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MIC5321
Dual, High Performance 150mA Cap ULDOTM
General Description
The MIC5321 is a tiny Dual Ultra Low-Dropout (ULDOTM) linear regulator ideally suited for those applications that require high PSRR because it provides a bypass pin for those noise sensitive portable electronics. The MIC5321 integrates two high-performance; 150mA ULDOs into a very compact 1.6mm x 1.6mm leadless Thin MLF(R) package that provides exceptional thermal package characteristics. The MIC5321 is a Cap design which enables operation with very small ceramic output capacitors for stability, thereby reducing required board space and component cost. The combination of extremely low-drop-out voltage, very high power supply rejection, very low output noise and exceptional thermal package characteristics makes it ideal for powering RF application, cellular phone camera modules, imaging sensors for digital still cameras, PDAs, MP3 players and WebCam applications. The MIC5321 ULDOTM is available in fixed-output voltages in the tiny 6-pin 1.6mm x 1.6mm leadless Thin MLF(R) package which is only 2.56mm2 in area, less than 30% the area of the SOT-23, TSOP and MLF(R) 3x3 packages. It's also available in the thin SOT-23-6 lead package. Additional voltage options are available. For more information, contact Micrel marketing department. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* * * * * * * * * * * * 2.3V to 5.5V input voltage range Ultra-low dropout voltage ULDOTM 35mV @ 150mA Tiny 6-pin 1.6mm x 1.6mm Thin MLF(R) leadless package Low cost TSOT-23-6 package Bypass pin for improved noise performance High PSRR - >75dB on each LDO Ultra low noise output - > 30Vrms Dual 150mA outputs Cap stable with 1F ceramic capacitor Low quiescent current - 150A Fast turn-on time - 45s Thermal shutdown protection Current Limit protection
Applications
* * * * * * Mobile phones PDAs GPS receivers Portable electronics Portable media players Digital still and video cameras
Typical Application
MIC5321-x.xYML VIN VOUT 1 VOUT 2 1F EN BYP 0.01F GND 1F 1F RF Transceiver Rx/Synth Tx
RF Power Supply Circuit
ULDO is a 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 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
January 2007
M9999-012407-C
Micrel, Inc.
MIC5321
Ordering Information
Part number MIC5321-1.8/1.5YMT MIC5321-1.8/1.6YMT MIC5321-2.5/1.8YMT MIC5321-2.5/2.5YMT MIC5321-2.6/1.85YMT MIC5321-2.6/1.8YMT MIC5321-2.7/2.7YMT MIC5321-2.8/1.5YMT MIC5321-2.8/1.8YMT MIC5321-2.8/2.6YMT MIC5321-2.8/2.8YMT MIC5321-2.8/2.85YMT MIC5321-2.85/1.85YMT MIC5321-2.85/2.6YMT MIC5321-2.85/2.85YMT MIC5321-2.9/1.5YMT MIC5321-2.9/1.8YMT MIC5321-2.9/2.9YMT MIC5321-3.0/1.8YMT MIC5321-3.0/2.5YMT MIC5321-3.0/2.6YMT MIC5321-3.0/2.8YMT MIC5321-3.0/2.85YMT MIC5321-3.0/3.0YMT MIC5321-3.3/1.5YMT MIC5321-3.3/1.8YMT MIC5321-3.3/2.5YMT MIC5321-3.3/2.6YMT MIC5321-3.3/2.7YMT MIC5321-3.3/2.8YMT MIC5321-3.3/2.85YMT MIC5321-3.3/2.9YMT MIC5321-3.3/3.0YMT MIC5321-3.3/3.2YMT MIC5321-3.3/3.3YMT Manufacturing Part Number MIC5321-GFYMT MIC5321-GWYMT MIC5321-JGYMT MIC5321-JJYMT MIC5321-KDYMT MIC5321-KGYMT MIC5321-LLYMT MIC5321-MFYMT MIC5321-MGYMT MIC5321-MKYMT MIC5321-MMYMT MIC5321-MNYMT MIC5321-NDYMT MIC5321-NKYMT MIC5321-NNYMT MIC5321-OFYMT MIC5321-OGYMT MIC5321-OOYMT MIC5321-PGYMT MIC5321-PJYMT MIC5321-PKYMT MIC5321-PMYMT MIC5321-PNYMT MIC5321-PPYMT MIC5321-SFYMT MIC5321-SGYMT MIC5321-SJYMT MIC5321-SKYMT MIC5321-SLYMT MIC5321-SMYMT MIC5321-SNYMT MIC5321-SOYMT MIC5321-SPYMT MIC5321-SRYMT MIC5321-SSYMT Marking* BGF BGW BJG BJJ BKD BKG BLL BMF BMG BMK BMM BMN BND BNK BNN BOF BOG BOO BPG BPJ BPK BPM BPN BPP BSF BSG BSJ BSK BSL BSM BSN BSO BSP BSR BSS Voltage 1.8V/1.5V 1.8V/1.6V 2.5V/1.8V 2.5V/2.5V 2.6V/1.85 2.6V/1.8V 2.7V/2.7V 2.8V/1.5V 2.8V/1.8V 2.8V/2.6V 2.8V/2.8V 2.8V/2.85V 2.85V/1.85V 2.85V/2.6V 2.85V/2.85V 2.9V/1.5V 2.9V/1.8V 2.9V/2.9V 3.0V/1.8V 3.0V/2.5V 3.0V/2.6V 3.0V/2.8V 3.0V/2.85V 3.0V/3.0V 3.3V/1.5V 3.3V/1.8V 3.3V/2.5V 3.3V/2.6V 3.3V/2.7V 3.3V/2.8V 3.3V/2.85V 3.3V/2.9V 3.3V/3.0V 3.3V/3.2V 3.3V/3.3V Junction Temp. Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Package 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF 6-Pin 1.6x1.6 Thin MLF
(R)
6-Pin 1.6x1.6 Thin MLF(R)
(R)
6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R) 6-Pin 1.6x1.6 Thin MLF(R)
January 2007
2
M9999-012407-C
Micrel, Inc.
MIC5321
Part number MIC5321-1.8/1.5YD6 MIC5321-1.8/1.6YD6 MIC5321-2.5/1.8YD6 MIC5321-2.5/2.5YD6 MIC5321-2.6/1.85YD6 MIC5321-2.6/1.8YD6 MIC5321-2.7/2.7YD6 MIC5321-2.8/1.5YD6 MIC5321-2.8/1.8YD6 MIC5321-2.8/2.6YD6 MIC5321-2.8/2.8YD6 MIC5321-2.8/2.85YD6 MIC5321-2.85/1.85YD6 MIC5321-2.85/2.6YD6 MIC5321-2.85/2.85YD6 MIC5321-2.9/1.5YD6 MIC5321-2.9/1.8YD6 MIC5321-2.9/2.9YD6 MIC5321-3.0/1.8YD6 MIC5321-3.0/2.5YD6 MIC5321-3.0/2.6YD6 MIC5321-3.0/2.8YD6 MIC5321-3.0/2.85YD6 MIC5321-3.0/3.0YD6 MIC5321-3.3/1.5YD6 MIC5321-3.3/1.8YD6 MIC5321-3.3/2.5YD6 MIC5321-3.3/2.6YD6 MIC5321-3.3/2.7YD6 MIC5321-3.3/2.8YD6 MIC5321-3.3/2.85YD6 MIC5321-3.3/2.9YD6 MIC5321-3.3/3.0YD6 MIC5321-3.3/3.2YD6 MIC5321-3.3/3.3YD6
Note: *
Manufacturing Part Number MIC5321-GFYD6 MIC5321-GWYD6 MIC5321-JGYD6 MIC5321-JJYD6 MIC5321-KDYD6 MIC5321-KGYD6 MIC5321-LLYD6 MIC5321-MFYD6 MIC5321-MGYD6 MIC5321-MKYD6 MIC5321-MMYD6 MIC5321-MNYD6 MIC5321-NDYD6 MIC5321-NKYD6 MIC5321-NNYD6 MIC5321-OFYD6 MIC5321-OGYD6 MIC5321-OOYD6 MIC5321-PGYD6 MIC5321-PJYD6 MIC5321-PKYD6 MIC5321-PMYD6 MIC5321-PNYD6 MIC5321-PPYD6 MIC5321-SFYD6 MIC5321-SGYD6 MIC5321-SJYD6 MIC5321-SKYD6 MIC5321-SLYD6 MIC5321-SMYD6 MIC5321-SNYD6 MIC5321-SOYD6 MIC5321-SPYD6 MIC5321-SRYD6 MIC5321-SSYD6
Marking* QBGF QBGW QBJG QBJJ QBKD QBKG QBLL QBMF QBMG QBMK QBMM QBMN QBND QBNK QBNN QBOF QBOG QBOO QBPG QBPJ QBPK QBPM QBPN QBPP QBSF QBSG QBSJ QBSK QBSL QBSM QBSN QBSO QBSP QBSR QBSS
Voltage 1.8V/1.5V 1.8V/1.6V 2.5V/1.8V 2.5V/2.5V 2.6V/1.85 2.6V/1.8V 2.7V/2.7V 2.8V/1.5V 2.8V/1.8V 2.8V/2.6V 2.8V/2.8V 2.8V/2.85V 2.85V/1.85V 2.85V/2.6V 2.85V/2.85V 2.9V/1.5V 2.9V/1.8V 2.9V/2.9V 3.0V/1.8V 3.0V/2.5V 3.0V/2.6V 3.0V/2.8V 3.0V/2.85V 3.0V/3.0V 3.3V/1.5V 3.3V/1.8V 3.3V/2.5V 3.3V/2.6V 3.3V/2.7V 3.3V/2.8V 3.3V/2.85V 3.3V/2.9V 3.3V/3.0V 3.3V/3.2V 3.3V/3.3V
Junction Temp. Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23 6-Pin TSOT-23
Under bar/Over bar symbol may not be to scale.
** For other voltages available. Contact Micrel Marketing for details.
January 2007
3
M9999-012407-C
Micrel, Inc.
MIC5321
Pin Configuration
VIN 3 VIN 1 GND 2 BYP 3 6 5 4 VOUT1 VOUT2 EN 4 5 6 EN VOUT1 VOUT2 GND 2 BYP 1
6-Pin 1.6mm x 1.6mm Thin MLF (MT) Top View
TSOT-23-6 (D6) Top View
Pin Description
Pin Number Thin MLF-6
1 2 3 4 5 6
Pin Number TSOT-23-6
3 2 1 6 5 4
Pin Name
VIN GND BYP EN VOUT2 VOUT1
Pin Function
Supply Input. Ground Reference Bypass: Connect external 0.01F to GND to reduce output noise. May be left open. Enable Input (both regulators): Active High Input. Logic High = On; Logic Low = Off; Do not leave floating. Regulator Output - LDO2 Regulator Output - LDO1
January 2007
4
M9999-012407-C
Micrel, Inc.
MIC5321
Absolute Maximum Ratings(1)
Supply Voltage (VIN) .....................................0V to +6V Enable Input Voltage (VEN)...........................0V to +6V Power Dissipation......................Internally Limited(3) Lead Temperature (soldering, 3sec) ..................260C Storage Temperature (TS) ................ -65C to +150C ESD Rating(4) .........................................................2kV
Operating Ratings(2)
Supply Voltage (VIN).............................. +2.3V to +5.5V Enable Input Voltage (VEN).............................. 0V to VIN Junction Temperature (TJ) ................. -40C to +125C Junction Thermal Resistance Thin MLF-6 (JA) ..................................... 100C/W TSOT-6 (JA) ........................................... 235C/W
Electrical Characteristics(5)
VIN = EN = VOUT + 1.0V; higher of the two regulator outputs, IOUTLDO1 = IOUTLDO2 = 100A; COUT1 = COUT2 = 1F; CBYP = 0.01F; TJ = 25C, bold values indicate -40C TJ +125C, unless noted.
Parameter
Output Voltage Accuracy Line Regulation Load Regulation Dropout Voltage
(6)
Conditions
Variation from nominal VOUT Variation from nominal VOUT; -40C to +125C VIN = VOUT + 1V to 5.5V; IOUT = 100A IOUT = 100A to 150mA IOUT = 100A IOUT = 50mA IOUT = 100mA IOUT = 150mA
Min
-2.0
Typ
Max
+2.0
Units
% % %/V %/V % mV mV mV mV A A dB dB
-3.0
0.02 0.5 0.1 12 25 35 150 0.01 75 45
+3.0
0.3 0.6
2.0 50 75 100 190 2
Ground Current Ground Current in Shutdown Ripple Rejection Current Limit Output Voltage Noise
EN = High; IOUT1 = 150mA, IOUT2 = 150mA EN1 0.2V f = 1kHz; COUT = 1.0F; CBYP = 0.1F f = 20kHz; COUT = 1.0F; CBYP = 0.1F VOUT = 0V COUT = 1.0F; CBYP = 0.01F; 10Hz to 100kHz Logic Low Logic High
300
550 30
950
mA VRMS
Enable Inputs (EN)
Enable Input Voltage Enable Input Current
0.2 1.1
0.01 0.01 40 45 1 1
V V A A s s
VIL 0.2V VIH 1.0V
Turn-on Time (See Timing Diagram)
Turn-on Time (LDO1 and 2)
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) / JA. 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. Human body model, 1.5k in series with 100pF. 5. Specification for packaged product only. 6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below it's nominal VOUT. For outputs below 2.3V, the dropout voltage is the input-to-output differential with the minimum input voltage 2.3V
COUT = 1.0F; No CBYP COUT = 1.0F; CBYP = 0.01F
100 100
January 2007
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M9999-012407-C
Micrel, Inc.
MIC5321
Functional Diagram
VIN
LDO1
VOUT 1
LDO2 EN Enable
VOUT 2
BYP
Reference
GND
MIC5321 Block Diagram
January 2007
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M9999-012407-C
Micrel, Inc.
MIC5321
Typical Characteristics
-90 -80 -70 -60 -50 -40 -30 V =V +1V 150mA -20 VIN =OUT OUT 2.8V -10 COUT = 1F CBYP = 0.1F 0 0.1 1 10 100 1,000 FREQUENCY (kHz) 50mA
Power Supply Rejection Ratio
40 35 30 25 20 15 10 5 0 0
Dropout Voltage vs. Output Current
3.00 2.95 2.90 2.85 2.80 2.75
Output Voltage vs. Temperature
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F EN = VIN 25 50 75 100 125 150 OUTPUT CURRENT (mA)
2.70 2.65 2.60 2.55 2.50
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F EN = VIN 20 40 60 80 TEMPERATURE (C)
160 155 150 145 140 135 130 125 120
Ground Current vs. Temperature
160 155
Ground Current vs. Temperature
3.0 2.5
Output Voltage vs. Input Voltage
2.8V
100A
150 145 140 135
150mA
2.0 1.5 1.5V
VIN = VOUT + 1V VOUT = 3V COUT = 1F EN = VIN 20 40 60 80 TEMPERATURE (C)
130 125 120
VIN = VOUT + 1V VOUT = 3V COUT = 1F EN = VIN 20 40 60 80 TEMPERATURE (C)
1.0 0.5 0.0 0 IOUT = 100A COUT = 1F 1 2 3 4 5 6 INPUT VOLTAGE (V)
50 VIN = VOUT + 1V 45 VOUT = 2.8V COUT = 1F 40 35 30 25 20 15 10 5 0
Dropout Voltage vs. Temperature
150mA
2.90
Output Voltage vs. Output Current
1.60
Output Voltage vs. Output Current
2.85 100mA 2.80
1.55
1.50 1.45 VIN = VOUT + 1V VOUT = 1.5V COUT1 = COUT2 = 1F EN = VIN 1.40 0 25 50 75 100 125 150 OUTPUT CURRENT (mA)
50mA 10mA 100A
20 40 60 80 TEMPERATURE (C)
2.75 VIN = VOUT + 1V VOUT = 2.8V COUT1 = COUT2 = 1F EN = VIN 2.70 0 25 50 75 100 125 150 OUTPUT CURRENT (mA)
162 158 154 150 146 142 138 0
Ground Current vs. Output Current
610 600 590 580 570 560
Current Limit vs. Input Voltage
10
Output Noise Spectral Density
1
0.1 0.01 VIN = 3.8V VOUT = 2.8V COUT = 1F CBYP = 0.01F 0.001 0.01 0.1 1 10 100 1,000 10,000 FREQUENCY (kHz)
VIN = VOUT + 1V VOUT = 2.85V EN = VIN COUT1 = COUT2 = 1F 25 50 75 100 125 150 OUTPUT CURRENT (mA)
550 540 530 520 510 3
EN = VIN COUT = 1F 3.5 4 4.5 5 INPUT VOLTAGE (V) 5.5
January 2007
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M9999-012407-C
Micrel, Inc.
MIC5321
Functional Characteristics
Enable Turn-On
Load Transient
Enable (1V/div)
Output Voltage (20mV/div)
150mA
VIN = VOUT + 1V VOUT = 2.8V COUT = 1F CBYP = 0.1F
VOUT1 (1V/div)
VIN = VOUT + 1V VOUT2 (1V/div) VOUT1 = VOUT2 = 3.0V COUT = 1F CBYP = 0.1F Time (10s/div)
Output Current (50mA/div)
10mA
Time (40s/div)
Line Transient
5.5V 4V Input Voltage (2V/div) VIN = VOUT + 1V VOUT = 2.8V COUT = 1F IOUT = 10mA
Output Voltage (50mV/div)
Time (40s/div)
January 2007
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M9999-012407-C
Micrel, Inc.
MIC5321
Applications Information
Enable/Shutdown The MIC5321 comes with a single active-high enable pin that allows both regulators to be disabled simultaneously. Forcing the enable pin low disables the regulator and sends it into a "zero" off-modecurrent state. In this state, current consumed by the regulator goes nearly to zero. Forcing the enable pin high enables the output voltage. The active-high enable pin uses CMOS technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output. Input Capacitor The MIC5321 is a high-performance, high bandwidth device. Therefore, it requires a well-bypassed input supply for optimal performance. A 1F capacitor is required from the input to ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional highfrequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out highfrequency noise and are good practice in any RFbased circuit. Output Capacitor The MIC5321 requires an output capacitor of 1F or greater to maintain stability. The design is optimized for use with low-ESR ceramic chip capacitors. High ESR capacitors may cause high frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1F ceramic output capacitor and does not improve significantly with larger capacitance.
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. increased, further reducing noise and improving PSRR. Turn-on time increases slightly with respect to bypass capacitance. A unique, quick-start circuit allows the MIC5321 to drive a large capacitor on the bypass pin without significantly slowing turn-on time. Refer to the Typical Characteristics section for performance with different bypass capacitors.
No-Load Stability Unlike many other voltage regulators, the MIC5321 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The MIC5321 is designed to provide 150mA of continuous current for both outputs in a very small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. Given that the input voltage is 3.3V, the output voltage is 2.8V for VOUT1, 2.5V for VOUT2 and the output current = 150mA. The actual power dissipation of the regulator circuit can be determined using the equation:
PD = (VIN - VOUT1) IOUT1 + (VIN - VOUT2) IOUT2+ VIN IGND Because this device is CMOS and the ground current is typically <150A over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (3.3V - 2.8V) x 150mA + (3.3V -1.5) x 150mA PD = 0.345W To determine the maximum ambient operating temperature of the package, use the junction-toambient thermal resistance of the device and the following basic equation:
PD(MAX) =

TJ(MAX) - TA
JA
TJ(max) = 125C, the maximum junction temperature of the die JA thermal resistance = 100C/W. The table below shows junction-to-ambient thermal resistance for the MIC5321 in the Thin MLF(R) package.
Bypass Capacitor A capacitor can be placed from the noise bypass pin to ground to reduce output voltage noise. The capacitor bypasses the internal reference. A 0.1F capacitor is recommended for applications that require low-noise outputs. The bypass capacitor can be
January 2007 9
M9999-012407-C
Micrel, Inc.
MIC5321
Package
6-Pin 1.6x1.6 Thin MLF
(R)
JA Recommended Minimum Footprint
100C/W
JC
2C/W
For example, when operating the MIC5321-MFYMT at an input voltage of 3.3V and 150mA loads at each output with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: 0.345W = (125C - TA)/(100C/W) TA=90.5C Therefore, a 2.8V/1.5V application with 150mA at each output current can accept an ambient operating temperature of 90.5C in a 1.6mm x 1.6mm Thin MLF(R) package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the "Regulator Thermals" section of Micrel's Designing with Low-Dropout Voltage Regulators handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
Thermal Resistance
Substituting PD for PD(max) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 100C/W. The maximum power dissipation must not be exceeded for proper operation.
January 2007
10
M9999-012407-C
Micrel, Inc.
MIC5321
Package Information
6-Pin 1.6mm x 1.6mm Thin MLF (MT)
6-Pin TSOT-23 (D6)
January 2007
11
M9999-012407-C
Micrel, Inc.
MIC5321
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. (c) 2006 Micrel, Inc.
January 2007
12
M9999-012407-C

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