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SP4446 Evaluation Board Manual
Easy Evaluation for the SP4446 2V to 7V input to 25 to 30V Output SP4446 provides up to 30mA output current High Efficiency: up to 80% SOT23-5 Package & SMT components for small, low profile Power Supply
DESCRIPTION The SP4446 Evaluation Boards are designed to help the user evaluate the performance of the SP4446 for use as a single or dual cell input to +5V output DC-DC Converter. The SP4446 have a fixed output voltage programmed to +5V (consult the factory for other voltage options). The evaluation board is a completely assembled and tested surface mount board which provides easy probe access points to all SP4446 Inputs and Outputs so that the user can quickly connect and measure electrical characteristics and waveforms. SP4446 EVALUATION BOARD SCHEMATIC
1.2V to 5V
Murata LQH32CN100K11 L1 10uH 0.45A D1 MBR0530
5 Vin SW
Vout
R1 1.0M C3 2.2uF
J1 SHDN
1 2 3
C4 4.7uF
4
1
C1 330pF
3
SHDN
GND
FB
LOAD
2
U1 SP4446
C2 Open
R2 61.9K
USING THE EVALUATION BOARD 1) Powering Up the SP4446 Circuit The SP4446 Evaluation Board can be powered from inputs from a +1.2V to +7.0V. Connect with short leads directly to the "Vin" and "Gnd" posts. Monitor the Output Voltage and connect the Load between the "Vout" post and the 2nd "GND" post. 2) Using the J1 Jumper: Enabling the SP4446 Output and using the Shutdown Mode The SP4446 output will be Enabled if the J1 Jumper is in the top or pin 1 to 2 position. If J1 is in the pin 2 to 3 position, the Shutdown pin is brought to GND, which puts the SP4446 in the low quiescent Shutdown Mode. 3) Selecting the Inductor In selecting an inductor, the saturation current specified for the inductor needs to be greater then the SP4446 peak current to avoid saturating the inductor, which would result in a loss in efficiency and could damage the inductor. The SP4446 evaluation board uses a Murata 10uH inductor with an Isat value of 450mA and a DCR of 0.39ohms, which easily handles the Ipeak of 350mA of the SP4446 and will deliver high efficiencies. Other inductors could be selected provided their Isat is greater than the Ipeak of the SP4446. POWER SUPPLY DATA
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Figure 1. SP4446 Efficiency Vs Output Current (Vout = 5V)
Figure 2. SP4446 Line/Load Rejection Vs Output Current (Vout = 5V)
Figure 3. SP4446 No-Load Battery Current Vs Vbatt (Vout = 5V) 3
TABLE1: SP4446 LIST OF MATERIALS
Ref. Des. Qty. 1 1 1 1 1 1 1 1 1 1 4 1 1 Manufacturer Sipex Corp. Sipex Corp. Murata Murata Murata Murata On-Semi Panasonic Panasonic Mill-Max Sullins Sullins Part Number 146-6478-00 SP4446EK GRM1885C1H331JA01B GRM32RR71E225KC01B GRM31CR61A475KA01B LQH32CN100K11 MBR0530 ERJ-3EKF1004 ERJ-3EKF6192 0300-115-01-4727100 PTC36SAAN STC02SYAN Layout Size LxWxH 1"x1.5" SOT23-5 0603 1210 1206 3.2x2.5x2mm SOD-123 0603 0603 .042 Dia .23x.12 .2x.1 Component SP4446 Eval PC Board 5-pin SOT23 Step-Up DC/DC Conv Ceramic 330pF SM open Ceramic 25V 2.2uF SM Ceramic 10V 4.7uF SM 10uH, 0.45A, 0.39ohm, SM Inductor Schottky Diode 30V, 0.5A 1M ohm 1/8W 1% 0603 SM 61.9K ohm 1/8W 1% 0603 SM Test Point Female Pin 3-Pin Header Shunt Vendor Sipex 978-667-8700 Sipex Murata 770-436-1300 Murata 770-436-1300 Murata 770-436-1300 Murata 770-436-1300 On-Semi Digi-Key 800-344-4539 Digi-Key 800-344-4539 Digi-Key 800-344-4539 Digi-Key 800-344-4539 Digi-Key 800-344-4539
U1 C1 C2 C3 C4 L1 D1 R1 R2 TP J1
ORDERING INFORMATION Model Temperature Range Package Type
SP4446KEB........................................ -40C to +85C...................SP4446 Evaluation Board SP4446EK..............................................-40C to +85C......................................5-pin SOT23
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