High Efficiency Synchronous Step-Down Converter with efficiency 800mA
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SP6651EB Evaluation Board Manual
High Efficiency Synchronous Step-Down Converter with efficiency 800mA Output Current, only 20uA Quiescent Current 2.7V-6.5V Input Voltage range, Output Adjustable down 0.8V MSOP Package Ceramic Capacitors small, profile Power Supply Ideal PDAs, Digital Cameras, Wireless Modems, Cellular Telephones DESCRIPTION SP6651A Evaluation Board designed help user evaluate performance SP6651A single Li-Ion battery Step-Down DC-DC Converter. SP6651A operates from 2.7V 6.5V input, with highest efficiency range 3.0V 4.2V where Li-Ion battery most energy. SP6651A evaluation board complete power supply circuit provide ease evaluation DC/DC Converter performance. FIGURE SP6651A 3.3V OUTPUT EVALUATION BOARD SCHEMATIC
6.5VDC
22uF 10.0
BLON
BLON PGND
10uH
Vout 3.3V 800mA
825K
22pF
COUT 22uF 261K
SP6651A
1.0uF
FIGURE SP6651A 1.5V OUTPUT EVALUATION BOARD SCHEMATIC
6.5VDC
22uF 10.0
BLON
BLON PGND
10uH
Vout 1.5V 800mA
226K
22pF
COUT 22uF 261K
SP6651A
1.0uF
USING EVALUATION BOARD Powering SP6651A Circuit Programming UVLO threshold SP6651A Evaluation Board powered from single Li-Ion battery +2.7 +6.5V power supply. Connect with short leads directly "Vin" "Gnd" posts. Note SP6651A will remain "shutdown" until Jumpers applied position Table UVLO threshold programming definition. Table Operating Mode Definition Definition Shutdown. internal circuitry disabled power switches opened. Device enabled, falling UVLO threshold 2.70V Device enabled, falling UVLO threshold 2.85V Device enabled, falling UVLO threshold 3.00V
VOUT PROGRAMMING SP6651A requires feedback resistors control output voltage. Connect appropriate resistors (Table from SP6651A Vout GND. Vout different from that shown Table equation:
Vout
Table SP6651EB BILL MATERIALS
Component COUT RVIN CVIN
3.3V
1.5V
10uH, CDRH5D28-100, Sumida 10uH, CDRH5D28-100, Sumida 22uF, C3225X5R0J226M 22uF, C3225X5R0J226M ceramic 0805 261k 825k 22pF ceramic SP6651AEU 22uF, C3225X5R0J226M 22uF, C3225X5R0J226M ceramic 0805 261k 226k 22pF ceramic SP6651AEU
Table SP6651A ASSIGNMENT
Name PVin BLON
Description
Input voltage power pin. Inductor charging current passes through this pin. Internal supply voltage. Control circuitry powered from this pin. Open drain battery output need pullup supply externally. Vout below threshold pulls this node ground. Vout above threshold, this node open. Digital mode control input. Table definition. Digital mode control input. Table definition. External feedback network input connection. Connect resistor from ground Vout control output voltage. This regulates internal reference voltage 0.8V. Output voltage sense pin. Used internal timing BLON circuitry. Internal ground pin. Control circuitry returns current this pin. Power ground pin. Synchronous rectifier current returns through this pin. Inductor switching node. Inductor tied between this output capacitor create Vout.
Vout PGND
EVALUATION BOARD LAYOUT
FIGURE SP6651AEU COMPONENT PLACEMENT
FIGURE SP6651AEU LAYOUT SIDE
FIGURE SP6651AEU LAYOUT BOTTOM SIDE
ORDERING INFORMATION Model SP6651EB Temperature Range Package Type
.-40°C +85°C.SP6651 Evaluation Board
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