EUTECH EUP7559 Service Manual

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EUP7559

Low Noise Dual 300mA LDO

with Independent Shutdown

DESCRIPTION

The EUP7559 is a dual low dropout linear regulator
capable of sourcing 300mA current per regulator.

The EUP7559 is stable with small ceramic output
capacitors. The performance of EUP7559 is optimized
for battery power systems to deliver low noise, low
dropout voltage, low quiescent current and excellent
line and load transient response.

The EUP7559 is available in fixed output voltages in

the 8-pin 3mm×3mm TDFN leadless package.

FEATURES

z Input Voltage Range: 2.5V to 6V
z 300mA Output Current per LDO
z Low Dropout Voltage of 55mV@100mA
z Low Quiescent Current of 115µA per LDO
z High PSRR 70dB at 1kHz
z Low Output Noise
z Thermal Shutdown Protection
z Current Limit Protection
z Separate Enable pin per LDO
z Stable with Ceramic Output Capacitor
z 1.5V to 3.3V Pre-set Output
z 3mm×3mm TDFN-8 Package
z RoHS Compliant and 100% Lead (Pb)-Free

T ypical Application

APPLICATIONS

z Cellular Phones
z PDAs and Palmtop Computers
z Wireless LAN Cards
z Hand-Held Instruments

DS7559 Ver 1.0 May. 2007

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EUP7559

Block Diagram

DS7559 Ver 1.0 May. 2007

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EUP7559

Pin Configurations

Package Type Pin Configurations

TDFN-8

Pin Description

PIN Pin DESCRIPTION

INA 1

ENA 2

ENB 3

INB 4

OUTB 5

GND 6

BP 7

OUTA 8

LDO A Regulator Input. Connect to INB. Input voltage can range from 2.5V to 6V. Bypass
INA with a ceramic capacitor to GND.
Shutdown A Input. A logic-low on ENA shuts down regulator A. If ENA and ENB are both
low, both regulators and the internal reference are off and the supply current is reduced to
10nA (typ). If either ENA or ENB is a logic high, the internal reference is on. Connect
ENA to INA for always-on operation of regulator A.
Shutdown B Input. A logic-low on ENB shuts down regulator B. I
low, both regulators and the internal reference are off and the supply current is reduced to
10nA (typ). If either ENA or ENB is a logic high, the internal reference is on. Connect
ENB to INB for always-on operation of regulator B.
LDO B Regulator Input. Connect to INA. Input voltage can range from 2.5V to 6V. Bypass
INB with a ceramic capacitor to GND.
Regulator B Output. OUTB can source up to 300mA continuous current. Bypass OUTB
with a ceramic capacitor to GND. During shutdown, OUTB is internally discharged to

GND through a 300Ω. resistor.

Ground.

Reference Noise Bypass. Bypass BP with a low-leakage 0.01µF ceramic capacitor for
reduced noise at both outputs.
Regulator A Output. OUTA can source up to 300mA continuous current. Bypass OUTA
with a ceramic capacitor to GND. During shutdown, OUTA is internally discharged to

GND through a 300Ω. resistor.

f ENA and ENB are both

DS7559 Ver 1.0 May. 2007

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