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UCC29412N Datasheet

  • UCC29412N

  • Current/Voltage-Mode SMPS Controller

  • 13頁

  • ETC

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UCC29411, UCC29412, UCC29413, UCC39411, UCC39412, UCC39413
LOW POWER SYNCHRONOUS BOOST CONVERTER
SLUS245D 鈥?MARCH 2000 鈥?REVISED NOVEMBER 2000
D
1-V Input Voltage Operation Start-Up
D
D
D
D
D
D
D
Ensured Under Full Load on Main Output,
and Operation Down to 0.5 V
200-mW Output Power at Battery Voltages
as Low as 0.8 V
Secondary 7-V Supply from a Single
Inductor
Output Fully Disconnected in Shutdown
Adaptive Current Mode Control for
Optimum Efficiency
High Efficiency Over Wide Operating Range
6-碌A(chǔ) Shutdown Supply Current
Output Reset Function with Programmable
Reset Period
VIN
SD/FB
RESB
CT
1
2
3
4
PW PACKAGE
(TOP VIEW)
8
7
6
5
VGD
VOUT
SW
GND
D OR N PACKAGE
(TOP VIEW)
VOUT
VGD
VIN
SD/FB
1
2
3
4
8
7
6
5
SW
GND
CT
RESB
description
The UCCx9411 family of low-input voltage, single-inductor-boost converters is optimized to operate from a
single or dual alkaline cell, and steps up to a 3.3-V, 5-V, or adjustable output at 200 mW. The UCCx9411 family
also provides an auxiliary 7-V output, primarily for the gate-drive supply, which can be used for applications
requiring an auxiliary output, such as 5 V, by linear regulating. The primary output starts up under full load at
input voltages typically as low as 0.8 V with a ensured max of 1 V, and operates down to 0.5 V once the converter
is operating, thereby maximizing battery usage.
simplified block diagram and application circuit
100
碌
F
VIN
22
碌
H
SW
1
VGD
8
100
碌
F
START鈥揢P
CIRCUITRY
0.5
鈩?/div>
3.3 V 200 mW
1.2
鈩?/div>
7
VOUT
100
碌
F
6
+
1 V TO 3.5 V
MODULATOR CONTROL CIRCUIT
SYNCHRONOUS RECTIFICATION CIRCUITRY
ANTI鈥揅ROSS CONDUCTION
START鈥揢P
MULTIPLEXING LOGIC
MAX INPUT POWER CONTROL
ADAPTIVE CURRENT CONTROL
R RES
RESB
SD/FB
2
RESET CONTROL CIRCUIT
GLITCH SUPRESSION
PROGRAMMABLE TIMING
3
CT
4
GND
5
CT
NOTE A: Pinout shown is for the TSSOP Package. Consult Package Descriptions for the DIP and SOIC configurations.
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
漏
2000, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
1

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