SP6641AEK-5-0/TR Exar Corporation, SP6641AEK-5-0/TR Datasheet - Page 3

• Manufacturer Part Number: SP6641AEK-5-0/TR
• Description: 500mA Alkaline DC/DC Boost Regulator
• Manufacturer: Exar Corporation

Specifications of SP6641AEK-5-0/TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIN DESCRIPTION
BLOCK DIAGRAM
Rev. 5/26/05, *Patent Pending
SHDN
PIN NO.
V
OUT
1
2
3
4
5
SHDN
Internal
V
BATT
V
V
Block
Ref
BATT
OUT
SHDN
PIN NAME
SHDN
V
SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23
V
GND
V
V
BATT
LX
REFREADY
BATT
OUT
OUT
Internal
Supply
V
T
BATT
Min.
REF
OFF
FB
+
-
C
T
OFF
DESCRIPTION
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.
Ground pin. The internal regulator bias currents and the inductor
charging current flows out of this pin.
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.
Shutdown. Tie this pin to V
ground to disable all circuitry inside the chip. In shutdown mode, the
output voltage will float at a diode drop below the battery potential.
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
V
OUT(LOW)
S
OFF
R
≥ K
V
BATT
EN
3
OFF
Q
Qn
OSC
CHARGE
SU
/ (V
DRIVER
OUT
SUGATE
– V
NGATE
BATT
IN
).
for normal operation. Tie this pin the
SP6641
M
LX
LX
V
OUT
V
OUT
© Copyright 2002 Sipex Corporation
1
ITH
I
PK
Internal
Ground
/M
+
-
C
ICHN
V
OUT
GND
LOAD