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MAX619 데이터시트 PDF




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부품번호 MAX619 기능
기능 Regulated 5V Charge-Pump DC-DC Converter
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MAX619 데이터시트, 핀배열, 회로
19-0227; Rev 2; 5/96
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
Regulated 5V Charge-Pump
DC-DC Converter
_______________General Description
The MAX619 step-up charge-pump DC-DC converter
delivers a regulated 5V ±4% output at 50mA over tem-
perature. The input voltage range is 2V to 3.6V (two
battery cells).
The complete MAX619 circuit fits into less than 0.1in2 of
board space because it requires only four external
capacitors: two 0.22µF flying capacitors, and 10µF
capacitors at the input and output.
Low operating supply current (150µA max) and low
shutdown supply current (1µA max) make this device
ideal for small, portable, and battery-powered applica-
tions. When shut down, the load is disconnected from
the input.
The MAX619 is available in 8-pin DIP and SO packages.
________________________Applications
Two Battery Cells to 5V Conversion
Local 3V-to-5V Conversion
Portable Instruments & Handy-Terminals
Battery-Powered Microprocessor-Based Systems
5V Flash Memory Programmer
Minimum Component DC-DC Converters
Remote Data-Acquisition Systems
Compact 5V Op-Amp Supply
Regulated 5V Supply from Lithium Backup Battery
Switching Drive Voltage for MOSFETs in
Low-Voltage Systems
__________________Pin Configuration
____________________________Features
o Regulated 5V ±4% Charge Pump
o Output Current Guaranteed over Temperature
20mA (VIN 2V)
50mA (VIN 3V)
o 2V to 3.6V Input Range
o No Inductors; Very Low EMI Noise
o Ultra-Small Application Circuit (0.1in2)
o Uses Small, Inexpensive Capacitors
o 500kHz Internal Oscillator
o Logic-Controlled 1µA Max Shutdown
Supply Current
o Shutdown Disconnects Load from Input
o 8-Pin DIP and SO Packages
_______________Ordering Information
PART
MAX619CPA
MAX619CSA
MAX619C/D
MAX619EPA
MAX619ESA
MAX619MJA
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
* Dice are specified at TA = +25 °C.
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
__________Typical Operating Circuit
TOP VIEW
C1+ 1
IN 2
OUT 3
C2+ 4
MAX619
DIP/SO
8 C1-
7 SHDN
6 GND
5 C2-
INPUT
2V to 3.6V
10µF
ON/OFF
0.22µF
IN OUT
MAX619
SHDN
C1+ C2+
C1- C2-
GND
OUTPUT
5V, 20mA
10µF
0.22µF
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
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MAX619 pdf, 반도체, 판매, 대치품
Regulated 5V Charge-Pump
DC-DC Converter
_____________________Pin Description
PIN NAME
FUNCTION
1 C1+ Positive Terminal for C1
2 IN Input Supply Voltage
3
OUT
+5V Output Voltage. VOUT = 0V when in
shutdown mode.
4 C2+ Positive Terminal for C2
5 C2- Negative Terminal for C2
6 GND Ground
7 SHDN Active-High CMOS Logic-Level Shutdown Input
8 C1- Negative Terminal for C1
_______________Detailed Description
Operating Principle
The MAX619 provides a regulated 5V output from a 2V
to 3.6V (two battery cells) input. Internal charge pumps
and external capacitors generate the 5V output, elimi-
nating the need for inductors. The output voltage is
regulated to 5V ±4% by a pulse-skipping controller that
turns on the charge pump when the output voltage
begins to droop.
To maintain the greatest efficiency over the entire input
voltage range, the MAX619’s internal charge pump
operates as a voltage doubler when VIN ranges from
3.0V to 3.6V, and as a voltage tripler when VIN ranges
from 2.0V to 2.5V. When VIN ranges from 2.5V to 3.0V,
the MAX619 switches between doubler and tripler
mode on alternating cycles, making a 2.5 x VIN charge
pump. To further enhance efficiency over the input
range, an internal comparator selects the higher of VIN
or VOUT to run the MAX619’s internal circuitry.
Efficiency with VIN = 2V and IOUT = 20mA is typically
80%.
Figure 1 shows a detailed block diagram of the
MAX619. In tripler mode, when the S1 switches close,
the S2 switches open and capacitors C1 and C2
charge up to VIN. On the second half of the cycle, C1
and C2 are connected in series between IN and OUT
when the S1 switches open and the S2 switches close,
as shown in Figure 1. In doubler mode, only C2 is
used.
During one oscillator cycle, energy is transferred from
the input to the charge-pump capacitors, and then
from the charge-pump capacitors to the output capaci-
tor and load. The number of cycles within a given time
frame increases as the load increases or as the input
supply voltage decreases. In the limiting case, the
charge pumps operate continuously, and the oscillator
frequency is nominally 500kHz.
Shutdown Mode
The MAX619 enters low-power shutdown mode when
SHDN is a logic high. SHDN is a CMOS-compatible
input. In shutdown mode, the charge-pump switching
action is halted, OUT is disconnected from IN, and
VOUT falls to 0V. Connect SHDN to ground for normal
operation. When VIN = 3.6V, VOUT typically reaches
5V in 0.5ms under no-load conditions after SHDN goes
low.
4 ________________________________________________________________________________________
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MAX619 전자부품, 판매, 대치품
Regulated 5V Charge-Pump
DC-DC Converter
Layout Considerations
The MAX619’s high oscillator frequency makes good
layout important. A good layout ensures stability and
helps maintain the output voltage under heavy loads.
For best performance, use very short connections to
the capacitors.
Paralleling Devices
Two MAX619s can be placed in parallel to increase
output drive capability. The IN, OUT, and GND pins
can be paralleled, but C1 and C2 pins cannot. The
input bypass capacitor and output filter capacitor are,
to some extent, shared when two circuits are paral-
leled. If the circuits are physically close together, it
may be possible to use a single bypass and a single
output capacitor, each with twice the value of the single
circuit. If the MAX619s cannot be placed close togeth-
er, use separate bypass and output capacitors. The
amount of output ripple observed will determine
whether single input bypass and output filter capacitors
can be used.
INPUT
MAX619
IN OUT
GND
5V, 40mA
___________________Chip Topography
C1+ C1-
SHDN
IN
0.115”
(2.921mm)
OUT GND
C2+
C2-
0.072”
(1.828mm)
TRANSISTOR COUNT: 599;
SUBSTRATE CONNECTED TO GND.
MAX619
IN OUT
GND
Figure 3. Paralleling Two MAX619s
________________________________________________________________________________________ 7
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