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參數資料
| 型號： | TK651XX |
| 廠商： | TOKO Inc. |
| 英文描述： | STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| 中文描述： | 升壓電壓電壓監控轉爐 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 138K |
| 代理商： | TK651XX |
January 1999 TOKO, Inc.
Page 1
TK651xx
VIN
GND
SW
LOI
VOUT
CIRCUIT
OSCILLATOR
Vref
UVLO
BLOCK DIAGRAM
ORDERING INFORMATION
TAPE/REEL CODE
TL: Tape Left
Tape/Reel Code
TK651xxM
VOLTAGE CODE
27 = 2.7 V
30 = 3.0 V
33 = 3.3 V
Voltage Code
DESCRIPTION
The TK651xx 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
TK651xx 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 2.7, 3.0 or 3.3 V output .
The output voltage is laser-trimmed. A Low Output Indicator
detector (LOI) 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 (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 should be taken to achieve reliability through the use
of Oxide, double Nitride passivation. The TK651xx is
available in a miniature 6-pin SOT-23L-6 surface mount
package.
Customized levels of accuracy in oscillator frequency and
output voltage are available.
TK651xx
GND
VIN
VOUT
LOI
SW
GND
20P
FEATURES
I
Guaranteed 0.9 V Operation
I
Very Low Quiescent Current
I
Internal Bandgap Reference
I
High Efficiency MOS Switching
I
Low Output Ripple
I
Microprocessor Reset Output
I
Laser-Trimmed Output Voltage
I
Laser-Trimmed Oscillator
I
Undervoltage Lockout
I
Regulation by Pulse Burst Modulation (PBM)
APPLICATIONS
I
Battery Powered Systems
I
Cellular Telephones
I
Pagers
I
Personal Communications Equipment
I
Portable Instrumentation
I
Portable Consumer Equipment
I
Radio Control Systems
STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR
相關PDF資料 |
PDF描述 |
|---|---|
| TK65218 | STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65218M | STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65218MTL | STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65221 | STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65221M | STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TK65218 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65218M | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65218MTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65218MTL/18M | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
| TK65221 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR |
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