SC1452_06 Datasheet, PDF (1/15 Pages) Semtech Corporation – Dual 150mA LDO Regulator with Programmable Reset

SC1452
Dual 150mA LDO Regulator
with Programmable Reset
POWER MANAGEMENT
Description
The SC1452 is a state of the art device intended to
provide maximum performance and flexibility in battery
operated systems. It has been designed specifically to
fully support a single Li-Ion battery and its external charger
voltages.
The SC1452 contains two independently enabled, ultra
low dropout voltage regulators (ULDOs). It operates from
an input voltage range of 2.25V to 6.5V, and a wide
variety of output voltage options are available which are
designed to provide an initial tolerance of ±1% and ±2%
over temperature.
Each regulator has an associated active-low reset signal
which is asserted when the voltage output declines
below the preset threshold. Once the output recovers,
the reset continues to be asserted (delayed) for a
predetermined time, 50ms for reset A and 150ms for
reset B. In the case of regulator B, the delay time may be
reduced by the addition of an external capacitor.
The SC1452 has a bypass pin to enable the user to
capacitively decouple the bandgap reference for very low
output noise (down to 50µVrms).
The devices utilize CMOS technology to achieve very low
operating currents (typically 130uA with both
outputs supplying 150mA). The dropout voltage is
typically 155mV at 150mA, helping to prolong battery
life. In addition, the devices are guaranteed to provide
400mA of peak current for applications which require
high initial inrush current. They have been designed to
be used with low ESR ceramic capacitors to save cost
and PCB area.
The SC1452 comes in the low profile 10-lead MSOP
package.
Features
‹ Up to 150mA per regulator output
‹ Low quiescent current (130µA typical with both
outputs at 150mA)
‹ Low dropout voltage
‹ Wide selection of output voltages
‹ Stable operation with ceramic caps
‹ Tight load and line regulation
‹ Current and thermal limiting
‹ Reverse input polarity protection
‹ <1µA off-mode current
‹ Logic controlled enable
‹ Active low resets valid for V down to 0V
‹ Programmable reset
IN
‹ Full industrial temperature range
‹ 10-Pin MSOP package. Also available in Lead-free,
fully WEEE and RoHS compliant
Applications
‹ Cellular telephones
‹ Palmtop/Laptop computers
‹ Battery-powered equipment
‹ Bar code scanners
‹ SMPS post regulator/dc to dc modules
‹ High efficiency linear power supplies
‹ DSP supplies
Typical Application Circuit
3.0V OUT
2.5V OUT
RESET A
RESET B
COUTA
1uF
COUTB
1uF
U1
1 _OUTA
2 _OUTB
3 _GND
4 _RSTA
5 _RSTB
IN ¹⁰
ENA ⁹
BYP ⁸
ENB ⁷
DLYB ⁶
SC1452FIMS
3.3V IN
ENABLE OUTPUT A
ENABLE OUTPUT B
CBYP
10nF
CDLYB
CIN
10nF
1uF
Revision: September 20, 2006
1
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