MAX662AESA+T [MAXIM]
Switched Capacitor Regulator, 500kHz Switching Freq-Max, CMOS, PDSO8, 0.150 INCH, PLASTIC, SOIC-8;
| 型号： | MAX662AESA+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Switched Capacitor Regulator, 500kHz Switching Freq-Max, CMOS, PDSO8, 0.150 INCH, PLASTIC, SOIC-8 闪存 存储 |
| 文件： | 总6页 (文件大小：77K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0253; Rev 1; 8/94
+1 2 V, 3 0 m A Fla s h Me m o ry
P ro g ra m m in g S u p p ly
MX62A
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
The MAX662A is a regulated +12V, 30mA-output, charge-
pump DC-DC converter. It provides the necessary +12V
±5% output to program byte-wide flash memories, and
requires no inductors to deliver a guaranteed 30mA out-
♦ Regulated +12V ±5% Output Voltage
♦ 4.5V to 5.5V Supply Voltage Range
2
♦ Fits in 0.1in
2
put from inputs as low as 4.75V. It fits into less than 0.1in
♦ Guaranteed 30mA Output
of boa rd spa c e . The MAX662A is a pin-c omp a tib le
upgrade to the MAX662, and is recommended for new
designs. The MAX662A offers lower quiescent and shut-
down currents, and guarantees the output current over all
temperature ranges.
♦ No Inductor—Uses Only 4 Capacitors
♦ 185µA Quiescent Current
♦ Logic-Controlled 0.5µA Shutdown
♦ 8-Pin Narrow SO and DIP Packages
The MAX662A is the first charge-pump boost converter to
provide a regulated +12V output. It requires only a few
inexpensive capacitors, and the entire circuit is complete-
ly surface-mountable.
______________Ord e rin g In fo rm a t io n
A logic-controlled shutdown pin that interfaces directly
with microprocessors reduces the supply current to only
0.5µA. The MAX662A comes in 8-pin narrow SO and DIP
packages.
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX662ACPA
MAX662ACSA
MAX662AC/D
MAX662AEPA
MAX662AESA
MAX662AMJA
0°C to +70°C
For higher-current flash memory programming solutions,
refer to the data sheets for the MAX734 (120mA output
current, guaranteed) and MAX732 (200mA output cur-
rent, guaranteed) PWM, switch-mode DC-DC converters.
Or, refer to the MAX761 data sheet for a 150mA, PFM
switch-mode DC-DC converter that operates from inputs
as low as 2V.
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
8 CERDIP**
*
Dice are tested at T = +25°C.
A
** Contact factory for availability and processing to MIL-STD-883.
________________________Ap p lic a t io n s
+12V Flash Memory Programming Supplies
Compact +12V Op-Amp Supplies
Switching MOSFETs in Low-Voltage Systems
Dual-Output +12V and +20V Supplies
__________Typ ic a l Op e ra t in g Circ u it
__________________P in Co n fig u ra t io n
INPUT
4.75V TO 5.5V
TOP VIEW
4.7µF
OUTPUT
12V ±5%
30mA
V
CC
C1-
C1+
C2-
SHDN
GND
1
2
3
4
8
7
6
5
V
SHDN
VOUT
C2-
pp
FLASH
MEMORY
MAX662A
MAX662A
C1+
V
OUT
0.22µF
0.22µF
4.7µF
V
CC
C2+
C1-
C2+
GND
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .
+1 2 V, 3 0 m A Fla s h Me m o ry
P ro g ra m m in g S u p p ly
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ................................................................-0.3V to 6V
Operating Temperature Ranges
SHDN..........................................................-0.3V to (V + 0.3V)
MAX662AC_A .....................................................0°C to +70°C
MAX662AE_A ..................................................-40°C to +85°C
MAX662AMJA................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
CC
I
Continuous..................................................................50mA
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
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.
MX62A
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 3a, V = 4.5V to 5.5V, T = T
to T , unless otherwise noted.)
MAX
CC
A
MIN
PARAMETER
SYMBOL
CONDITIONS
0mA ≤ I
MIN
TYP
MAX
UNITS
≤ 30mA,
OUT
11.4
12
12.6
V
= 4.75V to 5.5V
CC
MAX662AC/E
MAX662AM
0mA ≤ I
0mA ≤ I
≤ 20mA
≤ 24mA,
11.4
11.4
11.4
12
12
12
12.6
12.6
12.6
OUT
Output Voltage
V
OUT
V
OUT
= 4.75V to 5.5V
V
CC
0mA ≤ I
≤ 16mA
OUT
Supply Current
I
No load, V
No load, V
= 0V
185
0.5
500
76
1
500
10
µA
µA
kHz
%
CC
SHDN
Shutdown Current
Oscillator Frequency
Power Efficiency
= V
CC
SHDN
f
V
CC
= 5V, I
= 30mA
= 30mA
OSC
OUT
V
CC
= 5V, I
OUT
MAX662AC/E
MAX662AM
2
V
CC
= V
= 5V,
SHDN
V
CC
-to-V
Switch Impedance
R
SW
kΩ
V
OUT
I
= 30mA
1
2.5
OUT
V
V
2.4
-50
IH
Shutdown Input Threshold
SHDN Pin Current
0.4
-5
IL
V
CC
= 5V, V
= 0V
-15
0
SHDN
µA
V
CC
= V
= 5V
SHDN
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(Circuit of Figure 3a, T = +25°C, unless otherwise noted.)
A
SUPPLY CURRENT vs. SUPPLY VOLTAGE
OUTPUT VOLTAGE vs. OUTPUT CURRENT
EFFICIENCY vs. LOAD CURRENT
300
280
100
90
12.6
12.4
12.2
12.0
CONTINUOUS OUTPUT CURRENT MUST
NOT EXCEED 50mA ABS MAX LIMIT.
INTERMITTENT PEAK CURRENTS MAY
BE HIGHER.
T
A
= -55°C
260
240
V
CC
= 5.5V
80
70
60
50
40
220
200
180
160
140
120
100
11.8
11.6
V
CC
= 4.5V
T
= 0°C
V
CC
= 4.5V
A
V
= 4.75V
= 5.0V
CC
V
CC
= 4.75V
V
11.4
11.2
11.0
10.8
10.6
T
A
= +25°C
= 5.0V
V
CC
CC
V
CC
= 5.5V
CONTINUOUS OUTPUT CURRENT
MUST NOT EXCEED 50mA ABS MAX
LIMIT. INTERMITTENT PEAK
T
= +125°C
A
CURRENTS MAY BE HIGHER.
30
4.50
4.75
5.00
5.25
5.50
0
10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
2
_______________________________________________________________________________________
+1 2 V, 3 0 m A Fla s h Me m o ry
P ro g ra m m in g S u p p ly
MX62A
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(Circuit of Figure 3a, T = +25°C, unless otherwise noted.)
A
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
A
A
0mA
0V
0V
B
B
1ms/div
1ms/div
A: OUTPUT CURRENT, 20mA/div, I = 0mA to 30mA
A: SUPPLY VOLTAGE, 2V/div, V = 4.5V to 5.5V, I = 30mA
CC OUT
OUT
B: OUTPUT VOLTAGE RIPPLE, 100mV/div, V = 5.0V
B: OUTPUT VOLTAGE RIPPLE, 200mV/div
CC
_____________________P in De s c rip t io n
V
CC
C4
4.7µF
V
CC
PIN
NAME
FUNCTION
Negative terminal for the first charge-
pump capacitor
1
C1-
S1
S1
C3*
0.1µF
C2+
Positive terminal for the first charge-
pump capacitor
2
3
C1+
C2-
C2+
S2
0.22µF
+12V
V
OUT
C5
4.7µF
Negative terminal for the second
charge-pump capacitor
R2
R1
C2-
C1+
C1-
ERROR
AMP
Positive terminal for the second
charge-pump capacitor
4
5
6
7
S2
S2
VREF
V
CC
Supply Voltage
S1
S1
+12V Output Voltage. V
= V
CC
0.22µF
OUT
SHDN
V
OUT
when in shutdown mode.
GND
Ground
MAX662A
Active-high CMOS-logic level
Shutdown Input. SHDN is internally
OSCILLATOR
pulled up to V . Connect to GND for
CC
normal operation. In shutdown mode,
the charge pumps are turned off and
8
SHDN
GND
V
OUT
= V
.
CC
SWITCH CLOSURES SHOWN FOR CHARGE PUMP IN THE TRANSFER MODE
* C3 NOT REQUIRED. FOR MAX662 ONLY.
Figure 1. Block Diagram
_______________________________________________________________________________________
3
+1 2 V, 3 0 m A Fla s h Me m o ry
P ro g ra m m in g S u p p ly
S h u t d o w n Mo d e
The MAX662A enters shutdown mode when SHDN is a
logic high. SHDN is a TTL/CMOS-compatible input sig-
_______________De t a ile d De s c rip t io n
Op e ra t in g P rin c ip le
The MAX662A provides a regulated 12V output voltage
at 30mA from a 5V ±5% power supply, making it ideal
for flash EEPROM programming applications. It uses
internal charge pumps and external capacitors to gen-
erate +12V, eliminating inductors. Regulation is provid-
e d b y a p uls e -s kip p ing s c he me tha t monitors the
output voltage level and turns on the charge pumps
when the output voltage begins to droop.
nal that is internally pulled up to V . In shutdown
CC
mode, the charge-pump switching action is halted and
V
is connected to V
through a 1kΩ switch. When
IN
OUT
entering shutdown, V
declines to V
in typically
OUT
CC
13ms. Connect SHDN to ground for normal operation.
When V = 5V, it takes typically 400µs for the output
to reach 12V after SHDN goes low (Figure 2).
CC
MX62A
__________Ap p lic a t io n s In fo rm a t io n
Fig ure 1 s hows a s imp lifie d b loc k d ia g ra m of the
MAX662A. When the S1 switches are closed and the
S2 s witc he s a re op e n, c a p a c itors C1 a nd C2 a re
Co m p a t ib ilit y w it h MAX6 6 2
The MAX662A is a 100%-compatible upgrade of the
MAX662. The MAX662A does not require capacitor C3,
although its presence does not affect performance.
charged up to V . The S1 switches are then opened
CC
and the S2 switches are closed so that capacitors C1
a nd C2 a re c onne c te d in s e rie s b e twe e n V
a nd
CC
Ca p a c it o r S e le c t io n
V . This performs a voltage tripling function. A pulse-
OUT
skipping feedback scheme adjusts the output voltage
to 12V ±5%. The efficiency of the MAX662A with V
Charge-Pump Capacitors, C1 and C2
The capacitance values of the charge-pump capacitors
C1 and C2 are critical. Use ceramic or tantalum capaci-
tors in the 0.22µF to 1.0µF range. For applications requir-
ing operation over extended and/or military temperature
ranges, use 1.0µF tantalum capacitors for C1 and C2
(Figure 3b).
=
CC
5V a nd I
= 30mA is typ ic a lly 76%. Se e the
OUT
Effic ie nc y vs . Loa d Curre nt g ra p h in the Typ ic a l
Operating Characteristics.
During one oscillator cycle, energy is transferred from
the charge-pump capacitors to the output filter capaci-
tor and the load. The number of cycles within a given
time frame increases as the load current increases or
as the input supply voltage decreases. In the limiting
case, the charge pumps operate continuously, and the
oscillator frequency is nominally 500kHz.
Input and Output Capacitors, C4 and C5
The type of input bypass capacitor (C4) and output filter
capacitor (C5) affects performance. Tantalums, ceramics
or aluminum electrolytics are suggested. For smallest size,
use Sprague 595D475X9016A7 surface-mount capacitors,
which are 3.51mm x 1.81mm. For lowest ripple, use low-
ESR through-hole ceramic or tantalum capacitors. For low-
est cost, use aluminum electrolytic or tantalum capacitors.
Figure 3a shows the component values for proper opera-
tion over the commercial temperature range using mini-
mum board space. The input bypass capacitor (C4) and
output filter capacitor (C5) should both be at least 4.7µF
when using Sprague’s miniature 595D series of tantalum
chip capacitors. Figure 3b shows the suggested compo-
nent values for applications over extended and/or mili-
tary temperature ranges.
5V
SHDN
0V
12V
V
OUT
The values of C4 and C5 can be reduced to 2µF and
1µF, respectively, when using ceramic capacitors. If
using aluminum electrolytics, choose capacitance values
5V
of 10µF or la rg e r for C4 a nd C5. Note tha t a s V
CC
200µs/div
CIRCUIT OF FIGURE 3, V = 5V, I = 200µA
increases above 5V and the output current decreases,
the amount of ripple at V increases due to the slower
OUT
CC
OUT
oscillator frequency combined with the higher input volt-
age. Increase the input and output bypass capacitance
to reduce output ripple.
Figure 2. MAX662A Exiting Shutdown
Table 1 lists various capacitor suppliers.
4
_______________________________________________________________________________________
+1 2 V, 3 0 m A Fla s h Me m o ry
P ro g ra m m in g S u p p ly
MX62A
Table 1. Capacitor Suppliers
Supplier
Phone Number
Fax Number
Capacitor
Capacitor Type*
0.22µF Ceramic (SM)
1.0µF Ceramic (TH)
4.7µF Tantalum (SM)
1.0µF Tantalum (SM)
GRM42-6Z5U224M50
RPE123Z5U105M50V
595D475X9016A7
595D105X9016A7
Murata Erie
(814) 237-1431
(814) 238-0490
(603) 224-1961
(207) 324-4140
(603) 224-1430
(207) 324-7223
Sprague Electric
*Note: (SM) denotes surface-mount component, (TH) denotes through-hole component.
La yo u t Co n s id e ra t io n s
Layout is critical, due to the MAX662A’s high oscillator
frequency. Good layout ensures stability and helps
maintain the output voltage under heavy loads. For best
performance, use very short connections to the capaci-
tors. The order of importance is: C4, C5, C1, C2.
2
3
C2-
C1+
C2
0.22µF
C1
0.22µF
MAX662A
1
8
4
5
C2+
C1-
Fla s h EEP ROM Ap p lic a t io n s
The circuit of Figure 3a is a +12V ±5% 30mA flash
EEPROM programming power supply. A microproces-
sor controls the programming voltage via the SHDN
pin. When SHDN is low, the output voltage (which is
V
IN
4.75V TO 5.5V
V
CC
PROGRAMMING
CONTROL
DIRECT FROM
µP
SHDN
C4
4.7µF
V
OUT
+12V ±5%
AT 30mA
7
6
V
OUT
GND
C5
4.7µF
connected to the flash memory V supply-voltage pin)
PP
rises to +12V to facilitate programming the flash memo-
ry. When SHDN is high, the output voltage is connected
to V through an internal 1kΩ resistor.
IN
Figure 3a. Flash EEPROM Programming Power Supply for
Commercial Temperature Range Applications
P a ra lle lin g De vic e s
Two MAX662As can be placed in parallel to increase
output drive capability. The V , V , and GND pins
CC OUT
can be paralleled, reducing pin count. Use a single
bypass capacitor and a single output filter capacitor
with twice the capacitance value if the two devices can
be placed close to each other. If the MAX662As cannot
be placed close together, use separate bypass and
outp ut c a p a c itors . The a mount of outp ut rip p le
observed will determine whether single input bypass
and output filter capacitors can be used. Under certain
conditions, one device may supply the total output cur-
rent. Therefore, regardless of the number of devices in
parallel, the maximum continuous current must not
exceed 50mA.
2
3
C2-
C1+
*C2
1.0µF
*C1
1.0µF
MAX662A
1
8
4
5
C2+
C1-
V
IN
4.75V TO 5.5V
V
CC
PROGRAMMING
CONTROL
DIRECT FROM
µP
SHDN
*C4
22µF
7
6
V
OUT
V
OUT
GND
+12V ±5%
AT 30mA
*C5
22µF
1 2 V a n d 2 0 V Du a l-Ou t p u t P o w e r S u p p ly
Us ing the c ha rg e -p ump volta g e -d oub le r c irc uit of
Figure 4, the MAX662A can produce a +20V supply
from a single +5V supply. Figure 5 shows the current
capability of the +20V supply.
*SPRAGUE 595D SERIES OR EQUIVALENT
Figure 3b. Flash EEPROM Programming Power Supply for
Extended and/or Military Temperature Range Applications
_______________________________________________________________________________________
5
+1 2 V, 3 0 m A Fla s h Me m o ry
P ro g ra m m in g S u p p ly
20.0
19.2
18.4
17.6
16.8
16.0
CIRCUIT OF FIGURE 4
V
T
A
= 4.75V
= +25°C
2
1
3
4
CC
C2-
C1+
C1-
0.22µF
0.22µF
MAX662A
WITH +12V OUTPUT
UNLOADED
C2+
8
7
1µF
SHDN
GND
WITH 34mA LOAD
ON +12V OUTPUT
MX62A
12V
V
5V ±5%
=
IN
1N5818 OUTPUT
5
6
20V
OUTPUT
V
OUT
V
CC
1N5818
1µF
1µF
2µF
0
5
10 15 20 25 30 35 40
20V OUTPUT CURRENT (mA)
Figure 4. +12V and +20V Dual Supply from a +5V Input
Figure 5. +20V Supply Output Current Capability
___________________Ch ip To p o g ra p h y
C2- C1+
C2+
0. 086"
(2. 184mm)
C1-
V
CC
SHDN
V
OUT
GND
0. 086"
(2. 184mm)
TRANSISTOR COUNT: 225
SUBSTRATE CONNECTED TO V
OUT
6
_______________________________________________________________________________________
相关型号：
MAX662AESA-T
Switched Capacitor Regulator, 500kHz Switching Freq-Max, CMOS, PDSO8, 0.150 INCH, PLASTIC, SOIC-8
MAXIM
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