SP6648UEB [SIPEX]
Evaluation Board Manual; 评估板手册
| 型号： | SP6648UEB |
| 厂家： | 
SIPEX CORPORATION |
| 描述： | Evaluation Board Manual |
| 文件： | 总4页 (文件大小：127K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SP6648
Evaluation Board Manual
ꢀ Easy Evaluation for the
SP6648 Single or Dual Cell
Alkaline to 2V to 5V Output
ꢀ Provides 300mA output at
3.3V output for 2.0V Input
ꢀ High Efficiency: 94%
ꢀ µSOIC Package & SMT
components for small, low
profile Power Supply
DESCRIPTION
The SP6648 Evaluation Board is designed to help the user evaluate the performance of the
SP6648 for use as a single or dual cell input to +3.3V output DC-DC Converter. The output of
the SP6648 is preset to +3.3V or can be adjusted from +2V to +5.5V by manipulating two
external resistors. The evaluation board is a completely assembled and tested surface mount
board which provides easy probe access points to all SP6648 Inputs and Outputs so that the
user can quickly connect and measure electrical characteristics and waveforms.
SP6648 EVALUATION BOARD SCHEMATIC
VBATT
L1
10uH
C1
3.3Vout
+
1
2
3
4
5
10
9
VBATT
VOUT
47uF
SP6648
C4
1uF
LBI
LX
LBI
R1
8
+
C3
C2
LBON
RLIM
SHDN
PGND
GND
FB
LBON
205K
7
47pF
47uF
6
SHDN
RLIM
1.87K
R2
124K
USING THE EVALUATION BOARD
1) Powering Up the SP6648 Circuit
The SP6648 Evaluation Board can be powered from inputs from a +0.95V to +3.3V from 1 or 2
alkaline cells. Connect with short leads directly to the “Vbatt” 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 SP6648 Output and using the Shutdown Mode
The SP6648 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 SP6648 in the low
quiescent Shutdown Mode.
3) Using the Rlim Function
The peak inductor current, IPEAK, is programmed externally by the RLIM resistor connected
between the RLIM pin and GND. The peak inductor current is defined by:
IPEAK = 1400/RLIM
The SP6648 datasheet specifications for RLIM give a range of 1750 to 4000 ohms. Using the
IPEAK equation above gives an IPEAK range of
IPEAK range = 350 to 800mA.
The saturation current specified for the inductor needs to be greater then the peak current to
avoid saturating the inductor, which would result in a loss in efficiency and could damage the
inductor. The SP6648 evaluation board uses a Rlim value of 1.87K for an Ipeak = 750mA to
allow the circuit to deliver up to 180mA for 1.3V input and 400mA for 2.6V input. Other values
could be selected using the above relationships.
4) Using the LBON - Low Battery Output Function
The Low Battery Output function, LBON, is programmed externally by the R3 and R4 resistor
divider connected between Vbatt, the LBI input pin and GND. The LBON is an open drain
output, which is active low and is pulled up by a 1M resistor R5 to Vout. When the LBI
comparator falling threshold of 0.625V is reached, the LBON output goes low as determined by
the relationship:
LBON falling = Vbatt*R4/(R3 +R4)
The SP6648 evaluation board R3 & R4 resistors have been set to trip for a falling battery
threshold of about 2.0V. Using this relationship, other low battery threshold values can be set
by the user.
FIGURE 1: SP6648UEB COMPONENT PLACEMENT
FIGURE 2: SP6648UEB PC LAYOUT TOP SIDE
FIGURE 3: SP6648UEB PC LAYOUT BOTTOM SIDE
TABLE1: SP6648EB LIST OF MATERIALS
Ref. Des. Qty. Manufacturer
Part Number
Layout
Size
Component
Vendor
1
1
2
2
1
1
1
1
1
1
1
1
1
1
5
1
1
Sipex Corp.
Sipex Corp.
Kemet
146-6479-00
SP6648EU
1"x1.5"
uSO-8
"D" size
"V" size
0603
SP6648UEB Eval PC Board
10-pin uSOIC Step-Up DC/DC Conv
47uF 10V SM 0.3ohm ESR
47uF 10V low profile SM 0.3ohm ESR Kemet 847-517-1030
Ceramic 16V 47pF SM
Ceramic 10V 1uF SM 0.02ohm ESR
Sipex 978-667-7800
Sipex
Kemet 847-517-1030
U1
C1,2
C1,2
C3
C4
L1
L1
R1
R2
R3
R4
R5
RLIM
TP
J1
T494C476K010AS
T494V476K010AS
C1608SL1H470K
C1608X5R1A105M
CDRH5D28-100
Kemet
TDK Corp
TDK Corp
Sumida
TDK 847-803-6100
TDK 847-803-6100
0603
6.7x6.5x3.0mm 10uH, 1.3A, 0.065ohm, SM Inductor Sumida 847-956-0666
TDK Corp
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Panasonic
Mill-Max
RLF5018-100MR94 5.6x5.2x2.0mm 10uH, 0.94A, 0.067ohm, SM Inductor TDK 847-803-6100
ERJ-3EKF2053
ERJ-3EKF2493
ERJ-3EKF5493
ERJ-3EKF2493
ERJ-3GEYJ105
ERJ-3EKF1871
0300-115-01-4727100
PTC36SAAN
0603
0603
0603
0603
0603
205K ohm 1/8W 1% 0603 SM
124K ohm 1/8W 1% 0603 SM
549K ohm 1/8W 1% 0603 SM
249K ohm 1/8W 1% 0603 SM
1M ohm 1/8W 5% 0603 SM
1.87K ohm 1/8W 1% 0603 SM
Test Point Female Pin
3-Pin Header
Digi-Key 800-344-4539
800-Digi-Key
800-Digi-Key
800-Digi-Key
800-Digi-Key
800-Digi-Key
800-Digi-Key
800-Digi-Key
800-Digi-Key
0603
.042 Dia
.23x.12
.2x.1
Sullins
Sullins
STC02SYAN
Shunt
ORDERING INFORMATION
Temperature Range
Model
Package Type
SP6648UEB.................................. -40°C to +85°C...................SP6648 Evaluation Board
SP6648EU.....................................-40°C to +85°C......................................10-pin µSOIC
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