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Teilenummer | S-1131 |
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Beschreibung | HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR | |
Hersteller | Seiko Instruments | |
Logo | ||
Gesamt 29 Seiten Rev.3.0_01
HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT
CMOS VOLTAGE REGULATOR
S-1131 Series
www.DataSheet4U.com
The S-1131 Series is a positive voltage regulator
with a low dropout voltage, high output voltage
accuracy, and low current consumption developed
based on CMOS technology.
A built-in low on-resistance transistor provides a
low dropout voltage and large output current, and a
built-in overcurrent protector prevents the load
current from exceeding the current capacitance of
the output transistor. An ON/OFF circuit ensures a
long battery life, and small SOT-89-3, SOT-89-5
and 6-Pin HSON(A) packages realize high-density
mounting.
Features
• Output voltage:
• High-accuracy output voltage:
• Low dropout voltage:
• Low current consumption:
• High peak current capability:
• Built-in ON/OFF circuit:
• High ripple rejection:
• Built-in overcurrent protector:
• Small package:
• Lead-free products
1.5 V to 5.5 V, selectable in 0.1 V steps.
±1.0%
250 mV typ. (3.0 V output product, IOUT = 100 mA)
During operation: 35 µA typ., 65 µA max.
During shutdown: 0.1 µA typ., 1.0 µA max.
300 mA output is possible (at VIN ≥ VOUT(S) + 1.0 V)*1
Ensures long battery life.
70 dB typ. (at 1.0 kHz)
Overcurrent of output transistor can be restricted.
SOT-89-3, SOT-89-5, 6-Pin HSON(A)
*1. Attention should be paid to the power dissipation of the package when the output current is large.
Applications
• Power supply for DVD and CD-ROM drives
• Power supply for battery-powered devices
• Power supply for personal communication devices
• Power supply for note PCs
Packages
Package Name
SOT-89-3
SOT-89-5
6-Pin HSON(A)
Package
UP003-A
UP005-A
PD006-A
Drawing Code
Tape
UP003-A
UP005-A
PD006-A
Reel
UP003-A
UP005-A
PD006-A
Seiko Instruments Inc.
1
HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
6-Pin HSON(A)
Top view
654
123
www.DataSheet4U.com Bottom view
123
*1
Table 4
Pin No.
1
2
3
4
5
6
Symbol
VOUT
VSS
NC*1
NC*1
ON/OFF
VIN
Description
Output voltage pin
GND pin
No connection
No connection
Shutdown pin
Input voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
654
*2
*1. Connect the exposed thermal die
pad at shadowed area to the
board, and set electric potential
open or VSS.
However, do not use it as the
function of electrode.
*2. Be careful of the contact with
other wires because the pinch
lead has the same electric
potential as VSS.
Figure 5
Absolute Maximum Ratings
Table 5
Item
Input voltage
Output voltage
Power
dissipation
SOT-89-3
SOT-89-5
6-Pin HSON(A)
Operating ambient temperature
Storage temperature
Symbol
VIN
VON/OFF
VOUT
PD
Topr
Tstg
(Ta = 25°C unless otherwise specified)
Absolute Maximum Rating
Unit
VSS − 0.3 to VSS + 7
VSS − 0.3 to VIN + 0.3
VSS − 0.3 to VIN + 0.3
500
V
V
V
mW
500 mW
500 mW
−40 to +85
°C
−40 to +125
°C
Caution The absolute maximum ratings are rated values exceeding which the product could suffer
physical damage. These values must therefore not be exceeded under any conditions.
6 Seiko Instruments Inc.
6 Page HIGH RIPPLE-REJECTION LOW DROPOUT MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1131 Series
Rev.3.0_01
Operation
1. Basic operation
Figure 13 shows the block diagram of the S-1131 Series.
The error amplifier compares the reference voltage (Vref) with Vfb, which is the output voltage resistance-
divided by feedback resistors Rs and Rf. It supplies the output transistor with the gate voltage necessary
to ensure a certain output voltage free of any fluctuations of input voltage and temperature.
VIN
www.DataSheet4U.com
Current
supply
Vref
Error
amplifier
−
+
Reference voltage
circuit
*1
Rf
Vfb
Rs
VOUT
VSS
*1. Parasitic diode
Figure 13
2. Output transistor
The S-1131 Series uses a low on-resistance P-channel MOS FET as the output transistor.
Be sure that VOUT does not exceed VIN + 0.3 V to prevent the voltage regulator from being damaged due
to inverse current flowing from VOUT pin through a parasitic diode to VIN pin.
12 Seiko Instruments Inc.
12 Page | ||
Seiten | Gesamt 29 Seiten | |
PDF Download | [ S-1131 Schematic.PDF ] |
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