MAXIM AX1044, ICL7660 User Manual

查询ICL7660供应商

19-4667; Rev 1; 7/94

Switched-Capacitor Voltage Converters

_______________General Description

The MAX1044 and ICL7660 are monolithic, CMOS
switched-capacitor voltage converters that invert, dou­ble, divide, or multiply a positive input voltage. They are
pin compatible with the industry-standard ICL7660 and
LTC1044. Operation is guaranteed from 1.5V to 10V with
no external diode over the full temperature range. They
deliver 10mA with a 0.5V output drop. The MAX1044
has a BOOST pin that raises the oscillator frequency
above the audio band and reduces external capacitor
size requirements.

The MAX1044/ICL7660 combine low quiescent current
and high efficiency. Oscillator control circuitry and four
power MOSFET switches are included on-chip.
Applications include generating a -5V supply from a
+5V logic supply to power analog circuitry. For applica­tions requiring more power, the MAX660 delivers up to
100mA with a voltage drop of less than 0.65V.

________________________Applications

-5V Supply from +5V Logic Supply
Personal Communications Equipment
Portable Telephones
Op-Amp Power Supplies
EIA/TIA-232E and EIA/TIA-562 Power Supplies
Data-Acquisition Systems
Hand-Held Instruments
Panel Meters

__________Typical Operating Circuit

____________________________Features

♦ Miniature µMAX Package
♦ 1.5V to 10.0V Operating Supply Voltage Range
♦ 98% Typical Power-Conversion Efficiency
♦ Invert, Double, Divide, or Multiply Input Voltages
♦ BOOST Pin Increases Switching Frequencies

(MAX1044)

♦ No-Load Supply Current: 200µA Max at 5V
♦ No External Diode Required for Higher-Voltage

Operation

______________Ordering Information

PART

MAX1044CPA

MAX1044CSA

Ordering Information continued at end of data sheet.

* Contact factory for dice specifications.

0°C to +70°C
0°C to +70°C
0°C to +70°CMAX1044C/D

PIN-PACKAGETEMP. RANGE

8 Plastic DIP
8 SO
Dice*
8 Plastic DIP-40°C to +85°CMAX1044EPA

_________________Pin Configurations

TOP VIEW

(N.C.) BOOST

CAP+

GND

CAP-

1

2

MAX1044

3

4

ICL7660

8

V+

7

OSC

6

LV

5

V

OUT

MAX1044/ICL7660

N.C.

2

GND

DIP/SO/µMAX

V+ AND CASE

1

3

Maxim Integrated Products

CAP+

MAX1044

ICL7660

CAP-

GND

NEGATIVE VOLTAGE CONVERTER

________________________________________________________________

V+

V

OUT

INPUT
SUPPLY
VOLTAGE

NEGATIVE
OUTPUT
VOLTAGE

CAP+

( ) ARE FOR ICL7660

Call toll free 1-800-998-8800 for free samples or literature.

8

ICL7660

4

CAP-

TO-99

OSC

7

LV

6

V

OUT

5

1

Switched-Capacitor Voltage Converters

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (V+ to GND, or GND to V

Input Voltage on Pins 1, 6, and 7.........-0.3V ≤ V

LV Input Current ..................................................................20µA

Output Short-Circuit Duration (V+ ≤ 5.5V)..................Continuous

Continuous Power Dissipation (T

Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW

SO (derate 5.88mW/°C above +70°C).........................471mW

µMAX (derate 4.1mW/°C above +70°C) ......................330mW

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.

= +70°C)

A

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, V+ = 5.0V, LV pin = 0V, BOOST pin = open, I

PARAMETER

MAX1044/ICL7660

RL= ∞,
pins 1 and 7

Supply Current

Supply Voltage
Range (Note 1)

Output Resistance

Oscillator Frequency

Oscillator Sink or
Source Current

Oscillator Impedance

Note 1: The Maxim ICL7660 and MAX1044 can operate without an external output diode over the full temperature and voltage

ranges. The Maxim ICL7660 can also be used with an external output diode in series with pin 5 (cathode at V
replacing the Intersil ICL7660. Tests are performed without diode in circuit.

Note 2: f

is tested with C

OSC

ed to this 100pF test point, and is intended to simulate pin 7’s capacitance when the device is plugged into a test socket
with no external capacitor. For this test, the LV pin is connected to GND for comparison to the original manufacturer’s
device, which automatically connects this pin to GND for (V+ > 3V).

no connection,
LV open

RL= ∞, pins 1 and 7 = V+ = 3V
RL= 10kΩ, LV open
RL= 10kΩ, LV to GND

IL= 20mA,
f

OSC

LV open

f

OSC

f

OSC

V+ = 2V, IL = 3mA,
LV to GND

C

OSC

LV to GND (Note 2)
RL= 5kΩ, TA= +25°C, f

RL= ∞, TA = +25°C, LV open 99.0 99.9 %97.0 99.9Voltage Conversion Efficiency
V

OSC

TA= +25°C

= 100pF to minimize the effects of test fixture capacitance loading. The 1pF frequency is correlat-

OSC

)....................10.5V

OUT

≤ (V+ + 0.3V)

IN

CONDITIONS

= 5kHz,

= 2.7kHz (ICL7660),
= 1kHz (MAX1044),

= 1pF,

= 0V or V+, LV open

CERDIP (derate 8.00mW/°C above +70°C).................640mW

TO-99 (derate 6.67mW/°C above +70°C)....................533mW

Operating Temperature Ranges

MAX1044C_ _ /ICL7660C_ _ ..............................0°C to +70°C

MAX1044E_ _ /ICL7660E_ _............................-40°C to +85°C

MAX1044M_ _ /ICL7660M_ _ ........................-55°C to +125°C

Storage Temperature Range............................-65°C to + 150°C

Lead Temperature (soldering, 10sec).............................+300°C

= 0mA, TA= T

LOAD

TA= +25°C
TA= 0°C to +70°C
TA= -40°C to +85°C
TA= -55°C to +125°C

TA= +25°C
TA= 0°C to +70°C
TA= -40°C to +85°C
TA= -55°C to +125°C
TA= +25°C
TA= 0°C to +70°C
TA= -40°C to +85°C
TA= -55°C to +125°C
V+ = 5V
V+ = 2V

5kHz, LV open

OSC

Pin 1 = 0V
Pin 1 = V+
V+ = 2V
V+ = 5V

to T

MIN

MIN TYP MAX

, unless otherwise noted.)

MAX

MAX1044

30 200

10

1.5 10
65 100

5
1

100

200
200
200

130
130
150
325
325
325
400

3

20

ICL7660

MIN TYP MAX

80 175

225
250
250

3.0 10.0

1.5 3.5
55 100

120
140
150
250
300
300
400

10

95 98

1.0

100

OUT

) when

UNITS

µA

V

Ω

kHz

%95 98Power Efficiency

µA

MΩ1.0

kΩ

2 _______________________________________________________________________________________

Switched-Capacitor Voltage Converters

__________________________________________Typical Operating Characteristics

(V+ = 5V; C

OUTPUT VOLTAGE and OUTPUT RIPPLE

-2.0

-1.5
A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with

-1.0
BOOST = OPEN



OUTPUT VOLTAGE (V)

-0.5

0

012345678910

EFFICIENCY and SUPPLY CURRENT

100

90

EFFICIENCY

80



70
60
50
40

EFFICIENCY (%)

30
20
10

0

012345678910

= 0.1µF; C1 = C2 = 10µF; LV = open; OSC = open; TA= +25°C; unless otherwise noted.)

BYPASS

vs. LOAD CURRENT

OUTPUT
VOLTAGE

C

B

A

OUTPUT RIPPLE

LOAD CURRENT (mA)

vs. LOAD CURRENT

SUPPLY CURRENT


LOAD CURRENT (mA)

V+ = 2V
LV = GND

V+ = 2V
LV = GND

400
350

MAX1044-Fig 1

300
250
200
150
100
50
0

10
9

MAX1044-Fig 4

8
7
6

5
4
3

2
1

0

OUTPUT VOLTAGE and OUTPUT RIPPLE

-5.0

-4.5

-4.0

-3.5

-3.0

-2.5

-2.0

-1.5

OUTPUT VOLTAGE (V)

OUTPUT RIPPLE (mVp-p)

-1.0

-0.5

100

90
80
70
60
50
40

EFFICIENCY (%)

30

SUPPLY CURRENT (mA)

20
10

vs. LOAD CURRENT

OUTPUT VOLTAGE

A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with
BOOST = OPEN


0

0 5 10 15 20 25 30 35 40

EFFICIENCY and SUPPLY CURRENT

A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with
BOOST = OPEN


0

0 5 10 15 20 25 30 35 40

B

A

LOAD CURRENT (mA)

vs. LOAD CURRENT

EFFICIENCY


LOAD CURRENT (mA)

C

A

B

V+ = 5V
LV = OPEN

OUTPUT RIPPLE

A

C

SUPPLY CURRENT


V+ = 5V
LV = OPEN

800
720

MAX1044-Fig 2

640
560
480
400

C

320
240

OUTPUT RIPPLE (mVp-p)

160
80
0

50
45

MAX1044-Fig 5

B

40
35
30

25
20
15

SUPPLY CURRENT (mA)

10
5

0

OUTPUT VOLTAGE and OUTPUT RIPPLE

-10

-9

-8

-7

-6

-5

-4

-3

OUTPUT VOLTAGE (V)

-2

-1

100

90
80
70
60
50
40

EFFICIENCY (%)

30
20
10

vs. LOAD CURRENT

C

A

V+ = 10V
LV = OPEN

SUPPLY CURRENT


OUTPUT
VOLTAGE

A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with
BOOST = OPEN

OUTPUT
RIPPLE

B

0

0

A

0 5 10 15 20 25 30 35 40

LOAD CURRENT (mA)

EFFICIENCY and SUPPLY CURRENT

vs. LOAD CURRENT

B, C

A

EFFICIENCY

A: MAX1044 with
BOOST = V+
B: ICL7660
C: MAX1044 with
BOOST = OPEN


0 5 10 15 20 25 30 35 40

LOAD CURRENT (mA)

B

C

V+ = 10V
LV = OPEN

700
630

MAX1044-Fig 3

560
490
420
350
280
210
140
70
0

50
45

MAX1044-Fig 6

40
35
30

25
20
15

10
5

0

MAX1044/ICL7660

OUTPUT RIPPLE (mVp-p)

SUPPLY CURRENT (mA)

vs. OSCILLATOR FREQUENCY

100

90

80

70

C1, C2 = 100µF

60

EFFICIENCY (%)

50

40

30

1

10

10

OSCILLATOR FREQUENCY (Hz)

EFFICIENCY

C1, C2 = 10µF

2103

C1, C2 = 1µF

EXTERNAL
HCMOS
OSCILLATOR

4

10

100,000

MAX1044-Fig 7

10,000

1000

OSCILLATOR FREQUENCY (Hz)

5

5

6x10

10

OSCILLATOR FREQUENCY

vs. EXTERNAL CAPACITANCE

ICL7660 and

100

MAX1044 with
BOOST = OPEN

10

1

0.1
1

10 100 100,000

C

MAX1044 with
BOOST -V+

1000

(pF)

OSC

10,000

100,000

MAX1044-Fig 8

10,000

1000

OSCILLATOR FREQUENCY (Hz)

100

OSCILLATOR FREQUENCY

vs. SUPPLY VOLTAGE

FROM TOP TO BOTTOM AT 5V
MAX1044, BOOST = V+, LV = GND
MAX1044, BOOST = V+, LV = OPEN
ICL7660, LV = GND
ICL7660, LV = OPEN
MAX1044, BOOST = OPEN, LV = GND
MAX1044, BOOST = OPEN, LV = OPEN

23 678910

1

5

4

SUPPLY VOLTAGE (V)

_______________________________________________________________________________________

MAX1044-Fig 9

3

Switched-Capacitor Voltage Converters

____________________________Typical Operating Characteristics (continued)

(V+ = 5V; C

= 0.1µF; C1 = C2 = 10µF; LV = open; OSC = open; TA= +25°C; unless otherwise noted.)

BYPASS

OSCILLATOR FREQUENCY

100

80

60

40

20

OSCILLATOR FREQUENCY (kHz)

MAX1044/ICL7660

0

2000
1000

100

10

1

QUIESCENT CURRENT (µA)

0.1

vs. TEMPERATURE

A: MAX1044 with
BOOST = V+
B: ICL7600

A

B

C

-50

-25 0 75 100 125

QUIESCENT CURRENT
vs. SUPPLY VOLTAGE

A: MAX1044, BOOST = V+, LV = GND
B: MAX1044, BOOST = V+, LV = OPEN
C: ICL7660 and MAX1044 with

BOOST = OPEN, LV = GND;

ABOVE 5V, MAX1044 ONLY
D: ICL7660 and MAX1044 with

BOOST = OPEN, LV = OPEN

12345678910

C: MAX1044 with
BOOST = OPEN

25

50

TEMPERATURE (°C)

A
B

C

D

SUPPLY VOLTAGE (V)

MAX1044-Fig 10

MAX1044-Fig 12

QUIESCENT CURRENT

vs. OSCILLATOR FREQUENCY

10,000

1000

USING

100

EXTERNAL
CAPACITOR

10

QUIESCENT CURRENT (µA)

1

0101102103104105

10

500
400

300

200

100

QUIESCENT CURRENT (µA)

0

-50 -25 0 25 50 75 100 125



OSCILLATOR FREQUENCY (Hz)

QUIESCENT CURRENT

vs. TEMPERATURE

ICL7660, MAX1044 with BOOST = OPEN

TEMPERATURE (°C)

USING
EXTERNAL
HCMOS
OSCILLATOR

MAX1044 with
BOOST = V+

5x10

MAX1044-Fig 11

5

MAX1044-Fig 13

OUTPUT RESISTANCE

vs. OSCILLATOR FREQUENCY

1000

900
800
700
600
500
400

RESISTANCE (Ω)

300

C1, C2 = 100µF

200
100

0

1

10

10210310410

FREQUENCY (Hz)

C1, C2 = 10µF

EXTERNAL
HCMOS
OSCILLATOR

C1, C2 = 1µF

5

MAX1044-Fig 14

200
180
160
140
120
100

80
60

OUTPUT RESISTANCE (Ω)

40
20

OUTPUT RESISTANCE
vs. SUPPLY VOLTAGE

0

12345678910

SUPPLY VOLTAGE (V)

MAX1044-Fig 15

OUTPUT RESISTANCE

80

70

60

50

40

OUTPUT RESISTANCE (Ω)

30

20

vs. TEMPERATURE

ICL7660,
MAX1044 with
BOOST = OPEN

-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)

4 _______________________________________________________________________________________

MAX1044 with
BOOST = V+

MAX1044-Fig 16