General Description
The HWD20011/HWD2001/HWD20012 compact, high
effIciency, step-up DC-DC converters fit in small MSOP
packages. They feature a built-in synchronous rectifier,
which improves efficiency and reduces size and cost
by eliminating the need for an external Schottky diode.
Quiescent supply current is only 16µA.
The input voltage ranges from 0.7V to VOUT, where
VOUT 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 0.3
Ω 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.
________________________Applications
Pagers
Wireless Phones
Medical Devices
Hand-Held Computers
PDAs
RF Tags
1 to 3-Cell Hand-Held Devices
____________________________Features
o 94% Efficient at 200mA Output Current
o 16µA Quiescent Supply Current
o Internal Synchronous Rectifier (no external diode)
o 0.1µA Logic-Controlled Shutdown
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)
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
1
GND
LBO
SHDN
REF
1
2
8
7
OUT
LX
LBI
FB
HWD20011
HWD2001
MSOP
TOP VIEW
3
4
6
5
1
2
3
4
5
10
9
8
7
6
OUT
LX
GND
BATT
CLSEL
LBO
LBI
FB
HWD20012
MSOP
SHDN
REF
HWD20011
HWD2001
INPUT
0.7V TO VOUT
SHDN
LX
LBO
OUT
LBI
0.1
µF
LOW-BATTERY
DETECT OUT
OFF
ON
REF
GND
FB
OUTPUT
3.3V, 5V, OR
ADJ (2V TO 5.5V)
UP TO 300mA
LOW-BATTERY
DETECT IN
PART
HWD20011EUA
-40°C to +85°C
TEMP. RANGE
PIN-PACKAGE
8 MSOP
_______________Ordering Information
HWD2001EUA
-40°C to +85°C
8 MSOP
HWD20012EUB
-40°C to +85°C
10 MSOP
Typical Operating Circuit
Pin Configurations
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