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Sipex SP7650 Manual

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Easy Evaluation for the
SP7650ER 12V Input, 0 to 3A
Output Synchronous Buck
Converter
Built in Low Rds(on) Power FETs
UVLO Detects Both VCC and VIN
High Integrated Design, Minimal
Components
High Efficiency: 90%
Feature Rich: UVIN, Programmable
Softstart, External VCC Supply and
Output Dead Short Circuit Shutdown
SP7650EB SCHEMATIC
RZ2
CZ2
15k,1%
1,000pF
CP1
22pF
fs=300Khz
CF1
100pF
CSS
47nF
12V
VIN
R3
C1
200k,1%
CERAMIC
C1
1210
22uF
X5R
16V
R4
GND
100k,1%
Date: 01/04/05
SP7650 Evaluation BoardManual
Evaluation Board Manual
U1
SP7650
1
PGND
2
PGND
3
PGND
4
GND
5
VFB
VCC
6
COMP
GND
7
UVIN
GND
8
GND
GND
9
SS
BST
10
VIN
11
VIN
12
VIN
13
VIN
R6
464,5%
1210
D1
BZX384B5V6
C2
Vz=5.6V
0.1uF
SP7650
L1
26
LX
6.8uH
25
LX
24
LX
23
LX
22
21
CVCC
2.2uF
20
19
DBST
RBST
18
20
17
SD101AWS
NC
16
LX
CBST
15
LX
6,800pF
14
LX
Notes:
U1 Bottom-Side Layout should has
three Contacts which are
isolated from one of another, QT
& QB Drain Contact and
Controller GND Contact
All resistor & capacitor size
0603 unless other wise specify
Copyright 2005 Sipex Corporation
VOUT
3.30V
RZ3
0-3A
C3
7.15k,1%
R1
22uF
68.1k,1%
6.3V
CZ3
150pF
GND2
R2
C3
21.5k,1%
CERAMIC
1210
X5R

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Summary of Contents for Sipex SP7650

  • Page 1 Contacts which are 1210 isolated from one of another, QT BZX384B5V6 & QB Drain Contact and Vz=5.6V 100k,1% 0.1uF Controller GND Contact All resistor & capacitor size 0603 unless other wise specify Date: 01/04/05 SP7650 Evaluation BoardManual Copyright 2005 Sipex Corporation...

  • Page 2: Using The Evaluation Board

    While the SP7650 Evaluation Board has been tested and delivered with the output set to 3.30V, by simply changing one resistor, R2, the SP7650 can be set to other output voltages. The relationship in the following formula is based on a voltage divider from the output to the feedback pin VFB, which is set to an internal reference voltage of 0.80V.
  • Page 3 Efficiency vs Load Load Regulation 3.305 3.300 3.295 Vin=12V Vin=12V Vout=3.3V Vout=3.3V 3.290 Load Current (A) Load Current (A) Figure 1. Efficiency vs Load Figure 2. Load Regulation Vout Vout Iout (2A/div) Iout (2A/div) Vin=12V Vin=12V Vout=3.3V Vout=3.3V Figure 3. Load Step Response: 1.5->3A Figure 4.
  • Page 4 +5V BIAS SUPPLY APPLICATION SCHEMATIC In this application example, the SP7650ER is power by an external +5V bias supply which current consumption of 20mA Maximum. If this supply is not available than it is recommend Sipex SPX5205 Low-Noise LDO Voltage Regulator. SP7650 VOUT PGND 6.8uH...
  • Page 5 Definitions: Resr := Output Capacitor Equivalent Series Resitance := Output Inductor DC Resistance Vramp_pp := SP7650 Internal RAMP Amplitude Peak to Peak Voltage Conditions: Cz2 >> Cp1 and R1 >> Rz3 Output Load Resistance >> Resr and Rdc Figure 11. Voltage Mode Control Loop with Loop Dynamic for Type III Compensation...
  • Page 6 Select L = 6.8uH => yield ≈ 40% of maximum 3A output current ripple. Select Cout = 22uF Ceramic capacitor (Resr ≈ 4mΩ) fs = 300khz SP7650 internal Oscillator Frequency Vramp_pp = 1.0V SP7650 internal Ramp Peak to Peak Amplitude Step by step design procedures: fco = 300khz / 5 = 60khz fp_LC = 1 / 2π...
  • Page 7 +5V INPUT WITH A TYPE III COMPENSATION APPLICATION SCHEMATIC Figure 12 shows another example of SP7650ER configures for +5V input by simply changing a few external resistors and capacitors components value for delivering a 0- 3A output with excellent line and load regulation. SP7650 VOUT PGND 3.30V 6.8uH...
  • Page 8 PC LAYOUT DRAWINGS Figure 13. SP7650EB Component Placement Figure 14. SP7650EB PC Layout Top Side Figure 15. SP7650EB PC Layout 2 Layer Side...
  • Page 9 Figure 16. SP7650EB PC Layout 3 Layer Side Figure 17. SP7650EB PC Layout Bottom Side...

  • Page 10: Ordering Information

    Table 2: SP7650EB List of Materials 8700 8700 ORDERING INFORMATION Model Temperature Range Package Type SP7650EB…........-40°C to +85°C....…SP7650 Evaluation Board SP7650ER......…. -40°C to +85°C.........……26-pin DFN...
  • Page 11 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Exar SP7650EB...