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PDF SP6641A Data sheet ( Hoja de datos )
| Número de pieza | SP6641A | |
| Descripción | 500mA Alkaline DC/DC Boost Regulator in SOT-23 | |
| Fabricantes | Sipex | |
| Logotipo |  |
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® SP6641A/6641B
500mA Alkaline DC/DC Boost Regulator in SOT-23
s Ultra Low Quiescent Current: 10µA
s Wide Input Voltage Range: 0.9V to 4.5V
s 90mA IOUT at 1.3V Input (SP6641A-3.3V)
s 500mA IOUT at 2.6V Input (SP6641B-3.3V)
s 100mA IOUT at 2.0V Input (SP6641A-5.0V)
s 500mA IOUT at 3.3V Input (SP6641B-5.0V)
s Fixed 3.3V or 5.0V Output Voltage
s Up to 87% Efficiency
s 0.3Ω NFET RDSon
s Startup Voltage Guaranteed at 0.9V
s 0.33A Inductor Current Limit (SP6641A)
s 1A Inductor Current Limit (SP6641B)
s Logic Shutdown Control
s SOT-23-5 Package
LX 1
GND 2
VOUT 3
SP6641
5 Pin SOT-23
5 VBATT
4 SHDN
APPLICATIONS
s PDA's
s DSC's
s CD/MP3 Players
s Pagers
s Digital Cameras
s Portable Handheld Medical Devices
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.
D1
R1
C2
L1
1 LX
VBATT 5
®
2 GND U1
SP6641A
3 VOUT
4
SHDN
0.9V to 4.5V
VBATT
C1
SHDN
C3
VOUT
+3.3V or 5V
SP6641A 3.3V & 5V: C1 = C2 = 22µF Ceramic, L1 = 22µH CDRH5D28,
D1 = MBR0520, C3 = Open, R1 = Shorted.
SP6641B 3.3V & 5V: C1 = C2 = 100µF POSCAP, L1 = 10µH CDRH5D28,
D1 = ZHCS2000, C3 = 1µF Ceramic, R1 = 10Ω.
Figure 1. Typical Application Schematic
700
650
600
550
500
450
400 SP6641B, 1.0A, 3.3V
350 SP6641B, 1.0A, 5V
300 SP6641A, 0.33A, 3.3V
250 SP6641A, 0.33A, 5V
200
150
100
50
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VIN (V)
Figure 2. Maximum Load Current in Operation
Rev. 3/5/02, *Patent Pending
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23
1
© Copyright 2002 Sipex Corporation
1 page  
PERFORMANCE CHARACTERISTICS
Refer to the circuit in Figure 1, TAMB = +25°C
5.200
5.180
5.160
5.140
5.120
5.100
5.080
5.060
5.040
5.020
5.000
0
Vi=4.2V
Vi=3.6V
Vi=3.3V
Vi=2.0V
Vi=1.3V
50 100 150 200 250
Iload (mA)
Figure 9. SP6641AEK-5.0 Line/Load Rejection Vs Load
Current
5.100
5.080
5.060
5.040
5.020
5.000
4.980
4.960
4.940
4.920
4.900
0
Vi=4.2V
Vi=3.6V
Vi=3.3V
Vi=2.0V
Vi=1.3V
200 400 600
Iload (mA)
800
Figure 10. SP6641BEK-5.0 Line/Load Rejection Vs
Load Current
250
200 SP6641AEK-5.0
SP6641AEK-3.3
150
100
50
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Vin (V)
Figure 11. SP6641AEK-3.3 & SP6641AEK-5.0 No Load
Battery Current
500
450
400 SP6641B-5.0
350 SP6641B-3.3
300
250
200
150
100
50
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Vin (V)
Figure 12. SP6641BEK-3.3 & SP6641AEK-5.0 No Load
Battery Current
250
200
150
100
SP6641AEK-3.3, 22µH
SP6641AEK-3.3, 10µH
50 SP6641AEK-5.0, 22µH
SP6641AEK-5.0, 10µH
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Vin (V)
Figure 13. SP6641AEK-3.3 & SP6641AEK-5.0
Maximum Resistive Load Current in Startup
700
600
500
400
300
200 SP6641BEK-3.3, 22µH
SP6641BEK-3.3, 10µH
SP6641BEK-5.0, 22µH
100 SP6641BEK-5.0, 10µH
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Vin (V)
Figure 14. SP6641BEK-3.3 & SP6641BEK-5.0
Maximum Resistive Load Current in Startup
Rev. 3/5/02, *Patent Pending
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23
5
© Copyright 2002 Sipex Corporation
5 Page 
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. When the
battery is good, the SPX432 output is low, but
not at ground but at 0.8V or about one Vbe
below the 1.24V reference. To translate that
level to a CMOS Low of less than 0.4V, an NPN
and 2 signal diodes can be added to the SPX432
output, as shown. The small SOT23-3pin
SPX432 and 2N3904 bipolar transistor and di-
odes are small and inexpensive to add to the
SP6641 circuit and work well to add a Battery
Low detection circuit, with the addition of about
130µA current from 3.3V out. As a bonus, the
output of this circuit can be used to drive the
SP6641 SHDN_N pin 3 to GND when the bat-
tery is removed, which would reset the SP6641
and eliminate the need for the SuperCap Switch
shown in figure 16.
VBATT
C1
22µF
Diode
Schottky
C2
22µF
L1
22µH
®
1
LX
VBATT 5
U1
2 SP6641
GND
3
VOUT
SHDN 4
SHDN
J1
1
2
3
VOUT
+3.3V
2.7V, 0.9Ω PMOS
SOT23-3 IRLML6302
3 Q1 2
3.3V to
Nonvolatile Function
R1
1M
1
C3
.22F Supercap
3
1 Q2 SOT23-3 IRLML2402
2.7V NMOS
2
Figure 16. SP6641A 3.3V with SuperCap Switch
VBATT
C1
22µF
L1
22µH
D1
Diode
Schottky
C2
22µF
1 LX
VBATT 5
®
2
GND
U1
SP6641
3 VOUT
SHDN 4
1.8V THRES. VTHRES = 1.24V(1 + R1/R2)
R1
44k
R2
100k
U2
1
SPX432M
REF
A3
2 K SOT23-3
BATT GOOD
R4 D2
D3
100k 1N4148 1N4148
R3
20k
2V = BATT GOOD
Q2 0V = LOW BATT
2N3904
R5
100k
VOUT 3.3V
Figure 17. SP6641A 3.3V with Low Battery Detection
Rev. 3/5/02, *Patent Pending
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23
11
© Copyright 2002 Sipex Corporation
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SP6641A.PDF ] | |
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