Micrel MIC2215-PPGBML Triple high psrr, low noise î¼cap ldo Datasheet

MIC2215
Triple High PSRR, Low Noise µCap LDO
General Description
Features
The MIC2215 is a high performance, triple LDO voltage
regulator, with each regulator capable of providing 250mA
continuous output current.
Ideal for battery operated applications, the MIC2215 offers
1% initial accuracy, extremely low dropout voltage (100mV
@ 150mA), and low ground current at light load (typically
110µA per regulator). Equipped with a noise bypass pin
and featuring very high power supply ripple rejection
(PSRR) of up to 80dB, the MIC2215 provides the lowest
noise and highest efficiency solution for RF applications in
portable electronics such as cellular phones and wireless
LAN applications.
Equipped with TTL logic-compatible enable pins, each of
the regulators in the MIC2215 can be put into a zero
current off mode where the supply current is much less
than 1µA when all the regulators are disabled. The
MIC2215 is a µCap design, which enables a stable output
with small ceramic output capacitors, reducing both cost
and required board space for output bypassing.
The MIC2215 is available in the miniature 16-pin,
(4mm×4mm) MLF® package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
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•
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•
•
•
•
•
•
•
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Input voltage range: +2.25V to +5.5V
70dB PSRR
Stable with ceramic output capacitor
High output accuracy:
– ±1.0% initial accuracy
– ±2.0% over temperature
Low dropout voltage of 100mV@150mA
Low quiescent current:110µA per regulator
Fast turn-on time:30µs
Zero off-mode current
Thermal shutdown protection
Current-limit protection
Tiny 16-pin (4mm × 4mm) MLF® package
Applications
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Cellular phones
PCs and peripherals
Wireless LAN cards
PDAs
GPS
___________________________________________________________________________________________________________
Typical Application
MIC2215-xxx_ML
VIN1
VOUT1
Rx Chain
VIN2
VOUT2
Tx Chain
VIN3
VOUT3
OFF ON
EN1
OFF ON
EN2
OFF ON
EN3
CIN = 1µF
Ceramic
Synth/TCXO/VCO
CBYP
GND
COUT = 1µF
Ceramic
MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2007
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MIC2215
Ordering Information
Part Number
Part Number
Standard
(1)
Pb-Free
Voltage
(VO1/VO2/VO3)
Junction
Temp. Range
Package
MIC2215-MMMBML
MIC2215-MMMYML
2.8V/2.8V/2.8V
–40° to +125°C
16-Pin 4mm x 4mm MLF®
MIC2215-PMMBML
MIC2215-PMMYML
3.0V/2.8V/2.8V
–40° to +125°C
16-Pin 4mm x 4mm MLF®
MIC2215-PPGBML
MIC2215-PPGYML
3.0V/3.0V/1.8V
–40° to +125°C
16-Pin 4mm x 4mm MLF®
MIC2215-PPMBML
MIC2215-PPMYML
3.0V/3.0V/2.8V
–40° to +125°C
16-Pin 4mm x 4mm MLF®
MIC2215-PPPBML
MIC2215-PPPYML
3.0V/3.0V/3.0V
–40° to +125°C
16-Pin 4mm x 4mm MLF®
MIC2215-AAABML
MIC2215-AAAYML
Adj./Adj./Adj.
–40° to +125°C
16-Pin 4mm x 4mm MLF®
Note:
For other voltage options, contact Micrel for details.
Voltage
Code
Adj.
A
1.5
F
1.6
W
1.8
G
1.85
D
1.9
Y
2.0
H
2.1
E
2.5
J
2.6
K
2.65
I
2.7
L
2.8
M
2.85
N
2.9
O
3.0
P
3.1
Q
3.2
R
3.3
S
3.4
T
3.5
U
3.6
V
Table 1. Voltage Codes
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MIC2215
OUT3
ADJ3
ADJ1
OUT1
OUT3
OUT3
NC
OUT1
Pin Configuration
GND
VIN2
GND
VIN2
GND
OUT2
BYP
OUT2
BYP
EN3
MIC2215-xxx_ML (ML)
(Fixed)
EN3
VIN1
EN2
GND
EN1
VIN1
ADJ2
VIN3
EN2
OUT1
EN1
VIN3
OUT2
OUT1
MIC2215-AAA_ML (ML)
(Adjustable)
Pin Description
Pin Number
1
2
3
4
Pin Name
VOUT1
VIN1
VIN2
VOUT2
6
VOUT2
(Fixed)
ADJ2
(Adj.)
EN1
7
EN2
8
EN3
9
CBYP
10
11
12
13
GND
GND
VIN3
VOUT3
5
14
15
16
Exposed Pad
January 2007
VOUT3
(Fixed)
ADJ3
(Adj.)
NC
(Fixed)
ADJ1
(Adj.)
VOUT1
GND
Pin Function
Output voltage of regulator 1 (250mA). Connect externally to pin 16.
Supply input of regulator 1 (highest input voltage required for common circuitry).
Supply input of regulator 2.
Output voltage of regulator 2 (250mA). For fixed output device, connect pins 4
and 5 externally.
Output voltage of regulator 2 (250mA). For fixed output device, connect pins 4
and 5 externally.
Adjust Input. Feedback input for regulator 2.
Enable input to regulator 1. Enables regulator 1 output. Active high input.
High = on, low = off.
Enable input to regulator 2. Enables regulator 2 output. Active high input.
High = on, low = off.
Enable input to regulator 3. Enables regulator 3 output. Active high input.
High = on, low = off.
Reference Bypass: Connect external 0.01µF to GND to reduce output noise.
May be left open.
Ground.
Ground.
Supply input of regulator 3.
Output voltage of regulator 3 (250mA). For fixed output device, connect pins 13
and 14 externally.
Output voltage of regulator 3 (250mA). For fixed output device, connect pins 13
and 14 externally.
Adjust Input. Feedback input for regulator 3.
No Connect. Not internally connected.
Adjust Input. Feedback input for regulator 1.
Output voltage of regulator 1 (250mA). Connect externally to pin 1.
Ground.
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MIC2215
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Voltage (VIN) ............................................... 0V to 7V
Enable Voltage (VEN).............................................. 0V to 7V
Power Dissipation (PD) ........................... Internally Limited(3)
Junction Temperature (TJ) ........................–40°C to +125°C
Storage Temperature (Ts) .........................–65°C to +150°C
Lead Temperature (soldering, 5 sec.)........................ 260°C
ESD Rating(4)
Supply Voltage
(VIN1) ........................................................ 2.25V to 5.5V
(VIN2, VIN3) ..................................................2.25V to VIN1
Enable Voltage (VEN).............................................0V to VIN1
Junction Temperature (TJ) ........................ –40°C to +125°C
Package Thermal Resistance
4x4 MLF-16 (θJA) ...............................................45°C/W
Electrical Characteristics(5)
VIN1 = VIN2 = VIN3 = VOUT (highest nominal) +1.0V; COUT = 1.0µF, IOUT = 100µA; TJ = 25°C, bold values indicate
–40°C to + 125°C; unless noted.
Parameter
Condition
Min
Typ
–1
–2
Output Voltage Accuracy
Output Voltage Temp.
Coefficient
Max
Units
+1
+2
%
%
40
ppm/C
Line Regulation
VIN = VOUT +1V to 5.5V
0.015
0.3
Load Regulation
IOUT = 100µA to 250mA
0.3
0.5
Dropout Voltage
IOUT = 100µA
2
mV
IOUT = 50mA
32
mV
Ground Current
%/V
%
IOUT = 100mA
63
IOUT = 150mA
100
150
mV
mV
IOUT = 250mA
170
275
mV
IOUT1 = IOUT2 = IOUT3 = 100µA
280
400
µA
I OUT1 = 100µA; I OUT2/I OUT3 = off
110
150
µA
I OUT1 = I OUT2 = I OUT3 = 250mA
420
550
µA
Quiescent Current
VEN1 = V EN2 = V EN3 = 0V
0.2
1
µA
Ripple Rejection
VIN = VOUT +1.0V; IOUT = 150mA, f = 0.1kHz to 1kHz, CBYP = 0.1µF
70
dB
VIN = VOUT +0.4V; IOUT = 150mA, f = 0.1kHz to 1kHz, CBYP = 0.1µF
60
dB
VIN = VOUT +0.2V, IOUT = 150mA, f = 0.1kHz to 1kHz, CBYP = 0.1µF
45
dB
700
mA
Current Limit
350
VOUT = 0V (All regulators)
Output Voltage Noise
CBYP = 0.1µF, f = 10Hz to 100kHz
30
Turn-On Time
CBYP = 0.01µF
30
µVRMS
100
µs
0.4
V
Enable Input
Enable Input Voltage
Logic Low (Regulator shutdown)
1.5
Logic High (Regulator enabled)
Enable Input Current
V
VIL < 0.4V (Regulator shutdown)
1.0
µA
VIH > 1.5V (Regulator enabled)
0.01
µA
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. The maximum allowable power dissipation of any TA (ambient temperature) is PD(max) = (TJ(max) – TA) ÷ θJA. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
4. Devices are ESD sensitive. Handling precautions recommended.
5. Specification for packaged product only.
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MIC2215
Typical Characteristics
TA = +25°C, unless otherwise noted
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MIC2215
Typical Characteristics (cont.)
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MIC2215
Typical Characteristics (cont.)
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MIC2215
Functional Diagram
VIN1
VOUT1
EN1
VIN1
VOUT1
EN1
Current
Limit
Current
Limit
Error
Amp
Error
Amp
ADJ1
VOUT2
VIN2
Current
Limit
EN2
VIN2
VOUT2
Current
Limit
EN2
Error
Amp
Error
Amp
ADJ2
VOUT3
VIN3
Current
Limit
EN3
VIN3
VOUT3
Current
Limit
EN3
Error
Amp
Error
Amp
GND
ADJ3
Thermal
Limit
VREF
QuickStart
GND
Thermal
Limit
BYP
MIC2215 Block Diagram
(Adjustable)
QuickStart
BYP
MIC2215 Block Diagram
(Fixed)
The MIC2215 is specifically designed to work with lowESR ceramic capacitors, reducing the amount of board
space necessary for power applications, which is critical
in hand-held wireless devices.
Functional Description
The MIC2215 is a triple, low noise CMOS LDO.
Designed specifically for noise-critical applications in
handheld or battery-powered devices, the MIC2215
comes equipped with a noise reduction feature to filter
the output noise via an external capacitor. Other features
of the MIC2215 include a separate logic compatible
enable pin for each channel, current limit, thermal
shutdown, and ultra-fast transient response, all within a
small MLF® package.
January 2007
VREF
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MIC2215
Internal Reference
The internal band gap, or reference, is powered from the
VIN1 input. Due to some of the input noise (PSRR)
contributions being imposed on the band gap, it is
important to make V IN1 as clean as possible with good
bypassing close to the input.
Application Information
Enable/Shutdown
The MIC2215 comes with three active-high enable pins
that allow control of each individual regulator to be either
disabled or enabled. Forcing the enable pin low disables
the respective regulator and sends it into a “zero” offmode-current state. In this state, current consumed by
the individual regulator goes nearly to zero. This is true
for both regulators 2 and 3. Regulator 1’s input supply
pin is also used to power the internal reference. When
any regulator; either 1, 2, or 3 is enabled, an additional
20µA for the reference will be drawn through VIN1. All
three must be disabled to enter the “zero” current-offmode-state. Forcing the enable pin high enables each
respective output voltage. This part is CMOS and none
of the enable pins can be left floating; a floating enable
pin may cause an indeterminate state on the output.
Multiple Input Supplies
The MIC2215 can be used with multiple input supplies
when desired. The only requirement, aside from
maintaining the voltages within the operating ranges, is
that VIN1 always remains the highest voltage potential.
No-Load Stability
The MIC2215 will remain stable and in regulation with no
load, unlike many other voltage regulators. This is
especially important in CMOS RAM keep-alive applications.
Input Capacitor
The MIC2215 is a high performance, high bandwidth
device. Therefore, it requires a well-bypassed input
supply for optimal performance. A small 0.1µF capacitor
placed close to the input is recommended to aid in noise
performance. Low-ESR ceramic capacitors provide optimal performance at a mini-mum of space. Additional
high-frequency capacitors such as small valued NPO
dielectric type capacitors help to filter out high frequency
noise and are good practice in any RF-based circuit.
Thermal Considerations
The MIC2215 is designed to provide up to 250mA of
current per channel in a very small package. Maximum
power dissipation can be calculated based on the output
current and the voltage drop across the part. To
determine the maximum power dissipation of the
package, use the junction-to-ambient thermal resistance
of the device and the following basic equation:
PD(max) = (TJ(max) – TA)÷θJA
TJ(max) is the maximum junction temperature of the die,
125°C, and TA is the ambient operating temperature. θJA
is layout dependent; Table 2 shows examples of the
junction-to-ambient thermal resistance for the MIC2215.
Output Capacitor
The MIC2215 requires an output capacitor for stability.
The design requires 1µF or greater on the output to
maintain stability. The design is optimized for use with
low-ESR ceramic chip capacitors. X7R/X5R dielectrictype ceramic capacitors are recommended because of
their temperature performance. X7R-type capacitors
change capacitance by 15% over their operating temperature range and are the most stable type of ceramic
capacitors. Z5U and Y5V dielectric capacitors change
value by as much as 50% and 60%, respectively, over
their operating temperature ranges. To use a ceramic
chip capacitor with Y5V dielectric, the value must be
much higher than an X7R ceramic capacitor to ensure
the same minimum capacitance over the equivalent
operating temperature range.
16-Pin 4mm x 4mm MLF®
43°C/W
®
Table 2. MLF Thermal Resistance
The actual power dissipation of the regulator circuit can
be determined using the equation:
PDTOTAL = PDLDO1 + PDLDO2 + PDLDO3
PDLDO1 = (VIN1 – VOUT1) × IOUT1
PDLDO2 = (VIN2 – VOUT2) × IOUT2
PDLDO3 = (VIN3 – VOUT3) × IOUT3
Substituting PD (max) for PD and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC2215 at 60°C with
a minimum footprint layout, the maximum load currents
can be calculated as follows:
PD (max) = (125°C – 60°C)/43 °C/W
PD (max) = 1.511W
Bypass Pin
A capacitor can be placed from the noise bypass pin to
ground to reduce output voltage noise. The capacitor
bypasses the internal reference. There is one single
internal reference shared by each output, therefore the
bypassing affects each regulator. A 0.1µF capacitor is
recommended for applications that require low-noise
outputs. The bypass capacitor can be increased, further
reducing noise and improving PSRR. Turn-on time
increases slightly with respect to bypass capacitance.
January 2007
θJA Recommended
Minimum Footprint
Package
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MIC2215
The junction-to-ambient thermal resistance for the
minimum footprint is 43°C/W, from Table 2. The
maximum power dissipation must not be exceeded for
proper operation. Using a lithium-ion battery as the
supply voltage, 2.8V/250mA for channel 1, 3V/100mA for
channel 2 and 2.8V/50mA for channel 3, maximum
power can be calculated as follows:
PDLDO1 = (VIN1 – VOUT1) × IOUT1
PDLDO1 = (4.2V – 2.8V) × 250mA
PDLDO1 = 350mW
Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to
multiply the reference voltage to produce the desired
output voltage. The MIC2215 can be adjusted from
1.25V to (5.5V–max VDROPOUT) by using two external
resistors (Figure 1). The resistors set the output voltage
based on the following equation:
R1 ⎞
⎛
VOUT = VREF ⎜1 +
⎟
R2 ⎠
⎝
VREF = 1.25V
PDLDO2 = (VIN2 – VOUT2) × IOUT2
PDLDO2 = (4.2V – 3.0V) × 100mA
PDLDO2 = 120mW
MIC2215-AAA_ML
OUT1
PDLDO3 = (VIN3 – VOUT3) × IOUT3
PDLDO3 = (4.2V – 2.8V) × 50mA
PDLDO3 = 70mW
R1
ADJ1
R2
PDTOTAL = PDLDO1 + PDLDO2 + PDLDO3
PDTOTAL = 350mW + 120mW + 70mW
PDTOTAL = 540mW
The calculation shows that we are well below the
maximum allowable power dissipation of 1.511W for a
60°C ambient temperature. After the maximum power
dissipation has been calculated, it is always a good idea
to calculate the maximum ambient temperature for a
125°C junction temperature. Calculating maximum
ambient temperature as follows:
TA(max) = TJ(max) – (PD x θJA)
TA(max) =125°C – (540mW x 43°C/W)
TA(max) = 101°C
For more information, please refer to the Designing with
Low-Dropout Voltage Regulators Handbook.
January 2007
Figure 1. Adjustable Output
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MIC2215
Package Information
®
16-Pin (4mm x 4mm) MLF (ML)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its
use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.
January 2007
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