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SP6641BEK-L-5-0 Datasheet(PDF) 3 Page - Sipex Corporation

Part # SP6641BEK-L-5-0
Description  500mA Alkaline DC/DC Boost Regulator in SOT-23
Download  13 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP6641BEK-L-5-0 Datasheet(HTML) 3 Page - Sipex Corporation

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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
1LX
Inductor 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.
3VOUT
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 VBATT 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.
5VBATT
Battery voltage pin. The startup circuitry runs off of this pin. The
regulating circuitry also uses this voltage to control the minimum off-
time. TOFF ≥ KOFF / (VOUT – VIN).
BLOCK DIAGRAM
Internal
VBATT
VBATT
Internal
Supply
SHDN
VOUT
Ref
Block
REFREADY
REF
GND
Internal
Ground
IPK/M
VOUT(LOW)
LX
+
-
C
SU
OSC
EN
Min.
TOFF
+
-
C
FB
SHDN
VBATT
VOUT
VOUT
SHDN
VOUT
NGATE
DRIVER
CHARGE
R
Q
S
Qn
TOFF
SUGATE
VBATT
VOUT
LX
M
1
ICHN
SP6641
LOAD
VBATT
VOUT
ITH


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