MIC2214-DKYML-TR [MICROCHIP]
DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO10;
| 型号： | MIC2214-DKYML-TR |
| 厂家： | 
MICROCHIP |
| 描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO10 光电二极管 输出元件 调节器 |
| 文件： | 总11页 (文件大小：883K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC2214
Portable Power Management IC
General Description
Features
The MIC2214 is a dual µCap low dropout regulator with an
open-draindriverandpower-onresetcircuit.Thefirstregulator
iscapableofsourcing150mA,whilethesecondregulatorcan
source up to 300mAand includes a power-on reset function.
The open-drain output is capable of sinking 150mA for LED
backlighting applications.
• Input voltage range: 2.25V to 5.5V
• Stable with ceramic output capacitor
• 2 LDO outputs
• Output 1 – 150mA output current
• Output 2 – 300mA output current
• 1 Open-drain driver
• Power-on reset function with adjustable delay time
• Low dropout voltage of 80mV @ 100mA
• Ultra-low quiescent current of 48µA
• High output accuracy:
• +1.0% initial accuracy
• +2.0% over temperature
• Thermal shutdown protection
• Current limit protection
• Tiny 3mm × 3mm MLF™-10 package
Idealforbatteryoperatedapplications,theMIC2214offers1%
accuracy, extremely low dropout voltage (80mV @ 100mA),
and extremely low ground current, only 48µAtotal. Equipped
with a TTL-logic-compatible enable pin, the MIC2214 can be
put into a zero-off-mode current state, drawing no current
when disabled.
The MIC2214 is a µCap design, operating with very small
ceramic output capacitors for stability, reducing required
board space and component cost.
Applications
• Cellular/PCS phones
• Wireless modems
• PDAs
The MIC2214 is available in fixed output voltages in the
10-pin 3mm × 3mm MLF™ leadless package and is also
available with adjustable output voltages in the 4mm × 4mm
16-pin MLF™ package.
Typical Application
100kΩ
MIC2214-xxBML
VIN
1µF
VIN
VOUT1
VOUT2
POR
VANALOG
OFF
OFF
ON
ON
EN
VDIGITAL
VCORE
CBYP
SW
/RST
Baseband
Processor
0.01µF
DRV
1µF
Ceramic
MEMORY
SET
Keyboard Backlighting LED
CDELAY
GND
MIC2214 Typical Cellphone Application
MicroLeadFrame and MLF are trademarks of Amkor Technology.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2005
1
M9999-101705
MIC2214
Micrel, Inc.
Ordering Information
Part Number
Voltage*
Junction
Full Number
Manufacturing
Pb-Free
(Vo1/Vo2)
Temp. Range
Package
MIC2214-1.5/2.8BML
MIC2214-1.6/2.8BML
MIC2214-1.6/3.0BML
MIC2214-1.6/3.3BML
MIC2214-1.8/2.6BML
MIC2214-1.8/2.7BML
MIC2214-1.8/2.8BML
MIC2214-1.8/2.9BML
MIC2214-1.8/3.0BML
MIC2214-1.8/3.3BML
MIC2214-1.85/2.65BML
MIC2214-1.85/2.6BML
MIC2214-1.85/2.7BML
MIC2214-1.85/2.85BML
MIC2214-1.85/2.9BML
MIC2214-2.5/1.8BML
MIC2214-2.5/2.8BML
MIC2214-2.5/3.0BML
MIC2214-2.5/3.1BML
MIC2214-2.6/2.6BML
MIC2214-2.6/2.85BML
MIC2214-2.6/2.8BML
MIC2214-2.6/3.0BML
MIC2214-2.7/2.8BML
MIC2214-2.7/3.0BML
MIC2214-2.8/2.8BML
MIC2214-2.8/3.0BML
MIC2214-2.85/2.85BML
MIC2214-3.0/1.6BML
MIC2214-3.0/2.85BML
MIC2214-3.0/2.8BML
MIC2214-3.0/3.3BML
MIC2214-3.3/1.6BML
MIC2214-3.3/1.8BML
MIC2214-3.3/2.8BML
MIC2214-Adj/AdjBML
MIC2214-FMBML
MIC2214-WMBML
MIC2214-WPBML
MIC2214-WSBML
MIC2214-GKBML
MIC2214-GLBML
MIC2214-GMBML
MIC2214-GOBML
MIC2214-GPBML
MIC2214-GSBML
MIC2214-DIBML
MIC2214-DKBML
MIC2214-DLBML
MIC2214-DNBML
MIC2214-DOBML
MIC2214-JGBML
MIC2214-JMBML
MIC2214-JPBML
MIC2214-JQBML
MIC2214-KKBML
MIC2214-KNBML
MIC2214-KMBML
MIC2214-KPBML
MIC2214-LMBML
MIC2214-LPBML
MIC2214-MMBML
MIC2214-MPBML
MIC2214-NNBML
MIC2214-PWBML
MIC2214-PNBML
MIC2214-PMBML
MIC2214-PSBML
MIC2214-SWBML
MIC2214-SGBML
MIC2214-SMBML
MIC2214-AABML
MIC2214-FMYML
MIC2214-WMYML
MIC2214-WPYML
MIC2214-WSYML
MIC2214-GKYML
MIC2214-GLYML
MIC2214-GMYML
MIC2214-GOYML
MIC2214-GPYML
MIC2214-GSYML
MIC2214-DIYML
MIC2214-DKYML
MIC2214-DLYML
MIC2214-DNYML
MIC2214-DOYML
MIC2214-JGYML
MIC2214-JMYML
MIC2214-JPYML
MIC2214-JQYML
MIC2214-KKYML
MIC2214-KNYML
MIC2214-KMYML
MIC2214-KPYML
MIC2214-LMYML
MIC2214-LPYML
MIC2214-MMYML
MIC2214-MPYML
MIC2214-NNYML
MIC2214-PWYML
MIC2214-PNYML
MIC2214-PMYML
MIC2214-PSYML
MIC2214-SWYML
MIC2214-SGYML
MIC2214-SMYML
MIC2214-AAYML
1.5V/2.8V
1.6V/2.8V
1.6V/3.0V
1.6V/3.3V
1.8V/2.6V
1.8V/2.7V
1.8V/2.8V
1.8V/2.9V
1.8V/3.0V
1.8V/3.3V
1.85V/2.65V
1.85V/2.6V
1.85V/2.7V
1.85V/2.85V
1.85V/2.9V
2.5V/1.8V
2.5V/2.8V
2.5V/3.0V
2.5V/3.1V
2.6V/2.6V
2.6V/2.85V
2.6V/2.8V
2.6V/3.0V
2.7V/2.8V
2.7V/3.0V
2.8V/2.8V
2.8V/3.0V
2.85V/2.85V
3.0V/1.6V
3.0V/2.85V
3.0V/2.8V
3.0V/3.3V
3.3V/1.6V
3.3V/1.8V
3.3V/2.8V
Adj/Adj
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
10-Pin 3x3 MLF™
16-Pin 4x4 MLF™
* Contact factory regarding availability for voltages not listed
Voltage
Adj
Code
Voltage
2.7
Code
L
A
F
W
G
D
Y
H
E
J
1.5
2.8
M
N
1.6
2.850
2.9
1.8
O
P
1.85
1.9
3.0
3.1
Q
R
2.0
3.2
2.1
3.3
S
2.5
3.4
T
2.6
K
I
3.5
U
2.65
3.6
V
Table 1. Voltage Codes
M9999-101705
2
October 2005
MIC2214
Micrel, Inc.
Pin Configuration
16
15 14
13
EN1 1
EN2
12 POR
DRV
2
11
10 VOUT1
9 VOUT2
8 POR
VIN
EN
1
2
3
4
5
BYP 3
10 ADJ
BYP
SW
ADJ1 4
9 NGND
7 DRV
5
8
6
7
6 GND
SET
10-Pin 3mm × 3mm MLF™ (ML)
16-Pin 4mm × 4mm MLF™ (ML)
(Top View)
Pin Description
Pin Number
Pin Number
Pin Name
Pin Function
Supply Input: (VIN1 and VIN2 are internally tied together)
MLF-10 (3x3)
MLF-16 (4x4)
1
2
15, 16
–
VIN
EN
Enable Input: Enables both regulator outputs. Active High. High = on, low =
off. Do not leave floating.
–
–
3
1
2
3
EN1
EN2
Enable Input to Regulator 1: Enables regulator 1 output. Active high input.
High = on, low = off. Do not leave floating.
Enable Input to Regulator 2: Enables regulator 2 output. Active high input.
High = on, low = off. Do not leave floating.
CBYP
Reference Bypass: Connect external 0.01µF to GND to reduce output noise.
May be left open.
4
–
5
4
SW
Active high signal drives open-drain N-Channel MOSFET.
ADJ1
Adjust Input (Regulator 1): Connect feedback resistors to program the out-
put voltage for the regulator.
5
6
SET
Delay Set Input: Connect external capacitor to GND to set the internal delay
for the POR output. When left open, there is no delay. This pin cannot be
grounded.
6
–
7,8
9
GND
Ground: Connect externally to exposed pad.
NGND
Ground for the open-drain driver. Tied to the source of the NMOSFET. Tied
to GND internally.
–
10
ADJ2
Adjust Input (Regulator 2): Connect feedback resistors to program the out-
put voltage for the regulator.
7
8
11
12
DRV
POR
Open-Drain Output: Capable of sinking 150mA.
Power-On Reset Output: Open-drain output. Active low indicates an output
undervoltage condition on regulator 2.
9
13
14
EP
VOUT2
VOUT1
GND
Output of Regulator 2: 300mA output current
Output of Regulator 1: 150mA output current
10
EP
Ground: Internally connected to the exposed pad. Connect externally to
ground pin.
October 2005
3
M9999-101705
MIC2214
Micrel, Inc.
Absolute Maximum Rating (Note 1)
Operating Ratings (Note 2)
Supply Input Voltage (V )......................................0V to 7V
Supply Input Voltage (V )..............................2.25V to 5.5V
IN
IN
Enable Input Voltage (V ) ....................................0V to 7V
Enable Input Voltage (V ) ...................................0V to Vin
EN
EN
Power Dissipation (P )................ Internally Limited, Note 3
Junction Temperature (T )........................ –40°C to +125°C
D
J
Junction Temperature............................... –40°C to +125°C
Package Thermal Resistance
MLF™-10 (θ ) 1" square 2 oz. copper...............60°C/W
Storage Temperature (T ) .......................... –65°C to 150°C
JA
S
Open-Drain Output (DRV) ........................................ 250mA
Lead Temperature (soldering, 5 sec.)........................ 260°C
Electrical Characteristics (Note 4)
VIN = VOUT +1.0V for higher output of the regulator pair; COUT = 1.0µF, IOUT = 100µA; TJ = 25°C, bold values indicate
–40°C ≤ TJ ≤ +125°C; unless noted.
Parameter
Conditions
Min
Typ
Max
Units
Output Voltage Accuracy
Variation from nominal VOUT
–1.0
–2.0
+1.0
+2.0
%
%
Output Voltage Temp. Coefficient
40
ppm/C
%/V
Line Regulation; Note 5
VIN = VOUT +1V to 5.5V
–0.3
0.02
0.3
–0.6
0.6
Load Regulation
IOUT = 100µA to 150mA (Regulator 1 and 2)
0.2
1.0
1.5
%
IOUT = 100µA to 300mA (Regulator 2)
%
Dropout Voltage; Note 6
IOUT = 150mA (Regulator 1 and 2)
IOUT = 300mA (Regulator 2)
IOUT1 = IOUT2 = 0µA
120
240
48
190
250
mV
mV
340
420
mV
Ground Pin Current
65
80
µA
µA
IOUT1 = 150mA & IOUT2 = 300mA
VEN ≤ 0.4V
60
µA
µA
Ground Pin Current in Shutdown
Ripple Rejection
2.0
f = 1kHz; COUT = 1.0µF ceramic; CBYP = 10nF
f = 20kHz; COUT = 1.0µF ceramic; CBYP = 10nF
VOUT = 0V (Regulator 1)
60
40
dB
dB
Current Limit
150
300
280
450
30
460
700
mA
VOUT = 0V (Regulator 2)
mA
Output Voltage Noise
COUT =1µF, CBYP =0.01µF, 10Hz to 100kHz
µVrms
Enable Input
Enable Input Voltage
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
VIL < 0.6V (Regulator Shutdown)
VIH > 1.8V (Regulator Enabled)
0.6
V
1.8
–1
–1
V
Enable Input Current
0.01
0.01
+1
+1
µA
µA
POR Output
VTH
Low Threshold, % of nominal VOUT2 (Flag ON)
High Threshold, % of nominal VOUT2 (Flag OFF)
POR output logic low voltage; IL = 250µA
Flag leakage current, flag OFF
90
–1
%
%
V
96
0.1
+1
VOL
0.02
0.01
IPOR
µA
M9999-101705
4
October 2005
MIC2214
Micrel, Inc.
Parameter
Conditions
Min
Typ
Max
Units
DRV Output
Voltage Low
IDRV = 150mA
0.2
0.5
V
0.6
Leakage Current
SW Input Voltage
IDRV = 0mA, VDRV = 5.5V, SW = 0V
Logic Low (DRV shutdown)
Logic High (DRV enabled)
VIL < 0.6V (DRV shutdown)
VIH > 1.8V (DRV enabled)
–1
0.01
+1
µA
V
0.6
1.8
–1
–1
V
SW Input Current
0.01
0.01
+1
+1
µA
µA
SET Input
SET Pin Current Source
SET Pin Threshold Voltage
VSET = 0V
0.75
1.25
1.25
1.75
µA
V
POR = High
Note 1. Exceeding maximum rating may damage the device.
Note 2. The device is not guaranteed to work outside its operating rating.
Note 3. The maximum allowable power dissipation of any TA (ambient temperature) is (PD(max) = TJ(max) – TA) / θJA. Exceeding the maximum allow-
able power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
Note 4. Specification for packaged product only.
Note 5. Minimum input for line regulation test is set to VOUT + 1V relative to the highest output voltage.
Note 6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential. For outputs below 2.25V, dropout voltage is the input-to-output voltage differential with the minimum input voltage 2.25V. Minimum
input operating voltage is 2.25V.
October 2005
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M9999-101705
MIC2214
Micrel, Inc.
Typical Characteristics
Spectral Noise
Density Output 1
PSRR Output 1
PSRR Output 2
80
80
60
40
20
0
10E-6
1E-6
CBYP = 100nF
100µA Load
CBYP = 100nF
CBYP = 10nF
CBYP = 10nF
60
CBYP = 1nF
CBYP = 1nF
40
100E-9
COUT = 1µF
CIN = 1µF
CBYP = 0.01µF
20
VIN = VOUT + 1
VIN = VOUT + 1
IOUT = 300mA
COUT = 1µF
IOUT = 150mA
COUT = 1µF
0
10E-9
0.01 0.1
1
10
100 1000
0.01 0.1
1
10
100 1000
10
100 1k
10k 100k 1M
FREQUENCY (kHz)
FREQUENCY (kHz)
FREQUENCY (Hz)
Dropout Characteristics
Output 2
Dropout Characteristics
Output 1
Spectral Noise
Density Output 2
3
2.5
2
3
2.5
2
10E-6
1E-6
100µA Load
100µA
300mA
100µA
150mA
1.5
1
1.5
1
100E-9
COUT = 1µF
CIN = 1µF
CBYP = 0.01µF
0.5
0
0.5
0
10E-9
0
1
2
3
4
5
0
1
2
3
4
5
10
100 1k
10k 100k 1M
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
FREQUENCY (Hz)
Ground Current
vs. Supply Voltage
Dropout Voltage
Output 2
Dropout Voltage
Output 1
60
50
40
30
20
10
0
150
100
50
350
300
250
200
150
100
50
Output 1 and 2
with 100µA load
150mA load
300mA load
0
0
0
1
2
3
4
5
6
-40 -20
0 20 40 60 80 100120140
TEMPERATURE (°C)
-40 -20
0 20 40 60 80 100120140
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
Ground Current
vs. Output 1 Current
Ground Current
vs. Output 2 Current
Ground Pin Current
60
50
40
30
20
10
0
60
50
40
30
20
10
0
60
50
40
30
20
10
0
1mA
100
µA
0µA
Load on both outputs
TEMPERATURE (°C)
0
20 40 60 80 100 120 140
0
50 100 150 200 250 300
OUTPUT 1 LOAD CURRENT (mA)
OUTPUT 2 LOAD CURRENT (mA)
M9999-101705
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October 2005
MIC2214
Micrel, Inc.
Typical Characteristics (cont.)
Output Voltage 1
vs. Temperature
Output Voltage
vs. Load Current
2.610
Output Voltage
vs. Load Current
3.15
3.10
3.05
3.00
2.95
2.90
2.85
2.870
2.865
2.860
2.855
2.850
2.845
2.840
2.835
2.830
2.825
2.820
100µA load
2.605
2.600
2.595
2.590
2.585
2.580
-40 -20
0
20 40 60 80 100120140
0
25 50 75 100 125 150
0
50 100 150 200 250 300
TEMPERATURE (°C)
OUTPUT 1 LOAD CURRENT (mA)
OUTPUT 2 LOAD CURRENT (mA)
Enable Voltage Threshold
vs. Supply Voltage
Output Voltage 2
vs. Temperature
Switch Threshold
vs. Supply Voltage
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
1.20
1.00
0.80
0.60
0.40
0.20
0.00
Drive Current = 1mA
100µA load
2.25 2.75 3.25 3.75 4.25 4.75 5.25
SUPPLY VOLTAGE (V)
-40 -20
0 20 40 60 80 100120140
TEMPERATURE (°C)
2.25 2.75 3.25 3.75 4.25 4.75 5.25
SUPPLY VOLTAGE (V)
POR Delay
10M
1M
100k
10k
1k
100
10
C
= 1µF
IN
COUT = 1µF
I
LOAD = 100µA
1
100
10k 100k 1M
1k
1
10
POR SETTING CAP (pF)
October 2005
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M9999-101705
MIC2214
Micrel, Inc.
Functional Characteristics
Enable Characteristics
Power-On Reset Characteristics
CIN = 1µF
COUT = 1µF Ceramic
CSET = 0.01µF
CBYP = 0.01µF
VIN = 5V
CIN = 1µF
COUT = 1µF Ceramic
CBYP = 0.01µF
VIN = 5V
Time (100µs/div)
Time (2ms/div)
LoadTransient Response (LDO 1)
LoadTransient Response (LDO 2)
300mA
150mA
100µA
100µA
CIN = 1µF
CIN = 1µF
COUT = 1µF
CBYP = 0.01µF
VIN =VOUT +1V
COUT = 1µF
CBYP = 0.01µF
VIN =VOUT +1V
Time (4µs/div)
Time (4µs/div)
M9999-101705
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October 2005
MIC2214
Micrel, Inc.
Functional Diagram
VIN
EN
OUT1
LDO1
OUT2
POR
LDO2
POR & Delay
SET
DRV
CBYP
SW
Reference
SW Logic
GND
NGND
MIC2214 Fixed Voltage Block Diagram
VIN1
EN1
OUT1
ADJ1
LDO1
VIN2
EN2
OUT2
ADJ2
LDO2
SET
POR
DRV
POR & Delay
Quickstart�
Reference
CBYP
SW
SW Logic
GND
NGND
MIC2214 Adjustable Voltage Block Diagram
Power-On Reset (POR)
Functional Description
The power-on reset output is an open-drain N-Channel de-
vice, requiring a pull-up resistor to either the input voltage
or output voltage for proper voltage levels. The POR output
has a delay time that is programmable with a capacitor from
the SET pin to ground. The delay time can be programmed
to be as long as 1 second.
The MIC2214 is a high performance, low quiescent current
power management IC consisting of two µCap low dropout
regulators, a power-on reset (POR) circuit and an open-drain
driver.Thefirstregulatoriscapableofsourcing150mAatout-
putvoltagesfrom1.25Vto5V.Thesecondregulatoriscapable
of sourcing 300mA of current at output voltages from 1.25V
to 5V. The second regulator has a POR circuit that monitors
its output voltage and indicates when the output voltage is
within 5% of nominal. The POR offers a delay time that is
externallyprogrammablewithasinglecapacitortoground.An
open-draindrivercompletesthepowermanagementchipset,
offeringthecapability ofdrivingLEDsforkeypadbacklighting
in applications such as cellphones.
The SET pin is a current source output that charges a ca-
pacitor that sets the delay time for the power-on reset output.
The current source is a 1µA current source that charges a
capacitor up from 0V. When the capacitor reaches 1.25V, the
output of the POR is allowed to go high.
Open-Drain Driver (DRV)
Thedrive(DRV)pinisanopen-drainoutputcapableofsinking
150mA of current. This output is controlled by a logic level
input, the switch (SW) pin. The switch pin is an active high
input and cannot be left floating.
Enable
The enable input allows for logic control of both output volt-
ages with one enable input. The enable input is active high,
requiring 1.8V for guaranteed operation. The enable input is
CMOS logic and cannot by left floating.
October 2005
9
M9999-101705
MIC2214
Micrel, Inc.
Input Capacitor
Adjustable Regulator Design
Good bypassing is recommended from input to ground to
help improve AC performance. A 1µF capacitor or greater
located close to the IC is recommended.
VOUT1
R1
VOUT2
ADJ2
R1
ADJ1
Bypass Capacitor
The internal reference voltage of the MIC2214 can be by-
passed with a capacitor to ground to reduce output noise and
increasepowersupplyrejection(PSRR).Aquick-startfeature
allows for quick turn-on of the output voltage regardless of
the size of the capacitor. The recommended nominal bypass
capacitor is 0.01µF, but it can be increased without limit.
R2
R2
GND
MIC2214 Adjustable Regulator Design
The MIC2214 allows the programming of the output voltages
1 and 2 anywhere between 1.25V and 5.5V, the maximum
operatingratingofthepart.Tworesistorsarerequiredforeach
output. Appropriate resistor values are required to prevent
the low quiescent current performance being compromised.
Resistor values recommended are between 100kΩ and
500kΩ.
Output Capacitor
Each regulator output requires a 1µF ceramic output capaci-
tor for stability. The output capacitor value can be increased
to improve transient response, but performance has been
optimized for a 1µF ceramic type output capacitor.
X7R/X5R dielectric-type ceramic capacitors are recom-
mendedbecauseoftheirtemperatureperformance.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 operat-
ing 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.
The resistor values are calculated by:
V
OUT
R1 = R2
– 1
1.250
where V
is the desired output voltage. Calculate sepa-
OUT
rately for each output.
M9999-101705
10
October 2005
MIC2214
Micrel, Inc.
Package Information
10-Lead MLF™ (ML)
16-Lead 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
This 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.
© 2003 Micrel, Incorporated.
October 2005
11
M9999-101705
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