Rainbow Electronics MAX1853 User Manual

General Description

The MAX1852/MAX1853 monolithic, CMOS charge­pump voltage inverters in the ultra-small SC70 package
feature a low 15Ω output resistance, permitting loads
up to 30mA with maximum efficiency. The MAX1852/
MAX1853 are available with operating frequencies of
50kHz and 200kHz, respectively, allowing optimization
of supply current or external component size. Small
external components and micropower shutdown mode
make these devices 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. Both versions come in
a 6-pin SC70 package that is 40% smaller than a
SOT23.

Applications

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

Small LCD Panels

GaAsFET Bias Supplies

Handy-Terminals, PDAs

Battery-Operated Equipment

Features

♦ 30mA Output Current
♦ Low 15Ω Output Resistance

♦ 68µA Supply Current (MAX1852)

♦ Requires Only Two 0.68µF Capacitors (MAX1853)

♦ +2.5V to +5.5V Input Voltage Range

♦ 0.1µA Logic-Controlled Shutdown

♦ Two Switching Frequencies

50kHz (MAX1852)
200kHz (MAX1853)

♦ Slew-Rate Limited to Reduce EMI

♦ Ultra-Small 6-Pin SC70 Package

MAX1852/MAX1853

SC70 Inverting Charge Pumps

with Shutdown

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

C1+ C1-

IN

SHDN

OUT

GND

ON

0.68µF

0.68µF

OFF

INPUT

2.5V TO 5.5V

NEGATIVE
OUTPUT

-1

✕

V

IN

30mA

MAX1853

Typical Operating Circuit

19-1792; Rev 0; 9/00

Ordering Information

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

PART

MAX1852EXT - 40°C to + 85°C 6 SC70 AAL
MAX1853EXT - 40°C to + 85°C 6 SC70 AAM

TEMP.

RANGE

PIN ­PA C K A G E

TOP

MARK

TOP VIEW

OUT

GND

SHDN

1

2

3

MAX1852
MAX1853

SC70-6

C1+

6

C1-

5

IN

4

MAX1852/MAX1853

SC70 Inverting Charge Pumps
with Shutdown

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Circuit of Figure 1, capacitors from Table 2, VIN= +5V, SHDN = IN, TA= -40°C to +85°C, unless otherwise noted. Typical values are
at T

A

= +25°C.) (Note 1)

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 Short-Circuit to GND ..............................................1 minute

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SC70 (derate 3.1mW/°C above +70°C) .............245mW

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

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

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

Note 1: All devices are 100% production tested at T

A

= +25°C. All temperature limits are guaranteed by design.

Note 2: Output resistance is guaranteed with capacitor ESR of 0.3Ω or less.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range 2.5 5.5 V

Quiescent Supply Current

Shutdown Supply Current SHDN = GND

Oscillator Frequency

Voltage Conversion Efficiency I

Output Resistance (Note 2) I

Output Current Continuous, long-term 30 mA

SHDN Input Logic High +2.5V ≤ VIN ≤ +5.5V 0.7 × V
SHDN Input Logic Low +2.5V ≤ VIN ≤ +5.5V 0.3 × V

SHDN Bias Current SHDN = GND or IN

Wake-Up Time From Shutdown I

MAX1852

MAX1853

MAX1852

MAX1853

= 0 99 99.9 %

OUT

= 10mA

OUT

= 5mA

OUT

TA = +25°C 75 130

T

= -40°C to +85°C 150

A

TA = +25°C 165 320

T

= -40°C to +85°C 350

A

TA = +25°C 0.002 0.5

T

= +85°C 0.01

A

TA = +25°C 325068

T

= -40°C to +85°C2578

A

TA = +25°C 130 200 270

T

= -40°C to +85°C 110 310

A

TA = +25°C1530

T

= -40°C to +85°C40

A

TA = +25°C -100 1 100

T

= +85°C10

A

MAX1852 260

MAX1853 112

IN

IN

µA

µA

kHz

Ω

RMS

V

V

nA

µs

MAX1852/MAX1853

SC70 Inverting Charge Pumps

with Shutdown

_______________________________________________________________________________________ 3

Typical Operating Characteristics

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

-2.0

-2.5

-3.0

-3.5

-4.0

OUTPUT VOLTAGE (V)

-4.5

-5.0

-5.5
010155 202530

EFFICIENCY vs. LOAD CURRENT

100

90

80

70

60

50

40

EFFICIENCY (%)

30

20

10

0

0105 15202530

MAX1852

OUTPUT VOLTAGE

vs. LOAD CURRENT

VIN = +3.3V

VIN = +5V

LOAD CURRENT (mA)

MAX1853

VIN = +5V

VIN = +3.3V

LOAD CURRENT (mA)

VIN = +2.5V

-2.0

-2.5

MAX1852/3 toc01

-3.0

-3.5

-4.0

OUTPUT VOLTAGE (V)

-4.5

-5.0

-5.5

MAX1852/3 toc04

OUTPUT RESISTANCE (Ω)

MAX1853

OUTPUT VOLTAGE

vs. LOAD CURRENT

VIN = +3.3V

VIN = +5V

010155 202530

LOAD CURRENT (mA)

OUTPUT RESISTANCE vs. INPUT VOLTAGE

23

22

21

20

19

18

17

MAX1852

16

15

14

13

2.5 3.53.0 4.0 4.5 5.0 5.5

MAX1853

INPUT VOLTAGE (V)

MAX1852/3 toc02

MAX1852/3 toc05

SUPPLY CURRENT (µA)

EFFICIENCY vs. LOAD CURRENT

100

90

80

70

60

50

40

EFFICIENCY (%)

30

20

10

VIN = +5V

0

0105 15202530

NO-LOAD SUPPLY CURRENT

200

180

160

140

120

100

80

60

40

20

0

012345

MAX1852

VIN = +3.3V

VIN = +2.5V

LOAD CURRENT (mA)

vs. SUPPLY VOLTAGE

MAX1853

MAX1852

SUPPLY VOLTAGE (V)

MAX1852/3 toc03

MAX1852/3 toc06

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

8

7

6

5

4

3

SUPPLY CURRENT (nA)

2

1

0

-40 -15 10 35 60 85

TEMPERATURE (°C)

MAX1852/3 toc07

OUTPUT RESISTANCE vs. TEMPERATURE

MAX1852

28

26

24

22

20

18

OUTPUT RESISTANCE (Ω)

16

14

12

-40 -15 10 35 60 85

VIN = +2.5V

VIN = +3.3V

VIN = +5V

TEMPERATURE (°C)

MAX1852/3 toc08

OUTPUT RESISTANCE vs. TEMPERATURE

MAX1853

28

26

24

22

20

18

OUTPUT RESISTANCE (Ω)

16

14

12

-40 -15 10 35 60 85

VIN = +2.5V

VIN = +3.3V

VIN = +5V

TEMPERATURE (°C)

MAX1852/3 toc09