MAX619CSA-T [MAXIM]
Switched Capacitor Regulator, 0.05A, 500kHz Switching Freq-Max, CMOS, PDSO8, SO-8;
| 型号： | MAX619CSA-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Switched Capacitor Regulator, 0.05A, 500kHz Switching Freq-Max, CMOS, PDSO8, SO-8 转换器 泵 |
| 文件： | 总7页 (文件大小：68K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0227; Rev 2; 5/96
Re g u la t e d 5 V Ch a rg e -P u m p
DC-DC Co n ve rt e r
MAX619
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ Regulated 5V ±4% Charge Pump
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).
♦ Output Current Guaranteed over Temperature
20mA (V ≥ 2V)
IN
50mA (V ≥ 3V)
IN
2
The complete MAX619 circuit fits into less than 0.1in of
♦ 2V to 3.6V Input Range
board space because it requires only four external
capacitors: two 0.22µF flying capacitors, and 10µF
capacitors at the input and output.
♦ No Inductors; Very Low EMI Noise
2
♦ Ultra-Small Application Circuit (0.1in )
♦ Uses Small, Inexpensive Capacitors
♦ 500kHz Internal Oscillator
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.
♦ Logic-Controlled 1µA Max Shutdown
Supply Current
♦ Shutdown Disconnects Load from Input
♦ 8-Pin DIP and SO Packages
The MAX619 is available in 8-pin DIP and SO packages.
________________________Ap p lic a t io n s
_______________Ord e rin g In fo rm a t io n
Two Battery Cells to 5V Conversion
Local 3V-to-5V Conversion
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX619CPA
MAX619CSA
MAX619C/D
MAX619EPA
MAX619ESA
MAX619MJA
Portable Instruments & Handy-Terminals
Battery-Powered Microprocessor-Based Systems
5V Flash Memory Programmer
0°C to +70°C
0°C to +70°C
Dice*
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 Plastic DIP
8 SO
Minimum Component DC-DC Converters
Remote Data-Acquisition Systems
Compact 5V Op-Amp Supply
8 CERDIP
* Dice are specified at T = +25 °C.
A
Regulated 5V Supply from Lithium Backup Battery
Switching Drive Voltage for MOSFETs in
Low-Voltage Systems
__________________P in Co n fig u ra t io n
__________Typ ic a l Op e ra t in g Circ u it
TOP VIEW
IN
INPUT
2V to 3.6V
10µF
OUT
OUTPUT
5V, 20mA
10µF
C1+
IN
C1-
1
2
3
4
8
7
6
5
MAX619
GND
ON/OFF
SHDN
C1+
SHDN
GND
C2-
MAX619
C2+
C2-
OUT
C2+
0.22µF
0.22µF
C1-
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Re g u la t e d 5 V Ch a rg e -P u m p
DC-DC Co n ve rt e r
ABSOLUTE MAXIMUM RATINGS
V
IN
to GND ............................................................-0.3V to +5.5V
Operating Temperature Ranges
V
to GND.........................................................-0.3V to +5.5V
MAX619C_ _ .......................................................0°C to +70°C
MAX619E_ _ ....................................................-40°C to +85°C
MAX619MJA ..................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
OUT
SHDN to GND..............................................-0.3V to (V + 0.3V)
IN
I
Continuous (Note 1)..................................................120mA
OUT
Continuous Power Dissipation (T = +70°C)
A
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 5.88mW/°C above +70°C).........................471mW
CERDIP (derate 8.00mW/°C above +70°C).................640mW
MAX619
Note 1: The MAX619 is not short-circuit protected.
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 = 2V to 3.6V, C1 = C2 = 0.22µF, C3 = C4 = 10µF, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
IN
A
MIN
MAX
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
Input Voltage
V
2
3.6
5.2
V
V
IN
2.0V ≤ V ≤ 3.6V, 0mA ≤ I
≤ 20mA
IN
OUT
OUT
OUT
OUT
3.0V ≤ V ≤ 3.6V, 0mA ≤ I
≤ 50mA, MAX619C
≤ 45mA, MAX619E
≤ 40mA, MAX619M
IN
Output Voltage
V
OUT
4.8
5.0
3.0V ≤ V ≤ 3.6V, 0mA ≤ I
IN
3.0V ≤ V ≤ 3.6V, 0mA ≤ I
IN
Output Ripple
V
No load to full load
100
75
mV
RIPPLE
µA
No-Load Supply Current
I
IN
2V ≤ V ≤ 3.6V, I
IN OUT
= 0mA
170
1
MAX619C/E
MAX619M
0.02
Shutdown Supply
Current
2V
V
≤
V
≤
3.6V, I = 0mA,
OUT
IN
IN
= V
µA
SHDN
10
V
= 3V, I
= 3V, I
= 2V, I
= 20mA
= 30mA
= 20mA
82
82
IN
OUT
OUT
OUT
Efficiency
Eff
V
IN
%
V
IN
80
Switching Frequency
SHDN Input Threshold
At full load
500
kHz
V
V
0.7 x V
IN
IH
V
IL
0.4
±1
MAX619C/E
MAX619M
µA
SHDN Input Current
I
IH
V
= V
SHDN IN
±10
2
________________________________________________________________________________________
Re g u la t e d 5 V Ch a rg e -P u m p
DC-DC Co n ve rt e r
MAX619
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(T = +25°C, unless otherwise noted.)
A
EFFICIENCY vs. OUTPUT CURRENT
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE
INPUT CURRENT vs. OUTPUT CURRENT
AND INPUT VOLTAGE
1000
100
90
200
G
D
V
= 1.8V
180
160
140
120
100
SHDN = 0V
IN
85
80
F
V
IN
= 3.0V
E
C
V
IN
= 2.0V
B
10
IOUT
MAX
75
70
65
60
V
IN
V
IN
= 3.3V
A
B
1.8
2.0
18
36
80
60
40
1.0
A
V
IN
= 3.6V
C
D
2.4
2.7
41
64
V
IN
= 2.4V
E
F
3.0
3.6
72
94
SHDN = V
IN
0.1
V
IN
= 2.7V
20
0
G
3.3 100
0.01
1.5
2.0
2.5
3.0
(V)
3.5
4.0
4.5
1
10
(mA)
100
0
10 20 30 40 50 60 70 80 90 100
(mA)
V
I
IN
OUT
I
OUT
EFFICIENCY vs. INPUT VOLTAGE
= 10mA
OUTPUT VOLTAGE vs. OUTPUT CURRENT
OUTPUT VOLTAGE vs. INPUT VOLTAGE
5.06
90
85
5.05
5.00
I
OUT
V
IN
= 3.3V
= 3.6V
V
5.04
5.02
5.00
IN
I
= 20mA
OUT
80
75
4.95
4.90
V
= 1.8V
= 2.0V
IN
V
IN
4.98
70
4.85
V
IN
= 2.4V, 2.7V
V
IN
= 3.0V
4.96
4.94
65
60
4.80
4.75
1
10
(mA)
100
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
(V)
1.5
2.0
2.5
3.0
(V)
3.5
4.0
I
V
IN
V
IN
OUT
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE (I
= 20mA)
OUT
2ms/div
2ms/div
TOP TRACE: OUTPUT CURRENT, 0mA to 25mA, 10mA/div
BOTTOM TRACE: OUTPUT VOLTAGE, 5mV/div, AC-COUPLED
R
= 250Ω, V = 5V, I = 20mA
OUT OUT
LOAD
TOP TRACE: V = 2V to 3V, 1V/div
IN
BOTTOM TRACE: OUTPUT VOLTAGE, 50mV/div, AC-COUPLED
________________________________________________________________________________________
3
Re g u la t e d 5 V Ch a rg e -P u m p
DC-DC Co n ve rt e r
the MAX619 s witc he s b e twe e n d oub le r a nd trip le r
_____________________P in De s c rip t io n
mode on alternating cycles, making a 2.5 x V charge
IN
pump. To further enhance efficiency over the input
PIN NAME
FUNCTION
Positive Terminal for C1
Input Supply Voltage
range, an internal comparator selects the higher of V
IN
1
2
C1+
IN
or V
to run the MAX619’s inte rna l c irc uitry.
OUT
Efficiency with V = 2V and I
= 20mA is typically
IN
OUT
80%.
+5V Output Voltage. V
= 0V when in
OUT
MAX619
3
OUT
Fig ure 1 s hows a d e ta ile d b loc k d ia g ra m of the
MAX619. In tripler mode, when the S1 switches close,
the S2 s witc he s op e n a nd c a p a c itors C1 a nd C2
shutdown mode.
4
5
6
7
8
C2+
C2-
Positive Terminal for C2
Negative Terminal for C2
charge up to V . On the second half of the cycle, C1
IN
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.
GND Ground
SHDN Active-High CMOS Logic-Level Shutdown Input
C1- Negative Terminal for C1
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.
_______________De t a ile d De s c rip t io n
Op e ra t in g P rin c ip le
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.
S h u t d o w n Mo d e
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
To maintain the greatest efficiency over the entire input
voltage range, the MAX619’s internal charge pump
V
OUT
falls to 0V. Connect SHDN to ground for normal
operation. When V = 3.6V, V typically reaches
operates as a voltage doubler when V ranges from
IN
OUT
IN
5V in 0.5ms under no-load conditions after SHDN goes
low.
3.0V to 3.6V, and as a voltage tripler when V ranges
IN
from 2.0V to 2.5V. When V ranges from 2.5V to 3.0V,
IN
4
________________________________________________________________________________________
Re g u la t e d 5 V Ch a rg e -P u m p
DC-DC Co n ve rt e r
MAX619
IN
C3
10µF
MAX619
P
IC
POWER
S1A
C2+
*
P
OUT
S2A
C4
C2
0.22µF
10µF
V /V
IN OUT
IN
S1B
C2-
FB
CONTROL
LOGIC
SWITCH
CONTROL
BUS
S2B
S2C
C1+
V
REF
S1C
S1D
C1
0.22µF
SHDN
SD
C1-
GND
SWITCHES SHOWN IN TRIPLER MODE, DISCHARGE CYCLE
*
Figure 1. Block Diagram
________________________________________________________________________________________
5
Re g u la t e d 5 V Ch a rg e -P u m p
DC-DC Co n ve rt e r
When using ceramic capacitors, the values of C3 and
__________Ap p lic a t io n s In fo rm a t io n
C4 can be reduced to 2µF and 1µF, respectively. If the
input supply source impedance is very low, C3 may not
be necessary.
Ca p a c it o r S e le c t io n
Charge-Pump Capacitors C1 and C2
The values of charge-pump capacitors C1 and C2 are
critical to ensure adequate output current and avoid
excessive peak currents. Use values in the range of
0.22µF to 1.0µF. Larger capacitors (up to 50µF) can
be used, but larger capacitors will increase output rip-
ple. Ceramic or tantalum capacitors are recommend-
ed.
Many capacitors exhibit 40% to 50% variation over
temperature. Compensate for capacitor temperature
c oe ffic ie nt b y s e le c ting a la rg e r nomina l va lue to
ensure proper operation over temperature. Table 1 lists
capacitor suppliers.
MAX619
Input and Output Capacitors, C3 and C4
The type of input bypass capacitor (C3) and output fil-
ter capacitor (C4) used is not critical, but it does affect
performance. Tantalums, ceramics, or aluminum elec-
trolytics are suggested. For smallest size, use Sprague
595D106X0010A2 surface-mount capacitors, which
measure 3.7mm x 1.8mm (0.146in x 0.072in). For low-
est ripple, use large, low effective-series-resistance
(ESR) ceramic or tantalum capacitors. For lowest cost,
use aluminum electrolytic or tantalum capacitors.
4
1
8
C1+
C2+
C2–
C1
0.22µF
C2
0.22µF
MAX619
5
7
3
C1–
IN
2
SHDN
OUT
6
5V ±4%
@ 20mA
2
GND
CELLS
Figure 2 shows the component values for proper oper-
ation using minimal board space. The input bypass
capacitor (C3) and output filter capacitor (C4) should
both be at least 10µF when using aluminum electrolyt-
ics or Sprague’s miniature 595D series of tantalum chip
capacitors.
C3
10µF
C4
10µF
Figure 2. Two-Cell to 5V Application Circuit
Table 1. Capacitor Suppliers
SUPPLIER
PHONE NUMBER
FAX NUMBER
CAPACITOR
CAPACITOR TYPE*
0.1µF ceramic (SM)
0.22µF ceramic (SM)
1.0µF ceramic (TH)
0.1µF ceramic (TH)
GRM42-6Z5U10M50
GRM42-6Z5U22M50
RPI123Z5U105M50V
RPE121Z5U104M50V
Murata Erie
(814) 237-1431
(814) 238-0490
Sprague Electric
(smallest size)
(603) 224-1961
(207) 327-4140
(603) 224-1430
(207) 324-7223
10µF tantalum (SM)
595D106X0010A2
* Note: (SM) denotes surface-mount component, (TH) denotes through-hole component.
6
________________________________________________________________________________________
Re g u la t e d 5 V Ch a rg e -P u m p
DC-DC Co n ve rt e r
MAX619
La yo u t Co n s id e ra t io n s
___________________Ch ip To p o g ra p h y
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.
C1-
C1+
P a ra lle lin g De vic e s
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
a mount of outp ut rip p le ob s e rve d will d e te rmine
whether single input bypass and output filter capacitors
can be used.
SHDN
IN
0.115”
(2.921mm)
OUT
C2+
GND
C2-
0.072”
(1.828mm)
TRANSISTOR COUNT: 599;
SUBSTRATE CONNECTED TO GND.
MAX619
OUT
IN
GND
INPUT
5V, 40mA
MAX619
GND
OUT
IN
Figure 3. Paralleling Two MAX619s
________________________________________________________________________________________
7
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