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POWER MANAGEMENT Description
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.
150mA Ultra Low Dropout, Low Noise Micropower Linear Regulator
PRELIMINARY Features
Ultra low dropout voltage - 165mV @ 150mA Guaranteed 150mA output current Low ground pin current at all loads <5A quiescent current in shutdown Wide input supply voltage range 2.5V to 16V in Wide output voltage range Excellent line regulation Industrial temperature range Surface mount packaging (5 pin SOT-23)
SC5205
u u u u u u The SC5205 uses a Semtech proprietary internal PNP device for the pass element, providing a low dropout u voltage of 165mV at a load of 150mA, while maintaining u u a ground pin current of 2750A.
The output noise is reduced by placing a 10nF capacitor on pin 4 (bypass).
Applications
Battery Powered Systems Cellular Telephones Cordless Telephones Pagers Personal Digital Assistants Portable Instrumentation Cameras Portable Consumer Equipment PCMCIA cards
u u Each device contains a bandgap reference, error u amplifier, PNP pass element, thermal and current u limiting circuitry and resistor divider network for setting u output voltage. u The SC5205 is packaged in a 5 pin SOT-23 surface mount u package for a very small footprint and it requires only a u 1F capacitor on the output and a 0.01F on the bypass u
pin for a minimum amount of external components.
Typical Application Circuit
U1 SC5205 1 VIN 2 3 EN + C1 1uF VIN GND EN BYP 4 C3 1uF VO 5 VO
+ 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 1.0F or greater should be used. CIN may be tantalum or aluminum electrolytic. (2) CO (C3) should be a 1F 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
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SC5205
POWER MANAGEMENT Absolute Maximum Ratings
Parameter Input Supply Voltage Power D i ssi pati on Thermal Resi stance Juncti on to Ambi ent Thermal Resi stance Juncti on to C ase Operati ng Ambi ent Temperature Range Operati ng Juncti on Temperature Range Storage Temperature Range Lead Temperature (Solderi ng) 10 sec ESD Rati ng (Human Body Model) Sy mbol VIN PD q JA q JC TA TJ TSTG TLEAD V ESD Limits -0.3 to +20 Internally Li mi ted 256 81 -40 to +85 -40 to +125 -65 to +150 300 2
PRELIMINARY
U nits V W C /W C /W C C C C kV
Electrical Characteristics
Unless specified: VIN = VO(NOM) + 1V, IO = 100A, CBYP = 10nF, CO = 1F, VENABLE 1.8V. Values in bold apply over the full operating temperature range.
Parameter Supply Voltage Range Output Voltage
Sy mbol VIN VO
Test C onditions
Min 2.5 -1% -3%
Ty p
Max 16
U nits V V
VO
+1% +3%
Output Voltage Temperature C oeffi ci ent Li ne Regulati on
TC REG(LINE) VIN = (VO(NOM) + 1V) to 16V
40 0.06 0.12 0.15
ppm/C %/V
Load Regulati on
REG(LOAD)
IO = 0.1mA to 150mA
0.001
0.004 0.007
%/mA
D ropout Voltage(1)
VD
IO = 100A
5
10 25
mV
IO = 50mA
100
150 200
mV
IO = 100mA
140
200 250
mV
IO = 150mA
165
250 300
mV
a 2001 Semtech Corp.
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SC5205
POWER MANAGEMENT Electrical Characteristics (Cont.)
Parameter Ground Pi n C urrent Sy mbol IGND Test C onditions IO = 100A Min Ty p 80
PRELIMINARY
Unless specified: VIN = VO(NOM) + 1V, IO = 100A, CBYP = 10nF, CO = 1F, VENABLE 1.8V. Values in bold apply over the full operating temperature range.
Max 125 150
U nits A
IO = 50mA
600
1000 1500
A
IO = 100mA
1600
2100 2600
A
IO = 150mA
2750
3300 4000
A
VEN < 0.4V (shutdown) C urrent Li mi t(2) Ri pple Rejecti on Rati o Thermal Regulati on RMS Output Noi se Enable Input Voltage ILIM PSRR
VO PD
0.01 300 50 0.05
5 500
A mA dB %/W
VO > (VO(NOM) - 5%) IO = 100A, f = 100Hz
en V EN
IO = 50mA, C BYP = 10nF, C O = 2.2F, BW = 10Hz to 99kHz Low = O/P OFF Hi gh = O/P ON 1.8
210 0.4
nV Hz
V
Enable Input C urrent
IEN
VEN 0.4V VEN 1.8V
-0.01 5
-1 10 20
A A
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.
a 2001 Semtech Corp.
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SC5205
POWER MANAGEMENT Pin Configuration
Top View
PRELIMINARY Ordering Information
D ev ice SC 5205-X.XC SKTR(1)(2) P ackag e 5 pi n 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 1 2 3 4 5 Pin N ame VIN GND EN BYP VO Pin Function Supply voltage i nput. Ground. Acti ve hi gh enable i nput. C onnect to VIN i f not bei ng used. Reference bypass. C onnect a 10nF capaci tor (requi red) between thi s pi n and GND to reduce output noi se Voltage output.
a 2001 Semtech Corp.
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SC5205
POWER MANAGEMENT Outline Drawing - SOT-23-5 PRELIMINARY
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
a 2001 Semtech Corp.
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