a dual-output DC-DC converter. One of the outputs is configured as a step-down converter (converter 1), while converter 2 is configured as a step-up converter. The EV kit is powered from a DC supply providing 5.5V to 16V. The EV kit can be reconfigured for an input voltage range between 4.5V to 5.5V. The MAX5072 EV kit is capable of delivering 3.3V at 2A from the step-down converter output and 12V at up to 0.22A from the step-up converter output. The MAX5072 switching frequency is set to 2.2MHz and the two outputs switch 180 out of phase. A SYNC input facilitates external frequency synchronization. Moreover, a CLKOUT output provides a clock signal that is 90 out of phase with respect to the step-up converter, allowing four-phase operation using two MAX5072 ICs in master-slave configuration. The MAX5072 includes a power-good output for converter 1, a reset output, and a manual reset input. In addition, each output, can be shut down individually. The MAX5072 features a power-fail output, which provides a logic-low when the input voltage drops below a preprogrammed threshold. The MAX5072 is available in a thermally enhanced 32-pin thin QFN package.
Features
5.5V to 16V Input Supply Voltage Range 4.5V to 5.5V Input Supply Voltage Range (Configurable) 3.3V at 2A Output (Step-Down Converter) 12V at 0.22A Output (Step-Up Converter) 180 Out-of-Phase Operation Reduces Input Capacitance Clock Output for Four-Phase Operation Programmable Switching Frequency (200kHz to 2.2MHz) Individual Enable Inputs, SYNC Input, and Manual Reset Input Power-On Reset Output and Power-Fail Output Low-Cost Solution Fully Assembled and Tested
Evaluates: MAX5072
Ordering Information
PART MAX5072EVKIT TEMP RANGE 0C to +70C IC PACKAGE 32 TQFN-EP*
*EP = Exposed paddle.
Component List
DESIGNATION C1, C16 QTY 2 DESCRIPTION 10F 20%, 16V X5R ceramic capacitors (1206) TDK C3216X5R1C106M 1F 10%, 25V X7R ceramic capacitor (0805) TDK C2012X7R1E105K 0.1F 10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H104K 47F 20%, 10V aluminum electrolytic capacitor (6.3mmx6.0mm) Sanyo 10CV47EX 100pF 5%, 50V C0G ceramic capacitors (0603) TDK C1608C0G1H101J DESIGNATION C7, C12 QTY 2 DESCRIPTION 560pF 5%, 50V C0G ceramic capacitors (0603) TDK C1608C0G1H561J 4.7F 10%, 6.3V X5R ceramic capacitor (0603) TDK C1608X5R0J475K 0.22F 20%, 16V X7R ceramic capacitors (0603) TDK C1608X7R1C224M 2200pF 10%, 50V C0G ceramic capacitor (0603) TDK C1608X7R1H222K 22pF 5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H220J
C2
1
C8
1
C3, C13, C15, C17
4
C9, C20
2
C4
1
C10
1
C5, C6
2
C11
1
Component List continued on next page. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX5072 Evaluation Kit Evaluates: MAX5072
Component List (continued)
DESIGNATION C14 QTY 1 DESCRIPTION 22F 10%, 16V X5R ceramic capacitor (1210) TDK 3225X5R1C226K 1F 10%, 10V X7R ceramic capacitor (0603) TDK C1608X7R1A105K 150F 20%, 25V aluminum electrolytic capacitor (case size F or 8.3mm x 8.3mm) Panasonic EEVFK1E151P 200mA 30V Schottky diode (SOD-123) Diodes Inc. BAT42W 3A 40V Schottky rectifier (SMB) Diodes Inc. B340LB 2A 40V Schottky rectifier (SMB) Diodes Inc. B240 Not installed, 3-pin header Not installed, 2-pin header 2-pin headers 6-pin header 4.7H, 4.8A, 18m inductor Pulse P0751.472 Sumida CDR95NP-4R7MC DESIGNATION L2 R1 R2 R3 R4, R11, R12, R13, R17 R5 R6 R7 R8 R9 R10 R14, R15, R16 R18 U1 SW1 None None QTY 1 1 1 1 5 1 1 1 1 1 1 3 1 1 1 3 1 DESCRIPTION 4.7H, 1.8A, 90m inductor Pulse PG0063.472 133k 1% resistor (0603) 42.2k 1% resistor (0603) 2.21k 1% resistor (0603) 10.0k 1% resistors (0603) 5.62k 1% resistor (0603) 22.1k 1% resistor (0603) 1k 1% resistor (0603) 68.1k 1% resistor (0603) 4.87k 1% resistor (0603) 110k 1% resistor (0603) 100k 5% resistors (0603) 4.7 5% resistor (0603) MAX5072ETJ (32-pin TQFN, 5mm x 5mm) Pushbutton switch (normally open) Shunts MAX5072 PC board
C18
1
C19
1
D1
1
D2 D3 JU1 JU2 JU3, JU4, JU5 J1 L1
1 1 0 0 3 1 1
Component Suppliers
SUPPLIER Diodes, Inc. Panasonic Pulse Engineering Sanyo Electronic Device (U.S.A) Corporation Sumida TDK PHONE 805-446-4800 714-373-7366 858-674-8100 619-661-6835 847-545-6700 847-803-6100 FAX 805-446-4850 714-737-7323 858-674-8262 619-661-1055 847-545-6720 847-390-4405 WEBSITE www.diodes.com www.panasonic.com www.pulseeng.com www.sanyodevice.com www.sumida.com www.component.tdk.com
Note: Indicate that you are using the MAX5072 EV kit when contacting these component suppliers.
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MAX5072 Evaluation Kit
Quick Start
Recommended Equipment
* Adjustable 5.5V to 16V, 3A DC power supply * Two electronic loads (e.g., HP6060B) * Two voltmeters Converter 2 (VOUT2) is configured as a step-up converter. Converter 1's output provides power to the converter 2 input. VOUT2 generates 12V and can provide up to 0.22A of current. Capacitors C10, C11, and C12 and resistors R6 and R7 provide a compensation network for VOUT2 on the MAX5072 EV kit. The switching frequency for each converter is set to 2.2MHz by resistor R5. The internal oscillator switching frequency of the MAX5072 is two times the individual converter switching frequency. To set the individual converter switching frequency between 200kHz and 2.2MHz, select a different resistor value for R5. Refer to the Internal Oscillator section in the MAX5072 IC data sheet for instructions on calculating R5. Each converter is switching 180 out of phase with respect to the other converter.
Evaluates: MAX5072
Procedure
The MAX5072 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Connect a voltmeter to the VOUT1 and PGND pads. 2) Verify that the jumpers JU3, JU4, and JU5 do not have a shunt installed. 3) Connect a voltmeter to the VOUT2 and PGND pads. 4) Connect a 2A electronic load to the VOUT1 and PGND pads. 5) Connect a 0.22A electronic load to the VOUT2 and PGND pads. 6) Connect a 5.5V to 16V DC power supply to the VIN and PGND pads, set the voltage in the range of 5.5V to 16V. 7) Turn on the power supply. 8) Verify that VOUT1 is 3.3V throughout the 5.5V to 16V input voltage range. 9) Verify that VOUT2 is 12V throughout the 5.5V to 16V input voltage range. 10) Turn on both electronic loads. Repeat steps 7 and 8.
Enable (EN1 and EN2)
The MAX5072 EV kit provides separate enable inputs, EN1 and EN2, to individually control or sequence the output voltages. The enable signals EN1 and EN2 are pulled up to VL (5V) by resistors R14 and R15, respectively. The external enable input signal can be connected to pin 1 of header JU4 (JU4-1, EN1), and converter 2's enable input signal can be connected to pin 1 of header JU5 (JU5-1, EN2). The MAX5072 enable pins are active-high and TTL compatible.
Manual Reset Button (SW1)
The MAX5072 EV kit provides a manual reset pushbutton switch (SW1) that is connected to the MR pin of the MAX5072. Push and release the manual reset pushbutton switch to initiate a reset of the circuit.
Reset Output Signal (RST)
The MAX5072 EV kit provides a reset output signal on pin 1 of header J1 (J1-1). The reset pin is pulled up to VOUT1 by a 10k resistor (R13). The MAX5072 RST pin output is pulled low when either VOUT1 or VOUT2 falls below 92.5% of their nominal regulation voltage. Once both outputs exceed 92.5% of their nominal regulated voltages, the RST output goes high after the active-reset timeout period (180ms).
Detailed Description
The MAX5072 EV kit contains two switching DC-DC converters. Each converter can be configured as either a step-down or a step-up converter. The MAX5072's individual converter switching frequency can be set within the 200kHz to 2.2MHz range. The EV kit is designed to operate from a DC power supply that can provide 5.5V to 16V and 3A of current. The EV kit can be reconfigured for a 4.5V to 5.5V input voltage range by shorting jumper JU2. Converter 1 (VOUT1) is configured as a step-down converter. VOUT1 generates 3.3V and can provide up to 2A of current. Capacitors C5, C6, and C7 and resistors R3 and R4 provide a compensation network for VOUT1 on the MAX5072 EV kit.
Power-Good Output (PGOOD1)
Converter 1 provides a power-good output signal. The PGOOD1 is pulled up to VOUT1 by a 10k resistor R12. When VOUT1 drops below 92.5% of its nominal regulated voltage, PGOOD1 is pulled low. The PGOOD1 output signal is available on pin 5 of header J1 (J1-5).
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MAX5072 Evaluation Kit Evaluates: MAX5072
Power-Fail Output (PFO)
The MAX5072 EV kit features a power-fail output (PFO) on pin 4 of header J1 (J1-4) to provide an advance signal before the outputs drop out of regulation. PFO is pulled up to VL (5V) by a 10k resistor (R17). The PFO output is pulled low when the input voltage VIN drops below 9.6V. The threshold voltage is set by resistors R10 and R11. To set a different threshold voltage for the PFO, select different values for resistors R10 and R11. Refer to the Dying Gasp Comparator section in the MAX5072 IC data sheet for selecting the values for R10 and R11.
Jumper Selection
Input Source for Converter 2 (JU1) The MAX5072 EV kit features an option to select the input source for converter 2. Jumper JU1 selects the input source for converter 2 on the MAX5072 EV kit. Table 1 lists the selectable JU1 jumper options. Note that jumper JU1 is not installed and is shorted between pin holes 1 and 2 by a PC board trace. To utilize jumper JU1, cut open the PC board trace between pin holes 1 and 2, and install a shorting wire between pin holes 2 and 3.
Synchronization Input (SYNC)
The MAX5072 EV kit provides a synchronization (SYNC) input that enables the MAX5072 to synchronize with external systems. The synchronization frequency is two times the individual converter switching frequency. To synchronize the MAX5072 EV kit with an external clock, connect a 4.4MHz TTL clock signal to pin 3 of header J1 (J1-3).
Table 1. Jumper JU1 Functions
SHORT LOCATION 1-2 (Shorted, default) 2-3 CONVERTER 2 INPUT SOURCE VOUT1 VIN
Clock Output (CLKOUT)
The MAX5072 EV kit provides a clock output (CLKOUT) that enables two MAX5072 EV kits to be connected in a master-slave configuration operating in four-phase mode. The CLKOUT is 90 phase-shifted with respect to the internal switch turn-on edge. The CLKOUT is two times the individual converter switching frequency. Feed the CLKOUT output signal of the master EV kit to the SYNC input of the slave EV kit. The effective input ripple switching frequency will be four times the individual converter's switching frequency. The CLKOUT output is available on pin 6 of header J1 (J1-6).
Input Voltage Range (JU2) The MAX5072 EV kit can be reconfigured for an input voltage range between 4.5V to 5.5V by shorting jumper JU2. Jumper JU2 selects the input voltage range for the MAX5072 EV kit. Table 2 lists the selectable JU2 jumper options. Note that jumper JU2 is not installed. To utilize jumper JU2, install a shorting wire between its pin holes.
Table 2. Jumper JU2 Functions
SHORT LOCATION Not Installed (Default) Installed EV KIT INPUT VOLTAGE RANGE (V) 5.5 to 16 4.5 to 5.5
Frequency Select (FSEL1)
The MAX5072 EV kit provides an option to reduce the converter 1 switching frequency to one-half of converter 2. As configured, the MAX5072 FSEL1 pin is pulled up to VL (5V) by a 100k resistor (R16). When FSEL1 is high, converter 1's switching frequency is the same as converter 2's switching frequency. To reduce converter 1's switching frequency to one-half of converter 2 install a shunt on jumper JU3.
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MAX5072 Evaluation Kit
Converter 1 Frequency Selection, FSEL1 (JU3) The MAX5072 EV kit provides an option to reduce the converter 1 switching frequency to one-half of converter 2. Jumper JU3 selects the switching frequency for converter 1 on the MAX5072 EV kit. Table 3 lists the selectable JU3 jumper options. Converter 1 Enable, EN1 (JU4) The MAX5072 EV kit provides an option to disable converter 1. Use jumper JU4 to disable converter 1 on the MAX5072 EV kit (see Table 4). Converter 2 Enable, EN2 (JU5) The MAX5072 EV kit provides an option to disable converter 2. Use jumper JU5 to disable converter 2 on the MAX5072 EV kit (see Table 5).
Evaluates: MAX5072
Table 4. Jumper JU4 Functions
SHUNT LOCATION Not Installed (Default) Installed EN1 CONNECTED TO VL (through resistor R14) SGND CONVERTER 1 Enabled Disabled
Table 3. Jumper JU3 Functions
SHUNT LOCATION Not Installed (Default) Installed FSEL1 CONNECTED TO VL (through resistor R16) SGND CONVERTER 1'S SWITCHING FREQUENCY Same as Converter 2 One-half of Converter 2
Table 5. Jumper JU5 Functions
SHUNT LOCATION Not Installed (Default) Installed EN2 CONNECTED TO VL (through resistor R15) SGND CONVERTER 2 Enabled Disabled
_______________________________________________________________________________________
5
MAX5072 Evaluation Kit Evaluates: MAX5072
(SHORT) (PC BOARD TRACE) VOUT1 R10 110k 1% C17 0.1F SGND VIN PGND C19 150F 25V VL C1 10F 16V C2 1F 25V R18 4.7 D1 C3 0.1F 26 27 D2 SOURCE1 SOURCE1 SOURCE2 SOURCE2 31 32 R8 68.1k 1% R9 4.87k 1% L2 4.7H D3 C14 22F 16V C15 0.1F 50V VOUT2 PGND R11 10k 1% 1 JU1 2 3 VIN C16 10F 16V
VIN 21 22
12 V+ DRAIN1 DRAIN1
10 PFI DRAIN2 DRAIN2 3 4
VL BST2/VDD2 23 BST1/VDD1 2 C13 0.1F
VOUT1 PGND C18 1F 10V C4 47F 10V R1 133k 1% R3 2.21k 1%
L1 4.7H
FB2 19 R2 42.2k C6 1% 100pF 18 C5 100pF R4 10k 1% VL C7 560pF C20 0.22F 16V COMP1 FB1 U1
6
MAX5072
COMP2 7
C11 22pF
C12 560pF
R7 1k 1%
VIN JU2 C8 4.7F 6.3V
13 14
RST VL VL SYNC PFO
17
C10 2200pF
R6 22.1k 1%
R13 10k VOUT1 1% J1-1 J1-2
9 8
J1-3 J1-4
R17 10k 1%
VL
C9 0.22F 16V
15
BYPASS
PGOOD1 CLKOUT
25 1 JU4
VOUT1 J1-5 J1-6 R14 100k VL R12 10k 1% R16 100k R15 100k VL JU3 JU5 VL
R5 5.62k 1%
11
OSC
EN1 FSEL1
20 24
SW1 16 MR EN2 PGND PGND SGND 30 28 29
5
Figure 1. MAX5072 EV Kit Schematic
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MAX5072 Evaluation Kit Evaluates: MAX5072
Figure 3. MAX5072 EV Kit PC Board Layout--Component Side
Figure 2. MAX5072 EV Kit Component Placement Guide-- Component Side
_______________________________________________________________________________________
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MAX5072 Evaluation Kit Evaluates: MAX5072
Figure 4. MAX5072 EV Kit PC Board Layout--GND Layer 2
Figure 5. MAX5072 EV Kit PC Board Layout--Inner Trace Layer 3
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MAX5072 Evaluation Kit Evaluates: MAX5072
Figure 6. MAX5072 EV Kit PC Board Layout--Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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