®
SP6644/6645
Single/Dual Alkaline Cell, High Efficiency
Boost DC-DC Regulator
■
90mA Output Current at 1.3V Input
■
190mA Output Current at 2.6V Input
■
+2V to +5.5V Output Range
■
0.88V Guaranteed Start-Up
■
92% High Efficiency
■
1.6µA Quiescent Supply Current at V
BATT
■
Reverse Battery Protection
■
Internal Synchronous Rectifier
■
5nA Logic Controlled Shutdown Current
From V
BATT
■
Low-Battery Detection Active LOW Output
V B AT 1
B AT T L 0 2
RLIM 3
SHDN 4
SP6644
SP6645
8 Pin MSOP
8
V
OUT
7
LX
6
GND
4
FB
Now Available in Lead Free Packaging
■
Small 8 Pin MSOP Package
■
No External FETs
■
Flexibility to Optimize Inductor Type
with Programmable Peak Current
Control
DESCRIPTION
The SP6644/6645 devices are high-efficiency, low-power step-up DC-DC converters ideal
for single or dual alkaline cell applications such as pagers, remote controls, pointing devices,
medical monitors, and other low-power portable end products. Designers can control the
SP6644 device with an active LOW shutdown input. The SP6644 device features an active
low output for batteries below +1.0V. The SP6645 device features an active low output for
batteries below +2.0V. Both devices contain a 0.8Ω synchronous rectifier, a 0.5Ω
N-channel MOSFET power switch, an internal voltage reference, circuitry for pulse-
frequency-modulation, and an under voltage comparator. The output voltage for the
SP6644/6645 devices is preset to +3.3V + 4% or can be adjusted from +2V to +5.5V by
manipulating two external resistors
TYPICAL APPLICATION CIRCUIT
22µH
0.7A
0.88V to
3.3V Input
47µF
R
LIM
V
BATT
LX
V
OUT
+3.3V
OUT
SP6644
SP6645
47µF
BATTLO
SHDN
GND
FB
Date: 11/30/04
SP6644/6645 High Efficiency Boost Regulator
© Copyright 2004 Sipex Corporation
1
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.
V
BATT
to GND.............................................-0.3 to 6.0V
V
OUT
to GND..............................................-0.3 to 6.0V
LX, SHDN, FB, BATTLO, to GND.............-0.3 to 6.0V
Reverse battery Current, T
AMB
=+25˚C.............220mA
(NOTE 1)
V
BATT
forward current............................................0.5A
V
OUT
, LX current......................................................1A
Storage Temperature Range............-65˚C to +165˚C
Lead Temperature (soldering 10s)..................+300˚C
Operating Temperature.......................-40˚C to +85˚C
Power Dissipation Per Package
8-pin
µSOIC
(derate 4.85mW/
O
C above +70
O
C)
..........390mW
ELECTRICAL CHARACTERISTICS
V
BATT
= V
SHDN
= 1.3V, I
LOAD
= 0mA, FB = GND, T
AMB
= -40
o
C to +85
o
C, and typical values are at T
AMB
= +25
o
C unless otherwise noted.
PARAMETER
Maximum Operating Input Voltage,
V
BATT(MAX)
Start-Up Input Voltage, V
BATT
Start-Up Input Voltage, V
BATT
Temperature Coefficient
SHDN Input Voltage
V
IL
V
IH
SHDN Input Current
FB Input Current
FB Set Voltage, V
FB
BATTLO Falling Trip Voltage
Output Voltage, V
OUT
Output Voltage Range
N-Channel On-Resistance
P-Channel On-Resistance
MIN.
TYP.
MAX.
3.3
UNITS
V
V
mVºC
♦
♦
♦
R
L
= 3k
Ω,
CONDITIONS
0.82
-1
1.1
15
80
1
1
1.215
0.94
1.88
3.16
2.0
0.5
0.8
1.262
1.00
2.00
3.30
10 0
100
1.309
1.06
2.12
3.44
5.5
1.0
1.6
%
nA
nA
V
V
V
V
Ω
Ω
♦
♦
♦
♦
♦
♦
% of V
BATT
% of V
BATT
V
FB
=1.3V,
external feedback
SP6644, V
OUT
= 3.3V
SP6645, V
OUT
= 3.3V
V
FB
<0.1V
external feedback
V
OUT
= 3.3V
V
OUT
= 3.3V
Date: 11/30/04
SP6644/6645 High Efficiency Boost Regulator
© Copyright 2004 Sipex Corporation
2
ELECTRICAL CHARACTERISTICS
V
BATT
= V
SHDN
= 1.3V, I
LOAD
= 0mA, FB = GND, T
AMB
= -40
o
C to +85
o
C, and typical values are at T
AMB
= +25
o
C unless otherwise noted.
PARAMETER
Quiescent Current into V
OUT
, I
QOUT
Quiescent Current into V
BATT
, I
QBATT
Shutdown Current into V
OUT
, I
SHDNOUT
Shutdown Current into V
BATT
, I
SHDNBATT
Low Output Voltage for BATTLO, V
OL
Leakage Current for BATTLO
Efficiency
Inductor Peak Current, I
PEAK
Under Voltage Lock-out (UVLO)
MIN.
TYP.
50
1.6
0.001
0.005
MAX.
80
3.0
0.5
0.1
0.4
1
UNITS
µA
µA
µA
µA
V
µA
%
♦
♦
♦
♦
♦
♦
♦
♦
♦
CONDITIONS
V
OUT
= 3.5V
V
BATT
= 1.0V
V
OUT
= 3.5V, V
SHDN
- 0V
V
BATT
= 1.0V, V
SHDN
- 0V
V
BATT
= 0.9V,V
OUT
= +3.3V,I
SINK
=1mA
V
BATT
= 2.6V,V
BATTLO
= 3.5V
I
LOAD
= 150mA,V
BATT
= 2.6V
R
LIM
= 5k
Ω
, NOTE 3
89
275
0.500
350
0.720
400
mA
V
NOTE 1:
The reverse battery current is measured from the Typical Operating Circuit's input terminal to GND
when the battery is connected backward. A reverse current of 220mA will not exceed package dissipation limits
but, if left for an extended time (more than 10 minutes), may degrade performance.
NOTE 2:
Specifications to -40
o
C are guaranteed by design, not production tested.
NOTE 3:
Inductor Peak Current where .
I
PEAK
=
1400
R
LIM
Date: 11/30/04
SP6644/6645 High Efficiency Boost Regulator
© Copyright 2004 Sipex Corporation
3
PERFORMANCE CHARACTERISTICS
Refer to the circuit in
Figure 28,
T
AMB
= +25
o
C unless otherwise noted.
100
90
100
90
Efficiency (%)
Efficiency (%)
80
70
60
50
40
0.1
1.0
10.0
Iload (mA)
100.0
1000.0
Vb=1.0V
Vb=1.3V
Vb=2.0V
Vb=2.6V
Vb=3.2V
80
70
60
50
40
0.1
1.0
10.0
Iload (mA)
100.0
1000.0
Vb=1.0V
Vb=1.3V
Vb=2.0V
Vb=2.6V
Vb=3.2V
Figure 1. Efficiency vs. Output Current (Vout=3.3V),
Rlim=2.5k, Li=22uH Sumida CD43
Figure 2. Efficiency vs. Output Current (V
OUT
=3.3V),
Rlim=5k, Li=22µH Sumida CD43
100
90
Efficiency (%)
100
90
Efficiency (%)
80
70
60
50
40
0.1
1.0
10.0
Iload (mA)
100.0
1000.0
Vb=1.0V
Vb=1.3V
Vb=2.0V
Vb=2.6V
Vb=3.2V
80
70
60
50
40
0.1
1.0
10.0
Iload (mA)
100.0
1000.0
Vb=1.0V
Vb=1.3V
Vb=2.0V
Vb=2.6V
Vb=3.2V
Figure 3. Efficiency vs. Output Current (Vout=3.3V),
Rlim=2.5k, Li=22uH Sumida CDRH5D18 Low Profile
Figure 4. Efficiency vs. Output Current (Vout=3.3V),
Rlim=5k, Li=100µH Sumida CD54
100
90
Efficiency (%)
100
90
Efficiency (%)
80
70
60
50
40
0.1
1.0
10.0
Iload (mA)
100.0
1000.0
Vb=1.0V
Vb=1.3V
Vb=2.0V
Vb=2.6V
Vb=3.2V
80
70
60
50
40
0.1
1.0
10.0
Iload (mA)
100.0
1000.0
Vb=1.0V
Vb=1.3V
Vb=2.0V
Vb=2.6V
Vb=3.2V
Figure 5. Efficiency vs. Output Current (Vout=5V),
Rlim=2.5k, Li=22uH Sumida CD43, Refer to Figure 29,
R1=499k, R2=169k
Figure 6. Efficiency vs. Output Current (Vout=5V),
Rlim=5k, Li=22uH Sumida CD43, Refer to Figure 29,
R1=499k, R2=169k
3.33
3.32
3.31
V
OUT
(V)
3.33
3.32
V
OUT
(V)
Vb=1.3V
Vb=2.6V
3.31
3.30
3.29
3.28
3.27
3.30
3.29
3.28
3.27
0
20 40
60 80 100 120 140 160 180 200
Iload (mA)
Vb=1.3V
Vb=2.6V
0
10
20 30 40 50 60 70 80
Iload (mA)
90 100
Figure 7. Line/Load Rejection vs. Output Current
(Vout=3.3V), Rlim=2.5k, Li=22uH Sumida CD43
Figure 8. Line/Load Rejection vs. Output Current
(Vout=3.3V), Rlim=5k, Li=22uH Sumida CD43
Date: 11/30/04
SP6644/6645 High Efficiency Boost Regulator
© Copyright 2004 Sipex Corporation
4
PERFORMANCE CHARACTERISTICS
Refer to the circuit in
Figure 28,
T
AMB
= +25
o
C unless otherwise noted.
5.08
5.07
5.06
5.05
V
OUT
(V)
5.08
5.07
5.06
V
OUT
(V)
5.05
5.04
5.03
5.02
5.01
5.00
0
10
20
30
40
50
Iload (mA)
5.04
5.03
5.02
5.01
5.00
0
10 20
30
40
50
60
70
80 90 100
Vb=1.3V
Vb=2.6V
Vb=1.3V
Vb=2.6V
Iload (mA)
Figure 9. Line/Load vs. Output Current (Vout=5V),
Rlim=2.5k, Li=22uH Sumida CD43, Refer to figure 29,
R1=499k, R2=169k
240
220
200
180
160
140
120
100
80
60
40
20
0
0.0
Figure 10. Line/Load vs. Output Current (Vout=5V),
Rlim=5k, Li=22uH Sumida CD43, Refer to figure 29,
R1=499k, R2=169k
240
220
200
180
160
140
120
100
80
60
40
20
0
0.0
Max I
O
(mA)
Max I
O
(mA)
Rlim=2.5K
Rlim=5K
Rlim=2.5K
Rlim=5K
1.0
2.0
Vbatt (V)
3.0
4.0
1.0
2.0
Vbatt (V)
3.0
4.0
Figure 11. Maximum Load Current vs. Vbatt
(Vout=3.3V), Li=22uH Sumida CD43
Figure 12. Maximum Load Current vs. Vbatt (Vout=5V),
Li=22uH Sumida CD43, Refer to Figure 29,
R1=499k, R2=169k
10000
Battery Current (µA)
3.33
3.32
1000
V
OUT
(V)
Rlim=2.5k
Rlim=5k
3.31
3.30
3.29
3.28
100
10
0.0
1.0
2.0
Vbatt (V)
3.27
3.0
4.0
-40
-20
0
20
40
60
80
100
Temperature (degC)
Figure 13. No Load Battery Current vs. Vbatt
(Vout=3.3V), Li=22uH Sumida CD43
Figure 14. Output Voltage vs. Temperature,
Rlim=2.5k, Rload=3k, (Vout=3.3V),Li=22uH Sumida CD43
60
55
I
OQ
(µA)
3.0
2.5
2.0
I
BQ
(µA)
50
45
40
35
30
-40
-20
0
20
40
60
80
100
Temperature (degC)
1.5
1.0
0.5
0.0
-40
-20
0
20
40
60
80
100
Temperature (degC)
Figure 15. Io Pin Quiescent Current vs. Temperature,
(Vout=3.3V)
Figure 16. Ibatt Pin Quiescent Current vs. Temperature,
(Vout=3.3V), Vbatt=1.0V
Date: 11/30/04
SP6644/6645 High Efficiency Boost Regulator
© Copyright 2004 Sipex Corporation
5
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