Boost Converter. UCC19412 Datasheet

UCC19412 Converter. Datasheet pdf. Equivalent

Part UCC19412
Description Low Power Synchronous Boost Converter
Feature Low Power Synchronous Boost Converter application INFO available UCC19411/2/3 UCC29411/2/3 UCC3941.
Manufacture Unitrode
Datasheet
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UCC19412
Low Power Synchronous Boost Converter
application
INFO
available
UCC19411/2/3
UCC29411/2/3
UCC39411/2/3
PRELIMINARY
FEATURES
1V Input Voltage Operation Start-up
Guaranteed under FULL Load on
Main Output, and Operation Down to
0.5V
200mW Output Power at Battery
Voltages as low as 0.8V
Secondary 7V Supply from a Single
Inductor
Output Fully Disconnected in
Shutdown
Adaptive Current Mode Control for
Optimum Efficiency
High Efficiency over Wide Operating
Range
6µA Shutdown Supply Current
Output Reset Function with
Programmable Reset Period
DESCRIPTION
The UCC39411 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 3.3V, 5V, or adjustable output at 200mW. The UCC39411
family also provides an auxiliary 7V output, primarily for the gate drive
supply, which can be used for applications requiring an auxiliary output,
such as 5V, by linear regulating. The primary output will start up under full
load at input voltages typically as low as 0.8V with a guaranteed max of
1V, and will operate down to 0.5V once the converter is operating,
maximizing battery utilization.
The UCC39411 family is designed to accommodate demanding
applications such as pagers and cell phones that require high efficiency
over a wide operating range of several milli-watts to a couple of hundred
milli-watts. High efficiency at low output current is achieved by optimizing
switching and conduction losses with a low total quiescent current (50µA).
At higher output current the 0.5switch, and 1.2synchronous rectifier
along with continuous mode conduction provide high power efficiency. The
wide input voltage range of the UCC39411 family can accommodate other
power sources such as NiCd and NimH.
The 39411 family also provides shutdown control. Packages available are
the 8 pin SOIC (D), 8 pin DIP (N or J), and 8 pin TSSOP (PW) to optimize
board space.
SIMPIFIED BLOCK DIAGRAM AND APPLICATION CIRCUIT (UCC39412)
100µF
VGD
8
100µF
1
VIN
START-UP
CIRCUITRY
22µH
SW
6
+
1V TO 3.5V
VOUT 3.3V 200mW
1.2
7
0.5
100µF
SD/FB 2
MODULATOR CONTROL CIRCUIT
SYNCHRONOUS RECTIFICATION CIRCUITRY
ANTI-CROSS CONDUCTION
START-UP
MULTIPLEXING LOGIC
MAX INPUT POWER CONTROL
ADAPTIVE CURRENT CONTROL
RESET CONTROL CIRCUIT
GLITCH SUPRESSION
PROGRAMMABLE TIMING
RRES
RESB
3
CT
4
GND
5
CT
Note: Pinout shown is for the TSSOP Package. Consult Package Descriptions for DIP and SOIC configurations.
SLUS245A - MARCH 1999
UDG-98067



UCC19412
ABSOLUTE MAXIMUM RATINGS
VIN Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 10V
SD Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to VIN
VGD Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 14V
SW Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 15V
CONNECTION DIAGRAMS
DIL-8, SOIC-8 (TOP VIEW)
N or J Package, D Package
Currents are positive into, negative out of the specific terminal.
Consult Packaging Section of the Databook for thermal limita-
tions and considerations of packages.
VOUT 1
VGD 2
VIN 3
SD/FB 4
UCC19411/2/3
UCC29411/2/3
UCC39411/2/3
8 SW
7 GND
6 CT
5 RESB
TSSOP-8 (TOP VIEW)
PW Package
VIN 1
SD/FB 2
RESB 3
CT 4
8 VGD
7 VOUT
6 SW
5 GND
ELECTRICAL CHARACTERISTICS: TJ= 0°C to +70°C for the UCC39411/2/3, TJ = –40°C to +85°C for the
UCC29411/2/3, TJ = –55C to +125°C for the UCC19411/2/3, VIN = 1.25V for UCC39411/2, VIN = 2.5V for the UCC39413, TA=TJ.
UCC39411
UCC39412
UCC39413
UCC19411/2/3
UCC29411/2/3
PARAMETER
TEST CONDITIONS
MIN TYP MAX MIN TYP MAX UNITS
VIN Section
Minimum Start-up Voltage
No External VGD Load, TJ=25°C,
IOUT=60mA (Note 1)
0.8 1
.08 1
V
No External VGD Load, IOUT=60mA
(Note 1)
0.9 1.1
1.2 1.4
V
Minimum Dropout Voltage
No External VGD Load, IOUT=10mA
(Note 1)
0.5
0.7 V
Input Voltage Range
1.1 3.2 1.3 3.2 V
Quiescent Supply Current
(Note 2)
6 12
8 16 µA
Supply Current at Shutdown
SD = GND
6 12
8 16 µA
2





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