ST LD39050PU105R, LD39050PU15R, LD39050PU18R User Manual

Features

■ Input voltage from 1.5 to 5.5 V

■ Ultra low dropout voltage (200 mV typ. at 500

mA load)

■ Very low quiescent current (20 µA typ. at no

load, 100 µA typ. at 500 mA load, 1 µA max in off mode)

■ Very low noise without bypass capacitor

■ Output voltage tolerance: ± 2.0 % @ 25 °C

■ 500 mA guaranteed output current

■ Wide range of output voltages available on

request: 0.8 V to 4.5 V with 100 mV step and ADJ from 0.8 V

■ Logic-controlled electronic shutdown

■ Compatible with ceramic capacitor

C

= 1 µF

OUT

■ Internal current and thermal limit

■ Package DFN6 (3 x 3 mm)

■ Temperature range: -40 °C to 125 °C

LD39050xx

500 mA low quiescent current

low noise voltage regulator

DFN6 (3 x 3 mm)

roll off at 10 kHz. An Enable logic control function puts the LD39050 in shut-down mode allowing a total current consumption lower than 1 µA. The device also includes short-circuit constant current limiting and thermal protection. Typical applications are mobile phones, personal digital assistants (PDAs), cordless phones and similar battery-powered systems.

Description

The LD39050 provides 500 mA maximum current from an input voltage ranging from 1.5 V to 5.5 V with a typical dropout voltage of 200 mV. Stability is provided using ceramic capacitors. The ultra low drop-voltage, low quiescent current and low noise features make it suitable for low power battery-powered applications. Power supply rejection is 65 dB at low frequencies and starts to

Table 1. Device summary

Part numbers Order codes Output voltages

LD39050XX LD39050PUR ADJ from 0.8 V

LD39050XX10 LD39050PU10R 1.0 V

LD39050XX12 LD39050PU12R 1.2 V

LD39050XX25 LD39050PU25R 2.5 V

LD39050XX33 LD39050PU33R 3.3 V

March 2009 Rev 1 1/24

www.st.com

24

Contents LD39050xx

Contents

1 Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.1 Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.2 Enable function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.3 Power Good function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

8 Different output voltage versions of the LD39050xx

available on request . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2/24

LD39050xx Diagrams

1 Diagrams

Figure 1. Schematic diagram for the LD39050PU

IN

BandGap

BandGap reference

reference

OpAmp

EN

Figure 2. Schematic diagram for the LD39050PUxx

Internal

Internal enable

enable

GND

Power-good

Current

limit

Thermal

protection

signal

PG

IN

ININ

OUT

ADJ

IN

EN

BandGap

BandGap reference

reference

Internal

Internal enable

enable

OpAmp

GND

Power-good

Current

limit

Thermal

protection

signal

PG

IN

ININ

OUT

R

1

NC

R

2

3/24

Pin configuration LD39050xx

2 Pin configuration

Figure 3. Pin connection (top view)

EN

GND

PG

LD39050PUxx

V

NC

V

IN

OUT

EN

GND

PG

LD39050PU

Table 2. Pin description

Pin n°

Symbol

LD39050PU LD39050PUxx

EN 1 1 Enable pin logic input: Low=shutdown, High=active

GND 2 2 Common ground

PG 3 3 Power Good

V

OUT

4 4 Output voltage

ADJ 5 - Adjust pin

V

IN

6 6 Input voltage of the LDO

NC - 5 Not connected

GND EXP pad Exposed pad must be connected to GND

Function

V

IN

ADJ

V

OUT

4/24

LD39050xx Maximum ratings

3 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

IN

V

OUT

EN Enable pin -0.3 to V

DC input voltage -0.3 to 7 V

DC output voltage -0.3 to VI + 0.3 (7 V max) V

+ 0.3 (7 V max) V

I

PG Power Good pin -0.3 to 7 V

ADJ Adjust pin 4 V

I

T

OUT

P

D

STG

OP

Output current Internally limited

Power dissipation Internally limited

Storage temperature range - 65 to 150 °C

Operating junction temperature range - 40 to 125 °C

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these conditions is not implied. All values are referred to GND.

Table 4. Thermal data

Symbol Parameter Value Unit

R

thJA

thJC

Thermal resistance junction-ambient 55 °C/W

Thermal resistance junction-case 10 °C/W

Table 5. ESD performance

Symbol Parameter Test conditions Value Unit

HBM 2 kV

ESD ESD protection voltage

MM 0.3 kV

5/24

Electrical characteristics LD39050xx

4 Electrical characteristics

TJ = 25 °C, V

= 1.8 V, CIN = C

IN

OUT

= 1 µF, I

= 10 mA, VEN = VIN, unless otherwise

OUT

specified.

Table 6. Electrical characteristics for the LD39050PU

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

IN

V

ADJVADJ

I

ADJ

ΔV

OUT

ΔV

OUT

ΔV

OUT

ΔV

OUT

V

DROP

Operating input voltage 1.5 5.5 V

I

=10 mA, TJ = 25°C 784 800 816

accuracy

OUT

= 10 mA, -40°C<TJ<125°C 776 800 824

I

OUT

mV

Adjust pin current 1µA

+1 V ≤ VIN ≤ 5.5 V,

V

Static line regulation

Transient line regulation

(1)

Static load regulation I

Transient load regulation

Dropout voltage

(2)

(1)

OUT

= 1 mA

I

OUT

ΔVIN=500 mV, I

=10 mA, tR=5

OUT

µs

ΔV

=500 mV, I

IN

= 10 mA to 500 mA 0.002 %/mA

OUT

I

= 10 mA to 500 mA, tR=5µs 40

OUT

= 10 mA to 500 mA, tF=5µs 40

I

OUT

IO = 500mA, V

=10 mA, tF=5 µs 10

OUT

fixed to 1.5V

OUT

40°C<TJ<125°C

0.01 %/V

10

200 400 mV

mVpp

e

N

SVR

I

Q

PG

I

SC

Output noise voltage

Supply voltage rejection

= 0.8V

V

OUT

Quiescent current

Power Good output threshold

10Hz to 100kHz, I V

= 0.8 V

OUT

VIN = 1.8V+/-V V I

V V I

I

I 40°C<T

V V

= 0.25V, freq. = 1kHz

RIPPLE

= 10 mA

OUT

= 1.8V+/-V

IN

= 0.25V, freq.=10 kHz

RIPPLE

= 100 mA

OUT

= 0 mA 20

OUT

= 0 mA, -40°C<TJ<125°C 50

OUT

= 0 to 500mA 100

OUT

=0 to 500mA, -

OUT

<125°C

J

input current in off mode:

IN

EN

= GND

(3)

Rising edge

Falling edge

OUT

RIPPLE

= 100 mA,

30 µV

65

62

200

0.001 1

0.92* V

OUT

0.8*

V

OUT

RMS

dB

µA

V

Power Good output voltage low Isink=6mA open drain output 0.4 V

Short-circuit current RL=0 600 800 mA

6/24

LD39050xx Electrical characteristics

Table 6. Electrical characteristics for the LD39050PU (continued)

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

EN

Enable input logic high V

I

Enable pin input current VEN= V

EN

t

ON

Turn on time

(4)

=1.5 V to 5.5 V, 40°C<TJ<125°C 0.9 V

IN

0.1 100 nA

30 µs

Thermal shutdown 160

Enable input logic low VIN=1.5 V to 5.5 V, 40°C<TJ<125°C 0.4 V

T

SHDN

Hysteresis 20

°C

Capacitance (see typical

C

Output capacitor

OUT

performance characteristics for

122µF

stability)

1. All transient values are guaranteed by design, not production tested

2. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply for output voltages below 1.5 V

3. PG pin floating

4. Turn-on time is time measured between the enable input just exceeding V reaching 95% of its nominal value

high value and the output voltage just

EN

7/24

Electrical characteristics LD39050xx

TJ = 25 °C, V

IN

= V

OUT(NOM)

+ 1 V, CIN = C

OUT

= 1 µF, I

= 10 mA, VEN = VIN, unless

OUT

otherwise specified.

Table 7. Electrical characteristics for the LD39050PUxx

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

IN

V

OUTVOUT

ΔV

OUT

ΔV

OUT

ΔV

OUT

ΔV

OUT

V

DROP

Operating input voltage 1.5 5.5 V

V

accuracy

Static line regulation

Transient line regulation

(1)

Static load regulation I

Transient load regulation

Dropout voltage

(2)

(1)

>1.5V, I

OUT

= 25°C

T

J

>1.5 V, I

V

OUT

-40°C<T

V

OUT

V

OUT

-40°C<T

V

OUT

I

OUT

<125°C

J

≤ 1.5 V, I

<125°C

J

+1 V ≤ VIN ≤ 5.5 V,

= 1 mA

ΔVIN=500 mV, I

=500 mV, I

ΔV

IN

= 10 mA to 500 mA 0.002 %/mA

OUT

I

= 10 mA to 500 mA, tR=5µs 40

OUT

= 10 mA to 500 mA, tF=5µs 40

I

OUT

I

= 500mA, V

OUT

-40°C<TJ<125°C

=10 mA,

OUT

= 10 mA,

OUT

= 10 mA ±20

OUT

=10 mA,

OUT

=10 mA, tR=5 µs 10

OUT

=10 mA, tF=5 µs 10

OUT

> 1.5 V

OUT

-2.0 2.0

-3.0 3.0

±30

mV

0.01 %/V

mVpp

200 400 mV

%

e

N

SVR

I

Q

PG

I

SC

Output noise voltage 10Hz to 100kHz, IO = 100 mA, 30 µV

Supply voltage rejection V

= 1.5V

OUT

Quiescent current

Power Good output threshold

Power Good output voltage low

VIN = V

OUT(NOM

V I

V V I

I

V V

= 0.1V, freq. = 1kHz

RIPPLE

= 10 mA

OUT

= V

IN

OUT(NOM)

= 0.1V, freq.=10 kHz

RIPPLE

= 100 mA

OUT

= 0 mA 20

OUT

= 0 mA, -40°C<TJ<125°C 50

OUT

= 0 to 500mA 100

OUT

= 0 to 500mA -40°C<TJ<125°C 200

OUT

input current in off mode:

IN

= GND

EN

Rising edge

Falling edge

Isink=6mA open drain output 0.4 V

)+0.5V+/-V

+0.5V+/-V

(3)

RIPPLE

65

62

0.001 1

0.92* V

OUT

0.8*

V

OUT

RMS

dB

µA

V

Short-circuit current RL=0 600 800 mA

8/24