Datasheet > TK65428MTL/428

TK65428MTL/428

更新时间： 2024-11-11 22:42:15

品牌	Logo	应用领域
TOKO		转换器电池监视器
页数	文件大小	规格书
28页	758K
描述
STEP-DOWN CONVERTER WITH BATTERY MONITOR

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TK65428MTL/428 数据手册

ADVANCED INFORMATION

TK654xx

ADVANCED

INFORMATION

STEP-DOWN CONVERTER WITH BATTERY MONITOR

FEATURES

APPLICATIONS

■ Minimum External Component Count (1 coil, 1 cap)

■ Miniature 6 Pin SOT23L-6 Surface Mount Package

■ Up To 95% Efficient

■ Battery Powered Systems

■ Cellular Telephones

■ Pagers

■ Personal Communications Equipment

■ Radio Controlled Systems

■ Toys

■ Extremely Low Operating Current (24 µA)

■ Low Quiescent Current (18 µA)

■ Low Ripple

■ Fast Transient Response

Driving the SB pin low will disable the TK654xx and drop

the quiescent current on the input supply to approximately

18 µA.

■ Linear Dropout Characteristics

■ Short Circuit Protection

■ Regulates Down to 1.8 V

Pulse Current Amplitude control is used to regulate the

voltage at the V_OUTpin of the IC. When the output voltage

of the TK654xx drops below the regulation threshold, a

current pulse is transferred from the input supply to the

output. TheTK654xxutilizesaproprietarycontrolscheme,

where the average amplitude of the current pulse is varied

depending upon the current loads. The proprietary

architecture allows fast transient response and minimal

ripple while maintaining ease-of-use and low component

count.

■ Synchronous Rectification

■ Internal Battery Monitor

DESCRIPTION

The TK654xx low power step-down converter is designed

for portable battery systems, capable of operating from a

singleLi-ionbatterycell ormultiplealkalineorrechargeable

(NiCd or NiMH) battery cells (up to 6 V). The TK654xx

provides the power switch, synchronous rectifier, and the

control circuit for a buck step-down converter. Only two

external components are required to complete the step-

down conversion.

The TK654xx is available in a miniature 6-pin SOT23L-6

surface mount package.

TK654xxM

The TK654xx provides laser-trimmed output voltages

ranging from 1.8 V to 3.3 V. The low resistance MOSFET

switch and synchronous rectifier allow average currents

up to 200 mA, while maintaining peak efficiencies up to

95%. A low-battery threshold and turn-off threshold can

be individually programmed by the user, utilizing a single

resistor divider connected to the Low Battery Input (LBI)

pin. When the resistively-divided supply voltage on the

LBIpindropsbelowapproximately1.22V, theLowBattery

Output (LBO) pin will become asserted. The dual-function

LBI pin can alternatively be used as a Standby (SB) pin.

LBO

LBI/SB

GND

OUT

BLOCK DIAGRAM

ORDERING INFORMATION

TK654xxM

CONTROL

CIRCUIT

OUT

GND

Tape/Reel Code

REF

OFF

LBO

Voltage Code

BATTERY

MONITOR

LBO

LBI/SB

VOLTAGE CODE

TAPE/REEL CODE

27 = 2.7 V

18 = 1.8 V

21 = 2.1 V

24 = 2.4 V

25 = 2.5 V

TL: Tape Left

30 = 3.0 V

33 = 3.3 V

September 1999 TOKO, Inc.

Page 1

12 3 4 5 6 7...28

中文翻译

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与TK65428MTL/428相关器件

型号	品牌	获取价格	描述	数据表
TK65429	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65429M	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65429MTL	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65429MTL/429	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65430	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65430M	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65430MTL	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65430MTL/430	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65431	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR
TK65431M	TOKO	获取价格	STEP-DOWN CONVERTER WITH BATTERY MONITOR

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