MAX1674EUA Maxim Integrated Products, MAX1674EUA Datasheet

IC DC/DC CONV STEP-UP HE 8-UMAX

MAX1674EUA

Manufacturer Part Number
MAX1674EUA
Description
IC DC/DC CONV STEP-UP HE 8-UMAX
Manufacturer
Maxim Integrated Products
Type
Step-Up (Boost)r
Datasheet

Specifications of MAX1674EUA

Internal Switch(s)
Yes
Synchronous Rectifier
Yes
Number Of Outputs
1
Voltage - Output
3.3V, 5V, Adj
Current - Output
420mA
Frequency - Switching
500kHz
Voltage - Input
0.7 ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Power - Output
330mW
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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The MAX1674/MAX1675/MAX1676 compact, high-effi-
ciency, step-up DC-DC converters fit in small µMAX
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 V
V
teed from 1.1V inputs. The MAX1674/MAX1675/
MAX1676 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 MAX1674 has a 1A current limit. The
MAX1675 has a 0.5A current limit, which permits the
use of a smaller inductor. The MAX1676 comes in a
10-pin µMAX package and features an adjustable cur-
rent limit and circuitry to reduce inductor ringing.
________________________Applications
19-1360; Rev 3; 3/00
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
OUT
LOW-BATTERY
ON
DETECT IN
can be set from 2V to 5.5V. Start-up is guaran-
Pagers
Wireless Phones
Medical Devices
Hand-Held Computers
PDAs
RF Tags
1 to 3-Cell Hand-Held Devices
OFF
0.7V TO V
INPUT
Typical Operating Circuit
0.1µF
OUT
________________________________________________________________ Maxim Integrated Products
LBI
SHDN
REF
General Description
MAX1674
MAX1675
FB
Compact, Step-Up DC-DC Converters
High-Efficiency, Low-Supply-Current,
GND
OUT
LBO
LX
ADJ (2V TO 5.5V)
UP TO 300mA
3.3V, 5V, OR
OUTPUT
OUT
LOW-BATTERY
DETECT OUT
, where
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 (MAX1676)
o 8-Pin and 10-Pin µMAX Packages
o Preassembled Evaluation Kit (MAX1676EVKIT)
_______________Ordering Information
____________________________Features
MAX1674EUA
MAX1675EUA
MAX1676EUB
TOP VIEW
PART
CLSEL
LBO
LBO
REF
REF
LBI
LBI
FB
FB
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
-40°C to +85°C
1
2
3
4
1
2
3
4
5
MAX1674
MAX1675
MAX1676
µMAX
µMAX
Pin Configurations
10
6
5
9
8
7
6
8
7
8 µMAX
8 µMAX
10 µMAX
PIN-PACKAGE
OUT
LX
GND
OUT
LX
GND
BATT
SHDN
SHDN
1

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MAX1674EUA Summary of contents

Page 1

... LBI/LBO Low-Battery Detector , where OUT o Selectable Current Limit for Reduced Ripple o Low-Noise, Anti-Ringing Feature (MAX1676) o 8-Pin and 10-Pin µMAX Packages o Preassembled Evaluation Kit (MAX1676EVKIT) _______________Ordering Information PART MAX1674EUA MAX1675EUA MAX1676EUB TOP VIEW OUTPUT 3.3V, 5V, OR ADJ (2V TO 5.5V 300mA LOW-BATTERY DETECT OUT TEMP ...

Page 2

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters ABSOLUTE MAXIMUM RATINGS Supply Voltage (OUT to GND) ..............................-0.3V to +6.0V Switch Voltage (LX to GND) .....................-0. Battery Voltage (BATT to GND).............................-0.3V to +6.0V SHDN, LBO to GND ..............................................-0.3V to +6.0V LBI, ...

Page 3

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters ELECTRICAL CHARACTERISTICS (continued 2V OUT (V = 3.3V), R BATT OUT PARAMETER SYMBOL Operating Current into OUT (Note 3) Shutdown Current into OUT Efficiency LX Switch On-Time ...

Page 4

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters ELECTRICAL CHARACTERISTICS (continued) = ∞ 2V OUT -40°C to +85°C, unless otherwise noted.) (Note 4) BATT L A PARAMETER SYMBOL CLSEL Input Current I CLSEL SHDN Input ...

Page 5

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters  22µ 47µ 47µF IN OUT NO-LOAD BATTERY CURRENT vs. INPUT BATTERY VOLTAGE 160 140 120 I = 1A, 5.0V LIMIT 100 0.5A, 5.0V LIMIT ...

Page 6

... PIN MAX1674 MAX1676 MAX1675 — — Dual-Mode is a trademark of Maxim Integrated Products. 6 _______________________________________________________________________________________ Typical Operating Characteristics (continued) = 0.1µ +25°C, unless otherwise noted.) REF A LOAD-TRANSIENT RESPONSE MAX1674 TOC16 3.3V OUT I OUT 200mA/div V OUT 50mV/div AC COUPLED 5µs/div NAME Dual-Mode™ Feedback Input. Connect to GND for +5.0V output. ...

Page 7

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters Detailed Description The MAX1674/MAX1675/MAX1676 compact, step-up DC-DC converters start up with voltages as low as 0.9V and operate with an input voltage down to 0.7V. Consuming only 16µA of quiescent current, these devices offer ...

Page 8

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters As a result, the synchronous rectifier significantly improves efficiency without the addition of an external component. Conversion efficiency can be as high as 94%, as shown in the Typical Operating Characteristics. For low-voltage inputs ...

Page 9

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters Selecting the Output Voltage V can be set to 3.3V or 5.0V by connecting the FB OUT pin to GND (5V) or OUT (3.3V) (Figures 5 and 6). To adjust the output voltage, connect ...

Page 10

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters 47µF R1 200Ω BATT LX (MAX1676) OUT R3 CLSEL (MAX1676) LBI FB SHDN R2 MAX1674 100k MAX1675 MAX1676 REF LBO GND 0.1µF Figure 8. Setting Resistor Values for the Low-Battery Indicator when V < ...

Page 11

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters Table 1. Suggested Components PRODUCTION METHOD Sumida CD43 series Sumida CD54 series Coilcraft DT1608C Surface Mount Coilcraft DO1608C Coiltronics Uni-PAC Murata LQH4 series Miniature Through-Hole Sumida RCH654-220 Table 2. Surface-Mount Inductor Specifications MANUFACTURER Ω ...

Page 12

High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters Optional External Rectifier Although not required, a Schottky diode (such as the MBR0520) connected between LX and OUT allows lower start-up voltages (Figure 10) and is recommend- ed when operating at input voltages below ...

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