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PDF S-L2985 Data sheet ( Hoja de datos )
| Número de pieza | S-L2985 | |
| Descripción | High Ripple Rejection WLP Package Low Dropout CMOS Voltage Regulator | |
| Fabricantes | Seiko Instruments | |
| Logotipo |  |
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Rev.2.0_00
HIGH RIPPLE-REJECTION WLP PACKAGE
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2985 Series
The S-L2985 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. Compared with the voltage
regulators using the conventional CMOS process,
a larger variety of capacitors are available,
including small ceramic capacitors. A super-small
WLP-4B package realizes high-density mounting.
Features
• Output voltage:
1.5 V to 5.5 V, selectable in 0.1 V steps.
• High-accuracy output voltage: ±1.0%
• Low dropout voltage:
190 mV typ. (3.0 V output product, IOUT = 100 mA)
• Low current consumption:
During operation: 50 µA typ., 90 µA max.
• High peak current capability:
• Built-in ON/OFF circuit:
During shutdown: 0.1 µA typ., 1.0 µA max.
150 mADaotuatSpuhteiest4pUos.csoibmle (@ VIN ≥ VOUT(S) + 1.0 V)*1
Ensures long battery life.
• Low ESR capacitor can be used: A ceramic capacitor of 0.47 µF or more can be used for the output
capacitor.
• High ripple rejection:
80 dB typ. (@ 1.0 kHz)
• Built-in overcurrent protector: Overcurrent of output transistor can be restricted.
• Super-small package:
WLP-4B
• Lead-free products
*1. Attention should be paid to the power dissipation of the package when the output current is large.
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Applications
• Power supply for battery-powered devices
• Power supply for personal communication devices
• Power supply for home electric/electronic appliances
• Power supply for cellular phones
Package
Package name
WLP-4B
Package
HB004-A
Drawing code
Tape
HB004-A
Reel
HB004-A
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HIGH RIPPLE-REJECTION WLP PACKAGE LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00
S-L2985 Series
Absolute Maximum Ratings
Table 3
(Ta = 25°C unless otherwise specified)
Item
Symbol
Absolute Maximum Rating
Unit
Input voltage
Output voltage
Power dissipation
Operating ambient temperature
VIN
VON/OFF
VOUT
PD
Topr
VSS − 0.3 to VSS + 7
VSS − 0.3 to VIN + 0.3
VSS − 0.3 to VIN + 0.3
225*1
−40 to +85
V
mW
°C
Storage ambient temperature
Tstg
−40 to +125
*1. Power dissipation is measured by the following SII evaluation board 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.
1. Measurement Conditions(Used the SII evaluation board C)
(1) Measurement Enviroment
(2) Board Material
(3) Board Size
: Mounted on board (with no wind)
: FR-4 (4-layer)
: 40 mm×40 mm×1.0 mm
2. Measurement Result
Power dissipation
: 225 mW
et4U.com
300 DataSheet4U.com
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200
100
0
0 50 100 150
Ambient temperature Ta (°C)
Figure 3 Power dissipation of package
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HIGH RIPPLE-REJECTION WLP PACKAGE LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.0_00
S-L2985 Series
Operation
1. Basic operation
Figure 11 shows the block diagram of the S-L2985 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
Current
supply
Vref
Error
amplifier
−
+
Reference voltage
circuit
*1
Rf
Vfb
Rs
VOUT
VSS
*1. Parasitic diode
et4U.com
Figure 11
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2. Output transistor
The S-L2985 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 the VOUT pin through a parasitic diode to the VIN pin.
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| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet S-L2985.PDF ] | |
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