April 2004 1 M9999-042704
MIC2215 Micrel
MIC2215
Triple High PSRR, Low Noise µCap LDO
General Description
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 featur-
ing 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.
All support documentation can be found on Micrel’s web site
at www.micrel.com.
Typical Application
VIN1
VIN2
VIN3 VOUT3
EN1
EN2
EN3
COUT = 1µF
Ceramic
CIN = 1µF
Ceramic
CBYP
VOUT1
VOUT2
GND
MIC2215-xxxBML
OFF ON
OFF ON
OFF ON
Rx Chain
Tx Chain
Synth/TCXO/VCO
Features
•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
•Cellular phones
•PCs and peripherals
•Wireless LAN cards
•PDAs
•GPS
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Micro
LeadFrame and MLF are trademarks of Amkor Technology.
MIC2215 Micrel
M9999-042704 2 April 2004
Ordering Information
Voltage(1) Junction
Part Number VO1/VO2/VO3Temperature Range Package
MIC2215-PMMBML 3.0V/2.8V/2.8V –40°C to +125°C 16-Pin MLF™
MIC2215-PPPBML 3.0/V3.0V/3.0V –40°C to +125°C 16-Pin MLF™
MIC2215-AAABML Adj./Adj./Adj. –40°C to +125°C 16-Pin MLF™
Note:
1. For other voltage options, contact Micrel, Inc.
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
April 2004 3 M9999-042704
MIC2215 Micrel
Pin Description
Fixed Output Adj. Output Pin Number Pin Function
VOUT1 VOUT1 1 Output voltage of regulator 1 (250mA). Connect externally to pin 16.
VIN1 VIN1 2 Supply input of regulator 1 (highest input voltage required for common
circuitry).
VIN2 VIN2 3 Supply input of regulator 2.
VOUT2 VOUT2 4 Output voltage of regulator 2 (250mA). For fixed output device, connect pins
4 and 5 externally.
VOUT2 —5 Output voltage of regulator 2 (250mA). For fixed output device, connect pins
4 and 5 externally.
—ADJ2 5 Adjust Input. Feedback input for regulator 2.
EN1 EN1 6 Enable input to regulator 1. Enables regulator 1 output. Active high input.
High = on, low = off.
EN2 EN2 7 Enable input to regulator 2. Enables regulator 2 output. Active high input.
High = on, low = off.
EN3 EN3 8 Enable input to regulator 3. Enables regulator 3 output. Active high input.
High = on, low = off.
CBYP CBYP 9 Reference Bypass: Connect external 0.01µF to GND to reduce output noise.
May be left open.
GND GND 10 Ground.
GND GND 11 Ground.
VIN3 VIN3 12 Supply input of regulator 3.
VOUT3 VOUT3 13 Output voltage of regulator 3 (250mA). For fixed output device, connect pins
13 and 14 externally.
VOUT3 —14 Output voltage of regulator 3 (250mA). For fixed output device, connect pins
13 and 14 externally.
—ADJ3 14 Adjust Input. Feedback input for regulator 3.
N/C —15 No Connect. Not internally connected.
—ADJ1 15 Adjust Input. Feedback input for regulator 1.
VOUT1 VOUT1 16 Output voltage of regulator 1 (250mA). Connect externally to pin 1.
GND GND Exposed Pad Ground.
Pin Configuration
1
2
3
4
12
11
10
9
16 15 14 13
5678
OUT1
VIN1
VIN2
OUT2
VIN3
GND
GND
BYP
OUT3
OUT3
NC
OUT1
EN3
EN2
EN1
OUT2
MIC2215-xxxBML (ML)
(Fixed)
1
2
3
4
12
11
10
9
16 15 14 13
5678
OUT1
VIN1
VIN2
OUT2
VIN3
GND
GND
BYP
OUT3
ADJ3
ADJ1
OUT1
EN3
EN2
EN1
ADJ2
MIC2215-AAABML (ML)
(Adjustable)
MIC2215 Micrel
M9999-042704 4 April 2004
Electrical Characteristics(4)
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 Conditions Min Typ Max Units
Output Voltage Accuracy –1.0 +1.0 %
–2.0 +2.0 %
Output Voltage Temp. Coefficient 40 ppm/C
Line Regulation VIN = VOUT +1V to 5.5V 0.015 0.3 %/V
Load Regulation IOUT = 100µA to 250mA 0.3 0.5 %
Dropout Voltage IOUT = 100µA2mV
IOUT = 50mA 32 mV
IOUT = 100mA 63 mV
IOUT = 150mA 100 150 mV
IOUT = 250mA 170 275 mV
Ground Current IOUT1 = IOUT2 = IOUT3 = 100µA 280 400 µA
IOUT1 = 100µA; IOUT2/IOUT3 = off 110 150 µA
IOUT1 = IOUT2 = IOUT3 = 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, 70 dB
CBYP = 0.1µF
VIN = VOUT + 0.4V; IOUT = 150mA, f = 0.1kHz to 1kHz, 60 dB
CBYP = 0.1µF
VIN = VOUT + 0.2V, IOUT = 150mA, f = 0.1kHz to 1kHz, 45 dB
CBYP = 0.1µF
Current Limit VOUT = 0V (All regulators) 350 700 mA
Output Voltage Noise CBYP = 0.1µF, f =10Hz to 100kHz 30 µVrms
Turn-On Time CBYP =0.01µF30100 µs
Enable Input
Enable Input Voltage Logic Low (Regulator shutdown) 0.4 V
Logic High (Regulator enabled) 1.5 V
Enable Input Current VIL < 0.4V (Regulator shutdown) 1.0 µA
VIH > 1.5V (Regulator enabled) 0.01 µA
Notes:
1. Exceeding maximum ratings may damage the device.
2. The device is not guaranteed to work outside its operating ratings.
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. Specification for packaged product only.
Absolute Maximum Ratings(1)
Supply Input Voltage (VIN) .................................. 0V to +7V
Enable Input 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
Operating Ratings(2)
Supply Input Voltage
(VIN1) ..................................................... +2.25V to +5.5V
(VIN2, VIN3) ...............................................+2.25V to VIN1
Enable Input Voltage (VEN) .................................0V to VIN1
Junction Temperature (TJ) .......................–40°C to +125°C
Package Thermal Resistance
MLF™ (θJA).........................................................45°C/W
April 2004 5 M9999-042704
MIC2215 Micrel
Typical Characteristics
0
20
40
60
80
100
120
140
160
-40 -20 0 20 40 60 80 100 120
GROUND CURRENT (µA)
TEMPERATURE (°C)
Ground Current
vs. Temperature for LDO 1
LOAD = 100mA
LOAD = 50mA
LOAD = 0mA
0
20
40
60
80
100
120
140
-40 -20 0 20 40 60 80 100 120
GROUND CURRENT (µA)
TEMPERATURE (°C)
Ground Current
vs. Temperature for LDO 2
LOAD = 100mA
LOAD = 50mA
LOAD = 0mA
0
20
40
60
80
100
120
140
-40 -20 0 20 40 60 80 100 120
GROUND CURRENT (µA)
TEMPERATURE (°C)
Ground Current
vs. Temperature for LDO 3
LOAD = 100mA
LOAD = 50mA
LOAD = 0mA
2.97
2.98
2.99
3.00
3.01
3.02
3.03
-40 -20 0 20 40 60 80 100 120
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Temperature for LDO 1
2.97
2.98
2.99
3.00
3.01
3.02
3.03
-40 -20 0 20 40 60 80 100 120
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Temperature for LDO 2
2.97
2.98
2.99
3.00
3.01
3.02
3.03
-40 -20 0 20 40 60 80 100 120
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage
vs. Temperature for LDO 3
0
50
100
150
200
250
-40 -20 0 20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature for LDO 1
250mA LOAD
50mA LOAD
150mA LOAD
VOUT = 3V
0
50
100
150
200
250
-40 -20 0 20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature for LDO 3
250mA LOAD
50mA LOAD
150mA LOAD
VOUT = 3V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
2.25 3 3.75 4.5 5.25
ENABLE THRESHOLD (V)
SUPPLY VOLTAGE (V)
Enable Threshold
vs. Suppl
y
Volta
g
e for LDO 1
Enable ON
Enable OFF
0
0.2
0.4
0.6
0.8
1
1.2
1.4
2.25 3 3.75 4.5 5.25
ENABLE THRESHOLD (V)
SUPPLY VOLTAGE (V)
Enable Threshold
vs. Suppl
y
Volta
g
e for LDO 2
Enable ON
Enable OFF
0
0.2
0.4
0.6
0.8
1
1.2
1.4
2.25 3 3.75 4.5 5.25
ENABLE THRESHOLD (V)
SUPPLY VOLTAGE (V)
Enable Threshold
vs. Supply Voltage for LDO 3
Enable OFF
0
50
100
150
200
250
-40 -20 0 20 40 60 80 100 120
DROPOUT VOLTAGE (mV)
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature for LDO 2
250mA LOAD
50mA LOAD
150mA LOAD
VOUT = 3V
TA = +25°C, unless otherwise noted.
MIC2215 Micrel
M9999-042704 6 April 2004
0
5
10
15
20
25
30
35
40
45
50
2.25 3 3.75 4.5 5.25
DELAY (µs)
SUPPLY VOLTAGE (V)
Enable Delay
vs. Suppl
y
Volta
g
e
LDO 2
LDO 1
LDO 3
CBYP = 0.1µF
0
20
40
60
80
100
120
140
160
0 50 100 150 200 250
GROUND CURRENT (µA)
OUTPUT CURRENT (mA)
Ground Current
vs. Load Current for LDO 1
0
20
40
60
80
100
120
140
160
0 50 100 150 200 250
GROUND CURRENT (µA)
OUTPUT CURRENT (mA)
Ground Current
vs. Load Current for LDO 2
0
20
40
60
80
100
120
140
160
0 50 100 150 200 250
GROUND CURRENT (µA)
OUTPUT CURRENT (mA)
Ground Current
vs. Load Current for LDO 3
2.980
2.985
2.990
2.995
3.000
3.005
3.010
3.015
3.020
0 50 100 150 200 250
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Load Regulation LDO 1
2.980
2.985
2.990
2.995
3.000
3.005
3.010
3.015
3.020
0 50 100 150 200 250
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Load Re
g
ulation LDO 2
2.980
2.985
2.990
2.995
3.000
3.005
3.010
3.015
3.020
0 50 100 150 200 250
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
Load Regulation LDO 3
0
20
40
60
80
100
120
140
160
180
0 50 100 150 200 250
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current for LDO 1
0
20
40
60
80
100
120
140
160
180
0 50 100 150 200 250
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current for LDO 2
0
20
40
60
80
100
120
140
160
180
0 50 100 150 200 250
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current for LDO 3
0
20
40
60
80
100
120
140
160
180
200
012345
GROUND CURRENT (µA)
SUPPLY VOLTAGE (V)
Ground Current
vs. Suppl
y
Volta
g
e for LDO 1
100µA
150mA
250mA
VOUT = 3V
0
20
40
60
80
100
120
140
160
180
200
012345
GROUND CURRENT (µA)
SUPPLY VOLTAGE (V)
Ground Current
vs. Suppl
y
Volta
g
e for LDO 2
100µA
150mA
250mA
VOUT = 3V
April 2004 7 M9999-042704
MIC2215 Micrel
0
0.5
1
1.5
2
2.5
3
3.5
012345
OUTPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
Output Voltage
vs. Suppl
y
Volta
g
e for LDO 1
100µA
10mA
250mA
0
0.5
1
1.5
2
2.5
3
3.5
012345
OUTPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
Output Voltage
vs. Supply Voltage for LDO 2
100µA
10mA
250mA
0
0.5
1
1.5
2
2.5
3
3.5
012345
OUTPUT VOLTAGE (V)
SUPPLY VOLTAGE (V)
Output Voltage
vs. Suppl
y
Volta
g
e for LDO 3
100µA
10mA
250mA
Power Supply Rejection Ratio
3VOUT
200mV V∆
400mV V∆
1.0V V∆
1.2V V∆
2V V∆
100 1M
1K 10K 100K
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
PSRR (dB)
FREQUENCY (Hz)
400mV∆
200mV∆
600mV∆
1V∆
CBYP = 0.1µF
VIN =V
OUT + ∆V
ILOAD = 150mA
1M
100K
10K
1K
100
0
10
20
30
40
50
60
70
80
90
PSRR (dB)
FREQUENCY (Hz)
Power Supply Rejection Ratio
vs. CBYPASS
CBYP = 1nF
CBYP = 1µF
CBYP = 0.1µF
CBYP = 10nF
CBYP = 0
VIN =V
OUT +1V
ILOAD = 150mA
1K 10K 100K
0
10
20
30
40
50
60
70
80
PSRR (dB)
FREQUENCY (Hz)
Power Supply Rejection Ratio
LDO 2
LDO 3
LDO 1
VIN = VOUT + 1V
CBYP = 0.1µF
ILOAD = 150mA
100 1M
0
20
40
60
80
100
120
140
160
180
200
012345
GROUND CURRENT (µA)
SUPPLY VOLTAGE (V)
Ground Current
vs. Suppl
y
Volta
g
e for LDO 3
100µA
150mA
250mA
VOUT = 3V
MIC2215 Micrel
M9999-042704 8 April 2004
Functional Diagram
General Description
The MIC2215 is a triple, low noise CMOS LDO. Designed
specifically for noise-critical applications in handheld or bat-
tery-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 re-
sponse, all within a small MLF™ package.
VIN1
Current
Limit
EN1
Error
Amp
VIN2
Current
Limit
EN2
Error
Amp
VIN3
Current
Limit
EN3
Error
Amp
Quick-
Start
V
REF
GND
VOUT1
VOUT2
VOUT3
BYP
Thermal
Limit
ADJ1
ADJ2
ADJ3
MIC2215 Block Diagram
(Adjustable)
VIN1
Current
Limit
EN1
Error
Amp
VIN2
Current
Limit
EN2
Error
Amp
VIN3
Current
Limit
EN3
Error
Amp
Quick-
Start
V
REF
GND
VOUT1
VOUT2
VOUT3
BYP
Thermal
Limit
MIC2215 Block Diagram
(Fixed)
The MIC2215 is specifically designed to work with low-ESR
ceramic capacitors, reducing the amount of board space
necessary for power applications, which is critical in hand-
held wireless devices.
April 2004 9 M9999-042704
MIC2215 Micrel
Applications 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 respec-
tive regulator and sends it into a “zero” off-mode-current
state. In this state, current consumed by the individual regu-
lator 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-off-mode-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.
Input Capacitor
The MIC2215 is a high performance, high bandwidth device.
Therefore, it requires a well-bypassed input supply for opti-
mal 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.
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 dielectric-type 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.
Bypass Pin
A capacitor can be placed from the noise bypass pin to
ground to reduce output voltage noise. The capacitor by-
passes 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 ca-
pacitor can be increased, further reducing noise and im-
proving PSRR. Turn-on time increases slightly with respect to
bypass capacitance.
Internal Reference
The internal bandgap, or reference, is powered from the VIN1
input. Due to some of the input noise (PSRR) contributions
being imposed on the bandgap, it is important to make VIN1
as clean as possible with good bypassing close to the input.
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.
Thermal Considerations
The MIC2215 is designed to provide up to 250mA of current
per channel in a very small package. Maximum power dissi-
pation 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-ambi-
ent thermal resistance of the device and the following basic
equation:
PD(max) = (TJ(max) – TA)÷θ
JA
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.
θθ
θθ
θJA Recommended
Package Minimum Footprint
16-Pin 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 mini-
mum footprint layout, the maximum load currents can be
calculated as follows:
PD(max) = (125°C – 60°C)/43 °C/W
PD(max) = 1.511W
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
MIC2215 Micrel
M9999-042704 10 April 2004
PDLDO2 = (VIN2 – VOUT2)×IOUT2
PDLDO2 = (4.2V – 3.0V) ×100mA
PDLDO2 = 120mW
PDLDO3 = (VIN3 – VOUT3)×IOUT3
PDLDO3 = (4.2V – 2.8V) ×50mA
PDLDO3 = 70mW
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. Cal-
culating 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.
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 equa-
tion:
V= V1
R1
R2
OUT REF +
V = 1.25V
REF
OUT1
ADJ1
MIC2215-AAABML
R1
R2
Figure 1. Adjustable Output
April 2004 11 M9999-042704
MIC2215 Micrel
MICREL, INC. 1849 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.
Package Information
16-Pin (4mm ××
××
×4mm) MLF™ (ML)