Features. Applications. V OUT Enable Shutdown

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1 MIC53 μcap 8mA Low-Dropout Regulator General Description The MIC53 is a µcap 8mA linear voltage regulator with very low dropout voltage (typically mv at light loads and 3mV at 8mA) and very low ground current (5µA at ma output), offering better than 3% initial accuracy with a logic-compatible enable input. TheµCap regulator design is optimized to work with lowvalue, low-cost ceramic capacitors. The outputs typically require only.47µf of output capacitance for stability. Designed especially for hand-held, battery-powered devices, the MIC53 can be controlled by a CMOS or TTL compatible logic signal. When disabled, power consumption drops nearly to zero. If on-off control is not required, the enable pin may be tied to the input for 3- terminal operation. The ground current of the MIC53 increases only slightly in dropout, further prolonging battery life. Key MIC53 features include current limiting, overtemperature shutdown, and protection against reversed battery. The MIC53 is available in.8v, 3.V, 3.3V, 3.6V, 3.8V, 4.V, 4.5V, 4.75V, and 5.V fixed voltages. Other voltages are available. Data sheets and support documentation can be found on Micrel s web site at Features Tiny 4- and 5-lead surface-mount packages Wide selection of output voltages Guaranteed 8mA output Low quiescent current Low dropout voltage Low temperature coefficient Current and thermal limiting Reversed input polarity protection Zero off-mode current Logic-controlled shutdown Stability with low-esr ceramic capacitors Applications Cellular telephones Laptop, notebook, and palmtop computers Battery-powered equipment Barcode scanners SMPS post-regulator/dc-to-dc modules High-efficiency linear power supplies Typical Application Enable Shutdown LAxx V OUT.47µF Enable Shutdown V OUT.47µF SOT-43 Version SOT-3-5 Version Micrel Inc. 8 Fortune Drive San Jose, CA 953 USA tel + (48) fax + (48) November 9 M

2 MIC53 Ordering Information () Part Number Standard Marking Pb-Free Marking Voltage Temperature Range Package MIC53-.6BM4 LA6 MIC53-.6YM4 LA6.6V 4 to +5 C SOT-43 MIC53-.8BM4 LA8 MIC53-.8YM4 LA8.8V 4 to +5 C SOT-43 MIC53-3.BM4 LA3 MIC53-3.YM4 LA3 3.V 4 to +5 C SOT-43 MIC53-3.3BM4 LA33 MIC53-3.3YM4 LA33 3.3V 4 to +5 C SOT-43 MIC53-3.6BM4 LA36 MIC53-3.6YM4 LA36 3.6V 4 to +5 C SOT-43 MIC53-3.8BM4 LA38 MIC53-3.8YM4 LA38 3.8V 4 to +5 C SOT-43 MIC53-4.BM4 LA4 MIC53-4.YM4 LA4 4.V 4 to +5 C SOT-43 MIC53-4.5BM4 LA45 MIC53-4.5YM4 LA45 4.5V 4 to +5 C SOT-43 MIC53-4.7BM4 LA47 MIC53-4.7YM4 LA47 4.7V 4 to +5 C SOT-43 MIC53-5.BM4 LA5 MIC53-5.YM4 LA5 5.V 4 to +5 C SOT-43 MIC53-.6BM5 LK6 MIC53-.6YM5 LK6.6V 4 to +5 C SOT-3-5 MIC53-.8BM5 LK8 MIC53-.8YM5 LK8.8V 4 to +5 C SOT-3-5 MIC53-3.BM5 LK3 MIC53-3.YM5 LK3 3.V 4 to +5 C SOT-3-5 MIC53-3.3BM5 LK33 MIC53-3.3YM5 LK33 3.3V 4 to +5 C SOT-3-5 MIC53-3.6BM5 LK36 MIC53-3.6YM5 LK36 3.6V 4 to +5 C SOT-3-5 MIC53-3.8BM5 LK38 MIC53-3.8YM5 LK38 3.8V 4 to +5 C SOT-3-5 MIC53-4.BM5 LK4 MIC53-4.YM5 LK4 4.V 4 to +5 C SOT-3-5 MIC53-4.5BM5 LK45 MIC53-4.5YM5 LK45 4.5V 4 to +5 C SOT-3-5 MIC53-4.7BM5 LK47 MIC53-4.7YM5 LK47 4.7V 4 to +5 C SOT-3-5 MIC53-5.BM5 LK5 MIC53-5.YM5 LK5 5.V 4 to +5 C SOT-3-5 Note:. Other Voltage available. Contact Micrel for details. November 9 M

3 MIC53 Pin Configuration Part Identification EN GND LAxx 3 4 IN OUT SOT-43 (M4) EN GND IN 3 LKxx 4 5 NC OUT SOT-3-5 (M5) Pin Description Pin Number SOT-43 Pin Number SOT-3-5 Pin Name Pin Name GND Ground. 3 EN 3 IN Supply input. 4 NC Not internally connected. 4 5 OUT Regulator output. Enable (Input): TTL/CMOS compatible control input. Logic high = enabled; logic low or open = shutdown. November 9 3 M

4 Absolute Maximum Ratings () Supply Voltage (V IN )... V to +V Enable Input Voltage (V EN )... V to +V Power Dissipation (P D )...Internally Limited Storage Temperature (Ts)... 6 C to +5 C Lead Temperature (soldering, #sec.)... 6 C Operating Ratings () MIC53 Input Voltage (V IN )....5V to 6V Enable Input Voltage (V EN )... V to V IN Junction Temperature Range... 4 C to +5 C Thermal Resistance (θ JA )...Note 3 Electrical Characteristics V IN = V OUT + V; ; C L =.47μF; V EN.V; T J = 5 C, bold values indicate 4 C T J +5 C, unless noted. Symbol Parameter Condition Min Typ Max Units 3 3 V O Output voltage accuracy % 4 4 Output voltage temperature V O / T Note 4 5 pm/ C coefficient V O /V O Line regulation V IN = V OUT + V to 6V V O /V O Load regulation I L =.ma to 8mA (5).5 V O V O Dropout voltage (6) I L = μa I L = ma 35 I L = 5mA 5 I L = 8mA 3 6 I Q Quiescent current V EN.4V (shutdown). μa I GND Ground pin current (7) I L = μa, V EN.V (active) 8 I L = ma, V EN.V (active) 5 75 I L = 5mA, V EN.V (active) 85 I L = 8mA, V EN.V (active) 8 3 I GNDDO Ground pin current at dropout V IN = V OUT(nominal).5V (7) 3 μa I LIMIT Current limit V OUT = V 8 5 ma V O/ P D Thermal regulation Note 8.5 %/W.5 % % mv μa November 9 4 M

5 MIC53 Electrical Characteristics (continued) V IN = V OUT + V; ; C L =.47μF; V EN.V; T J = 5 C, bold values indicate 4 C T J +5 C, unless noted. Symbol Parameter Condition Min Typ Max Units Enable Input V IL Logic low (off).6 Enable input voltage level Logic high (on). V IH I IL V IL.6V. Enable input current V IH.V 5 5 I IH Notes:. Exceeding the absolute maximum rating may damage the device.. The device is not guaranteed to function outside its operating rating. 3. The maximum allowable power dissipation at any T A (ambient temperature) is P D(MAX) = (T J(MAX) T A ) θ JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. The θ JA is 5 C/W for the SOT-43 and C/W for the SOT-3-5 mounted on a printed circuit board. 4. Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range. 5. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from.ma to 5mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. 6. Dropout voltage is defined as the input-to-output differential at which the output voltage drops % below its nominal value measured at V differential. 7. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load current plus the ground pin current. 8. Thermal regulation is defined as the change in output voltage at a time t after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 5mA load pulse at V IN = 6V for t = ms. V μa November 9 5 M

6 MIC53 Typical Characteristics DROPOUT VOLTAGE (mv) Dropout Voltage vs. Output Current C IN = F.. OUTPUT CURRENT (ma) DROPOUT VOLTAGE (mv) 4 3 Dropout Voltage C IN = F I L = 8mA I L = A OUTPUT VOLTAGE (V) 4 3 Dropout Characteristics I L = A I L = 8mA C IN = F SUPPLY VOLTAGE (V) G ROUND CURRENT ( A ) 5 5 Ground Current vs. Output Current V IN = V OUT + V OUTPUT CURRENT (ma) GROUND CURRENT (ma) Ground Current vs. Supply Voltage I L = 5mA I L = A V OUT = 3.3V SUPPLY VOLTAGE (V) GROUND CURRENT (ma) Ground Current C IN = F I L = 8mA I L = 5mA I L = A OUTPUT VOLTAGE (V) Output Voltage vs. Output Current C IN = F. 5 5 OUTPUT CURRENT (ma) SHORT CIRCUIT CURRENT (ma) Short Circuit Current vs. Input Voltage C IN = F INPUT VOLTAGE (V) OUTPUT (mv) LOAD (ma) Thermal Regulation (3.3V Version) C L = F OUTPUT VOLTAGE (V) Output Voltage C IN = F DEVICES.8 HI / AVG / LO.6 CURVES APPLICABLE AT A AND 5mA OUTPUT CURRENT (ma) Short Circuit Current C IN = F SUPPLY VOLTAGE (V) MIN Minimum Supply Voltage V OUT = 3.3V C IN = F November 9 6 M

7 MIC53 Typical Characteristics (continued) OUTPUT (mv) OUTPUT (ma) Load Transient V IN = V OUT OUTPUT (mv) OUTPUT (ma) Load Transient V IN = V OUT OUTPUT (V) INPUT (V) Line Transient C L = F OUTPUT (V) INPUT (V) Line Transient C L = F RIPPLE VOLTAGE (db) Ripple Voltage vs. Frequency I L = A C L = F V IN = V OUT + RIPPLE VOLTAGE (db) Ripple Voltage vs. Frequency C L = F V IN = V OUT x x 3 x 3 x 3 x FREQUENCY (Hz) 6 x x x 3 x 3 x 3 x FREQUENCY (Hz) 6 x RIPPLE VOLTAGE (db) Ripple Voltage vs. Frequency I L = 5mA C L = F V IN = V OUT + O UTPUT IMPEDANCE ( ). Output Impedance I L = A OUTPUT (V) ENABLE (V) Enable Characteristics (3.3V Version) C L = F I L = A x x 3 x 3 x 3 x FREQUENCY (Hz) 6 x. x x x 3 x 3 x FREQUENCY (Hz) 3 x 6 x OUTPUT (V) ENABLE (V) Enable Characteristics (3.3V Version) C L = F I L = A TIME ( s) ENABLE VOLTAGE (mv) Enable Voltage VOFF C IN = F V ON E NABLE CURRENT ( A ) 4 3 Enable Current V EN = V C IN = F V EN = 5V November 9 7 M

8 MIC53 Applications Information Input Capacitor A.µF capacitor should be placed from IN to GND if there is more than inches of wire between the input and the AC filter capacitor or when a battery is used as the input. Output Capacitor Typical PNP based regulators require an output capacitor to prevent oscillation. The MIC53 is ultrastable, requiring only.47µf of output capacitance for stability. The regulator is stable with all types of capacitors, including the tiny, low-esr ceramic chip capacitors. The output capacitor value can be increased without limit to improve transient response. The capacitor should have a resonant frequency above 5kHz. Ceramic capacitors work, but some dielectrics have poor temperature coefficients, which will affect the value of the output capacitor over temperature. Tantalum capacitors are much more stable over temperature, but typically are larger and more expensive. Aluminum electrolytic capacitors will also work, but they have electrolytes that freeze at about 3 C. Tantalum or ceramic capacitors are recommended for operation below 5 C. No-Load Stability The MIC53 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Enable Input The MIC53 features nearly zero off-mode current. When EN (enable input) is held below.6v, all internal circuitry is powered off. Pulling EN high (over.v) reenables the device and allows operation. EN draws a small amount of current, typically 5µA. While the logic threshold is TTL/CMOS compatible, EN may be pulled as high as V, independent of V IN. November 9 8 M

9 MIC53 Package Information SOT-43 (M4) November 9 9 M

10 MIC53 Package Information (continued) SOT-3-5 (M5) MICREL, INC. 8 FORTUNE DRIVE SAN JOSE, CA 953 USA TEL + (48) FAX + (48) 474- WEB 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. 998 Micrel, Incorporated. November 9 M

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