Datasheet LTC3526L, LTC3526LB (Analog Devices) - 7

LTC3526L/LTC3526LB block DiAgrAM L1 V 4.7µH IN 0.8V TO 5V CIN 3 1 2.2µF VIN SW VOUT VSEL WELL V SWITCH BEST VB V V OUT OUT 6 1.5V ANTI-RING TO 5.25V GATE DRIVERS AND R2 ANTI-CROSS SHDN FB C 4 SHUTDOWN SHUTDOWN CONDUCTION – + 5 OUT I 4.7µF ZERO 4M COMP R1 I SLOPE PK V COMP REF VREF – COMP IPK UVLO + ERROR AMP IZERO SLEEP COMP START-UP + VREF LOGIC MODE – 1MHz CLK CONTROL OSC CLAMP THERMAL TSD WAKE SHUTDOWN CSS EXPOSED PAD GND 7 2 3526l BD operAtion
(Refer to Block Diagram)
The LTC3526L/LTC3526LB are 1MHz synchronous boost range of load currents. Burst Mode operation maintains converters housed in a 6-lead 2mm × 2mm DFN package. high efficiency at very light loads, reducing the quiescent With a guaranteed ability to start up and operate from inputs current to just 9µA. Operation can be best understood by less than 0.8V, this device features fixed frequency, current referring to the Block Diagram. mode PWM control for exceptional line and load regula- tion. The current mode architecture with adaptive slope
LOW VOLTAGE START-UP
compensation provides excellent transient load response, requiring minimal output filtering. Internal soft-start and The LTC3526L/LTC3526LB include an independent start- internal loop compensation simplifies the design process up oscillator designed to start up at an input voltage of while minimizing the number of external components. 0.68V (typical). Soft-start and inrush current limiting are provided during start-up, as well as normal mode. With its low RDS(ON) and low gate charge internal N-chan- nel MOSFET switch and P-channel MOSFET synchronous When either VIN or VOUT exceeds 1.3V typical, the IC rectifier, the LTC3526L achieves high efficiency over a wide enters normal operating mode. When the output voltage 3526lfc Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts