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MAX1672 Datasheet

Step-Up/Down DC-DC Converter in QSOP Package

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19-1307; Rev 0a; 11/97
EVAALVUAAILTAIOBNLEKIT
Step-Up/Down DC-DC Converter
in QSOP Package
________________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.
________________________Applications
Single-Cell, Lithium-Powered
Portable Devices
3.3V and Other Low-Voltage
Systems
Digital Cameras
2-Cell to 4-Cell AA Alkaline
Hand-Held Equipment
Battery-Powered Devices
with AC Input Adapters
__________Typical Operating Circuit
INPUT
1.8V TO 11V
IN
PGI
LX
PS
ON OFF
ON OFF
3.3V 5V
0.5A 0.8A
MAX1672
ONA
ONB
3/5
ILIM
REF
PGND
OUT
PG0
FB
GND
3.3V/5V
OUTPUT
LOW-BATTERY
DETECTOR
OUTPUT
____________________________Features
o Step-Up/Down Voltage Conversion
o 1.8V to 11V Input Range
o 3.3V/5V or Adjustable Output Voltage Range
o Output Current:
300mA at 5V (VIN 2.5V)
150mA at 5V (VIN 1.8V)
o Smaller Inductor than SEPIC and Flybacks
o Load Disconnects from Input in Shutdown
o Supply Current from Battery:
85µA (No-Load)
0.1µA (Shutdown)
o PGI/PGO Low-Battery Comparator
o 16-Pin QSOP Package
(same footprint as 8-pin SO)
o No External FETs Required
o Thermal and Short-Circuit Protection
______________Ordering Information
PART
MAX1672C/D
MAX1672EEE
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
*Dice are tested at TA = +25°C.
PIN-PACKAGE
Dice*
16 QSOP
__________________Pin Configuration
TOP VIEW
LX 1
PGND 2
ONB 3
ONA 4
3/5 5
PGI 6
PGO 7
ILIM 8
MAX1672
QSOP
16 LX
15 PGND
14 GND
13 REF
12 IN
11 PS
10 FB
9 OUT
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1672 Datasheet

Step-Up/Down DC-DC Converter in QSOP Package

No Preview Available !

Step-Up/Down DC-DC Converter
in QSOP Package
ABSOLUTE MAXIMUM RATINGS
IN, PS, LX, OUT, PGO to GND ......................... -0.3V to +11.5V
ILIM, ONA, ONB, FB, 3/5,
REF, PGI to GND......................................-0.3V to (VPS + 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
OUT Short Circuit to GND ..........................................Continuous
Output Current ..................................................................350mA
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate above +70°C by 8.3mW/°C).......667mW
Operating Temperature Range ......................... -40°C to +85°C
Junction Temperature .................................................... +150°C
Storage Temperature Range ........................... -65°C to +160°C
Lead Temperature (soldering, 10sec) ............................ +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VPS = 6V, CREF = 0.1µF, COUT = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
Input Voltage
Startup Voltage
Output Voltage
FB = GND,
IOUT = 0mA to
150mA
CONDITIONS
3/5 = GND
3/5 = PS
TA = 0°C to +85°C
TA = -40°C to +85°C
TA = 0°C to +85°C
TA = -40°C to +85°C
MIN
1.8
4.8
4.75
3.17
3.13
TYP MAX UNITS
11.0 V
0.9 V
5.2
5.00 5.25
V
3.43
3.30 3.47
Output Voltage Adjustment
Range
1.25 5.5 V
Output Load Regulation
Output Line Regulation
Quiescent Current
Shutdown Quiescent Current
VIN = 2V, 3/5 = GND, FB = GND, IOUT = 10mA to 150mA
VIN = 3V to 5V, 3/5 = GND, IOUT = 100mA
ONA = PS or ONB = GND, current measured into PS pin,
IOUT = 0mA
ONA = GND, ONB = PS, current measured into PS pin
0.003
0.15
85
0.1
%/mA
%/V
125 µA
1 µA
Reference Voltage
IREF = 0mA
FB Voltage
OUT = FB
FB Dual-Mode Trip Threshold
FB Input Current
IN Input Current
LX On-Resistance
LX Leakage Current
Hysteresis = 15mV typical
VFB = 1.3V
VIN = GND to 11V
VPS = 5.5V, ILX = 50mA
VPS = 2.7V, ILX = 50mA
VLX = 11V, ONA = GND, ONB = PS
LX Current Limit
ILIM = GND
ILIM = PS
Output PFET Resistance
Output PFET Leakage Current
Output PFET Current Limit
VPS = 5.5V, IOUT = 50mA
VPS = 2.7V, IOUT = 50mA
VOUT = 0V, ONA = GND, ONB = PS
VPS = 5.5V
TA = 0°C to +85°C
TA = -40°C to +85°C
TA = 0°C to +85°C
TA = -40°C to +85°C
TA = 0°C to +85°C
TA = -40°C to +85°C
1.21 1.25 1.29 V
1.21 1.25 1.29
1.20 1.30
V
70 mV
1 50 nA
3 6 µA
0.6 1.3
0.9 2.0
0.1 1 µA
0.35 0.5 0.65
0.3 0.5 0.7
A
0.6 0.8 1.0
0.5 0.8 1.1
1.2 2.4
2.3 4.6
0.1 1 µA
0.35 0.7
1.4 A
2 _______________________________________________________________________________________


Part Number MAX1672
Description Step-Up/Down DC-DC Converter in QSOP Package
Maker Maxim
Total Page 12 Pages
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