Fairchild FAN2558, FAN2559 service manual

www.fairchildsemi.com

FAN2558/FAN2559

180mA Low Voltage CMOS LDO

Features

• Fixed 1.0V, 1.2V, 1.3V, 1.5V, 1.8V, 2.5V, 3.3V, 3.5V, 3.6V,

3.8V and Adjustable Output

•Power Good Indicator with Open Drain Output

• 180mA Output Current

• 100µA Ground Current

•C

for Low Noise Operation

bypass

•Fast Enable for CDMA Applications

• High Ripple Rejection

• Current Limit

• Thermal Shutdown

• Excellent Line and Load Regulation

• Requires Only 1µF Output Capacitor

• Stable with 0 to 300m Ω ESR

• TTL-level Compatible Enable Input

• Active Output Discharge

Applications

• Processor Power-up sequencing

•PDAs, Cell Phones

• Portable Electronic Equipment

• PCMCIA Vcc and Vpp regulation/switching

General Description

The FAN2558/9 low voltage CMOS LDOs feature fixed or
adjustable output voltage, 180mA load current, delayed
power good output (open drain) and 1% output accuracy
with excellent line and load regulation. An external bypass
capacitor provides ultra-low noise operation.

The FAN2558/9 low voltage LDOs incorporate both thermal
shutdown and short circuit protection. Output is stable with a
1µF, low ESR capacitor. The FAN2558/9 family is available
in 5-Lead SOT-23, 6-Lead SOT-23 and 2x2mm MLP-6
packages.

FAN2558: Fixed Output LDO with Power Good output

FAN2558ADJ: Adjustable Output LDO with Power Good

output

FAN2559: Fixed Output LDO with Power Good output,

Low Noise

Available standard output voltages are 1.0, 1.2V, 1.3V, 1.5V,

1.8V, 2.5V, 3.3V, 3.5V, 3.6V, and 3.8V. Custom output volt­age options are also available.

Typical Application

R

PG

FB

V

V

IN

OUT

SHDN

GND

CAP+

CAP-

EN

PG

FAN 2558

47KΩ47KΩ 47KΩ

R

PG

FB

V

V

IN

OUT

C

OUT

SHDN

GND

CAP+

CAP-

EN

FAN 2558ADJ

ADJ

PG

R
1

R
2

C

OUT

R

PG

FB

V

N

I

SHDN

GND

CAP+

CAP-

EN

FAN 2559

V

OUT

C
B

PG

C

OUT

YP

C
BYP

REV. 1.0.4 3/15/04

FAN2558/FAN2559 PRODUCT SPECIFICATIONS

Pin Assignments

TOP-VIEW

V

1

IN

2

GND

34

EN

V

5

V

OUT

PG

V

1

IN

2

GND

34

EN

6

V

5

ADJ/BYP

PG

OUT

NC/ADJ/BYP

OUT

PG

1

2

3

V

6

IN

5

GND

4

EN

FAN2558

5-Lead SOT-23 PACKAGE

FAN2558ADJ/FAN2559

6-Lead SOT-23 PACKAGE

FAN2558/FAN2558ADJ/FAN2559

2x2mm MLP-6 PACKAGE

Pin Name

Pin no.

FAN2558 FAN2558ADJ FAN2559

5SOT-23 2x2mm MLP-6 6SOT-23 2x2mm MLP-6 6SOT-23 2x2mm MLP-6

1V

IN

V

OUT

V

IN

V

OUT

V

IN

V

OUT

2 GND. NC GND. ADJ GND. BYP

3EN PG EN PGENPG

4PG EN PG ENPGEN

5V

OUT

6V

GND ADJ GND BYP GND

IN

V

OUT

V

IN

V

OUT

V

IN

Pin Descriptions

Symbol Pin Function Description

V

IN

V

OUT

GND Ground Connection

PG Power Good Output, Open Drain

ADJ Ratio of potential divider from V

BYP Reference Noise Bypass

EN Chip Enable Input. The regulator is fully enabled when TTL “H” is applied to this input. The regulator

Power Supply Input

Regulated Voltage Output

to ADJ determines output voltage

out

enters into shutdown mode when TTL “L” is applied to this input.

2

REV. 1.0.4 3/15/04

≥

PRODUCT SPECIFICATIONS FAN2558/FAN2559

Absolute Maximum Ratings

Parameter Min. Max. Units

V

to GND 6V

IN

Voltage on any other pin to GND -0.3 V

Junction Temperature (T

) -55 150 °C

J

Storage Temperature -65 150 °C

Lead Soldering Temperature, 10 seconds 300 °C

Power Dissipation (P

) Internally

D

Electrostatic Discharge (ESD) Protection (Note1) HBM 4 kV

CDM 1

+ 0.3 V

IN

Limited

W

Recommended Operating Conditions

Parameter Min. Typ. Max. Units

Supply Voltage Range, V

Supply Voltage Range, V

IN

IN

for V

for V

< 2.0V 2.7 5.5 V

OUT

2.0V V

OUT

OUT

+ V

DROPOUT

5.5 V

Load Current 180 mA

Enable Input Voltage V

EN

Power Good Output Voltage Range V

PG

0V

0V

IN

IN

V

V

Junction Temperature -40 125 °C

Thermal Resistance-Junction to Ambient SOT-23 (Note 2) 235

Thermal Resistance-Junction to Case, 2mm x 2mm

75

°C/W

6-lead MLP

Notes:

1. Using Mil Std. 883E, method 3015.7 (Human Body Model) and EIA/JESD22C101-A (Charge Device Model)

2. Junction to ambient thermal resistance, Θ
copper plains, number of via used, diameter of via used, available copper surface, and attached heat sink characteristics.

, is a strong function of PCB material, board thickness, thickness and number of

JC

REV. 1.0.4 3/15/04

3

FAN2558/FAN2559 PRODUCT SPECIFICATIONS

Electrical Characteristics

V

= V

IN

min (note 5) to 5.5V, V

IN

are at 25°C.

Symbol Parameter Conditions Min. Typ. Max. Units

V

EN

= V

, I

LOAD

= 100 µ A, T

IN

= -40°C to +85°C, unless otherwise noted. Typical values

A

Note:

3. Guaranteed ±1% output voltage accuracy parts are available on customer request.

4. Measured at constant junction temperature using low duty cycle pulse testing.

5. V

min = 2.7V or (V

IN

4

+ 1V), whichever is greater.

OUT

REV. 1.0.4 3/15/04

PRODUCT SPECIFICATIONS FAN2558/FAN2559

DC Electrical Characteristics (Continued)

VIN = VIN min (note 5) to 5.5V, V
values are at 25°C.

Symbol Parameter Conditions Min. Typ. Max. Units

PSRR Power Supply Rejection Ratio DC to 100kHz

e

Output Noise BW: 300Hz to 50kHz

N

EN

= VIN, I

= 100µA, TA = -40°C to +85°C, unless otherwise noted. Typical

LOAD

50 dB

C

=1µF

OUT

C

I

LOAD

= 10nF

BYPASS

= 0 to 150mA

V

≤ 1.8V

OUT

30 µV

C

=1µF

OUT

C

I

LOAD

= 10nF

BYPASS

= 0 to 150mA

RMS

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