MAX770 반도체 회로 부품 판매점
5V/12V/15V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controllers
|
|
 Maxim Integrated |
19-0202; Rev 2; 11/96
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
5V/12V/15V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controllers
_______________General Description
The MAX770–MAX773 step-up switching controllers pro-
vide 90% efficiency over a 10mA to 1A load. A
unique current-limited pulse-frequency-modulation (PFM)
control scheme gives these devices the benefits of
pulse-width-modulation (PWM) converters (high efficiency
at heavy loads), while using less than 110µA of supply
current (vs. 2mA to 10mA for PWM converters).
These ICs use tiny external components. Their high
switching frequencies (up to 300kHz) allow surface-
mount magnetics of 5mm height and 9mm diameter.
The MAX770/MAX771/MAX772 accept input voltages
from 2V to 16.5V. Output voltages are preset at 5V,
(MAX770), 12V (MAX771), and 15V (MAX772); they can
also be adjusted using two resistors.
The MAX773 accepts inputs from 3V to 16.5V. For a wider
input range, it features an internal shunt regulator that
allows unlimited higher input voltages. The MAX773’s out-
put can be set to 5V, 12V, or 15V, or it can be adjusted
with two resistors.
The MAX770–MAX773 drive external N-channel MOSFET
switches, allowing them to power loads up to 15W. If less
power is required, use the MAX756/MAX757 or
MAX761/MAX762 step-up switching regulators with on-
board MOSFETs.
________________________Applications
Palmtops/Handy-Terminals
High-Efficiency DC-DC Converters
Battery-Powered Applications
Positive LCD-Bias Generators
Portable Communicators
Flash Memory Programmers
____________________________Features
o 90% Efficiency for 10mA to 1A Load Currents
o Up to 15W Output Power
o 110µA Max Supply Current
o 5µA Max Shutdown Current
o 2V to 16.5V Input Range
(MAX770/MAX771/MAX772)
o Internal Shunt Regulator for High Input Voltages
(MAX773)
o Preset or Adjustable Output Voltages
MAX770: 5V or Adjustable
MAX771: 12V or Adjustable
MAX772: 15V or Adjustable
MAX773: 5V, 12V, 15V, or Adjustable
o Current-Limited PFM Control Scheme
o 300kHz Switching Frequency
______________Ordering Information
PART
MAX770CPA
MAX770CSA
MAX770C/D
MAX770EPA
MAX770ESA
MAX770MJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883B.
_________________Pin Configurations
__________Typical Operating Circuit
INPUT
2V TO VOUT
ON/OFF
MAX771 EXT
SHDN
CS
N
OUTPUT
12V
REF
V+
FB AGND GND
TOP VIEW
EXT 1
V+ 2
FB 3
SHDN 4
MAX770
MAX771
MAX772
DIP/SO
8 CS
7 GND
6 AGND
5 REF
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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.
5V/12V/15V or Adjustable, High-Efficiency,
Low IQ, Step-Up DC-DC Controllers
ABSOLUTE MAXIMUM RATINGS
Supply Voltages
V+ to GND.............................................................-0.3V to 17V
V+ to SGND.............................................................-0.3V to 7V
SGND........................................................-0.3V to (V+ + 0.3V)
EXT, CS, REF, LBO, LBI, SHDN, FB.............-0.3V to (V+ + 0.3V)
EXTH, EXTL ..................................................-0.3V to (V+ + 0.3V)
V5, V12, V15 .............................................................-0.3V to 17V
GND to AGND .........................................................0.1V to -0.1V
ISGND ..................................................................................50mA
Continuous Power Dissipation (TA = +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)....727mW
8-Pin SO (derate 5.88mW/°C above +70°C) ................471mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C) ........640mW
14-Pin Plastic DIP
(derate 10.00mW/°C above +70°C) .............................800mW
14-Pin SO (derate 8.33mW/°C above +70°C) ..............667mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C) ......727mW
Operating Temperature Ranges
MAX77_C_ _ ........................................................0°C to +70°C
MAX77_E_ _......................................................-40°C to +85°C
MAX77_MJ_ ...................................................-55°C to +125°C
Junction Temperatures
MAX77_C_ _/E_ _ ..........................................................+150°C
MAX77_MJ_..................................................................+175°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
(V+ = 5V, ILOAD = 0mA, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Input Voltage Range
Minimum Start-Up Voltage
Supply Current
Standby Current
Output Voltage (Note 1)
SYMBOL
CONDITIONS
MAX770–772 (internal feedback resistors)
MAX770–772C/E (external resistors)
MAX770–772MJA (external resistors)
MAX773C/E
MAX773MJD
MAX770/MAX771/MAX772
V+ = 16.5V, SHDN = 0V (normal operation)
V+ = 10.0V, SHDN ≥ 1.6V (shutdown)
V+ = 16.5V, SHDN ≥ 1.6V (shutdown)
V+ = 2.0V to 5.0V, over full load range
V+ = 2.0V to 12.0V, over full load range
V+ = 2.0V to 15.0V, over full load range
MIN
2.0
3.0
3.1
3.0
3.1
4.80
11.52
14.40
Output Voltage Line Regulation
(Note 2)
Figure 2a, V+ = 2.7V to 4.5V,
ILOAD = 700mA, VOUT = 5V
Output Voltage Load Regulation
(Note 2)
Maximum Switch On-Time
Minimum Switch Off-Time
Efficiency
Reference Voltage
tON(max)
tOFF(min)
VREF
Figure 2a, V+ = 3V, ILOAD = 30mA to 1A,
VOUT = 5V
V+ = 4V, ILOAD = 500mA, VOUT = 5V
MAX77_C
IREF = 0µA
MAX77_E
MAX77_M
12
1.8
1.4700
1.4625
1.4550
TYP MAX UNITS
16.5
16.5
16.5 V
16.5
16.5
1.8 2.0
V
85 110
µA
25
µA
4
5.0 5.20
12.0 12.48
V
15.0 15.60
5 mV/V
20 mV/A
16 20
2.3 2.8
87
1.5 1.5300
1.5 1.5375
1.5 1.5450
µs
µs
%
V
2 _______________________________________________________________________________________
|
PDF 파일 내의 페이지 : 총 20 페이지
제조업체: Maxim Integrated
( maxim )
MAX770 controller
데이터시트 다운로드 :
[ MAX770.PDF ]
[ MAX770 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
관련 데이터시트
MAX770
5V/12V/15V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controllers - Maxim Integrated
MAX7705
P Power-Supply Monitor with Reset - Maxim Integrated
MAX771
5V/12V/15V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controllers - Maxim Integrated
MAX772
5V/12V/15V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controllers - Maxim Integrated
MAX773
5V/12V/15V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controllers - Maxim Integrated
MAX77301
Li+ Charger - Maxim Integrated
MAX774
-5V/-12V/-15V or Adjustable / High-Efficiency / Low IQ Inverting DC-DC Controllers - Maxim Integrated
MAX775
-5V/-12V/-15V or Adjustable / High-Efficiency / Low IQ Inverting DC-DC Controllers - Maxim Integrated
MAX77596
Buck Converter - Maxim Integrated