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UCC3945

Description
1V Synchronous Boost Converter
File Size180KB,11 Pages
ManufacturerETC
Download Datasheet Compare View All

UCC3945 Overview

1V Synchronous Boost Converter

application
INFO
available
UCC2941-3/-5/-ADJ
UCC3941-3/-5/-ADJ
1V Synchronous Boost Converter
FEATURES
1V Input Voltage Operation Startup
Guaranteed Under Full Load on Main
Output With Operation Down to 0.4V
Input Voltage Range of 1V to V
OUT
+
0.5V
500mW Output Power at Battery
Voltages as Low as 0.8V
Secondary 9V Supply From a Single
Inductor
DESCRIPTION
The UCC3941 family of low input voltage single inductor boost converters
are optimized to operate from a single or dual alkaline cell, and step up to
a 3.3V, 5V, or an adjustable output at 500mW. The UCC3941 family also
provides an auxiliary 9V 100mW output, primarily for the gate drive supply,
which can be used for applications requiring an auxiliary output such as a
5V supply by linear regulating. The primary output will start up under full
load at input voltages typically as low as 0.8V, with a guaranteed maximum
of 1V, and will operate down to 0.4V once the converter is operating, maxi-
mizing battery utilization.
Demanding applications such as Pagers and PDA’s require high efficiency
Adjustable Output Power Limit Control
from several milli-watts to several hundred milli-watts, and the UCC3941
family accommodates these applications with >80% typical efficiencies
Output Fully Disconnected in
over the wide range of operation. The high efficiency at low output current
Shutdown
is achieved by optimizing switching and conduction losses along with low
quiescent current. At higher output current the 0.25Ω switch, and 0.4Ω syn-
Adaptive Current Mode Control for
chronous rectifier, along with continuous mode conduction, provide high ef-
Optimum Efficiency
ficiency. The wide input voltage range on the UCC3941 family can
8µA Shutdown Supply Current
accommodate other power sources such as NiCd and NiMH.
Other features include maximum power control and shutdown control.
Packages available are the 8-pin SOIC (D) and 8-pin DIP (N or J).
SIMPLIFIED BLOCK DIAGRAM AND APPLICATION CIRCUIT
+
22µH
10µF
0.8V TO VOUT +0.5V
VIN
SW
3
8V
VGD
8
0.4Ω
UCC3941-3 = 3.3V
UCC3941-5 = 5.0V
UCC3941-ADJ = 1.30V TO 6V
VOUT
2
10µF
STARTUP
CIRCUITRY
0.25Ω
1
100µF
PLIM
SD
5
4
OPEN=SD
*SGND/FB
+
UCC3941-ADJ
1.25V
6
PGND
*FOR UCC3941-ADJ ONLY:
PIN 7 = SGND & PGND, PIN 6 = OUTPUT SENSE FEEDBACK, FB.
7
UDG-98147
SLUS242 - JULY 1999
FOR UCC3941-ADJ ONLY
MODULATOR CONTROL CIRCUIT
SYNCHRONOUS RECTIFICATION CIRCUITRY
ANTI-CROSS CONDUCTION
STARTUP
MULTIPLEXING LOGIC
MAXIMUM INPUT POWER CONTROL
ADAPTIVE CURRENT CONTROL

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UCC3945 UCC2941 UCC2943 UCC3945-ADJ UCC2943-ADJ UCC3943-ADJ UCC3943 UCC3941 UCC2945 UCC2945-ADJ
Description 1V Synchronous Boost Converter 1V Synchronous Boost Converter 1V Synchronous Boost Converter 1V Synchronous Boost Converter 1V Synchronous Boost Converter 1V Synchronous Boost Converter 1V Synchronous Boost Converter 1V Synchronous Boost Converter 1V Synchronous Boost Converter 1V Synchronous Boost Converter
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