NSC LM2767M5X, LM2767M5 Datasheet

LM2767
Switched Capacitor Voltage Converter

LM2767 Switched Capacitor Voltage Converter

February 2000

General Description

The LM2767 CMOS charge-pump voltage converter oper­ates as a voltage doubler for an input voltage in the range of
+1.8V to +5.5V. Two low cost capacitors and a diode are
used inthiscircuit to provide at least 15 mAof output current.

The LM2767 operates at 11 kHz switching frequency to
avoid audio voice-band interference. With an operating cur­rent of only 40 µA (operating efficiency greater than 90%with
most loads), the LM2767 provides ideal performance for bat­tery powered systems. The device is manufactured in a
SOT23-5 package.

Basic Application Circuit

Voltage Doubler

Features

n Doubles Input Supply Voltage
n SOT23-5 Package
n 20Ω Typical Output Impedance
n 96%Typical Conversion Efficiency at 15mA

Applications

n Cellular Phones
n Pagers
n PDAs, Organizers
n Operational Amplifier Power Suppliers
n Interface Power Suppliers
n Handheld Instruments

DS101274-1

Ordering Information

Order Number Package

Number

LM2767M5 MA05B S17B (Note 1) Tape and Reel (1000 units/reel)

LM2767M5X MA05B S17B (Note 1) Tape and Reel (3000 units/reel)

Note 1: The small physical size of the SOT-23 package does not allow for the full part number marking. Devices will be marked with the designation shown in
the column Package Marking.

© 2000 National Semiconductor Corporation DS101274 www.national.com

Package

Marking

Supplied as

Connection Diagram

LM2767

Top View With Package Marking

Pin Description

Pin Name Function

1V
2 GND Power supply ground input.
3 CAP− Connect this pin to the negative terminal of the

4 V+ Power supply positive voltage input.
5 CAP+ Connect this pin to the positive terminal of the

DS101274-13

OUT

5-Lead SOT (M5)

DS101274-22

Actual Size

Positive voltage output.

charge-pump capacitor.

charge-pump capacitor.

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LM2767

Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

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

Continuous Output Current 30 mA

OUT

Output Short-Circuit Duration to GND (Note 3) 1 sec.
Continuous Power

Dissipation (T
T

(Note 4) 150˚C

JMax

=

25˚C)(Note 4)

A

) 5.8V

OUT

400 mW

Operating Ratings

θJA(Note 4) 210˚C/W

Junction Temperature Range −40˚C to 100˚C
Ambient Temperature Range −40˚C to 85˚C
Storage Temperature Range −65˚C to 150˚C
Lead Temp. (Soldering, 10 sec.) 240˚C
ESD Rating (Note 5)

Human Body Model
Machine Model

200V

2kV

Electrical Characteristics

Limits in standard typeface are for T
less otherwise specified: V+=5V, C

Symbol Parameter Condition Min Typ Max Units

V+ Supply Voltage 1.8 5.5 V
I

Q

I

L

R

OUT

f

OSC

f

SW

P

EFF

V

OEFF

Note 2: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.

Note 3: V
Note 4: The maximum allowable power dissipation is calculated by using P

ambient temperature, and θ
Note 5: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin. The machine model is a 200pF capacitor discharged directly

into each pin.
Note 6: In thetest circuit, capacitors C

voltage and efficiency.

Note 7: Specified output resistance includes internal switch resistance and capacitor ESR. See the details in the application information for positive voltage doubler.
Note 8: The output switches operate at one half of the oscillator frequency, f

Supply Current No Load 40 90 µA
Output Current 1.8V ≤ V+ ≤ 5.5V 15 mA
Output Resistance (Note 7) I
Oscillator Frequency (Note 8) 8 22 50 kHz
Switching Frequency (Note 8) 4 11 25 kHz
Power Efficiency RL(5.0k) between GND and

Voltage Conversion Efficiency No Load 99.96

may be shorted toGND for one second without damage. For temperatures above 85˚C, V

OUT

is the junction-to-ambient thermal resistance of the specified package.

JA

=

25˚C, and limits in boldface type apply over the full operating temperature range. Un-

J

=

=

C

1

and C2are 10 µF,0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output

1

10 µF. (Note 6)

2

L

OUT
I

L

=

15 mA 20 40 Ω

98

=

15 mA to GND 96

must not be shortedto GND or device may be damaged.

OUT

)/θJA, where T

is the maximum junction temperature, TAis the

JMax

DMax

OSC

=

(T

=

2f

JMax−TA

.

SW

%

%

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