ADVANCED INFORMATION
ADVANCED INFORMATION
TK652xx
FEATURES
STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
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
s
Guaranteed 0.9 V Operation
s
Very Low Quiescent Current
s
Internal Bandgap Reference
s
High Efficiency MOS Switching
s
s
s
s
Low Output Ripple
Laser-Trimmed Output Voltage
Low Output Voltage Monitor
Low Battery Monitor
s
Undervoltage Lockout
s
Regulation by Pulse Burst Modulation (PBM)
DESCRIPTION
The TK652xx 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
TK652xx 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 1.8, 2.1, or 2.4 V.
The output voltage is laser-trimmed. Two internal detectors
monitor the output voltage and battery voltage. The Low
Output Indicator (LOI) generates an active low when the
battery voltage falls below 90 % of the output voltage. The
Low Battery Indicator (LBI) generates an active low when
the battery voltage falls below 1.1 V. These outputs can be
used to notify the microprocessor or power monitor circuit
of a fault condition. 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
high reliability through the use of Oxide, double Nitride
passivation. The TK652xx is available in a miniature
SOT-23L-6 surface mount package.
Customized levels of accuracy in oscillator frequency and
output voltage are available.
TK652xx
VIN
20P
LOI
LBI
SW
GND
VOUT
BLOCK DIAGRAM
SW
VOUT
LBI
Vref
UVLO
ORDERING INFORMATION
TK652xxM
Tape/Reel Code
Voltage Code
VIN
CONTROL
CIRCUIT
LOI
OSCILLATOR
VOLTAGE CODE
18 = 1.8 V
21 = 2.1 V
24 = 2.4 V
TAPE/REEL CODE
TL: Tape Left
GND
January 1999 TOKO, Inc.
Page 1
TK652xx
ADVANCED INFORMATION
ABSOLUTE MAXIMUM RATINGS
All Pins Except SW and GND .................................... 6 V
SW Pin ....................................................................... 9 V
Power Dissipation (Note 1) ................................ 400 mW
Storage Temperature Range ................... -55 to +150
°C
Operating Temperature Range ...................-20 to +80
°C
Junction Temperature ........................................... 150
°C
TK652xx ELECTRICAL CHARACTERISTICS
Over operating temperature range and supply voltage range, unless otherwise specified.
SYMBOL
V
IN
f
OSC
V
OUT(REG)
∆V
OUT(LOAD)
∆V
OUT(LINE)
D
OSC
V
LBI
PARAMETER
Supply Voltage
Internal Oscillator Frequency
Regulation Threshold of V
OUT
Load Regulation of V
OUT(REG)
Line Regulation of V
OUT(REG)
On-time Duty Ratio of Oscillator
Low Battery Indicator Threshold
T
A
= 25 ° C
T
A
= 25 ° C
V
IN
= 1.3 V, I
OUT
= 0 to 4 mA
∆V
IN
= 0.70 V, I
OUT
= 1 mA
T
A
= 25 ° C
T
A
= 25 ° C, I
OUT
= 1 mA
-20
44
1.05
TEST CONDITIONS
MIN
0.90
72
-3%
83
V
OUT
0
0
48
1.10
TYP
MAX
1.60
96
+3%
50
20
54
1.15
UNITS
V
kH z
V
mV
mV
%
V
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.
GENERAL CIRCUIT
VIN
I(VIN)
300 kΩ
LOI
300 kΩ
LBI
GND
VOUT
SW
IB
VIN
L
D
I(VOUT)
IOUT
VOUT
C
Page 2
January 1999 TOKO, Inc.
ADVANCED INFORMATION
FINAL TEST CIRCUIT
300 kΩ
VIN
LOI
300 kΩ
TK652xx
CN
10 µF
LBI
SW
GND
VOUT
IB
VIN
L = 95 µF
CS
220 pF
D
RS
ROF
+ 15
CU
10 µF
+
IOUT
VOUT
CD
10 µF
Note: Inductor L: Toko A682AE-014 or equivalent
Diode D: LL101
Capacitors C
N
:C
D
:C
U
: Panasonic TE series,
ECS-TOJY106R
1K
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.
The Bench Test Circuits shown on the following pages are the circuits 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.
January 1999 TOKO, Inc.
Page 3
TK652xx
SYMBOL
I
B(Q)
I(V
IN
)
I(V
OUT
)
∆f
OSC
/∆T
V
OUT(REG)
∆V
OUT
/∆T
V
OUT(LOI)
∆V
OUT(LOI)
R
SW(ON)
EFF
V
ULV
ADVANCED INFORMATION
TK65218 ELECTRICAL CHARACTERISTICS
Over operating temperature range and supply voltage range, unless otherwise specified.
PARAMETER
No Load Battery Current (Note 3)
Quiescent Current into V
IN
Pin
Quiescent Current into V
OUT
Pin
Temperature Stability of Oscillator
Regulation Threshold of V
OUT
Temperature Stability of V
OUT(REG)
V
OUT
During LOI Transition
V
OUT(LOI)
Threshold Hysteresis
On-resistance of SW Pin
Converter Efficiency (Notes 2,3)
Undervoltage Lockout Voltage
TEST CONDITIONS
V
IN
= 1.3 V, I
OUT
= 0 mA,
T
A
= 25 ° C
V
IN
= 1.3 V, I
OUT
= 0 to 4 mA,
T
A
= 25 ° C
V
IN
= 1.3 V, I
OUT
= 0 mA
V
IN
= 1.3 V,
No Pulse Skipping
T
A
= 25 ° C
V
IN
= 1.3 V, I
OUT
= 1 mA
V
IN
= 1.3 V, T
A
= 25 ° C
T
A
= 25 ° C
V
OUT
= V
OUT(REG)
, T
A
= 25 ° C
V
IN
= 1.3 V, I
OUT
= 6 mA,
L = 100 µH, D73 Coil
T
A
= 25 ° C, (Note 4)
V
IN
= 0.9 V, T
A
= 25 ° C,
L = 95 µH, 3DF Coil
V
IN
= 1.1 V, T
A
= 25 ° C,
L = 95 µH, 3DFCoil
I
OUT(MAX)
Maximum I
OUT
for Converter
(Notes 1,3)
V
IN
= 1.3 V, T
A
= 25 ° C,
L = 95 µH, 3DFCoil
V
IN
= 0.9 V, T
A
= 25 ° C,
L = 39 µH, D73 Coil
V
IN
= 1.1 V, T
A
= 25 ° C,
L = 39 µH, D73 Coil
5
6
7
1.55
1.746
MIN
TYP
40
11
12
0.1
1.800
100
1.62
25
1.0
76
0.47
7.0
13.0
15.0
17.0
28.0
0.79
1.68
1.845
MAX
60
20
20
UNITS
µA
µA
µA
%/° C
V
ppm/° C
V
mV
ohm
%
V
mA
mA
mA
mA
mA
Inductor L: Toko A682AE-014 or equivalent
Diode D: LL103A or equivalent
Capacitors C
N
:C
O
:C
B
: Panasonic TE series,
I(VIN)
ECS-TOJY106R
RN
1K
CN
10 µF
BENCH TEST CIRCUIT
300 kΩ
VIN
LOI
300 kΩ
LBI
GND
VOUT
IND
IB
VIN
L = 95 µH
CB
10 µF
CS
220 pF
D
RS
I(VOUT)
IOUT
VOUT
CO
10 µF
Note 1: Maximum load current depends on
inductor value and input voltages.
Note 2: Output ripple depends on filter
capacitor values, ESRs and the
inductor value.
Note 3: When using specified Toko inductor
and Schottky diode with V
F
= 0.45 V
@ 100 mA.
Note 4: Regulation not guaranteed.
1K
Page 4
January 1999 TOKO, Inc.
ADVANCED INFORMATION
TYPICAL PERFORMANCE CHARACTERISTICS
TK65218
OSCILLATOR FREQUENCY
VS.
TEMPERATURE
91
TK652xx
OUTPUT REGULATION VOLTAGE
VS.
TEMPERATURE
1.800
BATTERY CURRENT
VS.
INPUT VOLTAGE
200
160
120
80
40
TA = 25
°C
NO LOAD
VOUT(REG) (V)
87
fOSC (kHz)
1.795
IB (µA)
83
1.790
79
1.785
75
-50
0
50
100
1.780
-50
0
50
100
0
0.1
0.5
VIN (V)
1.0
1.5
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT VOLTAGE
VS.
LOAD CURRENT
1.9
L = 95 µH
TOKO P/N: A682AE-014
(3DF SERIES)
OUTPUT VOLTAGE
VS.
LOAD CURRENT
1.9
L = 100 µH
TOKO P/N: 636CY-101M
(D73F SERIES)
OUTPUT VOLTAGE
VS.
LOAD CURRENT
1.9
L = 39 µH
TOKO P/N: 636CY-390M
(D73 SERIES)
TA = 25
°C
TA = 25
°C
TA = 25
°C
1.8
1.8
1.8
VOUT (V)
VOUT (V)
VOUT (V)
VIN = 0.9 V
1.7
1.7
VIN = 0.9 V
1.3 V
1.6 V
1.7
VIN = 0.9 V
1.3 V
1.6 V
1.1 V
1.3 V
1.6 V
1.6
1.1 V
1.6
1.1 V
1.6
1.5
1
10
IOUT (mA)
100
1.5
1
10
IOUT (mA)
100
1.5
1
10
IOUT (mA)
100
EFFICIENCY
VS.
LOAD CURRENT
80
75
70
EFF (%)
L = 95 µF
TOKO P/N: A682AE-014
(3DF SERIES) SMALL COIL
EFFICIENCY
VS.
LOAD CURRENT
85
80
75
TA = 25
°C
1.6 V
100
80
MAXIMUM OUTPUT CURRENT
VS.
INDUCTOR VALUE
NO PULSE
SKIPPING
MODE
TA = 25
°C
TA = 25
°C
1.6 V
IOUT(MAX) (mA)
EFF (%)
60
1.3
40
20
0
0
1.1 V
VIN = 0.9 V
40
80
120
160
INDUCTOR VALUE (µH)
1.6 V
65
1.1 V
60
VIN = 0.9 V
55
50
0.1
1.3 V
70
65
60
55
0.1
VIN = 0.9 V
1.3 V
1.1 V
L = 100 µF
TOKO P/N: A636CY-101M
(D73 SERIES) LARGER COIL
1
10
IOUT (mA)
100
1
10
IOUT (mA)
100
January 1999 TOKO, Inc.
Page 5
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