POWER MANAGEMENT
1
www.semtech.com
SC1461
Multi Mode Capless Charge
TM
Pump
Features
Applications
Revision 1, December 2000
Typical Application Circuit
Description
The SC1461 is a versatile charge pump designed for use
in battery operated power supply applications. A simple,
low current boost circuit can be implemented without
costly inductors or capacitors. Internal MOSFETs and
control circuitry eliminate the need for costly board space
and design time. The small device footprint allows for
compact circuit design.
The SC1461 is a Capless
TM
charge pump for applications
that require up to 8mA of output current. Three modes
of output voltage can be programmed via the ADJ pin.
Modes include:
V
O
= (1.32*V
IN
) 4% @ 7mA of output current
V
O
= (1.515 * V
IN
) 4% @ 4mA of output current
and the adjustable mode where an external resistor
divider determines the output voltage.
The SC1461 is packaged in a 5 lead SOT-23 package.
K
Small size - 5 pin SOT-23 package
K
4% voltage accuracy
K
65uA typ. quiescent current
K
User selectable output voltages of 1.515* V
IN
,
1.32 * V
IN
, or adjustable output
K
All specifications rated over full temperature range
(-40C to 85C)
K
PDA Power Supplies
K
Notebook Power Supplies
K
Peripheral Card Supplies
K
Industrial Power Supplies
K
High Density DC/DC Conversion
R2
47nF
Cout
47nF
Cout
Vin = 3.3V
47nF
Cout
0.22uF
Cin
Vin = 2.5V
0.22uF
Cin
SC1461
3
1
2
4
5
ADJ
Disable
GND
Vo
Vin
Vin
Vo
SC1461
3
1
2
4
5
ADJ
Disable
GND
Vo
Vin
R1
Vin
Vo = 5.0V
Vo = 3.3V
0.22uF
Cin
SC1461
3
1
2
4
5
ADJ
Disable
GND
Vo
Vin
+
+
=
2
R
1
R
1
R
1
Vin
03
.
1
Vo
2
2000 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC1461
Electrical Characteristics
Absolute Maximum Ratings
r
e
t
e
m
a
r
a
P
l
o
b
m
y
S
m
u
m
i
x
a
M
s
ti
n
U
e
g
a
tl
o
V
y
l
p
p
u
S
V
N
I
4
+
o
t
3
.
0
-
V
e
g
a
tl
o
V
t
u
p
t
u
O
O
V
6
+
o
t
3
.
0
-
V
t
n
e
i
b
m
A
o
t
n
o
it
c
n
u
J
e
c
n
a
t
s
i
s
e
R
l
a
m
r
e
h
T
A
J
0
1
4
W
/
C
e
r
u
t
a
r
e
p
m
e
T
g
n
it
a
r
e
p
O
T
A
5
8
+
o
t
0
4
-
C
e
g
n
a
R
e
r
u
t
a
r
e
p
m
e
T
T
J
5
2
1
+
o
t
0
4
-
C
e
r
u
t
a
r
e
p
m
e
T
e
g
a
r
o
t
S
T
G
T
S
0
5
1
o
t
5
6
-
C
s
d
n
o
c
e
S
0
1
)
g
n
ir
e
d
l
o
S
(
e
r
u
t
a
r
e
p
m
e
T
d
a
e
L
T
L
0
0
3
C
Unless specified: 2.25V
Vin
3.63V, 0
Io
8mA, Cin = 0.22uF, Cout = 47nF, Ta = -40 to 85 C
r
e
t
e
m
a
r
a
P
l
o
b
m
y
S
s
n
o
it
i
d
n
o
C
n
i
M
p
y
T
x
a
M
s
ti
n
U
e
g
a
tl
o
V
y
l
p
p
u
S
t
u
p
n
I
V
N
I
5
2
.
2
3
6
.
3
V
t
n
e
r
r
u
C
y
l
p
p
u
S
t
u
p
n
I
I
N
I
,
D
N
G
=
E
L
B
A
S
I
D
,
J
D
A
I
O
V
,
A
m
0
=
N
I
V
3
.
3
=
5
6
0
0
1
A
V
=
E
L
B
A
S
I
D
,
D
N
G
=
J
D
A
N
I
I
O
V
,
A
m
0
=
N
I
V
3
.
3
=
1
.
0
1
e
g
a
tl
o
V
t
u
p
t
u
O
V
O
I
,
D
N
G
=
E
L
B
A
S
I
D
,
J
D
A
O
A
m
4
4
-
N
I
V
X
5
1
5
.
1
4
%
V
=
J
D
A
N
I
I
,
D
N
G
=
E
L
B
A
S
I
D
,
O
A
m
7
4
-
N
I
V
x
2
3
.
1
4
)
k
p
-
k
p
(
e
l
p
p
i
R
t
u
p
t
u
O
)
1
(
V
R
V
=
J
D
A
N
I
I
,
D
N
G
=
E
L
B
A
S
I
D
,
O
A
m
7
0
5
V
m
t
n
e
r
r
u
C
t
u
p
t
u
O
I
O
V
=
J
D
A
N
I
D
N
G
=
E
L
B
A
S
I
D
,
V
5
.
2
=
7
8
A
m
V
,
D
N
G
=
E
L
B
A
S
I
D
,
J
D
A
N
I
V
3
.
3
=
4
7
A
m
y
c
n
e
i
c
if
f
E
)
1
(
V
=
J
D
A
N
I
D
N
G
=
E
L
B
A
S
I
D
,
V
5
.
2
=
I
O
A
m
7
=
0
5
%
y
c
n
e
u
q
e
r
F
r
o
t
a
lli
c
s
O
)
2
(
C
S
O
V
=
J
D
A
N
I
D
N
G
=
E
L
B
A
S
I
D
,
V
5
.
2
=
2
1
z
H
M
V
,
D
N
G
=
E
L
B
A
S
I
D
,
J
D
A
N
I
V
3
.
3
=
5
.
3
1
t
a
n
o
it
a
l
u
g
e
R
o
t
e
m
i
T
n
O
-
n
r
u
T
)
1
(
t
N
O
V
=
J
D
A
N
I
D
N
G
=
E
L
B
A
S
I
D
,
V
5
.
2
=
I
O
C
,
A
m
7
=
T
U
O
F
n
7
4
=
5
2
s
e
g
a
tl
o
V
d
l
o
h
s
e
r
h
T
e
l
b
a
s
i
D
D
I
H
S
I
1
3
.
1
V
D
O
L
S
I
5
.
9
.
0
V
t
n
e
r
r
u
c
e
l
b
a
s
i
D
I
E
L
B
A
S
I
D
V
0
=
e
l
b
a
s
i
D
1
0
1
A
NOTES:
(1) All electrical characteristics are for the application circuit on page 1.
(2) Guaranteed by design.
(3) This device is ESD sensitive. Use of standard ESD handling precautions is required.
4
2000 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC1461
Vout Vs Iout (1.32 Mode, Vin = 2.25V)
2.5 00
2.6 00
2.7 00
2.8 00
2.9 00
3.0 00
3.1 00
3.2 00
0 00.0E+0
2. 0E-3
4. 0E-3
6. 0E-3
8. 0E-3
Iout (A)
Vo
u
t
(
V)
+4%
25C
- 40C
85C
-4%
Vout Vs Iout (1. 32 Mode, V in = 3.3V)
3.5 00
3.7 00
3.9 00
4.1 00
4.3 00
4.5 00
4.7 00
0 00. 0E+0
2.0 E-3
4.0 E-3
6.0 E-3
8.0 E-3
I out (A)
Vo
u
t
(
V
)
+4%
25C
- 40C
85C
-4%
Vout Vs Iout (1. 32 Mode, V in = 2 .5V)
2.5 00
2.6 00
2.7 00
2.8 00
2.9 00
3.0 00
3.1 00
3.2 00
3.3 00
3.4 00
3.5 00
0 00. 0E+0
2.0 E-3
4.0 E-3
6.0 E-3
8.0 E-3
I out (A)
Vo
u
t
(
V
)
+4%
25C
- 40C
85C
-4%
Vo ut Vs Io ut (1 .32 M od e, Vin = 3.6 3V )
3.5 00
3.7 00
3.9 00
4.1 00
4.3 00
4.5 00
4.7 00
4.9 00
5.1 00
0 00.0E+0
2. 0E-3
4. 0E-3
6. 0E-3
8. 0E-3
Io ut (A)
Vo
u
t
(
V)
+4%
25C
- 40C
85C
-4%
Typical Vout vs Iout
1.32 Mode
Vin = 2.25V
Typical Vout vs Iout
1.32 Mode
Vin = 3.30V
Typical Vout vs Iout
1.32 Mode
Vin = 2.50V
Typical Vout vs Iout
1.32 Mode
Vin = 3.63V
Typical Characteristics
5
2000 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC1461
Vout Vs Iout (1.515 Mode, Vin = 2.25V)
2.5 00
2.7 00
2.9 00
3.1 00
3.3 00
3.5 00
3.7 00
0 00.0E+0
2. 0E-3
4. 0E-3
6. 0E-3
8. 0E-3
Io ut (A)
Vo
u
t
(
V)
+4%
25C
- 40C
85C
-4%
Typical Vout vs Iout
1.515 Mode
Vin = 2.25V
Vout Vs Iout (1.515 Mode, Vin = 3.3V)
3.5 00
3.7 00
3.9 00
4.1 00
4.3 00
4.5 00
4.7 00
4.9 00
5.1 00
5.3 00
0 00.0E+0
2. 0E-3
4. 0E-3
6. 0E-3
8. 0E-3
Iout (A)
Vo
u
t
(
V)
+4%
25C
- 40C
85C
-4%
Typical Vout vs Iout
1.515 Mode
Vin = 3.30V
Vout Vs Iout (1.515 Mode, Vin = 2 .5V)
2.5 00
2.7 00
2.9 00
3.1 00
3.3 00
3.5 00
3.7 00
3.9 00
4.1 00
0 00.0E+0
2. 0E-3
4. 0E-3
6. 0E-3
8. 0E-3
Iout (A)
Vo
u
t
(
V)
+4%
25C
- 40C
85C
-4%
V o ut V s Iout (1 .5 15 Mo de , Vin = 3.63V)
3.5 00
4.0 00
4.5 00
5.0 00
5.5 00
6.0 00
0 00. 0E+0
2.0 E-3
4.0 E-3
6.0 E-3
8.0 E-3
Io ut (A)
Vo
u
t
(
V
)
+4%
25C
- 40C
85C
-4%
Typical Vout vs Iout
1.515 Mode
Vin = 2.50V
Typical Vout vs Iout
1.515 Mode
Vin = 3.63V
Typical Characteristics
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