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PDF SC1452 Datasheet ( Hoja de datos )

Número de pieza SC1452
Descripción DUAL 150mA LDO REGULATOR WITH PROGRAMMABLE RESET
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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SC1452 Hoja de datos, Descripción, Manual
DUAL 150mA LDO REGULATOR WITH
PROGRAMMABLE RESET
SC1452
PRELIMINARY - August 7, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
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 2.5V 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.
FEATURES
= Up to 150mA per regulator output
= Low quiescent current
= 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
= <1uA off-mode current
= Logic controlled electronic enable
= Programmable reset
= Full industrial temperature range
Each regulator has an associated active-low reset sig-
nal 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 150µA with both out-
puts supplying 150mA). The dropout voltage is typically
165mV 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.
APPLICATIONS
= Cellular telephones
= Palmtop/Laptop computers
= Battery-powered equipment
= Bar code scanners
= SMPS post regulator/dc to dc modules
= High efficiency linear power supplies
ORDERING INFORMATION
Part Numbers
SC1452XIMSTR(1)(2)
Package
MSOP-10
Notes:
(1) Where X denotes voltage options - see table on
page 5.
(2) Only available in tape and reel packaging. A reel
contains 2500 devices.
The SC1452 comes in the low profile 10-lead MSOP
package.
TYPICAL APPLICATION
3.3V OUT
2.5V OUT
RESET A
RESET B
COUTA
1uF
COUTB
1uF
U1
1 OUTA
2 OUTB
3 GND
4 RSTA
5
RSTB
IN
ENA
BYP
ENB
DLYB
10
9
8
7
6
SC1452JIMS
3.3V IN
ENABLE OUTPUT A
ENABLE OUTPUT B
CBYP
10nF
CDLYB
10nF
CIN
1uF
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320

1 page

SC1452 pdf
PRELIMINARY - August 7, 2000
PIN CONFIGURATION
(Top View)
MSOP-10
MARKING INFORMATION
DUAL 150mA LDO REGULATOR WITH
PROGRAMMABLE RESET
SC1452
VOLTAGE OPTIONS
Replace X in the part number (SC1452XIMS) by the letter shown
below for the corresponding voltage option:
X
VOUTA (V)
VOUTB (V)
A 1.8 1.8
B 2.5 2.5
C 2.8 2.8
D 3.0 3.0
E 3.3 3.3
F 3.0 2.5
G 3.0 1.8
H 3.0 2.8
J 3.3 2.5
K 3.3 2.8
# = Voltage options (Example: 452F)
yyww = Datecode (Example: 0008)
XXXX = Lot Number (Example: E01102)
PIN DESCRIPTIONS
Pin # Pin Name
Pin Function
1 OUTA Regulator A output.
2 OUTB Regulator B output.
3 GND Ground pin.
4 RSTA Power on reset for regulator A. Active low when OUTA is below the reset threshold.
5 RSTB Power on reset for regulator B. Active low when OUTB is below the reset threshold.
6 DLYB Programmable delay for RESETB. Delay time can be set by connecting a capacitor, CDLYB, be-
tween this pin and ground. Ground this pin if using the default delay time.
7 ENB Active high enable pin for output B. CMOS compatible input. Connect to IN if not being used.
8 BYP Bypass pin for bandgap reference. Connect a 10nF capacitor, CBYP, between this pin and
ground for low noise operation.
9 ENA Active high enable pin for output A. CMOS compatible input. Connect to IN if not being used.
10 IN Input pin for both regulators.
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320

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