LTC3026 LINER [Linear Technology], LTC3026 Datasheet
LTC3026
Available stocks
Related parts for LTC3026
LTC3026 Summary of contents
Page 1
... LDOs. A user supplied boost voltage can be used eliminating the need for an inductor altogether. The LTC3026 regulator is stable with 10µF or greater ceramic output capacitors. The device has a low 0.4V reference voltage which is used to program the output voltage via two external resistors. The device also has internal current limit, overtemperature shutdown, and reverse output current protection ...
Page 2
... SHDN 0mA 1.2V OUT OUT SHDN 0V 3.5V SHDN SHDN IN V < 1. ≥ 1.4V IN ORDER PART NUMBER 10 OUT LTC3026EMSE 9 OUT 11 8 ADJ SHDN MSE PART MARKING = 40°C/W JA LTBJB = 25°C. A MIN TYP MAX ● 1.14 3.5 = 1.2V 1160 = 1.5V 950 = 2.5V 640 = 3.5V 400 ● ...
Page 3
... V IN OUT(MIN) DROPOUT Note 3: When using BST to drive loads other than LTC3026s, the load must be high impedance during start-up (i.e. prior to PG going high). Note 4: PG threshold expressed as a percentage difference from the “V Regulation Voltage” as given in the table. (BOOST DISABLED 1µ ...
Page 4
... LTC3026 W U TYPICAL PERFOR A CE CHARACTERISTICS IN Supply Current with Boost Converter Enabled 1.50 1.25 1.00 0.75 0.50 – 40°C 0.25 25°C 85°C 0 1.0 1.5 2.0 2.5 3.0 3.5 V (V) IN 3026 G01 ADJ Voltage vs Temperature 404 403 402 401 1mA 400 1.5A 399 398 BST 397 =1.2V OUT 396 –50 – ...
Page 5
... V (V) IN BST/OUT Startup HI SHDN LO 5V BST 1V 1.5V OUT 25°C 200µs/DIV 1Ω OUT V = 1.7V IN LTC3026 BST to OUT Headroom Voltage 2. 2.20 = 25°C A 2.18 2.16 2.14 2.12 2.10 2.08 2.06 2.04 2.02 3.5 –50 – TEMPERATURE (°C) 3026 G11 Output Load Transient Response 1.5A = 0.8V I OUT = 8Ω 2mA – 40°C 25°C 85° ...
Page 6
... ESR ceramic capacitor can be used. SHDN (Pin 6): Shutdown Input Pin, Active Low. This pin is used to put the LTC3026 into shutdown. The SHDN pin current is typically less than 10nA. The SHDN pin cannot be left floating and must be tied to a valid logic level (such as IN) if not used ...
Page 7
... W BLOCK DIAGRA SHDN SHDN REFERENCE PG 7 BOOST CONVERTER SWITCHING EN LOGIC 0.4V UVLO V OFF + – – + 0.372V OVERSHOOT DETECT LTC3026 5 BST – 1,2 + – OUT 9,10 – ADJ GND 3,11 3026 BD 3026f 7 ...
Page 8
... LTC3026 U OPERATIO The LTC3026 is a VLDO (very low dropout) linear regulator which operates from input voltages as low as 1.14V. The LDO uses an internal NMOS transistor as the pass device in a source-follower configuration. The BST pin provides the higher supply necessary for the LDO circuitry while the output current comes directly from the IN input for high efficiency regulation ...
Page 9
... PG to function correctly. Output Capacitance and Transient Response The LTC3026 is designed to be stable with a wide range of ceramic output capacitors. The ESR of the output capaci- tor affects stability, most notably with small capacitors. An output capacitor of 10µF or greater with an ESR of 0.05Ω ...
Page 10
... LTC3026 U OPERATIO individual components powered by the LTC3026 will increase the effective output capacitor value. High ESR tantalum and electrolytic capacitors may be used, but a low ESR ceramic capacitor must be in parallel at the output. There is no minimum ESR or maximum capacitor size requirements. Extra consideration must be given to the use of ceramic capacitors ...
Page 11
... OUT is less than 200µA even under heavy loads, so its power consumption can be ignored for thermal calculations. The LTC3026 has internal thermal limiting designed to protect the device during momentary overload conditions. For continuous normal conditions, the maximum junction temperature rating of 125°C must not be exceeded important to give careful consideration to all sources of thermal resistance from junction to ambient ...
Page 12
... LDO when the junction temperature exceeds approxi- mately 150°C. It will reenable the converter and LDO once the junction temperature drops back to approximately 140°C. The LTC3026 will cycle in and out of thermal shutdown without latch-up or damage until the overstress condition is removed. Long term overstress (T should be avoided as it can degrade the performance or shorten the life of the part ...
Page 13
... R1 and R2 with a short PCB trace and minimize all other stray capacitance to the ADJ pin OUT 1 IN OUT OUT GND ADJ BST SHDN 6 C BST 3026 F05 VIA CONNECTION TO GND PLANE Figure 7. Suggested Layout LTC3026 3026f 13 ...
Page 14
... LTC3026 U TYPICAL APPLICATIO 2.5V IN 10µH BST SW LTC3026 IN OUT ADJ SHDN 4.7µF GND LTC3026 WITH BOOST ENABLED FANOUT: 3-LTC3026 FOR V <1.4V IN 5-LTC3025 FOR VI >1. BIAS Using 1 Boost with Multiple Regulators 4.7µF V OUT1 1.8V, 1.5A 14k C OUT1 10µF 100k 4.02k 1µF PG PG1 2.5V Output from 3.3V Supply with External 5V Bias ...
Page 15
... DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE LTC3026 BOTTOM VIEW OF EXPOSED PAD OPTION 2.06 ± 0.102 0.889 ± 0.127 (.081 ± ...
Page 16
... Low Noise, Negative LDO LTC3025 300mA Micropower VLDO Linear Regulator LT3150 Fast Transient Response, VLDO Regulator Controller Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● (LTC3026 Boost Converter Disabled SENSE 0.04Ω 9 – BUCK IN 1 ...