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PDF S-1172 Data sheet ( Hoja de datos )
| Número de pieza | S-1172 | |
| Descripción | HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR | |
| Fabricantes | Seiko Instruments | |
| Logotipo |  |
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Rev.1.1_00
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT
CMOS VOLTAGE REGULATOR
S-1172 Series
www.datasheet4u.com
The S-1172 Series, developed based on CMOS technology, is a positive
voltage regulator with a super low dropout voltage, high output voltage
accuracy, and low current consumption.
The S-1172 Series provides the very small dropout voltage and the large
output current due to the built-in transistor with low on-resistance. The
overcurrent protector prevents the load current from exceeding the
capacitance of output transistor. The thermal shutdown circuit prevents
damage caused by heat, the rush current control circuit limits the
excessive rush current during start-up.
The ON/OFF circuit ensures longer battery life. Various capacitors, also
small ceramic capacitors, can be used for this IC more than for the
conventional regulator ICs which have CMOS technology.
The packages, high heat radiation HSOP-6 and small SOT-89-5 enable
high-density mounting.
Features
• Output voltage :
• Low equivalent series resistance capacitor :
• Input voltage :
• High-accuracy output voltage :
• Low dropout voltage :
• Low current consumption :
• Output current :
• High ripple rejection :
• Built-in overcurrent protection circuit :
• Built-in thermal shutdown circuit :
• Built-in rush current control circuit :
• Built-in power on/off circuit :
• Small package :
• Lead-free product
1.0 to 5.0 V, selectable in 0.05 V step.
Ceramic capacitor of 4.7 µF or more can be used as the
I/O capacitor.
1.5 to 5.5 V
±1.0% (1.0 to 1.45 V output product : ±15 mV)
70 mV typ. (3.0 V output product, at IOUT = 300 mA)
During operation : 70 µA typ., 90 µA max.
(3.0 V output product)
During shutdown : 0.1 µA typ., 1.0 µA max.
1000 mA (3.0 V output product, at VIN ≥ VOUT(S) + 1.0 V)*1
70 dB typ. (at 1.0 kHz, VOUT = 1.0 V)
limits overcurrent of output transistor
prevents damage caused by heat
limits excessive rush current during start-up
Longer battery life
SOT-89-5, HSOP-6
*1. Attention should be paid to the power dissipation of the package when the output current is large.
Applications
• Power supply for battery-powered devices
• Power supply for TV, notebook PCs and home electric appliances
• Constant-voltage power supply for portable equipment
Packages
Package Name
SOT-89-5
HSOP-6
Package
UP005-A
FH006-A
Drawing Code
Tape
Reel
UP005-A
UP005-A
FH006-A
FH006-A
Land
FH006-A
Seiko Instruments Inc.
1
1 page  
Rev.1.1_00
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series
Pin Configuration
SOT-89-5
www.datasheet4u.comTop view
54
12 3
Figure 2
Table 2
Pin No.
Symbol
Description
1 ON/OFF Shutdown pin
2
VSS
GND pin
3
NC*1
No connection
4 VIN Input voltage pin
5
VOUT
Output voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
HSOP-6
Top view
65 4
12 3
Figure 3
Table 3
Pin No.
Symbol
Description
1
VOUT
Output voltage pin
2
VSS
GND pin
3 ON/OFF Shutdown pin
4
NC*1
No connection
5
VSS
GND pin
6 VIN Input voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
Seiko Instruments Inc.
5
5 Page 
Rev.1.1_00
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series
Standard Circuit
www.datasheet4u.com
Input
CIN*1
VIN VOUT
ON/OFF
VSS
Output
CL*2
Single GND
GND
*1. CIN is a capacitor for stabilizing the input.
*2. Ceramic capacitor of 4.7 µF or more can be used as CL.
Figure 11
Caution The above connection diagram and constant will not guarantee successful operation. Perform
thorough evaluation using the actual application to set the constant.
Application Conditions
Input capacitor (CIN) : 4.7 µF or more
Output capacitor (CL) : 4.7 µF or more (ceramic capacitor)
Caution
1. Set input capacitor (CIN) and output capacitor (CL) as CIN = CL.
2. Generally, series regulator may oscillate depending on the external components. Confirm that
no oscillation occurs in the application for which the above capacitors are used.
Selection of Input and Output Capacitors (CIN, CL)
The S-1172 Series requires an output capacitor between the VOUT and VSS pin for phase compensation. Operation
is stabilized by a ceramic capacitor with an output capacitance of 4.7 µF or more over the entire temperature range.
When using an OS capacitor, a tantalum capacitor, or an aluminum electrolytic capacitor, the capacitance must be 4.7
µF or more.
The values of output overshoot and undershoot, which are transient response characteristics, vary depending on the
value of output capacitor.
The required value of capacitance for the input capacitor differs depending on the application.
Set the value for input capacitor (CIN) and output capacitor (CL) as follows.
CIN ≥ 4.7 µF
CL ≥ 4.7 µF
CIN = CL
Caution
The S-1172 Series may oscillate if setting the value as CIN ≥ 4.7 µF, CL ≥ 4.7 µF, CIN < CL.
Define the values by sufficient evaluation including the temperature characteristics under the usage
condition.
Seiko Instruments Inc.
11
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| Páginas | Total 34 Páginas | |
| PDF Descargar | [ Datasheet S-1172.PDF ] | |
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