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SP6641AEK-L-5-0/TR

P1-P3P4-P6P7-P9P10-P12P13-P13
1
Rev. 5/26/05,
*Patent Pending
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 © Copyright 2002 Sipex Corporation
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.
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
DS
on
■ Startup Voltage Guaranteed at 0.9V
■ 0.33A Inductor Current Limit (SP6641A)
■ 1A Inductor Current Limit (SP6641B)
■ Logic Shutdown Control
■ SOT-23-5 Package
V
OUT
GND
SHDN
V
BATT
LX
SP6641
5 Pin SOT-23
1
2
3
5
4
APPLICATIONS
■ PDA's
■ DSC's
■ CD/MP3 Players
■ Pagers
■ Digital Cameras
■ Portable Handheld Medical Devices
SP6641A/6641B
Figure 1. Typical Application Schematic
Figure 2. Maximum Load Current in Operation
I
OUT
(mA)
0
50
100
150
200
250
300
350
400
450
500
550
600
650
700
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V
IN
(V)
SP6641B, 1.0A, 3.3V
SP6641B, 1.0A, 5V
SP6641A, 0.33A, 3.3V
SP6641A, 0.33A, 5V
GND
LX
V
BATT
SHDN
L1
0.9V to 4.5V
U1
SP6641A
V
OUT
SHDN
V
BATT
®
®
C2
V
OUT
+3.3V or 5V
D1
1
2
3
C1
5
4
C3
R1
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.
Now Available in Lead Free Packaging
2
Rev. 5/26/05,
*Patent Pending
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 © Copyright 2002 Sipex Corporation
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 for extended
periods of time may affect reliability.
ELECTRICAL SPECIFICATIONS
V
BATT
= V
SHDN
= 1.3V, I
LOAD
= 0mA, -40°C <T
A
< +85°C, V
OUT
= +3.3V or +5.0V preset, typical values at 27°C
unless otherwise noted.
LX, V
OUT
, SHDN, V
BATT
to GND pin ....... -0.3 to 6.0V
LX Current.......................................................... 1.5A
Reverse V
BATT
Current ................................... 220mA
Storage Temperature ........................ -65°C to 150°C
Operating Temperature..................... -40°C to +85°C
Lead Temperature (Soldering, 10 sec) .......... 300 °C
PARAMETER MIN TYP MAX UNITS CONDITIONS
Input Voltage Operating Range, 0.5 4.5 V after startup
V
BATT
Startup Voltage, V
BATT
0.85 0.90 V R
LOAD
=3kΩ, T
A
=27°C
1.00 V R
LOAD
=3kΩ,-40°C <T
A
< +85°C
Output Voltage, V
OUT
3.16 3.30 3.44 V 3.3V V
OUT
preset
4.80 5.00 5.20 V 5.0V V
OUT
preset
Quiescent Current into V
OUT
,1015µAV
OUT
=3.5V, 3.3V V
OUT
preset
I
Q(OUT)
V
OUT
=5.5V, 5.0V V
OUT
preset
Quiescent Current into V
BATT
, 250 500 nA V
OUT
=3.5V, 3.3V V
OUT
preset
I
QB
V
OUT
=5.5V, 5.0V V
OUT
preset
Shutdown Current into V
OUT
,1500 nA V
SHDN
=0V
I
SHDN
Shutdown Current into V
BATT
,20100 nA V
SHDN
=0V
I
SHDN
Inductor Current Limit 280 330 380 mA
(SP6641A)
Inductor Current Limit 850 1000 1150 mA
(SP6641B)
Output Current (SP6641AEK-3.3) 90 mA V
BATT
=1.3V
190 mA V
BATT
=2.6V
Output Current (SP6641BEK-3.3) 200 mA V
BATT
=1.3V
500 mA V
BATT
=2.6V
Output Current (SP6641AEK-5.0) 100 mA V
BATT
=2.0V
175 mA V
BATT
=3.3V
Output Current (SP6641BEK-5.0) 275 mA V
BATT
=2.0V
500 mA V
BATT
=3.3V
Minimum Off-Time Constant 1.50 V*µsT
OFF
≥ K
OFF
/ (V
OUT
– V
IN
)
K
OFF
NMOS Switch Resistance 0.3 0.75 Ω Inmos=100mA
SHDN Input Voltage Vil 20 % % of V
BATT
Vih 80 % % of V
BATT
SHDN Input Current 1 100 nA
3
Rev. 5/26/05,
*Patent Pending
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 © Copyright 2002 Sipex Corporation
PIN DESCRIPTION
PIN NO. PIN NAME DESCRIPTION
1LXInductor switching node. Connect one terminal of the inductor to the
positive terminal of the battery. Connect the second terminal of the
inductor to this pin. The inductor charging current flows into LX,
through the internal charging N-channel FET, and out through the GND
pin.
2 GND Ground pin. The internal regulator bias currents and the inductor
charging current flows out of this pin.
3V
OUT
Output voltage sense pin, internal regulator voltage supply, and
minimum off-time one shot input. Kelvin connect this pin to the positive
terminal of the output capacitor, but for SP6641B, use 10Ω series
resistor and 1µF bypass per Figure 1 schematic.
4 SHDN Shutdown. Tie this pin to V
BATT
for normal operation. Tie this pin the
ground to disable all circuitry inside the chip. In shutdown mode, the
output voltage will float at a diode drop below the battery potential.
5V
BATT
Battery voltage pin. The startup circuitry runs off of this pin. The
regulating circuitry also uses this voltage to control the minimum off-
time. T
OFF
≥ K
OFF
/ (V
OUT
– V
IN
).
BLOCK DIAGRAM
Internal
V
BATT
V
BATT
Internal
Supply
SHDN
V
OUT
Ref
Block
REFREADY
REF
GND
Internal
Ground
I
PK
/M
V
OUT(LOW)
LX
+
-
C
SU
OSC
EN
Min.
T
OFF
+
-
C
FB
SHDN
V
BATT
V
OUT
V
OUT
SHDN
V
OUT
NGATE
DRIVER
CHARGE
R
Q
S
Qn
T
OFF
SUGATE
V
BATT
V
OUT
LX
M
1
ICHN
SP6641
LOAD
V
BATT
V
OUT
ITH
P1-P3P4-P6P7-P9P10-P12P13-P13

SP6641AEK-L-5-0/TR

Mfr. #:
Buy SP6641AEK-L-5-0/TR
Manufacturer:
MaxLinear
Description:
Switching Voltage Regulators 100mA Alkaline DC/DC
Lifecycle:
New from this manufacturer.
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