UCC39411_15 Datasheet, PDF (1/20 Pages) Texas Instruments – LOW-POWER SYNCHRONOUS BOOST CONVERTER

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UCC29411, UCC29412
UCC29413, UCC39411
UCC39412, UCC39413
SLUS245E – MARCH 2000 – REVISED JULY 2005
LOW-POWER SYNCHRONOUS BOOST CONVERTER
FEATURES
• 1 V Input Voltage Operation Start-Up 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 µA Shutdown Supply Current
• Output Reset Function with Programmable
Reset Period
VIN
SD/FB
RESB
CT
PW PACKAGE
(TOP VIEW)
1
8
2
7
3
6
4
5
VGD
VOUT
SW
GND
D PACKAGE
(TOP VIEW)
VOUT 1
VGD ₂
VIN ₃
SD/FB ₄
8 SW
7 ^GND
6 ^CT
5 ^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 µ F
VGD
8
100 µ F
1 ^VIN
START–UP
CIRCUITRY
22 µ H
+
SW
6
1 V TO 3.5 V
1.2 Ω
3.3 V 200 mW
VOUT
7
0.5 Ω
100 µ F
MODULATOR CONTROL CIRCUIT
SYNCHRONOUS RECTIFICATION CIRCUITRY
ANTI–CROSS CONDUCTION
START–UP
MULTIPLEXING LOGIC
MAX INPUT POWER CONTROL
ADAPTIVE CURRENT CONTROL
SD/FB 2
RESET CONTROL CIRCUIT
GLITCH SUPRESSION
PROGRAMMABLE TIMING
RRES
RESB
3
CT
4
GND ^CT
5
A. Pinout shown is for the TSSOP Package. Consult Package Descriptions for the 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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2005, Texas Instruments Incorporated