SC5205-3.8CSKTRT [SEMTECH]
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| 型号： | SC5205-3.8CSKTRT |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | 暂无描述 线性稳压器IC 调节器 电源电路 光电二极管 输出元件 |
| 文件： | 总5页 (文件大小：138K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC5205
150mA Ultra Low Dropout, Low
Noise Micropower Linear Regulator
PRELIMINARY
POWER MANAGEMENT
Description
Features
The SC5205 is a 150mA ultra low dropout linear
regulator with a built in CMOS/TTL logic level enable
switch. It is designed specifically for battery powered
applications where low quiescent current and low
dropout are critical for battery longevity.
u Ultra low dropout voltage - 165mV @ 150mA
u Guaranteed 150mA output current
u Low ground pin current at all loads
u <5µA quiescent current in shutdown
u Wide input supply voltage range 2.5V to 16V in
u Wide output voltage range
u Excellent line regulation
u Industrial temperature range
u Surface mount packaging (5 pin SOT-23)
The SC5205 uses a Semtech proprietary internal PNP
device for the pass element, providing a low dropout
voltage of 165mV at a load of 150mA, while maintaining
a ground pin current of 2750µA.
Applications
The output noise is reduced by placing a 10nF capacitor
on pin 4 (bypass).
u Battery Powered Systems
u Cellular Telephones
u Cordless Telephones
u Pagers
u Personal Digital Assistants
u Portable Instrumentation
u Cameras
Each device contains a bandgap reference, error
amplifier, PNP pass element, thermal and current
limiting circuitry and resistor divider network for setting
output voltage.
The SC5205 is packaged in a 5 pin SOT-23 surface mount
package for a very small footprint and it requires only a
1µF capacitor on the output and a 0.01µF on the bypass
pin for a minimum amount of external components.
u Portable Consumer Equipment
u PCMCIA cards
Typical Application Circuit
U1 SC5205
1
5
4
VIN
VO
VIN
VO
2
GND
3
EN
BYP
EN
C1
1uF
C3
1uF
+
+
C2
10nF
Notes:
(1) CIN (C1) is needed if the device is far from the supplys filter capacitors, or for operation from a battery. A value
of 1.0µF or greater should be used. CIN may be tantalum or aluminum electrolytic.
(2) CO (C3) should be a 1µF or greater tantalum or aluminum electrolytic capacitor. Larger value capacitors will
improve the overall transient response.
(3) CBYP (C2 - required) should be placed as close as possible to pin 4 and ground. A 10nF ceramic capacitor is
recommended.
(4) EN may be tied to VIN if the shutdown feature is not required. Maximum EN voltage = VIN.
Revision 1, January 2001
1
www.semtech.com
SC5205
POWER MANAGEMENT
PRELIMINARY
Absolute Maximum Ratings
Parameter
Symbol
VIN
PD
Limits
-0.3 to +20
Internally Limited
256
Units
V
Input Supply Voltage
Power Dissipation
W
Thermal Resistance Junction to Ambient
Thermal Resistance Junction to Case
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
ESD Rating (Human Body Model)
°C/W
°C/W
°C
qJA
81
qJC
TA
-40 to +85
-40 to +125
-65 to +150
300
TJ
°C
TSTG
TLEAD
VESD
°C
°C
2
kV
Electrical Characteristics
Unless specified: VIN = VO(NOM) + 1V, IO = 100µA, CBYP = 10nF, CO = 1µF, VENABLE ³ 1.8V. Values in bold apply over the full operating temperature range.
Parameter
Symbol
VIN
Test Conditions
Min
2.5
Typ
Max
16
Units
Supply Voltage Range
Output Voltage
V
V
VO
-1%
-3%
VO
+1%
+3%
Output Voltage
Temperature Coefficient
TC
40
ppm/°C
%/V
Line Regulation
Load Regulation
Dropout Voltage(1)
REG(LINE)
VIN = (VO(NOM) + 1V) to 16V
IO = 0.1mA to 150mA
IO = 100µA
0.06
0.12
0.15
REG(LOAD)
0.001 0.004 %/mA
0.007
VD
5
10
25
mV
mV
mV
mV
IO = 50mA
100
140
165
150
200
200
250
250
300
IO = 100mA
IO = 150mA
ã 2001 Semtech Corp.
2
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SC5205
POWER MANAGEMENT
PRELIMINARY
Electrical Characteristics (Cont.)
Unless specified: VIN = VO(NOM) + 1V, IO = 100µA, CBYP = 10nF, CO = 1µF, VENABLE ³ 1.8V. Values in bold apply over the full operating temperature range.
Parameter
Symbol
Test Conditions
Min
Typ
Max
125
Units
Ground Pin Current
IGND
IO = 100µA
80
µA
150
IO = 50mA
IO = 100mA
600
1000
1500
µA
µA
µA
1600 2100
2600
IO = 150mA
2750 3300
4000
V
EN < 0.4V (shutdown)
0.01
300
50
5
µA
mA
dB
Current Limit(2)
ILIM
VO > (VO(NOM) - 5%)
IO = 100µA, f = 100Hz
500
Ripple Rejection Ratio
Thermal Regulation
PSRR
∆VO
0.05
%/W
PD
nV
Hz
RMS Output Noise
en
IO = 50mA, CBYP = 10nF, CO = 2.2µF,
BW = 10Hz to 99kHz
210
Enable Input Voltage
VEN
Low = O/P OFF
High = O/P ON
VEN £ 0.4V
0.4
V
1.8
Enable Input Current
IEN
-0.01
5
-1
10
20
µA
µA
VEN ³ 1.8V
Notes:
(1) Defined as the input to output differential at which the output voltage drops to 2% below the value measured at
a differential of 1V.
(2) As the load resistance further decreases, the SC5205 folds back the output current to approximately 150mA at
VO = 0V.
ã 2001 Semtech Corp.
3
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SC5205
POWER MANAGEMENT
PRELIMINARY
Pin Configuration
Ordering Information
Device
Package
Top View
SC5205-X.XCSKTR(1)(2)
5 pin SOT-23
Notes:
(1) Where -X.X denotes voltage options. Available
voltages are: 1.8V, 2.5V, 2.8V, 3.0V, 3.3V, 3.6V, 3.8V,
4.0V and 5.0V.
(2) Only available in tape and reel packaging. A reel
contains 3000 devices.
SOT-23-5
Block Diagram
Pin Descriptions
Pin
Pin Name Pin Function
1
2
3
4
VIN
GND
EN
Supply voltage input.
Ground.
Active high enable input. Connect to VIN if not being used.
BYP
Reference bypass. Connect a 10nF capacitor (required) between this pin and GND to reduce
output noise
5
VO
Voltage output.
ã 2001 Semtech Corp.
4
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SC5205
POWER MANAGEMENT
PRELIMINARY
Outline Drawing - SOT-23-5
Land Pattern - SOT-23-5
Contact Information
Semtech Corporation
Power Management Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
ã 2001 Semtech Corp.
5
www.semtech.com
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