MAX1672 Maxim, MAX1672 Datasheet

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MAX1672

Manufacturer Part Number
MAX1672
Description
Step-Up/Down DC-DC Converter in QSOP Package
Manufacturer
Maxim
Datasheet
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________________General Description
The MAX1672 integrates a step-up DC-DC converter with a
linear regulator to provide step-up/down voltage conver-
sion. This device provides a constant output voltage for
inputs that vary above and below the output voltage. It has
a 1.8V to 11V input range and a preset 3.3V or 5V output.
The output can also be set from 1.25V to 5.5V using two
resistors. Typical efficiency is 85%.
The MAX1672’s step-up/linear-regulator configuration per-
mits the use of a single, physically smaller inductor than
can be used with competing SEPIC and flyback configura-
tions. Switch current is also selectable, permitting the use
of smaller inductors in low-current applications. The linear
regulator also acts as a filter to reduce output ripple voltage.
The MAX1672 has a low 85µA quiescent supply current, which
is further reduced to 0.1µA in logic-controlled shutdown. The
output voltage is disconnected from the input in shutdown.
The MAX1672 also has a PGI/PGO low-battery detector.
The MAX1672 comes in a 16-pin QSOP package (same size
as a standard 8-pin SO). For a larger device that delivers more
output current, refer to the MAX710/MAX711. The preassem-
bled MAX1672 evaluation kit is available to speed designs.
Single-Cell, Lithium-Powered
Portable Devices
3.3V and Other Low-Voltage
Systems
Digital Cameras
________________________Applications
19-1307; Rev 0a; 11/97
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
__________Typical Operating Circuit
1.8V TO 11V
3.3V
0.5A
INPUT
ON
ON
OFF
0.8A
OFF
5V
________________________________________________________________ Maxim Integrated Products
PGI
ONA
ONB
3/5
ILIM
REF
PGND
IN
MAX1672
2-Cell to 4-Cell AA Alkaline
Hand-Held Equipment
Battery-Powered Devices
with AC Input Adapters
GND
LX
OUT
PG0
PS
FB
Step-Up/Down DC-DC Converter
LOW-BATTERY
DETECTOR
OUTPUT
3.3V/5V
OUTPUT
*
____________________________Features
Dice are tested at T
__________________Pin Configuration
______________Ordering Information
MAX1672C/D
MAX1672EEE
Step-Up/Down Voltage Conversion
1.8V to 11V Input Range
3.3V/5V or Adjustable Output Voltage Range
Output Current:
Smaller Inductor than SEPIC and Flybacks
Load Disconnects from Input in Shutdown
Supply Current from Battery:
PGI/PGO Low-Battery Comparator
16-Pin QSOP Package
(same footprint as 8-pin SO)
No External FETs Required
Thermal and Short-Circuit Protection
TOP VIEW
PART
300mA at 5V (V
150mA at 5V (V
85µA (No-Load)
0.1µA (Shutdown)
in QSOP Package
PGND
ONB
ONA
PGO
ILIM
PGI
3/5
LX
A
-40°C to +85°C
= +25°C.
TEMP. RANGE
1
2
3
4
5
6
8
7
0°C to +70°C
IN
IN
MAX1672
≥ 2.5V)
≥ 1.8V)
QSOP
16
15
14
13
12
11
10
9
PIN-PACKAGE
Dice*
16 QSOP
LX
PGND
GND
REF
IN
PS
FB
OUT
1

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