Rainbow Electronics MAX662A User Manual

19-0253; Rev 1; 8/94

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

+12V, 30mA Flash Memory

Programming Supply

_______________General Description

The MAX662A is a regulated +12V, 30mA-output, charge­pump 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 out­put from inputs as low as 4.75V. It fits into less than 0.1in
of board space. The MAX662A is a pin-compatible
upgrade to the MAX662, and is recommended for new
designs. The MAX662A offers lower quiescent and shut­down currents, and guarantees the output current over all
temperature ranges.

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 complete­ly surface-mountable.

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.

For higher-current flash memory programming solutions,
refer to the data sheets for the MAX734 (120mA output
current, guaranteed) and MAX732 (200mA output cur­rent, 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.

________________________Applications

+12V Flash Memory Programming Supplies
Compact +12V Op-Amp Supplies
Switching MOSFETs in Low-Voltage Systems
Dual-Output +12V and +20V Supplies

____________________________Features

♦ Regulated +12V ±5% Output Voltage
♦ 4.5V to 5.5V Supply Voltage Range
♦ Fits in 0.1in

2

2

♦ Guaranteed 30mA Output
♦ No Inductor—Uses Only 4 Capacitors
♦ 185µA Quiescent Current
♦ Logic-Controlled 0.5µA Shutdown
♦ 8-Pin Narrow SO and DIP Packages

______________Ordering Information

PART

MAX662ACPA
MAX662ACSA
MAX662AC/D 0°C to +70°C
MAX662AEPA -40°C to +85°C 8 Plastic DIP
MAX662AESA -40°C to +85°C 8 SO
MAX662AMJA -55°C to +125°C 8 CERDIP**

* Dice are tested at TA= +25°C.
** Contact factory for availability and processing to MIL-STD-883.

TEMP. RANGE PIN-PACKAGE

0°C to +70°C
0°C to +70°C

8 Plastic DIP
8 SO
Dice*

MAX662A

__________Typical Operating Circuit

INPUT

4.75V TO 5.5V

4.7µF
V

CC

SHDN

0.22µF 0.22µF

C1+

C1-

V

OUT

MAX662A

C2-

C2+

GND

________________________________________________________________

OUTPUT

12V ±5%

30mA

4.7µF

V

pp

FLASH

MEMORY

__________________Pin Configuration

TOP VIEW

C1-

1

C1+

2
C2­C2+

MAX662A

3

4

DIP/SO

Maxim Integrated Products

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

SHDN

8

GND

7

V

OUT

6

V

5

CC

1

+12V, 30mA Flash Memory
Programming Supply

ABSOLUTE MAXIMUM RATINGS

VCCto GND ................................................................-0.3V to 6V

SHDN..........................................................-0.3V to (V

Continuous..................................................................50mA

I

OUT

Continuous Power Dissipation (T

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

= +70°C)

A

CC

+ 0.3V)

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

MAX662A

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

(Circuit of Figure 3a, VCC= 4.5V to 5.5V, TA= T

Output Voltage

Supply Current

Oscillator Frequency

VCC-to-V

Switch Impedance

OUT

Shutdown Input Threshold

V

OUT

CC

OSC

R

SW

IH
IL

SHDN Pin Current

to T

MIN

MAX

MAX662AC/E

MAX662AM

No load, V
No load, V

SHDN
SHDN

VCC= 5V, I
VCC= 5V, I
VCC= V

SHDN

I

= 30mA

OUT

VCC= 5V, V
VCC= V

SHDN

, unless otherwise noted.)

OUT
OUT

SHDN

__________________________________________Typical Operating Characteristics

(Circuit of Figure 3a, TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. SUPPLY VOLTAGE

300
280

TA = -55°C

260
240

220
200
180
160

SUPPLY CURRENT (µA)

140
120
100

TA = 0°C



4.50 5.25



TA = +25°C

4.75

5.00

SUPPLY VOLTAGE (V)

TA = +125°C

MAX662A-01

OUTPUT VOLTAGE (V)

5.50

OUTPUT VOLTAGE vs. OUTPUT CURRENT

12.6
CONTINUOUS OUTPUT CURRENT MUST 

12.4

NOT EXCEED 50mA ABS MAX LIMIT. 
INTERMITTENT PEAK CURRENTS MAY 

12.2
BE HIGHER.

12.0

11.8

VCC = 4.5V

11.6

VCC = 4.75V

11.4

11.2

11.0

10.8

10.6

VCC = 5.0V

VCC = 5.5V

0 20 60 100

10 30 50 70 90

Operating Temperature Ranges

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

CONDITIONS

0mA ≤ I
VCC= 4.75V to 5.5V

0mA ≤ I
0mA ≤ I

VCC= 4.75V to 5.5V
0mA ≤ I

OUT

OUT
OUT

OUT

≤ 30mA,

≤ 20mA
≤ 24mA,

≤ 16mA

11.4 12 12.6

11.4 12 12.6

11.4 12 12.6

11.4 12 12.6

= 0V
= V

CC

= 30mA
= 30mA

= 5V,

MAX662AC/E

12

MAX662AM 1 2.5

2.4V

= 0V

= 5V



MAX662A-02

40 80

OUTPUT CURRENT (mA)

-50 -15 -5
0

EFFICIENCY vs. LOAD CURRENT

100

90

80

70

60

EFFICIENCY (%)

50

40

30

VCC = 5.5V

VCC = 4.5V

VCC = 4.75V

CONTINUOUS OUTPUT CURRENT
MUST NOT EXCEED 50mA ABS MAX
LIMIT. INTERMITTENT PEAK
CURRENTS MAY BE HIGHER.

10 30 50 70 90

0 20 60 100

40 80

LOAD CURRENT (mA)

UNITSMIN TYP MAXSYMBOLPARAMETER

0.4V



VCC = 5.0V

V

µA185 500I
µA0.5 10Shutdown Current

kHz500f

%76Power Efficiency

kΩ

V

µA

MAX662A-03

2 _______________________________________________________________________________________