HWD20011 Datasheet, PDF (1/13 Pages) List of Unclassifed Manufacturers – High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters

High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
General Description ____________________________Features
The HWD20011/HWD2001/HWD20012 compact, high
o 94% Efficient at 200mA Output Current
effIciency, step-up DC-DC converters fit in small MSOP
packages. They feature a built-in synchronous rectifier, ^{o 16µA Quiescent Supply Current}
which improves efficiency and reduces size and cost
by eliminating the need for an external Schottky diode.
Quiescent supply current is only 16µA.
o Internal Synchronous Rectifier (no external diode)
o 0.1µA Logic-Controlled Shutdown
The input voltage ranges from 0.7V to V_OUT, where
V_OUT can be set from 2V to 5.5V. Start-up is guaran-
teed from 1.1V inputs. The HWD20011/HWD2001/
HWD20012 have a preset, pin-selectable output for 5V or
3.3V. The outputs can also be adjusted to other volt-
ages using two external resistors.
All three devices have a 0.3Ω N-channel MOSFET
power switch. The HWD20011 has a 1A current limit. The
HWD2001 has a 0.5A current limit, which permits the
use of a smaller inductor. The HWD20012 comes in a
10-pin MSOP package and features an adjustable cur-
rent limit and circuitry to reduce inductor ringing.
o LBI/LBO Low-Battery Detector
o Selectable Current Limit for Reduced Ripple
o Low-Noise, Anti-Ringing Feature (HWD20012)
o 8-Pin and 10-Pin MSOP Packages
o Preassembled Evaluation Kit (HWD20012EVKIT)
_______________Ordering Information
________________________Applications
Pagers
Wireless Phones
Medical Devices
Hand-Held Computers
PDAs
RF Tags
1 to 3-Cell Hand-Held Devices
Typical Operating Circuit
INPUT
0.7V TO V_OUT
PART
HWD20011EUA
HWD2001EUA
HWD20012EUB
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 MSOP
8 MSOP
10 MSOP
TOP VIEW
Pin Configurations
FB 1
LBI 2
LBO 3
HWD20011
HWD2001
8 OUT
7 LX
6 GND
ON
OFF
SHDN
LX
HWD20011_OUT
HWD2001
OUTPUT
3.3V, 5V, OR
ADJ (2V TO 5.5V)
UP TO 300mA
LOW-BATTERY
DETECT IN
LBI
REF
0.1µF
LBO
FB GND
LOW-BATTERY
DETECT OUT
REF 4
5 SHDN
MSOP
FB 1
LBI 2
LBO 3
CLSEL 4
REF 5
HWD20012
10 OUT
9 LX
8 GND
7 BATT
6 SHDN
MSOP
1