sp6651a Exar Corporation, sp6651a Datasheet

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sp6651a

Manufacturer Part Number
sp6651a
Description
High Efficiency 800ma Synchronous Buck Regulator
Manufacturer
Exar Corporation
Datasheet

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FEATURES
Date: 5/25/04
The SP6651A is a 800mA synchronous buck regulator which is ideal for portable applications that
use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6651A’s proprietary control loop, 20µA
light load quiescent current, and 0.3Ω power switches provide excellent efficiency across a wide
range of output currents. As the input battery supply decreases towards the output voltage the
SP6651A seamlessly transitions into 100% duty ratio operation further extending useful battery
life. The SP6651A is protected against overload and short circuit conditions with a precise
inductor peak current limit. Other features include programmable under voltage lockout and low
battery detection, externally programmed output voltage down to 1.0V, logic level shutdown
control, and 140°C over temperature shutdown.
DFN Package (3mm x 3mm)
Ultra-low 20µA Quiescent Current
98% Efficiency Possible
800mA Output Current
2.7V to 5.5V Input Voltage Range
Output Adjustable Down to 1.0V
No External FET’s Required
1.25A Inductor Peak Current Limit
100% Duty Ratio Low Dropout Operation
80µA Light Load Quiescent Current
in Dropout
Over Temperature Protection
Logic Shutdown Control
Programmable UVLO and Adaptive
Battery Low Output
BLON
2.7V to 5.5V Input
VI
High Efficiency 800mA Synchronous Buck Regulator
1M
®
22µF
C
IN
SP6651A High Efficiency 800mA Synchronous Buck Regulator
1µF
CV
R
IN
10Ω
VIN
D1
D0
Ideal for portable designs powered with Li Ion battery
P
V
BLON
D1
D0
VIN
IN
SP6651A
1
P
GND
V
GND
OUT
FB
LX
Now Available in Lead Free Packaging
TYPICAL APPLICATION SCHEMATIC
APPLICATIONS
BLON
PDA's
DSC's
MP3 Players
USB Devices
Point of Use Power
PV
V
D1
D0
IN
IN
L1
10µH
1
2
3
4
5
SP6651A
10 Pin DFN
C
22µF
OUT
© Copyright 2004 Sipex Corporation
SP6651A
R
R
200K
F
I
V
800mA
DESCRIPTION
OUT
10
VO
9
8
7
6
CF
22pF
LX
P
GND
V
FB
GND
OUT

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sp6651a Summary of contents

Page 1

... Programmable UVLO and Adaptive Battery Low Output The SP6651A is a 800mA synchronous buck regulator which is ideal for portable applications that use a Li-Ion or 3 cell alkaline/NiCD/NiMH input. The SP6651A’s proprietary control loop, 20µA light load quiescent current, and 0.3Ω power switches provide excellent efficiency across a wide range of output currents ...

Page 2

... Over-Temperature Hysteresis D1,D0 Leakage Current D1,D0 Input Threshold Voltage 0.60 FB Leakage Current Date: 5/25/04 SP6651A High Efficiency 800mA Synchronous Buck Regulator ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation +0.3V IN sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability ...

Page 3

... DRVON BLANK BLANK = Tblank(=100ns) or Toff = Koff/Vout Date: 5/25/04 SP6651A High Efficiency 800mA Synchronous Buck Regulator DESCRIPTION Input voltage power pin. Inductor charging current passes through this pin. Internal supply voltage. Control circuitry powered from this pin. Open drain battery low output. (V ...

Page 4

... ILoad (mA) Figure 3. Line/Load Rejection 3.3V OUT 500 400 300 200 100 0 3.0 3.3 3.6 Vin (V) Figure 5. No Load Battery Current, V Date: 5/25/04 SP6651A High Efficiency 800mA Synchronous Buck Regulator TYPICAL PERFORMANCE CHARACTERISTICS = +27°C AMB 100 Vi=3.6V 70 Vi=3.9V Vi=4.2V 65 Vi=5.0V 60 100.0 1000.0 0.1 Figure 2. Efficiency vs Load ...

Page 5

... Vin (V) Figure =3.3V OFF IN OUT 700.0 600.0 500.0 400.0 300.0 200.0 100.0 0.0 3.5 4.0 4.5 Vin (V) Figure 11. Ripple Frequency vs =3.3V OUT Date: 5/25/04 SP6651A High Efficiency 800mA Synchronous Buck Regulator = +27°C AMB 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 5.1 5.4 3.0 Figure 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 5.1 5.4 3.0 Figure 10. K OFF 700.0 600.0 500.0 400.0 300.0 200.0 Vout = 3 ...

Page 6

... TYPICAL PERFORMANCE CHARACTERISTICS: Continued Refer to the typical application schematic, T Figure 13. V Start up, I =0.6A OUT OUT Figure 15. Load Step, I =0.4A to 0.8A, V OUT Figure 17. Start up from SHDN, I =0.6A, V OUT Date: 5/25/04 SP6651A High Efficiency 800mA Synchronous Buck Regulator = +27°C AMB CH.1=V IN 2.5V/div CH.2=V OUT 2.0V/div CH.4=I IN 0.5A/div Figure 14. V =3. ...

Page 7

... The SP6651A operates with a light load quies- cent current of 20µA using a 0.3Ω PMOS main switch and a 0.3Ω NMOS synchronous switch. It operates with excellent efficiency across the ...

Page 8

... OUT where ESR of the output capacitor ESR the output ripple of the SP6651A regulator is independent of the input and output voltages. For battery powered applications, where the battery voltage changes significantly, the SP6651A provides constant output voltage ripple through-out the battery lifetime. This greatly simplifies the LC filter design ...

Page 9

... The converter’s transient response is quick since there is no compensated error amplifier in the loop. Inductor Over-Current Protection To reduce the light load dropout Iq, the SP6651A over-current system is only enabled when I 400mA. The inductor over-current protection circuitry is programmed to limit the peak induc- tor current to 1 ...

Page 10

... BLON is forced Low when in UVLO. External Feedback Pin The FB pin 6 is compared to an internal refer- ence voltage of 0.8V to regulate the SP6651A output. The output voltage can be externally programmed within the range +1.0V to +5.0V by tying a resistor from FB to ground and (pin7) ...

Page 11

... The typical perfor- mance characteristics curves show very good load step transient response for the SP6651A with the recommended output capacitance of 22µF ce- ramic. The input capacitor will reduce the peak current ...

Page 12

... SANYO 6APA22M 47 TDK C3225X5R0J46M 47 SANYO 6TPA47M Note: Components highlighted in bold are those used on the SP6651A Evaluation Board. Table 2 Component Selection Output Voltage Program The output voltage is programmed by the external divider, as shown in the typical application circuit on page 1. First pick a value for R than 300K. Too large a value of R ...

Page 13

... Figure 21. SP6651A PCB Bottom Sample Layout Date: 5/25/04 SP6651A High Efficiency 800mA Synchronous Buck Regulator APPLICATION INFORMATION: Continued SP6651A pin 9 GND is connected to pin 10 PGND. Power loops on the input and output of the con- verter should be laid out with the shortest and widest traces possible. The longer and narrower the trace, the higher the resistance and inductance it will have ...

Page 14

... D 3.00 BSC E 4.90 BSC E1 3.00 BSC 0.50 BSC e e1 2.00 BSC L 0.4 0.60 L1 0.95 REF 0.25 BSC 0.07 R1 0.07 Ø 0º Ø1 5º 1 Date: 5/25/04 SP6651A High Efficiency 800mA Synchronous Buck Regulator E1 Seating Plane - 1.10 - 0.15 0.95 - 0.27 - 0.23 WITH PLATING 0.80 BASE METAL 8º - 15º 14 PACKAGE: 10 PIN MSOP Ø Ø ...

Page 15

... SYMBOL MIN NOM MAX A 0.80 0.90 A1 0.02 0. 0.20 REF 0.18 0.25 0. 3.00 BSC D2 2.20 e 0.50 PITCH E 3.00 BSC E2 1. 0.30 0.40 0.50 Date: 5/25/04 SP6651A High Efficiency 800mA Synchronous Buck Regulator E 1. PACKAGE: 10 PIN DFN Bottom View Side View 10 PIN DFN © Copyright 2004 Sipex Corporation E2 A3 ...

Page 16

... Part Number Top Mark SP6651AEU..............6651AEU....................... -40°C to +85°C ................................................... 10 Pin MSOP SP6651AEU/TR........6651AEU ............ ........... -40°C to +85°C .................................................. 10 Pin MSOP SP6651AER.............6651AER......................... -40°C to +85°C ..................................................... 10 Pin DFN SP6651AER/TR.......6651AER......................... -40°C to +85°C ..................................................... 10 Pin DFN Available in lead free packaging. To order add "-L" suffix to part number. ...

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