SC1118ST-2.5TR [SEMTECH]
Fixed Positive LDO Regulator, 2.5V, 1.3V Dropout, BIPolar, PDSO4, SOT-223, 3 PIN;
| 型号： | SC1118ST-2.5TR |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Fixed Positive LDO Regulator, 2.5V, 1.3V Dropout, BIPolar, PDSO4, SOT-223, 3 PIN 光电二极管 输出元件 调节器 |
| 文件： | 总6页 (文件大小：187K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC1118
1A (Sink & Source) Low Dropout, Low
Quiescent Current Voltage Regulator
POWER MANAGEMENT
Description
Features
The SC1118 family of low dropout regulators has the
unique capability of maintaining output regulation while
sourcing or sinking current. The 2.85V output voltage
option is ideal for use as a Boulay termination of up to
27 SCSI data lines. The regulator maintains regulation
while both sourcing and sinking current, enabling the use
of active negation drivers for improved noise immunity
on the data lines. Regulation of output voltage is
maintained for TERMPWR voltages as low as 4.0V. When
unloaded, quiescent supply current is a low 2mA,
allowing continuous connection to the TERMPWR lines.
Regulates while sourcing or sinking current
Provides termination for up to 27 SCSI lines
2mA quiescent current
Ultra low power shutdown mode
Current limit and thermal shutdown protection
Stable for any CLOAD ≥ 0.22µF
Fast settling time
SOT-223 and SO-8 surface mount packages
Applications
Active negation SCSI terminations
Computers
Disk drives
An ultra low power shutdown mode is also available on
the SO-8 version. In shutdown the output is high
impedance and supply current drops to 100µA (typ.).
CD-ROM drives
Supply splitter
Current limits in both sourcing and sinking modes, plus
on-chip thermal shutdown make the circuit tolerant of
output fault conditions.
The SC1118 is available in the 3-lead SOT-223 and
8-lead SO-8 packages.
Typical Application Circuits
U1 SC1118S-x.x
U1 SC1118ST-x.x
3
1
1, 4
2
5
VIN
VOUT
VIN
VOUT
IN
OUT
IN
OUT
C1
C2
1uF
C1
C2
1uF
1uF
1uF
8
EN
NC
GND
GND
3, 6, 7
2, TAB
U1
SC1118S
OUT
1, 4
2
5
VIN
VOUT
IN
C1
R1
C2
1uF
R1
R2
1uF
VOUT = VFB • 1+
+ IFB • R1
8
FB
EN
GND
R2
3, 6, 7
Revision: June 10, 2004
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SC1118
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified
in the Electrical Characteristics section is not implied.
Parameter
Symbol
VIN
Maximum
17
Units
V
Supply Voltage
Power Dissipation
PD
Internally Limited
W
Thermal Resistance Junction to Case
SOT-223
SO-8
16
39
°C/W
°C/W
θJC
Thermal Resistance Junction to Ambient
SOT-223
SO-8
57
θJA
163
Operating Temperature Range
Junction Temperature Range
TA
TJ
0 to +85
-40 to +150
-65 to +150
300
°C
°C
°C
°C
kV
Storage Temperature Range
TSTG
TLEAD
VESD
Lead Temperature (Soldering) 10 Sec.
ESD Rating (Human Body Model)
2
Electrical Characteristics
Unless otherwise specified: TA = 25°C, VIN = VEN = 5V (2.5V, 2.85V and adjustable options, adjustable option set to 2V out), VIN = VEN = 7V (5V option),
IOUT = 0mA, CIN = COUT = 1µF. Values in bold apply over operating temperature range: 0 ≤ TJ = TA ≤ 85°C.
Parameter
Symbol
Conditions
Min
Typ
Max Units
(2)
Supply Voltage Range
Quiescent Current
VIN
IQ
VIN(min)
15
5
V
mA
µA
V
VEN = 5V
VEN = 0V
2
100
VOUT
250
+1%
+2%
1.01
1.02
25
Output Voltage(1)
VOUT
-1%
-2%
0.99
0.98
-1A ≤ IOUT ≤ 1A, VIN = VIN(MIN)(2) to 15V
Fixed output options
Feedback Voltage(1)(5)
VFB
1.00
16
V
-1A ≤ IOUT ≤ 1A, VIN = 3.7V to 15V
VO = VFB
Adjustable output option
Feedback Bias Current
Line Regulation(1)(5)
IFB
µA
REG(LINE)
ADJ, 2.5V, 2.85V: VIN = VIN(MIN)(2) to 15V
8
mV
5V: VIN = 6.5V to 15V
10
Load Regulation(1)(5)
ADJ, 2.5V, 2.85V
5V
REG(LOAD)
IOUT = -1A to 0A or 0A to 1A
10
20
mV
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SC1118
POWER MANAGEMENT
Electrical Characteristics
Unless otherwise specified: TA = 25°C, VIN = VEN = 5V (2.5V, 2.85V and adjustable options, adjustable option set to 2V out), VIN = VEN = 7V (5V option),
IOUT = 0mA, CIN = COUT = 1µF. Values in bold apply over operating temperature range: 0 ≤ TJ = TA ≤ 85°C.
Parameter
Symbol
Conditions
Min
Typ
Max Units
Dropout Voltage (1)(3)
VD
IOUT = 100mA
IOUT = 800mA
0.85
1.0
1.10
1.3
V
For Adjustable option
VO = 3.3V, VEN = VIN
IOUT = 1A
1.5
Minimum Output Voltage
Maximum Output Voltage
Output Current Limit(4)
VOUT(MIN)
VOUT(MAX)
ICL(+)
ADJ version
VFB
V
V
A
ADJ version
5.5
VOUT = (VOUT(NOM) - 100mV)
1
1.5
-1.5
5
ICL(-)
tS
VOUT = (VOUT(NOM) + 100mV)
IOUT = -1A to 0A or 0A to 1A
-1
Load Transient Settling Time,
µs
∆VOUT = 1%
Ripple Rejection
RA
VIH
VIL
IEN
f = 120Hz, (VIN - VOUT) = 2V, VAC = 0.5VP-P
Output ON
65
1.5
1.5
25
dB
V
Enable Input Threshold
1.8
Output OFF
0.4
60
Enable Input Bias Current
VEN = VIN = 7V (EN sinking)
VEN = 0V, VIN = 7V (EN sourcing)
µA
-25
155
-60
Thermal Shutdown Junction
Temperature
THI
°C
°C
Thermal Shutdown Hysteresis
THYST
15
Notes:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) VIN(MIN) for each voltage option is as follows:
Voltage Option VIN(MIN)
ADJ
2.5V
2.85V
5V
3.7V
4.2V
4.5V
6.5V
(3) Defined as the input to output differential at which the output voltage drops 1% below the value measured at
a differential of 2V.
(4) As V increases further towards GND or VIN, the current limit will fold back.
(5) AdjuOsUtTable option: for 3.7V ≤ VIN ≤ 5V, VEN = VIN,
for 5V ≤ VIN ≤ 15V, VEN = 5V
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SC1118
POWER MANAGEMENT
Pin Configurations
Ordering Information
Device(1)
Package
Top Views
SC1118S-X.XTR(2)
SO-8
SC1118STR(3)
SC1118ST-X.XTR(2)
SOT-223
Notes:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices (both packages).
(2) Where X.X denotes voltage options. Available
voltages are: 2.5V (-2.5), 2.85V (-2.85) and 5V (-5.0).
Contact factory for additional voltage options.
(3) Adjustable output voltage version (SO-8 only).
SOT-223
Fixed Output Voltage
SOT-223
Pin Function
1
2
3
OUT
GND
IN
Block Diagram
Adjustable Output Voltage
SO-8
TAB is GND
* R1 and R2 are only in fixed voltage parts. FB pin is
only present in adjustable part.
Pin Descriptions
Pin
Pin Number
Fixed SO-8 Adj. SO-8 SOT-223
Pin Function
Name
EN
FB
8
8
-
Active high enable input. CMOS/TTL compatible. Pulling this pin low shuts
the device down. Connected internally to IN in the SOT-223 package.
-
5
-
Feedback input. Connects to the inverting input of the error amplifier. Use
this pin to adjust the output voltage of the adjustable SO-8 parts (see
Application Circuit on page 1).
GND
IN
3, 6, 7
1, 4
3, 6, 7
1, 4
2/TAB Ground pin(s). Connect all ground connections to ground.
3
Input pin(s). Connect all pins to positive supply and to each other, decouple
with 1µF minimum.
NC
5
2
-
-
Not connected. Leave this pin floating.
OUT
2
1
Output pin. Connect a ≥ 0.22µF capacitor for stability.
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SC1118
POWER MANAGEMENT
Outline Drawing - SOT-223
Land Pattern - SOT-223
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SC1118
POWER MANAGEMENT
Outline Drawing - SO-8
Land Pattern - SO-8
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
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