SP6641BEK-L-5-0-TR Datasheet, PDF (1/14 Pages) Exar Corporation – 500mA Alkaline DC/DC Boost Regulator in SOT-23

®
SP6641A/6641B
500mA Alkaline DC/DC Boost Regulator in SOT-23
■ Ultra Low Quiescent Current: 10µA
■ Wide Input Voltage Range: 0.9V to 4.5V
■ 90mA I_OUT at 1.3V Input (SP6641A-3.3V)
■ 500mA I_OUT at 2.6V Input (SP6641B-3.3V)
■ 100mA I_OUT at 2.0V Input (SP6641A-5.0V)
■ 500mA I_OUT at 3.3V Input (SP6641B-5.0V)
■ Fixed 3.3V or 5.0V Output Voltage
■ Up to 87% Efficiency
■ 0.3Ω NFET R_DSon
■ Startup Voltage Guaranteed at 0.9V
■ 0.33A Inductor Current Limit (SP6641A)
■ 1A Inductor Current Limit (SP6641B)
■ Logic Shutdown Control
■ SOT-23-5 Package
LX 1
GND 2
V_OUT 3
SP6641
5 Pin SOT-23
5 ^VBATT
4 ^SHDN
APPLICATIONS
■ PDA's
■ DSC's
■ CD/MP3 Players
■ Pagers
■ Digital Cameras
■ Portable Handheld Medical Devices
Now Available in Lead Free Packaging
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
V_IN (V)
Figure 2. Maximum Load Current in Operation
Rev. 5/26/05, *Patent Pending
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23
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© Copyright 2002 Sipex Corporation