SP6641AKEB-5-0 Exar Corporation, SP6641AKEB-5-0 Datasheet

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SP6641AKEB-5-0

Manufacturer Part Number
SP6641AKEB-5-0
Description
500mA Alkaline DC/DC Boost Regulator
Manufacturer
Exar Corporation
Datasheet

Specifications of SP6641AKEB-5-0

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Figure 1. Typical Application Schematic
Rev. 5/26/05, *Patent Pending
DESCRIPTION
The SP6641 is an ultra-low quiescent current, high efficiency, DC-DC boost converter designed
for single and dual cell alkaline, or Li-ion battery applications found in PDA’s, MP3 players, and
other handheld portable devices. The SP6641 features a 10µA quiescent current, a 0.3Ω N-
channel charging switch, 0.9V input startup, and a 0.33A or 1.0A inductor current limiting feature.
The SP6641 is offered in a 5 pin SOT-23 package and provides an extremely small power supply
footprint optimized for portable applications. The SP6641 is preset to 3.3V and can be controlled
by a 1nA active LOW shutdown pin.
SP6641A 3.3V & 5V: C1 = C2 = 22µF Ceramic, L1 = 22µH CDRH5D28,
SP6641B 3.3V & 5V: C1 = C2 = 100µF POSCAP, L1 = 10µH CDRH5D28,
0.3Ω NFET R
SOT-23-5 Package
Ultra Low Quiescent Current: 10µA
Wide Input Voltage Range: 0.9V to 4.5V
90mA I
500mA I
100mA I
500mA I
Fixed 3.3V or 5.0V Output Voltage
Up to 87% Efficiency
Startup Voltage Guaranteed at 0.9V
0.33A Inductor Current Limit (SP6641A)
1A Inductor Current Limit (SP6641B)
Logic Shutdown Control
500mA Alkaline DC/DC Boost Regulator in SOT-23
D1
C2
R1
OUT
OUT
OUT
OUT
D1 = MBR0520, C3 = Open, R1 = Shorted.
D1 = ZHCS2000, C3 = 1µF Ceramic, R1 = 10Ω.
at 1.3V Input (SP6641A-3.3V)
at 2.6V Input (SP6641B-3.3V)
at 2.0V Input (SP6641A-5.0V)
at 3.3V Input (SP6641B-5.0V)
1
2
3
C3
DS
LX
GND
V
OUT
on
®
SP6641A
L1
U1
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23
SHDN
V
®
®
BATT
5
4
C1
SHDN
0.9V to 4.5V
V
+3.3V or 5V
OUT
V
BATT
1
APPLICATIONS
Now Available in Lead Free Packaging
Figure 2. Maximum Load Current in Operation
700
650
600
550
500
450
400
350
300
250
200
150
100
PDA's
DSC's
CD/MP3 Players
Pagers
Digital Cameras
Portable Handheld Medical Devices
50
0
1.0
GND
V
OUT
LX
1.5
SP6641A/6641B
1
2
3
2.0
5 Pin SOT-23
SP6641
2.5
V
© Copyright 2002 Sipex Corporation
IN
(V)
3.0
SP6641B, 1.0A, 3.3V
SP6641B, 1.0A, 5V
SP6641A, 0.33A, 3.3V
SP6641A, 0.33A, 5V
3.5
5
4
V
SHDN
4.0
BATT
4.5

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SP6641AKEB-5-0 Summary of contents

Page 1

Alkaline DC/DC Boost Regulator in SOT-23 Ultra Low Quiescent Current: 10µA Wide Input Voltage Range: 0.9V to 4.5V 90mA I at 1.3V Input (SP6641A-3.3V) OUT 500mA I at 2.6V Input (SP6641B-3.3V) OUT 100mA I at 2.0V Input (SP6641A-5.0V) ...

Page 2

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 sections of the specifications below is not implied. Exposure to absolute maximum rating conditions ...

Page 3

PIN DESCRIPTION PIN NO. PIN NAME GND 3 V OUT 4 SHDN 5 V BATT BLOCK DIAGRAM V BATT V BATT Internal V BATT V OUT V BATT SHDN Min. SHDN T OFF V OUT REFREADY Ref ...

Page 4

PERFORMANCE CHARACTERISTICS Refer to the circuit in Figure +25°C AMB 100 ...

Page 5

PERFORMANCE CHARACTERISTICS Refer to the circuit in Figure +25°C AMB 5.200 Vi=4.2V 5.180 Vi=3.6V 5.160 Vi=3.3V Vi=2.0V 5.140 Vi=1.3V 5.120 5.100 5.080 5.060 5.040 5.020 5.000 0 50 100 150 Iload (mA) Figure 9. SP6641AEK-5.0 Line/Load Rejection ...

Page 6

OPERATION General Overview The SP6641 is a high efficiency, low quiescent current step-up DC-DC converter ideal for single and dual cell alkaline and single cell Lithium Ion battery applications such as medical monitors, PDA’s, MP3 players, and other portable end ...

Page 7

OPERATION Loop Regulation: continued The SP6641 feed forward off-time control de- livers more load current than constant off-time control because the input battery voltage drops during its life cycle. The term (I the average current delivered to the output ca- ...

Page 8

APPLICATION INFORMATION Circuit Layout Printed circuit board layout is a critical part of a power supply design. Poor designs can result in excessive EMI on the voltage gradients and feedback paths on the ground planes with appli- cations involving high ...

Page 9

APPLICATION INFORMATION: continued Maximum Startup Current It should be noted that for low input voltages the SP6641 startup circuit can not support large load currents at startup. In startup the SP6641 needs to boost the output from zero volts using ...

Page 10

APPLICATION INFORMATION: continued +0.9V to +3.3V Input V BATT L1 22µ SP6641 2 D1 GND 3 SHDN V OUT + C2 22µF Figure 15. SP6641A 3.3V Evaluation Board with SP6201 LDO Regulator SuperCap Application on the SP6641 ...

Page 11

APPLICATION INFORMATION: continued Low Battery Circuit for SP6641 Application The circuit in figure 17 uses the Sipex SPX432 shunt regulator as a reference and comparator circuit to detect a low battery condition and give a high level, typically 1.7V output. ...

Page 12

Rev. 5/26/05, *Patent Pending SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 PACKAGE: 5 Lead SOT23 .10 SYMBOL MIN MAX ...

Page 13

Part Number TOP MARK SP6641AEK-3.3/TR ............. K1 ...................... -40°C to 85°C ........ (Tape & Reel) 5-Pin SOT-23 SP6641BEK-3.3/TR ............. L1 ...................... -40°C to 85°C ........ (Tape & Reel) 5-Pin SOT-23 SP6641AEK-5.0/TR ............. P1 ...................... -40°C to 85°C ........ (Tape & ...

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