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19-3611; Rev 0; 3/05
MAX1947 Evaluation Kit
General Description
The MAX1947 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board demonstrating the low-voltage, skip-mode boost converter. The EV kit provides a 1.8V output voltage capable of sourcing 270mA (typ) load current from a 0.7V to 3.6V input source. The MAX1947 features skip mode to optimize efficiency and battery life. It also contains internal MOSFETs for lower cost and size. The 1.2MHz (max) switching frequency allows the use of small external components. The MAX1947 EV kit is fully assembled and tested. The MAX1947 EV kit can be used to evaluate the MAX1947ETA25, MAX1947ETA30, and MAX1947ETA33 with no PC board modification. o 0.7V to 3.6V Input Voltage Range o 1.8V Output Voltage o Up to 270mA Output Current o No Current-Sense Resistor Needed o 90% Efficiency o Track Mode when VIN > VOUT o Internal MOSFET Switch and Synchronous Rectifier o True ShutdownTM o 1.2MHz (max) Switching Frequency o Surface-Mount Components o Fully Assembled and Tested
Features
Evaluates: MAX1947
Component List
DESIGNATION C1 QTY 1 DESCRIPTION 10F 20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ106ME 22F 20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ226MG Not installed, capacitor (0402) 100F, 6.3V SP polymer Panasonic EEFUD0J101XR 3-pin header 2.2H, 1.2A, 55m inductor Sumida CDRH3D16-2R2 MAX1947ETA18 (8-pin TDFN) Shunt PART MAX1947EVKIT
Ordering Information
TEMP RANGE 0C to +70C IC PACKAGE 8 TDFN (3mm x 3mm)
Note: To evaluate the MAX1947ETA25, MAX1947ETA30, or MAX1947ETA33, request a free sample with the MAX1947EVKIT.
C2 C3 C4 JU1 L1 U1 None
1 0 1 1 1 1 1
Quick Start
Recommended Equipment
* * * 6V, 1A variable power supply Digital multimeter (DMM) Dummy load capable of sinking 200mA
Procedure
The MAX1947 EV kit is fully assembled and tested. Follow these steps to verify board operation: 1) Preset the 6V power supply to 1.2V and turn off the power supply. Do not turn on the power supply until all connections are made. 2) Verify that there is a shunt across pins 1 and 2 of JU1 on the MAX1947 EV kit for normal operation.
True Shutdown is a trademark of Maxim Integrated Products, Inc.
Component Suppliers
SUPPLIER Panasonic Sumida Taiyo Yuden TDK COMPONENT Capacitors Inductors Capacitors Capacitors PHONE 714-373-7366 81-03-3667-3381 408-573-4150 888-835-6646 WEBSITE www.panasonic.co.jp/maco/en/ www.sumida.com www.t-yuden.com www.component.tdk.com
Note: Indicate that you are using the MAX1947 when contacting these suppliers. ________________________________________________________________ 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.
MAX1947 Evaluation Kit Evaluates: MAX1947
3) Connect the positive lead of the power supply to the VBATT pad on the EV kit and the negative lead of the power supply to the GND pad on the EV kit. 4) Connect the positive lead of the DMM to the VOUT pad on the EV kit and the negative lead of the DMM to the GND pad on the EV kit to measure the output voltage. 5) Turn on the power supply and sweep the input voltage from 0.7V to 1.8V. 6) Verify that the output voltage is approximately 1.8V over the entire input range. 7) Set the power supply to 1V. 8) Connect the 200mA load between the VOUT and GND pads on the EV kit. 9) Verify that the output voltage is approximately 1.8V.
Shutdown
The MAX1947 features a True Shutdown mode to minimize quiescent current. During shutdown mode, the output is disconnected from the input and pulls to GND through an internal 500 (typ) resistor. Place a shunt between positions 2 and 3 of JU1 to shut down the MAX1947. Place a shunt between positions 1 and 2 of JU1 for normal operation.
Input Source
When using long input leads during bench evaluation, some oscillation can occur on the supply and translates to instability in the MAX1947 circuit. To counteract this, a bulk capacitor (C4) is added at the input to the circuit. This capacitor is not needed with most battery applications.
Jumper Settings
S Table 1. Jumper JU1 Functions (SHDN Control)
SHUNT LOCATION 1 and 2 2 and 3 SHDN PIN Connected to VBATT Connected to GND OPERATION Normal operation Shutdown mode
Detailed Description
RESET
The MAX1947 utilizes a push-pull RESET output to signal when the output voltage has reached its regulation point. RESET goes high 120ms after the output voltage reaches 90% of its regulation voltage. RESET pulls low immediately after the output falls below 90% of the regulation voltage.
VBATT 0.7V TO VOUT C4 100F C1 10F 8 C3 OPEN 1 2 3 JU1 4
L1 2.2H
GND
6 LX BATT U1 OUT 7
VOUT 1.8V AT 270mA C2 22F
MAX1947ETA18
SHDN
3
GND GND 2
RESET PGND 5
1
RESET
Figure 1. MAX1947 EV Kit Schematic 2 _______________________________________________________________________________________
MAX1947 Evaluation Kit Evaluates: MAX1947
Figure 2. MAX1947 EV Kit Component Placement Guide--Top Silkscreen
Figure 3. MAX1947 EV Kit PC Board Layout--Component Side
Figure 4. MAX1947 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.
3 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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