UCC29421

更新时间： 2024-11-07 22:52:43

品牌	Logo	应用领域
德州仪器 - TI		控制器
页数	文件大小	规格书
35页	602K
描述
Multimode High Frequency PWM Controller

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UCC29421 数据手册

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SLUS246C − OCTOBER 1999 − REVISED FEBRUARY 2005

Operation Down to an Input

Voltage of 1.8 V

simplified schematic block diagram and

application circuit

High Efficiency Boost, SEPIC or

Flyback (Buck-Boost) Topologies

1.8 V(MIN)

Drives External FETs for

High-Current Applications

VPUMP

VIN

2 CELL

ALKALINE/

NiCd OR

1 LI−ION

1.24 V

VREF

Up to 2-MHz Oscillator

Synchronizable Fixed Frequency

Operation

SYNC/SD

CHARGE

PUMP

VOUT

PWM

OSC

High-Efficiency Low-Power Mode

RSEN

RECT

VOUT

VPUMP

High-Efficiency at Very Low-Power

with Programmable Variable

Frequency Mode

RSEL

ANTI−

CROSS

COND.

Pulse-by-Pulse Current Limit

VGD

CHRG

5-µA Supply Current in Shutdown

150-µA Supply Current in Sleep

Mode

PWM CIRCUITRY

CURRENT LIMIT

ISENSE

PGND

X10

Selectable NMOS or PMOS

Rectification

50 mV TYP

LOW POWER

MODE

1.24 V

ERROR

AMP

Built-In Power-On Reset

(UCC39422 Only)

SLOPE

COMPENSATION

PFM MODE

CONTROL

Built-In Low-Voltage Detect

(UCC39422 Only)

COMP

PFM

GND

description

1.22V

The UCC39421 family of synchronous

RESET

UCC39422

ONLY

PWM controllers is optimized to operate

from dual alkaline/NiCd cells or a single

Lithium-Ion (Li-Ion) cell, and convert to

adjustable output voltages from 2.5 V to

8 V. For applications where the input

voltage does not exceed the output, a

standard boost configuration is used.

200 mS

RESET/

POR

1.18 V

RSADJ

VDET

LOWBAT

1.24 V

UDG−98122

For other applications where the input voltage can swing above and below the output, a 1:1 coupled inductor

(Flyback or SEPIC) is used in place of the single inductor. Fixed frequency operation can be programmed, or

synchronized to an external clock source. In applications where (at light loads) variable frequency mode is

acceptable, the IC can be programmed to automatically enter PFM (pulse frequency modulation) mode for an

additional efficiency benefit.

Synchronous rectification provides excellent efficiency at high power levels, where N- or P- type MOSFETs can

be used. At lower power levels (between 10% and 20% of full load) where fixed frequency operation is required,

low power mode is entered. This mode optimizes efficiency by cutting back on the gate drive of the charging

FET. At very low power levels, the IC enters a variable frequency mode (PFM). PFM can be disabled by the user.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...35

中文翻译

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UCC29421 替代型号

型号	品牌	替代类型	描述	数据表
TPS61030	TI	功能相似	96% EFFICIENT SYNCHRONOUS BOOST CONVERTER WITH 4A SWITCH

与UCC29421相关器件

型号	品牌	获取价格	描述	数据表
UCC29421N	TI	获取价格	Multimode High Frequency PWM Controller
UCC29421PW	TI	获取价格	Multimode High Frequency PWM Controller
UCC29421PWR	ETC	获取价格	Analog IC
UCC29421PWTR	TI	获取价格	Multimode High Frequency PWM Controller
UCC29422	TI	获取价格	Multimode High Frequency PWM Controller
UCC29422N	TI	获取价格	Multimode High Frequency PWM Controller
UCC29422PW	TI	获取价格	Multimode High Frequency PWM Controller
UCC29422PWG4	TI	获取价格	SWITCHING CONTROLLER, 2000kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, TSSOP-20
UCC29422PWR	ETC	获取价格	Analog IC
UCC29422PWTR	TI	获取价格	Multimode High Frequency PWM Controller

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