TK65025MTL TOKO, TK65025MTL Datasheet

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TK65025MTL

Manufacturer Part Number
TK65025MTL
Description
IC CONVERTER VOLT STEP-UP SOT23L
Manufacturer
TOKO
Type
Step-Up (Boost)r
Datasheet

Specifications of TK65025MTL

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
3V
Current - Output
4mA
Frequency - Switching
83kHz
Voltage - Input
0.9 ~ 1.6 V
Operating Temperature
-20°C ~ 80°C
Mounting Type
Surface Mount
Package / Case
SOT-23L-6
Power - Output
400mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
TK65025MTLTR
TK65025TR
February, 1997 Toko, Inc.
FEATURES
DESCRIPTION
designed for portable battery-powered systems, capable
of operating from a single battery cell down to 0.9 V. The
TK65025 provides the power switch and the control circuit
for a boost converter. The converter takes a DC input and
boosts it up to 3 volts. This regulated 3 volt output is
typically used to supply power to a microprocessor-con-
trolled system.
internal detector monitors the output voltage and provides
an active-low microprocessor reset signal whenever the
output voltage falls below an internally preset limit. An
internal undervoltage lockout 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
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 IND pin of the IC. Special care has been taken to
Guaranteed 0.9 V Operation
Very Low Quiescent Current
Internal Bandgap Reference
High Efficiency MOS Switching
Low Output Ripple
Microprocessor Reset Output
Laser-Trimmed Output Voltage
Laser-Trimmed Oscillator
Undervoltage Lockout
Regulation by Pulse Burst Modulation (PBM)
The TK65025 Low Power Step-Up DC-DC converter is
The output voltage is laser-trimmed to 3.0 V. An
ORDERING INFORMATION
TK65025M
OUT
pin at the IC. PBM is the process in
STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
TAPE/REEL CODE
BX : Bulk/Bag
TL : Tape Left
Tape/Reel Code
APPLICATIONS
achieve high reliability through the use of Oxide, double
Nitride passivation. The TK65025 is available in a very
small plastic surface mount package. (SOT-23L)
and output voltage are available.
V IN
Battery Powered Systems
Cellular Telephones
Pagers
Personal Communications Equipment
Portable Instrumentation
Portable Consumer Equipment
Radio Control Systems
Customized levels of accuracy in oscillator frequency
1
IND
3
BLOCK DIAGRAM
CONTROL
RC OSC.
CIRCUIT
TK65025M
GND
V
2,5
REF
GND
V IN
IND
UVLO
1
2
3
V OUT
4
TK65025
6
5
4
6
RESET
GND
V OUT
Page 1
RESET
2

Related parts for TK65025MTL

TK65025MTL Summary of contents

Page 1

... The average duty ratio is effectively modulated by the "bursting" and skipping of pulses which can be seen at the IND pin of the IC. Special care has been taken to ORDERING INFORMATION TK65025M February, 1997 Toko, Inc. APPLICATIONS Battery Powered Systems Cellular Telephones Pagers Personal Communications Equipment ...

Page 2

... Note 4: Output ripple depends on filter capacitor values, ESRs and the connection Note 5: When using specified TOKO inductor and Schottky diode with VF=0. 100 mA. By trading component size for better specifications, using Schottky diode with lower forward voltage, efficiency greater than 80% can be attained. MIN TYP 0. ...

Page 3

... I O (mA) 5 OUTPUT VOLTAGE vs. LOAD CURRENT 3 °C 2.5 V 3.0 1 2.9 1.3 V 2.0 V 2.8 2 100 I O (mA) 6 February, 1997 Toko, Inc. OSCILLATOR FREQUENCY vs. TEMPERATURE 100 µH Toko P/N: 636CY- 101M (D73 series -75 - (°C) A OUTPUT REGULATION VOLTAGE vs. TEMPERATURE 3.000 µH Toko P/N: ...

Page 4

... Although this also tends to increase the output ripple low frequency and has low magni- tude (e.g., 10 kHz and 10 mV) which tends little consequence. When any DC-DC converter is used to convert power February, 1997 Toko, Inc. ...

Page 5

... From an oscillator standpoint, the switching cycle con- sists of only an on-time and an off-time. But from an February, 1997 Toko, Inc. inductor current standpoint, the switching cycle breaks down into three important sections: on-time, off-time, and deadtime. The on-time of the switch and the inductor current are synonymous ...

Page 6

... Toko America, Inc. offers a wide range of inductor values and sizes to accommodate varying power level requirements. The following series of Toko inductors ...

Page 7

... This is why the applica- IN tion test circuit features an RC filter into the V February, 1997 Toko, Inc. current draw is very small, so the voltage drop across this filter resistor is negligible. The filter serves to average out the input ripple caused by the battery resistance. Note ...

Page 8

... The Toko D73 and D75 series inductors are particularly suited for the higher output current capability of the dual cell configuration. ...

Page 9

... It is left to the user to examine empirically the dynamic satura- tion phenomenon and determine what performance is ac- ceptable. In most cases no problem will be exhibited. February, 1997 Toko, Inc. TK65025 2 Page 9 ...

Page 10

... TK65025 Page 10 February, 1997 Toko, Inc. ...

Page 11

... February, 1997 Toko, Inc. TK65025 2 Page 11 ...

Page 12

... The information furnished by TOKO, Inc. is believed to be accurate and reliable. However, TOKO reserves the right to make changes or improvements in the design, specification or manufacture of its products without further notice. TOKO does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products ...

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