Datasheet.kr   

MAX1676 데이터시트 PDF




Maxim Integrated에서 제조한 전자 부품 MAX1676은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 MAX1676 자료 제공

부품번호 MAX1676 기능
기능 Step-Up DC-DC Converters
제조업체 Maxim Integrated
로고 Maxim Integrated 로고


MAX1676 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




전체 12 페이지수

미리보기를 사용할 수 없습니다

MAX1676 데이터시트, 핀배열, 회로
AVAILABLE
EVALUATION KIT AVAILABLE
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
General Description
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 VOUT, where
VOUT can be set from 2V to 5.5V. Start-up is guaran-
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 0.3N-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
Pagers
Wireless Phones
Medical Devices
Hand-Held Computers
PDAs
RF Tags
1 to 3-Cell Hand-Held Devices
Functional Diagrams
Typical Operating Circuit
INPUT
0.7V TO VOUT
ON
OFF
SHDN
LX
MAX1674 OUT
MAX1675
OUTPUT
3.3V, 5V, OR
ADJ (2V TO 5.5V)
UP TO 300mA
LOW-BATTERY
DETECT IN
LBI LBO
REF FB GND
LOW-BATTERY
DETECT OUT
Pin Configuration0s.1µaFppear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
____________________________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 (MAX1676)
o 8-Pin and 10-Pin µMAX Packages
o Preassembled Evaluation Kit (MAX1676EVKIT)
_______________Ordering Information
PART
MAX1674EUA
MAX1675EUA
MAX1676EUB
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 µMAX
10 µMAX
TOP VIEW
Pin Configurations
FB 1
LBI 2
LBO 3
REF 4
MAX1674
MAX1675
8 OUT
7 LX
6 GND
5 SHDN
µMAX
FB 1
LBI 2
LBO 3
CLSEL 4
REF 5
MAX1676
µMAX
10 OUT
9 LX
8 GND
7 BATT
6 SHDN
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-1360; Rev 3; 3/00




MAX1676 pdf, 반도체, 판매, 대치품
MAX1674/MAX1675/MAX1676
High-Efficiency, Low-Supply-Current,
Compact, Step-Up DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
(VBATT = 2V, FB = OUT, RL = , TA = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
CLSEL Input Current
SHDN Input Current
LBO Off Leakage Current
SYMBOL
ICLSEL
I SHDN
I LBO
CONDITIONS
MAX1676, CLSEL = OUT
VSHDN = 0 or VOUT
VLBO = 5.5V, VLBI = 5.5V
MIN MAX UNITS
3 µA
75 nA
1 µA
Note 1: Start-up voltage operation is guaranteed with the addition of a Schottky MBR0520 external diode between the input and
output.
Note 2: Steady-state output current indicates that the device maintains output voltage regulation under load. See Figures 5 and 6.
Note 3: Device is bootstrapped (power to the IC comes from OUT). This correlates directly with the actual battery supply.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(L = 22µH, CIN = 47µF, COUT = 47µF 0.1µF, CREF = 0.1µF, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
100
90
80 VIN = 3.6V
VIN = 2.4V
70
60 VIN = 1.2V
50
40
30
20
10
0
0.01
0.1
1
VOUT = 5V
ILIMIT = 500mA
10 100 1000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
100
90
80
70
VIN = 2.4V
VIN = 3.6V
60 VIN = 1.2V
50
40
30
20
10
0
0.01
0.1
1
VOUT = 5V
ILIMIT = 1A
10 100 1000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
100
90
80
70
VIN = 1.2V
VIN = 2.4V
60
50
40
30
20
10
0
0.01
0.1
1
VOUT = 3.3V
ILIMIT = 500mA
10 100 1000
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
100
90
80
70
VIN = 1.2V
VIN = 2.4V
60
50
40
30
20
10
0
0.01
0.1
1
VOUT = 3.3V
ILIMIT = 1A
10 100 1000
LOAD CURRENT (mA)
REFERENCE OUTPUT VOLTAGE
vs. TEMPERATURE
1.300
1.298
1.296
IREF = 0
1.294
1.292
IREF = 100µA
1.290
-40 -20
0 20 40 60
TEMPERATURE (°C)
80 100
4 Maxim Integrated

4페이지










MAX1676 전자부품, 판매, 대치품
MAX1674/MAX1675/MAX1676
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 a built-in synchronous rectifier that
reduces cost by eliminating the need for an external
diode and improves overall efficiency by minimizing
losses in the circuit (see Synchronous Rectification sec-
tion for details). The internal MOSFET resistance is typi-
cally 0.3, which minimizes losses. The current limit of
the MAX1674 and MAX1675 are 1A and 0.5A, respec-
tively. The MAX1675’s lower current limit allows the use
of a physically smaller inductor in space-sensitive
applications. The MAX1676 features a circuit that elimi-
nates noise due to inductor ringing. In addition, the
MAX1676 offers a selectable current limit (0.5A or 1A)
for design flexibility.
PFM Control Scheme
A unique minimum-off-time, current-limited, pulse-fre-
quency-modulation (PFM) control scheme is a key fea-
ture of the MAX1674/MAX1675/MAX1676. This scheme
combines the high output power and efficiency of a
pulse-width-modulation (PWM) device with the ultra-low
quiescent current of a traditional PFM (Figure 1). There
is no oscillator; a constant-peak-current limit in the
switch allows the inductor current to vary between this
peak limit and some lesser value. At light loads, the
switching frequency is governed by a pair of one-shots
that set a typical minimum off-time (1µs) and a typical
maximum on-time (4µs). The switching frequency
depends upon the load and the input voltage, and can
range up to 500kHz. The peak current of the internal N-
channel MOSFET power switch is fixed at 1A
(MAX1674), at 0.5A (MAX1675), or is selectable
(MAX1676). Unlike conventional pulse-skipping DC-DC
converters (where ripple amplitude varies with input
voltage), ripple in these devices does not exceed the
product of the switch current limit and the filter-capaci-
tor equivalent series resistance (ESR).
Synchronous Rectification
The internal synchronous rectifier eliminates the need
for an external Schottky diode, thus reducing cost and
board space. During the cycle off-time, the P-channel
MOSFET turns on and shunts the MOSFET body diode.
SHDN
MINIMUM
OFF-TIME
ONE-SHOT
Q TRIG
ONE-SHOT
CLSEL
(MAX1676)
VIN VOUT
R3
R2
100k
S F/F Q
R
MAXIMUM
ON-TIME
ONE-SHOT
TRIG Q
ONE-SHOT
ERROR
AMPLIFIER
CURRENT-LIMIT
AMPLIFIER
LBO
R4
LBI
LOW-BATTERY
COMPARATOR
ZERO
EN CROSSING
AMPLIFIER
OUT 0.1µF 47µF
MAX1674
MAX1675
MAX1676
P
LX
22µH
N
GND
BATT
(MAX1676)
DAMPING
SWITCH
FB
R1
200
R5
REFERENCE
R6
REF
0.1µF
VOUT
VIN
47µF
Figure 1. Simplified Functional Diagram
Maxim Integrated
7

7페이지


구       성 총 12 페이지수
다운로드[ MAX1676.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
MAX167

(MAX163 - MAX167) CMOS 12-Bit A/D Converters

Maxim Integrated Products
Maxim Integrated Products
MAX1672

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

Maxim Integrated
Maxim Integrated

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵