Datasheet LTC3026 (Analog Devices)

LTC3026 1.5A Low Input Voltage VLDO Linear Regulator
FeaTures DescripTion
n
Input Voltage Range:
The LTC®3026 is a very low dropout (VLDO™) linear regula-
1.14V to 3.5V (with Boost Enabled)
tor that can operate at input voltages down to 1.14V. The
1.14V to 5.5V (with External 5V Boost)
device is capable of supplying 1.5A of output current with n
Low Dropout Voltage: 100mV at IOUT = 1.5A
a typical dropout voltage of only 100mV. To allow opera- n
Adjustable Output Range: 0.4V to 2.6V
tion at low input voltages the LTC3026 includes a boost n
Output Current: Up to 1.5A
converter that provides the necessary headroom for the n
Excellent Supply Rejection Even Near Dropout
internal LDO circuitry. n Shutdown Disconnects Load from VIN and VBST Output current comes directly from the input supply to n Low Operating Current: IIN = 950µA at VIN = 1.5V maximize efficiency. The boost converter requires only a n Low Shutdown Current: small chip inductor and ceramic capacitor for operation. IIN < 1µA (Typ), IBST = 0.1µA (Typ) Additionally, the boosted output voltage of one LTC3026 n Stable with 10µF or Greater Ceramic Capacitors can supply the boost voltage for other LTC3026s, thus n Short-Circuit, Reverse Current Protected requiring a single inductor for multiple LDOs. A user sup- n Overtemperature Protected plied boost voltage can be used eliminating the need for n Available in 10-Lead MSOP and 10-Lead an inductor altogether. (3mm × 3mm) DFN Packages The LTC3026 regulator is stable with 10µF or greater
applicaTions
ceramic output capacitors. The device has a low 0.4V reference voltage which is used to program the output n High Efficiency Linear Regulator voltage via two external resistors. The device also has n Post Regulator for Switching Supplies internal current limit, overtemperature shutdown, and n Microprocessor Supply reverse output current protection. The LTC3026 is avail- L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks able in a small 10-lead MSOP or low profile (0.75mm) and ThinSOT, VLDO are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 10-lead 3mm × 3mm DFN package.
Typical applicaTion 1.2V Output Voltage from 1.5V Input Supply Dropout Voltage vs Output Current
150 L1 SW 10µH BST 5V BOOST CONVERTER 4.7µF 100 IN VIN = 1.5V 1.2V 1.5V 4.7µF 0.4V + 2.0V 2.6V – OUT VOUT = 1.2V, DROPOUT (mV) 50 1.5A 8.06k ADJ COUT OFF ON SHDN 10µF LTC3026 100k 4.02k 0 0 0.5 1.0 1.5 GND PG IOUT (A) 3026 TA01a 3026 TA01b L1: MURATA LQH2MCN100K02 3026ff 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts