MAX1722 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 1.5uA IQ, Step-Up DC-DC Converters in Thin SOT23-5

19-1735; Rev 0; 7/01
1.5µA I_Q, Step-Up DC-DC Converters
in Thin SOT23-5
General Description
The MAX1722/MAX1723/MAX1724 compact, high-effi-
ciency, step-up DC-DC converters are available in tiny, 5-
pin thin SOT23 packages. They feature an extremely low
1.5µA quiescent supply current to ensure the highest pos-
sible light-load efficiency. Optimized for operation from
one to two alkaline or nickel-metal-hydride (NiMH) cells, or
a single Li+ cell, these devices are ideal for applications
where extremely low quiescent current and ultra-small size
are critical.
Built-in synchronous rectification significantly improves
efficiency and reduces size and cost by eliminating the
need for an external Schottky diode. All three devices fea-
ture a 0.5Ω N-channel power switch. The MAX1722/
MAX1724 also feature proprietary noise-reduction circuitry,
which suppresses electromagnetic interference (EMI)
caused by the inductor in many step-up applications. The
family offers different combinations of fixed or adjustable
outputs, shutdown, and EMI reduction (see Selector
Guide).
Pagers
Remote Controls
Remote Wireless
Transmitters
Personal
Medical Devices
Digital Still Cameras
Applications
Single-Cell Battery-
Powered Devices
Low-Power Hand-Held
Instruments
MP3 Players
Personal Digital
Assistants (PDA)
Typical Operating Circuit
IN
0.8V TO 5.5V
10µH
BATT
LX
Features
o Up to 90% Efficiency
o No External Diode or FETs Needed
o 1.5µA Quiescent Supply Current
o 0.1µA Logic-Controlled Shutdown
o ±1% Output Voltage Accuracy
o Fixed Output Voltage (MAX1724) or Adjustable
Output Voltage (MAX1722/MAX1723)
o Up to 150mA Output Current
o 0.8V to 5.5V Input Voltage Range
o 0.91V Guaranteed Startup (MAX1722/MAX1724)
o Internal EMI Suppression (MAX1722/MAX1724)
o Thin SOT23-5 Package (1.1mm max Height)
Ordering Information
PART
MAX1722EZK-T
MAX1723EZK-T
MAX1724EZK27-T
MAX1724EZK30-T
MAX1724EZK33-T
MAX1724EZK50-T
TEMP. RANGE
PIN-
TOP
PACKAGE MARK
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
ADQF
ADQG
ADQH
ADQI
ADQJ
ADQK
Selector Guide
PART
MAX1722EZK
MAX1723EZK
MAX1724EZK27
MAX1724EZK30
MAX1724EZK33
MAX1724EZK50
OUTPUT (V)
SHDN
LX
DAMPING
Adjustable
No
Yes
Adjustable
Yes
No
Fixed 2.7
Yes
Yes
Fixed 3.0
Yes
Yes
Fixed 3.3
Yes
Yes
Fixed 5.0
Yes
Yes
Pin Configurations
TOP VIEW
BATT 1
5 LX
ON
OFF
MAX1724
OUT
SHDN
GND
OUT
3.3V AT
UP TO 150mA
MAX1722
GND 2
FB 3
4 OUT
THIN SOT23-5
Pin Configurations are continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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