SC1538CS15 [SEMTECH]
DUAL LINEAR CONTROLLER; 双路线性控制器
| 型号： | SC1538CS15 |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | DUAL LINEAR CONTROLLER |
| 文件： | 总4页 (文件大小：68K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DUAL LINEAR CONTROLLER
SC1538
PRELIMINARY - October 5, 1999
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
The SC1538 is a dual power supply controller designed
to simplify power management on motherboards. It is
part of Semtech’s Smart LDO™ family of products.
The SC1538CS15/18 can provide a 1.818V power sup-
ply for the I/O plane and a 1.515V power supply for the
GTL+ and AGP planes. The SC1538CS25/25 can pro-
vide two 2.525V supplies for clock and memory.
•
•
Dual power supplies
1.515V Supply for GTL+ and AGP planes/1.818V
Supply for chipset I/O and memory termination
Dual 2.525V supplies for clock and memory
Individual Enable control of each supply
Over current protection
•
•
•
APPLICATIONS
SC1538 features include Enable controls for each lin-
ear FET controller and over current protection. Over
current protection is provided by feedback to the sense
pins. If any output drops below 1V (typical) for greater
than 4ms (typical), that output will shut down.
•
•
Motherboards
Simple dual power supplies
ORDERING INFORMATION
The SC1538 is available in a SO-8 surface mount
package.
Part Number(1)
SC1538CS15/18
SC1538CS25/25
Output Voltages
Package
SO-8
1.515V and 1.818V
2.525V and 2.525V
SO-8
Note:
(1) Add suffix ‘TR’ for tape and reel packaging.
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol Maximum Units
Input Supply Voltage
Input Pins
VIN
-0.5 to +15
-0.5 to +7
0 to +70
V
V
Operating Temperature
Range
TA
TJ
°C
Operating Junction
Temperature
0 to +125
°C
°C
Storage Temperature
Range
TSTG
TLEAD
-65 to +150
Lead Temperature
(Soldering) 10 Sec
300
130
47
°C
Thermal Temperature
Junction to Ambient
°C/W
°C/W
kV
θJA
θJC
PIN CONFIGURATION
Thermal Impedance
Junction to Case
Top View
ESD Rating
ESD
2
(SO-8)
1
© 1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
DUAL LINEAR CONTROLLER
SC1538
PRELIMINARY - October 5, 1999
PIN DESCRIPTION
Pin Pin Name
Pin Function
1
2
3
DRV1
SNS1
EN1
Output of regulator #1. Drives the gate of an N-channel MOSFET to maintain 1.818V/
2.525V.
Regulator #1 Sense input. Use as a remote sense to the source of the N-channel MOSFET
(Output 1).
Active high enable control with internal pullup. Output of regulator #1 turns off when EN1 is
taken low.
4
5
GND
EN2
Ground
Active high enable control with internal pullup. Output of regulator #2 turns off when EN2 is
taken low.
6
7
8
SNS2
DRV2
VIN
Regulator #2 Sense input. Use as a remote sense to the source of the N-channel MOSFET
(Output 2).
Output of regulator #2. Drives the gate of an N-channel MOSFET to maintain 1.515V/
2.525V.
+12V Supply.
APPLICATION CIRCUIT
3.3V IN
12V IN
Q1
Q2
1.818V / 2.525V OUT
PHB11N06LT
PHB11N06LT
1.515V / 2.525V OUT
C1
100uF
C2
100uF
C3
100uF
C4
100uF
C5
100uF
C6
100uF
R1
10k
R2
10k
U1
1
2
3
4
8
7
6
5
DRV1
SNS1
EN1
VIN
DRV2
SNS2
EN2
1.818V / 2.525V ENABLE
GND
1.818V / 2.525V ENABLE
SC1538
C7
0.1uF
2
© 1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
DUAL LINEAR CONTROLLER
SC1538
PRELIMINARY - October 5, 1999
ELECTRICAL CHARACTERISTICS
Unless specified, TA = 25°C. Values in bold apply over full operating temperature range.
Parameter
VIN
Symbol
Test Conditions
MIN
TYP
MAX Units
Supply Voltage
Quiescent Current
VIN
IQ
12.00
2
V
11.28
12.72
3
Both EN High
mA
4
One or both EN Low
1.5
2.0
2.5
mA
Undervoltage Lockout
Start Threshold
Enable
UVLO
IEN
8
V
7
9
Enable Pin Current
Input = Low
VEN rising
50
100
150
2.3
µA
Threshold Voltage
Hysteresis
Enable Delay Time(1)
VTH
VHYST
tD(ON)
V
1.6
180
500
mV
ns
100
300
EN = Low to High, measured from
EN = VTH to 10% DRV
Disable Delay Time(1)
tD(OFF)
EN = High to Low, measured from
EN = VTH to 90% DRV
150
ns
DRV
Output Current
Output Voltage
Rise Time(1)
IDRV
VDRV
tr
10
10.5
1.6
mA
V
5
Full On
9.0
EN = Low to High, measured from
EN = VTH to 90% DRV
ms
Fall Time(1)
tf
550
ns
V
Output Voltage Regulation
Output Voltage(1)
3.0V ≤ VFET(2) ≤ 3.6V, 1mA ≤ IO ≤ 1A
VO
-1.5%
VO +1.5%
-2.5%
+2.5%
Overcurrent Protection
Trip Threshold
VOC
1.00
5
V
-20%
+15%
Power-up Output Short
Circuit Immunity
1
60
ms
Output Short Circuit Glitch
Immunity
0.5
4
6
ms
Control Section
Bandwidth
DRV = 9V, THD = 5%, CL = 600pF
5
MHz
3
NOTES:
(1) See Application Circuit
(2) Connected to FET drains.
© 1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
DUAL LINEAR CONTROLLER
SC1538
PRELIMINARY - October 5, 1999
OUTLINE DRAWING - SO-8
JEDEC
REF: MS-012AA
LAND PATTERN - SO-8
ECN99-633 - 10-5-99
4
© 1999 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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