How it Works
Micrel
Loading...
MIC5255
User Manual
13 pgs970.77 Kb0

Micrel MIC5255 User Manual

F
General Description
MIC5255
150mA Low Noise µCap CMOS LDO
Features
The MIC5255 is an efficient, precise CMOS voltage regulator optimized for ultra-low-noise applications. It offers 1% initial accuracy, extremely-low dropout voltage (135mV at 150mA) and low ground current (typically 90µA). The MIC5255 provides a very-low-noise output, ideal for RF applications where a clean voltage source is required. A noise bypass pin is also available for further reduction of output noise.
Designed specifically for handheld and battery-powered devices, the MIC5255 provides a TTL-logic-compatible en­able pin. When disabled, power consumption drops nearly to zero.
The MIC5255 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices.
Key features include current limit, thermal shutdown, faster transient response, and an active clamp to speed up device turn-off. Available in the 6-pin 2mm × 2mm MLF package, the IttyBitty Thin SOT-23-5, which offers the same footprint as the standard IttyBitty
®
SOT-23-5 package and the new
®
SOT-23-5, but only 1mm tall. The
MIC5255 offers a range of output voltages. Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
• Input voltage range: 2.7V to 6.0V
• Thin SOT package: 1mm height SOT-23-5
• Ultra-low output noise: 30µV(rms)
• Stability with ceramic output capacitors
• Ultra-low dropout: 135mV @ 150mA
• High output accuracy:
– 1.0% initial accuracy – 2.0% over temperature
• Low quiescent current: 90µA
• Tight load and line regulation
• TTL-Logic-controlled enable input
• “Zero” off-mode current
• Thermal shutdown and current limit protection
Applications
®
• Cellular phones and pagers
• Cellular accessories
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer/personal electronics
___________________________________________________________________________________________________________
Typical Application
MIC5255-x.x_M5
V
EN
IN
15
2
3
4
= 1.0µF
C
IN
Ceramic
Enable
Shutdown
EN (pin 3) may be connected directly to IN (pin 1).
IttyBitty is a registered trademark of Micrel, Inc
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
November 2006
V
OUT
C
OUT
Ceramic
C
BYP
= 1.0µF
= 0.01µ
Ultra-Low-Noise Regulator Application
408
1
M9999-110906
Micrel, Inc. MIC5255
Ordering Information
Part Number Marking
Standard Pb-Free Standard Pb-Free**
MIC5255-2.5BD5 MIC5255-2.5YD5 NW25 NW25 2.5V –40° to +125°C 5-Pin TSOT-23
MIC5255-2.5BM5 MIC5255-2.5YM5 LW25 KW25 2.5V –40° to +125°C 5-Pin SOT-23
MIC5255-2.6BD5 MIC5255-2.6YD5 NW26 NW26 2.6V –40° to +125°C 5-Pin TSOT-23
MIC5255-2.6BM5 MIC5255-2.6YM5 LW26 KW26 2.6V –40° to +125°C 5-Pin SOT-23
MIC5255-2.7BD5 MIC5255-2.7YD5 NW27 NW27 2.7V –40° to +125°C 5-Pin TSOT-23
MIC5255-2.7BM5 MIC5255-2.7YM5 LW27 KW27 2.7V –40° to +125°C 5-Pin SOT-23
MIC5255-2.75BM5 MIC5255-2.75YM5 LW2H KW2H 2.75V –40° to +125°C 5-Pin SOT-23
MIC5255-2.8BD5 MIC5255-2.8YD5 NW28 NW28 2.8V –40° to +125°C 5-Pin TSOT-23
MIC5255-2.8BM5 MIC5255-2.8YM5 LW28 KW28 2.8V –40° to +125°C 5-Pin SOT-23
MIC5255-2.8BML MIC5255-2.8YML W28 W28*** 2.8V –40° to +125°C 6-Pin 2x2 MLF®
MIC5255-2.85BD5 MIC5255-2.85YD5 NW2J NW2J 2.85V –40° to +125°C 5-Pin TSOT-23
MIC5255-2.85BM5 MIC5255-2.85YM5 LW2J KW2J 2.85V –40° to +125°C 5-Pin SOT-23
MIC5255-2.85BML MIC5255-2.85YML W2J W2J*** 2.85V –40° to +125°C 6-Pin 2x2 MLF®
MIC5255-2.9BD5 MIC5255-2.9YD5 NW29 NW29 2.9V –40° to +125°C 5-Pin TSOT-23
MIC5255-2.9BM5 MIC5255-2.9YM5 LW29 KW29 2.9V –40° to +125°C 5-Pin SOT-23
MIC5255-3.0BD5 MIC5255-3.0YD5 NW30 NW30 3.0V –40° to +125°C 5-Pin TSOT-23
MIC5255-3.0BM5 MIC5255-3.0YM5 LW30 KW30 3.0V –40° to +125°C 5-Pin SOT-23
MIC5255-3.0BML MIC5255-3.0YML W30 W30*** 3.0V –40° to +125°C 6-Pin 2x2 MLF®
MIC5255-3.1BM5 MIC5255-3.1YM5 LW31 KW31 3.1V –40° to +125°C 5-Pin SOT-23
MIC5255-3.2BM5 MIC5255-3.2YM5 LW32 KW32 3.2V –40° to +125°C 5-Pin SOT-23
MIC5255-3.3BD5 MIC5255-3.3YD5 NW33 NW33 3.3V –40° to +125°C 5-Pin TSOT-23
MIC5255-3.3BM5 MIC5255-3.3YM5 LW33 KW33 3.3V –40° to +125°C 5-Pin SOT-23
MIC5255-3.3BML MIC5255-3.3YML W33 W33*** 3.3V –40° to +125°C 6-Pin 2x2 MLF®
MIC5255-3.5BM5 MIC5255-3.5YM5 LW35 KW35 3.5V –40° to +125°C 5-Pin SOT-23
Notes:
* Other Voltage available. Contact Micrel for details.
** Under bar / Over bar symbol may not be to scale.
*** Over bar symbol located after Pin 1 identifier.
Voltage*
Junction
Temp. Range
Package
November 2006
2
M9999-110906
Micrel, Inc. MIC5255
Pin Configuration
EN
BYP
MIC5255-x.xBM5
5-Pin SOT23 (M5)
EN
BYP
MIC5255-x.xYM5
5-Pin SOT23 (M5)
IN
GND
2
13
EN
GND
2
IN
13
1EN
6 BYP
Wxx
NC
GND
LWxx
45
OUT
IN
GND
13
2
5-Pin Thin SOT23 (D5)
NWxx
45
BYP
MIC5255-x.xBD5
EN
GND
2
OUT
IN
13
2
IN
3
MIC5255-x.xBML
6-Pin 2x2 MLF
1EN
5
4
®
(ML)
6 BYP
OUT
Wxx
NC
KWxx
45
OUT
5-Pin Thin SOT23 (D5)
NWxx
45
BYP
MIC5255-x.xYD5
OUT
GND
2
IN
3
MIC5255-x.xYML
6-Pin 2x2 MLF
5
4
®
(ML)
OUT
Pin Description
Pin Number
SOT23-5
TSOT23-5
1 3 IN Supply Input.
2 2 GND Ground.
3 1 EN
4 6 BYP
5 4 OUT Regulator Output.
– 5 NC No internal connection.
– EP GND
Pin Number
6-MLF
Pin Name Pin Name
Enable/Shutdown (Input): CMOS compatible input. Logic high = enable; logic low = shutdown. Do not leave open.
Reference Bypass: Connect external 0.01µF CBYP 1.0µF capacitor to GND to reduce output noise. May be left open.
Ground: Internally connected to the exposed pad. Connect externally to GND pin.
November 2006
3
M9999-110906
Micrel, Inc. MIC5255
Absolute Maximum Ratings
Supply Voltage (VIN)............................................. 0V to +7V
Enable Voltage (V Power Dissipation (P Junction Temperature (T Storage Temperature (T
Lead Temperature (soldering, 5 sec.)........................ 260°C
EDS Rating
(4)
)............................................ 0V to +7V
EN
) ........................... Internally Limited
D
) ........................–40°C to +125°C
J
) .........................–60°C to +150°C
s
.................................................................. 2kV
(1)
Operating Ratings
Supply Voltage (VIN)........................................ +2.7V to +6V
Enable Voltage (V
(3)
Junction Temperature (T Thermal Resistance SOT23-5 ( 2x2 MLF-6 (
EN
θ
) ..................................................235°C/W
JA
θ
JA
Electrical Characteristics
VIN = V
Symbol Parameter Condition Min Typ Max Units
VO Output Voltage Accuracy I
V
V
VIN – V
IQ Quiescent Current VEN 0.4V (shutdown) 0.2
GND
PSRR Ripple Rejection
I
LIM
en Output Voltage Noise
Enable Input
VIL Enable Input Logic-Low Voltage VIN = 2.7V to 5.5V, regulator shutdown
VIH Enable Input Logic-High Voltage VIN = 2.7V to 5.5V, regulator enabled
Shutdown Resistance Discharge 500
Thermal Protection
Thermal Shutdown Temperature 150 °C
Thermal Shutdown Hysteresis 10 °C
+ 1V, VEN = VIN; I
OUT
Line Regulation VIN = V
LNR
Load Regulation
LDR
Dropout Voltage
OUT
Ground Pin Current
OUT
Current Limit V
(5)
= 100µA; TJ = 25°C,
(7)
(8)
bold
values indicate –40°C  TJ +125°C; unless noted.
= 100µA
OUT
+ 1V to 6V 0.02 0.05 %/V
OUT
I
= 0.1mA to 150mA
OUT
I
= 100µA 0.1 5 mV
OUT
I
= 100mA 90 150 mV
OUT
= 150mA 135
I
OUT
I
= 0mA 90 150 µA I
OUT
= 150mA 117 µA
I
OUT
f = 10Hz, C
= 1.0µF, C
OUT
f = 100Hz, VIN = V
f = 10kHz, V
= 0V 160 425 mV
OUT
C
= 1.0µF, C
OUT
IN
= V
(6)
= 0.01µF 60 dB
BYP
+1 60 dB
OUT
+1 50 dB
OUT
= 0.01µF,
BYP
f = 10Hz to 100kHz
VIL 0.4V, regulator shutdown 0.01 µA IEN Enable Input Current
V
1.6V, regulator enabled 0.01 µA
IH
(2)
).............................................. 0V to VIN
) ........................–40°C to +125°C
J
) .................................................90°C/W
–1
–2
1
2
1.5 2.5 %
200
250
1
30 µV(rms)
0.4
1.6
V
% %
mV mV
µA
V
November 2006
4
M9999-110906
Loading...
+ 9 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use