ADVANCED INFORMATION
January 1999 TOKO, Inc.
Page 1
TK65020
VIN
GND
SW
NC
VOUT
CONTROL
CIRCUIT
OSCILLATOR
Vref
UVLO
BLOCK DIAGRAM
ORDERING INFORMATION
TAPE/REEL CODE
TL: Tape Left
Tape/Reel Code
TK65020MTL
DESCRIPTION
The TK65020 low power step-up DC-DC converter is
designed for portable battery-powered systems, capable
of operating from a single battery cell down to 0.9 V. The
TK65020 provides the power switch and the control circuit
for a boost converter. The converter takes a DC input and
boosts it up to a regulated 2.5 V output .
The output voltage is laser-trimmed. An internal
Undervoltage Lockout (UVLO) circuit is utilized to prevent
the inductor switch from remaining in the “on” mode when
the battery voltage is too low to permit normal operation.
Pulse Burst Modulation (PBM) is used to regulate the
voltage at the V
OUT
pin of the IC. PBM is the process in
which an oscillator signal is gated or not gated to the switch
drive each period. The decision is made just before the
start of each cycle and is based on comparing the output
voltage to an internally-generated bandgap reference.
The decision is latched, so the duty ratio is not modulated
within a cycle. The average duty ratio is effectively
modulated by the “bursting” and skipping of pulses which
can be seen at the SW pin of the IC. Special care has been
taken to achieve reliability through the use of Oxide,
double Nitride passivation. The TK65020 is available in a
miniature 6-pin SOT-23L-6 surface mount package.
For other output levels, please refer to the TK651xx and
TK652xx Toko series of step-up converters.
ADVANCED
INFORMATION
TK65020
GND
VIN
VOUT
NC
SW
GND
20P
FEATURES
s
Guaranteed 0.9 V Operation
s
Very Low Quiescent Current
s
Internal Bandgap Reference
s
High Efficiency MOS Switching
s
Low Output Ripple
s
Laser-Trimmed Output Voltage
s
Laser-Trimmed Oscillator
s
Undervoltage Lockout
s
Regulation by Pulse Burst Modulation (PBM)
APPLICATIONS
s
Battery Powered Systems
s
Cellular Telephones
s
Pagers
s
Personal Communications Equipment
s
Portable Instrumentation
s
Portable Consumer Equipment
s
Radio Control Systems
STEP-UP VOLTAGE CONVERTER
ADVANCED INFORMATION
Page 2
January 1999 TOKO, Inc.
TK65020
Note 1: Derate at 0.8 mW/
o
C for operation above T
A
= 25
o
C ambient temperature, when heat conducting copper foil path is maximized on the printed
circuit board. When this is not possible, a derating factor of 1.6 mW/
°
C must be used.
TK65020 ELECTRICAL CHARACTERISTICS
Over operating temperature range and supply voltage range, unless otherwise specified.
ABSOLUTE MAXIMUM RATINGS
All Pins Except SW and GND .................................... 6 V
SW Pin ....................................................................... 9 V
Power Dissipation (Note 1) ................................. 400 mA
Storage Temperature Range ................... -55 to +150
°
C
Operating Temperature Range ................... -20 to +80
°
C
Junction Temperature ........................................... 150
°
C
L
O
B
M
Y
S
R
E
T
E
M
A
R
A
P
S
N
O
I
T
I
D
N
O
C
T
S
E
T
N
I
M
P
Y
T
X
A
M
S
T
I
N
U
V
N
I
e
g
a
t
l
o
V
y
l
p
p
u
S
0
9
.
0
0
6
.
1
V
I
)
Q
(
B
)
3
e
t
o
N
(
t
n
e
r
r
u
C
y
r
e
t
t
a
B
d
a
o
L
o
N
V
N
I
,
V
3
.
1
=
I
T
U
O
,
A
m
0
=
T
A
C
°
5
2
=
1
4
2
6
A
µ
V
(
I
N
I
)
V
o
t
n
i
t
n
e
r
r
u
C
t
n
e
c
s
e
i
u
Q
N
I
n
i
P
V
N
I
,
V
3
.
1
=
I
T
U
O
,
A
m
0
=
T
A
C
°
5
2
=
1
1
0
2
A
µ
V
(
I
T
U
O
)
V
o
t
n
i
t
n
e
r
r
u
C
t
n
e
c
s
e
i
u
Q
T
U
O
n
i
P
V
N
I
,
V
3
.
1
=
I
T
U
O
A
m
0
=
2
1
0
2
A
µ
f
C
S
O
y
c
n
e
u
q
e
r
F
r
o
t
a
ll
i
c
s
O
l
a
n
r
e
t
n
I
V
N
I
,
V
3
.
1
=
I
T
U
O
A
m
0
=
0
7
3
8
2
0
1
z
H
k
∆
f
C
S
O
/
∆
T
r
o
t
a
ll
i
c
s
O
f
o
y
t
il
i
b
a
t
S
e
r
u
t
a
r
e
p
m
e
T
V
N
I
,
V
3
.
1
=
g
n
i
p
p
i
k
S
e
s
l
u
P
o
N
1
.
0
C
°
/
%
D
C
S
O
r
o
t
a
ll
i
c
s
O
f
o
o
i
t
a
R
y
t
u
D
e
m
i
t
-
n
O
T
A
C
°
5
2
=
5
4
0
5
5
5
%
V
)
G
E
R
(
T
U
O
V
f
o
d
l
o
h
s
e
r
h
T
n
o
i
t
a
l
u
g
e
R
T
U
O
T
A
C
°
5
2
=
8
3
.
2
0
5
.
2
8
5
.
2
V
∆
V
T
U
O
/
∆
T
V
f
o
y
t
il
i
b
a
t
S
e
r
u
t
a
r
e
p
m
e
T
)
G
E
R
(
T
U
O
V
N
I
,
V
3
.
1
=
I
T
U
O
A
m
0
=
0
0
1
V
m
∆
V
)
D
A
O
L
(
T
U
O
V
f
o
n
o
i
t
a
l
u
g
e
R
d
a
o
L
)
G
E
R
(
T
U
O
V
N
I
,
V
3
.
1
=
I
T
U
O
A
m
4
o
t
0
=
0
0
5
V
m
∆
V
)
E
N
I
L
(
T
U
O
V
f
o
n
o
i
t
a
l
u
g
e
R
e
n
i
L
)
G
E
R
(
T
U
O
∆
V
N
I
V
5
2
.
0
=
0
2
-
0
3
V
m
R
)
N
O
(
W
S
n
i
P
W
S
f
o
e
c
n
a
t
s
i
s
e
r
-
n
O
T
A
≥
4
.
2
0
.
1
V
F
F
E
)
4
,
3
s
e
t
o
N
(
y
c
n
e
i
c
i
f
f
E
r
e
t
r
e
v
n
o
C
V
N
I
,
V
3
.
1
=
I
T
U
O
,
A
m
6
=
li
o
C
F
D
3
,
H
µ
5
9
=
L
6
7
%
V
V
L
U
e
g
a
t
l
o
V
t
u
o
k
c
o
L
e
g
a
t
l
o
v
r
e
d
n
U
T
A
)
5
e
t
o
N
(
,
C
°
5
2
=
5
4
.
0
9
7
.
0
V
I
)
X
A
M
(
T
U
O
I
m
u
m
i
x
a
M
T
U
O
r
e
t
r
e
v
n
o
C
r
o
f
)
4
,
2
s
e
t
o
N
(
V
N
I
T
,
V
1
.
1
=
A
,
C
°
5
2
=
li
o
C
F
D
3
,
H
µ
5
9
=
L
5
0
.
8
A
m
V
N
I
T
,
V
3
.
1
=
A
,
C
°
5
2
=
li
o
C
F
D
3
,
H
µ
5
9
=
L
9
0
.
5
1
A
m
V
N
I
T
,
V
1
.
1
=
A
,
C
°
5
2
=
li
o
C
3
7
D
,
H
µ
9
3
=
L
8
.
9
1
A
m
V
N
I
T
,
V
3
.
1
=
A
,
C
°
5
2
=
li
o
C
3
7
D
,
H
µ
9
3
=
L
0
.
8
3
A
m
ADVANCED INFORMATION
January 1999 TOKO, Inc.
Page 3
TK65020
BENCH TEST CIRCUIT
Above is the Final Test Circuit through which each of the production parts must pass. In this test circuit, the part is tested
against the specification limits in the data sheet (the min. and max. values in the Electrical Characteristics) at room
temperature, and is rejected if the tested values are outside the minimum (min.) and maximum (max.) values.
FINAL TEST CIRCUIT
VIN
GND
GND
NC
VOUT
SW
IB
L = 95 µF
D
IOUT
VOUT
RS
1 K
VIN
CN
10 µF
CD
10 µF
CS
220 pF
ROF
15
+
+
CU
10 µF
Inductor L: Toko A682AE-014 or equivalent
Diode D: LL101
Capacitors C
N
:C
U
:C
D
: Panasonic TE series,
ECS-TOJY106R
VIN
GND
GND
NC
VOUT
IND
IB
L = 95 µH
D
IOUT
VOUT
RN
1 K
RS
1 K
VIN
CN
10 µF
CO
10 µF
I(VIN)
CS
220 pF
I(VOUT)
CB
10 µF
Inductor L: Toko A682AE-014 or equivalent
Diode D: LL103A or equivalent
Capacitors C
N
:C
O
:C
B
: Panasonic TE series,
ECS-TOJY106R
Note 2:
Maximum load current depends on
inductor value and input voltages.
Note 3:
Output ripple depends on filter
capacitor values, ESRs and the
inductor value.
Note 4:
When using specified Toko inductor
and Schottky diode with V
F
= 0.45 V
@ 100 mA.
Note 5: Regulation not guaranteed
The Bench Test Circuit is used most of the time to measure the typical (typ.) values in the Electrical Characteristics
section, and make the Typical Performance graphs.
Note: In measuring the oscillator frequency and the Max I
OUT
on the bench, the converter was loaded until “no pulse
skipping” mode was achieved.
