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19-2352; Rev 0; 2/02
MAX1846 Evaluation Kit
General Description
The MAX1846 evaluation kit (EV kit) contains both the MAX1846 and MAX1847. Both devices are inverting, current-mode, constant-frequency PWM controllers. The MAX1846 circuit is configured for a +12V input and a -5V output at 2A. The MAX1847 circuit is configured for a +3.3V input and a -12V output at 400mA. Each circuit is powered separately so there is no interaction between the two circuits. The MAX1846 is available in a 10-pin MAX package and the MAX1847 is available in a 16-pin QSOP package. The MAX1846 EV kit is a fully assembled and tested surface-mount circuit board. With minimal modification, it can also be used to evaluate other output voltages. o 3V to 16.5V Input Range o MAX1846 Circuit Configured for +12V Into -5V at 2A o MAX1847 Circuit Configured for +3.3V Into -12V at 400mA o Evaluates Both the MAX1846 and MAX1847 Independently o Fully Assembled and Tested
Features
Evaluates: MAX1846/MAX1847
Ordering Information
PART MAX1846EVKIT TEMP RANGE -40C to +85C IC PACKAGE 10 MAX 16 QSOP
Component List
DESIGNATION C1, C11 QTY 2 DESCRIPTION 0.47F 10%, 25V, X7R ceramic capacitors (0805) Murata GRM40X7R474K025AL 22F 20%, 10V, X5R ceramic capacitors (1812) Taiyo Yuden LMK432BJ226MM 0.22F 10%, 25V, X7R ceramic capacitor (0805) Murata GRM40X7R224K025AL 220pF 10%, 50V COG ceramic capacitors (0805) Murata GRM40COG221K050AL 47F 20%, 16V POSCAPs Sanyo 16TPB47M 0.1F 10%, 50V, X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG 1200pF 10%, 50V COG ceramic capacitor (0805) Murata GRM40COG122K050AL 10F 20%, 25V, X5R ceramic capacitors (1812) Taiyo Yuden TMK432BJ106MM 0.047F 10%, 25V, X7R ceramic capacitor (0805) Murata GRM40X7R473K025AL DESIGNATION C17, C18 QTY 2 DESCRIPTION 100F 20%, 10V POSCAPs Sanyo 10TPB100M 390pF 10%, 50V COG ceramic capacitor (0805) Murata GRM40COG391K050AL 1000pF 10%, 50V COG ceramic capacitors (0805) Murata GRM40COG102K050AL 5A, 40V Schottky diodes (SMC) Central Semiconductor CMSH5-40 Jumpers, SIP3, 3-pin headers Shunts 10H, 10A power inductors Coilcraft DO5022P-103 or Coiltronics UP4B-100 -8.0A, -20V P-channel MOSFET Fairchild FDS6375 (SO-8) -8.8A, -30V P-channel MOSFET Fairchild FDS6685 (SO-8) 0 5% resistor (0805) 22k 5% resistors (0805) 10k 5% resistor (0805) 150k 5% resistors (0805)
C20
1
C2, C3, C4
3
C21, C22
2
C5
1
D1, D2 JU1, JU2 JU1, JU2 L1, L2
2 2 2 2
C6, C16
2
C7, C8
2
C9, C19
2
P1 P2 R1 R2, R9 R3 R4, R11
1 1 1 2 1 2
C10
1
C12, C13, C14
3
C15
1
________________________________________________________________ Maxim Integrated Products
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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.
MAX1846 Evaluation Kit Evaluates: MAX1846/MAX1847
Component List (continued)
DESIGNATION R5, R12 R6 R7, R14 R8 R10 R13 R15, R16 U1 U2 None None QTY 2 1 2 1 1 1 2 1 1 1 1 DESCRIPTION 20m 1W 1% sense resistors (2512) Dale WSL-2512-R020-F 95.3k 1% resistor (0805) 10k 1% resistors (0805) Not installed (0805) 8.2k 5% resistor (0805) 40.2k 1% resistor (0805) 100 5% resistors (0805) MAX1847 (16-pin QSOP) MAX1846 (10-pin MAX) MAX1846 data sheet MAX1846 EV kit data sheet
Quick Start
The MAX1846 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.
MAX1847 Output (-12V)
1) Verify that a shunt is across pins 1 and 2 of jumper JU1 (SHDN). 2) Verify that a shunt is across pins 2 and 3 of jumper JU2 (SYNC). 3) Connect a voltmeter to the VOUT pad. 4) Preset a 3V to 5.5V DC power supply to 3V. Turn off power supply. This power supply should be able to supply 3A continuous current. 5) Connect the power supply to the VIN pad. Connect the supply ground to the GND pad. 6) Connect a load up to 400mA between VOUT and GND. 7) Turn on the power supply and gradually increase the input voltage through the 3V to 5.5V range. 8) Verify that VOUT is -12V throughout the +3V to +5.5V input voltage range.
Component Suppliers
SUPPLIER AVX Central Semiconductor Coilcraft Coiltronics (Cooper) Dale Fairchild International Rectifier IRC Kemet Murata Panasonic Sanyo Sprague Sumida Taiyo Yuden Vitramon COMPONENT Capacitors Diodes Inductors Inductors Resistors MOSFETs MOSFETs Resistors Capacitors Capacitors Capacitors Resistors Capacitors Capacitors Inductors Capacitors Resistors PHONE 803-946-0690 516-435-1110 847-639-6400 561-752-5000 402-564-3131 408-721-2181 310-322-3331 512-992-7900 864-963-6300 770-436-1300 201-348-7522 619-661-6835 603-224-1961 847-956-0666 800-368-2496 203-268-6261 WEBSITE www.avxcorp.com www.centralsemi.com www.coilcraft.com www.cooperet.com www.vishay.com/brands/dale/main.html www.fairchildsemi.com www.irf.com www.irctt.com www.kemet.com www.murata.com www.panasonic.com www.secc.co.jp www.vishay.com/brands/sprague/main.html www.remtechcorp.com www.t-yuden.com www.vishay.com/brands/vitramon/main/html
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MAX1846 Evaluation Kit
MAX1846 Output (-5V)
1) Connect a voltmeter to the VOUT1 pad. 2) Connect a "turned off" 12.0V DC power supply to the VIN1 pad. This power supply should be able to supply 2A continuous current. 3) Connect the supply ground to the GND pad. 4) Connect a load up to 2A between VOUT1 and GND. 5) Turn on the power supply and verify that VOUT1 is -5V. is in an ultra-compact 10-pin MAX package and the MAX1847 is in a 16-pin QSOP package.
Evaluates: MAX1846/MAX1847
Jumper Selection
Shutdown Mode The MAX1847 features a shutdown mode that reduces quiescent current. The 3-pin jumper (JU1) selects the shutdown mode for the MAX1847. To enable the MAX1847 shutdown mode, connect pins 2 and 3 on JU1 with the supplied shunt. For normal operation, connect pins 1 and 2. Synchronized Mode The MAX1847 features a synchronized mode that enables the operating frequency to be controlled by an external clock. To utilize the synchronized mode, remove the shunt on jumper JU2 connecting pins 2 and 3 and place it on pins 1 and 2. Connect an external frequency source to the SYNC pad. The external frequency source must be a TTL level and have a 20% to 80% duty cycle. Note: The value of R4 must program an internal oscillator frequency lower than the frequency of the external clock. Refer to the MAX1846/MAX1847 data sheet for more information.
Detailed Description
The MAX1846 EV kit contains two high-efficiency, PWM inverting controllers. The MAX1846 is configured to convert a +12V input to a -5V output and is capable of delivering up to 2A of current. The MAX1847 is configured to convert a +3V to +5.5V input to -12V and will deliver in excess of 400mA depending on the input voltage. Both devices are inverting, current-mode, constant-frequency PWM controllers capable of operating at frequencies from 100kHz to 500kHz with a simple resistor change (R4 and R11). The EV board is configured to operate at 300kHz. Note that for optimum efficiency and stability, other components may need to be optimized, depending on the operating frequency selected. Refer to the MAX1846/MAX1847 data sheet for more information. The MAX1847 can be synchronized to an external clock signal in the same frequency range and also has a shutdown feature. The MAX1846
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MAX1846 Evaluation Kit Evaluates: MAX1846/MAX1847
12V VIN1 GND R8 OPEN C12 10F 25V C13 10F 25V C14 10F 25V R9 22k 1 23 P2 D2 C17 100F 10V C18 100F 10V GND R12 0.02 1W 1% R13 40.2k 1% -5V AT 2A VOUT1 3 C16 220pF COMP
C11 0.47F
1 VL
10 IN EXT 9
4
R10 8.2k C15 0.047F
5 678
U2 MAX1846
CS 8 C22 1000pF 7
R16 100
L2 10H
2 4 R11 150k C19 0.1F
FREQ REF GND 6
PGND
FB
5 C20 390pF
R14 10k 1%
Figure 1. MAX1846 EV Kit Schematic
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MAX1846 Evaluation Kit Evaluates: MAX1846/MAX1847
3V TO 5.5V VIN GND C2 22F 10V R1 0 C1 0.47F 2 VL 1 2 3 SYNC 1 2 3 JU2 16 SYNC 56 78 D1 C7 47F 16V C8 47F 16V GND -12V AT 400mA VOUT JU1 8 SHDN EXT 14 4 15 IN 1 23 P1 C3 22F 10V C4 22F 10V
R2 22k
U1
R3 10k 4 C6 220pF
MAX1847
COMP CS N.C. N.C.
13 9 7 12 C21 1000pF
R15 100
L1 10H
C5 0.22F
R5 0.02 1W 1%
R6 95.3k 1%
3 5 R4 150k C9 0.1F
FREQ REF
PGND
FB POL 1 GND GND 10 11
6 C10 1200pF R7 10k 1%
Figure 2. MAX1847 EV Kit Schematic
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MAX1846 Evaluation Kit Evaluates: MAX1846/MAX1847
Figure 3. MAX1846 EV Kit Component Placement Guide-- Component Side
Figure 4. MAX1846 EV Kit PC Board Layout--Component Side
Figure 5. MAX1846 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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