Rainbow Electronics MAX1697 User Manual

General Description

The MAX1697 ultra-small, monolithic, CMOS charge­pump voltage inverter accepts an input voltage ranging
from +1.25V to +5.5V. This device features an ultra-low
12Ω output resistance, permitting loads of up to 60mA
with maximum efficiency. The MAX1697 is available
with operating frequencies of 12kHz, 35kHz, 125kHz, or
250kHz, allowing optimization of supply current or
external component size. Its small external components
and micropower shutdown mode make this device
ideal for both battery-powered and board-level voltage
conversion applications.

Oscillator control circuitry and four power MOSFET
switches are included on-chip. Applications include
generating a negative supply from a +5V or +3.3V logic
supply to power analog circuitry. All versions come in a
6-pin SOT23 package and deliver 60mA.

For applications with lower current requirements, the
MAX1719/MAX1720/MAX1721 are pin-compatible
SOT23 charge pumps that supply up to 25mA.

Applications

Negative Supply from +5V or +3.3V Logic Supplies

Small LCD Panels

GaAsFET Bias Supplies

Handy-Terminals, PDAs

Battery-Operated Equipment

Features

♦ 60mA Output Current
♦ Low 12Ω Output Resistance
♦ 150µA Supply Current (MAX1697R)
♦ Requires Only Two 1µF Capacitors (MAX1697U)
♦ Start-Up Current Limited
♦ +1.25V to +5.5V Input Voltage Range
♦ 0.1µA Logic-Controlled Shutdown
♦ Slew-Rate Limited to Reduce EMI
♦ 6-Pin SOT23 Package

MAX1697

60mA, SOT23 Inverting Charge Pump

with Shutdown

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

C1+ C1-

IN

SHDN

OUT

GND

ON

1µF

1µF

OFF

INPUT

1.5V to 5.5V

NEGATIVE
OUTPUT

-1

✕

V

IN

60mA

MAX1697U

Typical Operating Circuit

19-1499; Rev 1; 11/00

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

PART NO.

SUFFIX

R 12

FREQUENCY

(kHz)

TOP

MARK

AABV

S 35 AABW

T

U 250 AABY

125 AABX

Note 1: The MAX1697 requires special solder temperature
profile described in the Absolute Maximum Ratings section.

Note 2: The MAX1697 is available with four different operating
frequencies. Choose the desired frequency from the table
below and insert the suffix in the blank above to complete the
part number.

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1697_EUT-T

-40°C to +85°C

6 SOT23-6

TOP VIEW

OUT

IN

C1-

1

2

3

MAX1697

SOT23-6

C1+

6

SHDN

5

GND

4

MAX1697

60mA, SOT23 Inverting Charge Pump
with Shutdown

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, capacitors from Table 2, VIN= +5V, SHDN = IN, TA= 0°C to +85°C, unless otherwise noted. Typical values are at
T

A

= +25°C.)

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.

IN to GND .................................................................-0.3V to +6V

C1+, SHDN to GND.....................................-0.3V to (V

IN

+ 0.3V)

C1- to GND..............................................(V

OUT

- 0.3V) to + 0.3V

OUT to GND .............................................................+0.3V to -6V

OUT Output Current............................................................90mA

OUT Short-Circuit to GND .............................................Indefinite

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23 (derate 14mW/°C above +70°C) (Note 3)...1.1W

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

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

Lead Temperature ..........................................................(Note 4)

MAX1697T/U, RL= 5kΩ

SHDN = GND or IN

V

IN(MIN)

≤ VIN≤ 2.5V

MAX1697R/S, RL= 5kΩ

2.5V ≤ VIN≤ 5.5V

V

IN(MIN)

≤ VIN≤ 2.5V

2.5V ≤ VIN≤ 5.5V

I

OUT

= 0, TA= +25°C

SHDN = GND, OUT is internally pulled to GND
in shutdown

TA= +25°C

TA= +25°C

SHDN = GND

I

OUT

= 60mA

CONDITIONS

10

nA

-100 0.05 +100

SHDN Bias Current

0.2

V

0.6

SHDN Input Logic Low

VIN- 0.2

V

2.0

SHDN Input Logic High

Ω38

OUT to GND Shutdown
Resistance

33

Ω

12 25

Output Resistance (Note 5)

1.4 5.5

1.5 5.5
V

1.25 5.5

Supply Voltage Range

%99 99.9Voltage Conversion Efficiency

20 35 50

kHzOscillator Frequency

0.03

1.5 5.5

µA

150 300

Quiescent Supply Current

350 650

µA

0.002 1

Shutdown Supply Current

UNITSMIN TYP MAXPARAMETER

TA= 0°C to +85°C

TA= +25°C

TA= 0°C to +85°C

TA= +25°C

MAX1697S

MAX1697R

TA= +85°C

TA= +25°C

TA= 0°C to +85°C

TA= +25°C

TA= +85°C

TA= +25°C

MAX1697U

MAX1697T 950 1700

1800 3400

Output shorted to ground, TA= +25°C mA170Short-Circuit Current

71217

140 250 360

70 125 180

MAX1697R

MAX1697S

MAX1697T

MAX1697U

Note 3: Thermal properties are specified with product mounted on the PC board with one square-inch of copper area and still air.
Note 4: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the

device can be exposed to during board level solder attach and rework. Maxim recommends the use of the solder profiles
recommended in the industry standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection
reflow processes. Preheating, per this standard, is required. Hand or wave soldering is not recommended.

MAX1697

60mA, SOT23 Inverting Charge Pump

with Shutdown

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, capacitors from Table 2, VIN= +5V, SHDN = IN, TA= -40°C to +85°C, unless otherwise noted.) (Note 6)

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1, capacitors from Table 2, VIN= +5V, SHDN = IN, TA= 0°C to +85°C, unless otherwise noted. Typical values are at
T

A

= +25°C.)

CONDITIONS

150

UNITSMIN TYP MAXPARAMETER

Note 5: Output resistance is guaranteed with capacitor ESR of 0.3Ω or less.
Note 6: All specifications from -40°C to +85°C are guaranteed by design, not production tested.

Trip Temperature °C

Hysteresis °C15

Temperature increasing

THERMAL SHUTDOWN

VRL= 5kΩSupply Voltage Range

1.6 5.5

MAX1697R

V

IN(MIN)

≤ VIN≤ 2.5V

2.5V ≤ VIN≤ 5.5V

V

IN(MIN)

≤ VIN≤ 2.5V

2.5V ≤ VIN≤ 5.5V

MAX1697T/U

1.5 5.5

µA

SHDN = GND, OUT is internally pulled to GND in
shutdown

350

Continuous, long-term

Quiescent Current

750

MAX1697T

MAX1697R

I

OUT

= 60mA

CONDITIONS

1800

kHz

621

3600

MAX1697S

MAX1697U

Oscillator Frequency

16 60

MAX1697T 60 200

120 400

MAX1697S

MAX1697U

MAX1697R/S

0.2

V

0.6

SHDN Input Logic Low

VIN- 0.2

V

2.1

SHDN Input Logic High

Ω8

OUT to GND Shutdown
Resistance

33 ΩOutput Resistance (Note 5)

mA

RMS

60Output Current

UNITSMIN MAXPARAMETER

µsI

OUT

= 15mAWake-Up Time from Shutdown

70MAX1697U

600

100

1200MAX1697R

MAX1697S

MAX1697T

0

10

15

25

20

30

1.5 2.5 3.02.0 3.5 4.0 4.5 5.0 5.5

MAX1697R/S/T/U

OUTPUT IMPEDANCE vs. INPUT VOLTAGE

MAX1697 TOC09

INPUT VOLTAGE (V)

OUTPUT IMPEDANCE (Ω)

5

0

20

10

40

30

60

50

70

90

80

100

0203010 40 50 60 70 80

MAX1697U

EFFICIENCY vs. OUTPUT CURRENT

MAX1697 TOC08

OUTPUT CURRENT (mA)

EFFICIENCY (%)

VIN = +2V

VIN = +5V

VIN = +3.3V

MAX1697

4 _______________________________________________________________________________________

Typical Operating Characteristics

(Circuit of Figure 1, capacitors from Table 2, VIN= +5V, SHDN = IN, TA= +25°C, unless otherwise noted.)

60mA, SOT23 Inverting Charge Pump
with Shutdown

MAX1697R

OUTPUT VOLTAGE

vs. OUTPUT CURRENT

0

-0.5

-1.0

-1.5

-2.0

-2.5

-3.0

OUTPUT VOLTAGE (V)

-3.5

-4.0

-4.5

-5.0
0203010 40 50 60 70 80

OUTPUT CURRENT (mA)

VIN = +2V

VIN = +3.3V

VIN = +5V

MAX1697 TOC01

0

-0.5

-1.0

-1.5

-2.0

-2.5

-3.0

OUTPUT VOLTAGE (V)

-3.5

-4.0

-4.5

-5.0
0203010 40 50 60 70 80

MAX1697S

OUTPUT VOLTAGE

vs. OUTPUT CURRENT

VIN = +2V

VIN = +3.3V

VIN = +5V

OUTPUT CURRENT (mA)

-0.5

-1.0

MAX1697 TOC02

-1.5

-2.0

-2.5

-3.0

OUTPUT VOLTAGE (V)

-3.5

-4.0

-4.5

-5.0

MAX1697T

OUTPUT VOLTAGE

vs. OUTPUT CURRENT

0

VIN = +2V

VIN = +3.3V

VIN = +5V

0203010 40 50 60 70 80

OUTPUT CURRENT (mA)

MAX1697 TOC03

0

vs. OUTPUT CURRENT

-0.5

-1.0

-1.5

-2.0

-2.5

-3.0

OUTPUT VOLTAGE (V)

-3.5

-4.0

-4.5

-5.0
0203010 40 50 60 70 80

OUTPUT CURRENT (mA)

EFFICIENCY vs. OUTPUT CURRENT

100

90

80

70

60

50

40

EFFICIENCY (%)

30

20

10

0

0203010 40 50 60 70 80

OUTPUT CURRENT (mA)

MAX1697U

OUTPUT VOLTAGE

VIN = +2V

VIN = +3.3V

VIN = +5V

MAX1697T

VIN = +2V

VIN = +5V

VIN = +3.3V

MAX1697 TOC04

MAX1697 TOC07

EFFICIENCY vs. OUTPUT CURRENT

MAX1697R

100

90

80

70

60

50

40

EFFICIENCY (%)

30

20

10

0

0203010 40 50 60 70 80

OUTPUT CURRENT (mA)

VIN = +3.3V

VIN = +2V

VIN = +5V

MAX1697 TOC05

EFFICIENCY vs. OUTPUT CURRENT

MAX1697S

100

90

80

70

60

50

40

EFFICIENCY (%)

30

20

10

0

0203010 40 50 60 70 80

OUTPUT CURRENT (mA)

VIN = +3.3V

VIN = +2V

VIN = +5V

MAX1697 TOC06