Datasheet LTC3606B (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 800mA Synchronous Step-Down DC/DC with Average Input Current Limit |
| Pages / Page | 20 / 1 — FEATURES. DESCRIPTION. Programmable Average Input Current Limit:. ±5% … |
| File Format / Size | PDF / 354 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Programmable Average Input Current Limit:. ±5% Accuracy. Step-Down Output: Up to 96% Effi ciency
Model Line for this Datasheet
Text Version of Document
LTC3606B 800mA Synchronous Step-Down DC/DC with Average Input Current Limit
FEATURES DESCRIPTION
n
Programmable Average Input Current Limit:
The LTC®3606B is an 800mA monolithic synchronous
±5% Accuracy
buck regulator using a constant frequency current mode n
Step-Down Output: Up to 96% Effi ciency
architecture. n
Low Noise Pulse-Skipping Operation at Light Loads
The input supply voltage range is 2.5V to 5.5V, making it n
Input Voltage Range: 2.5V to 5.5V
ideal for Li-Ion and USB powered applications. 100% duty n
Output Voltage Range: 0.6V to 5V
cycle capability provides low dropout operation, extending n
2.25MHz Constant-Frequency Operation
the run time in battery-operated systems. Low output n
Power Good Output Voltage Monitor
voltages are supported with the 0.6V feedback reference n
Low Dropout Operation: 100% Duty Cycle
voltage. The LTC3606B can supply 800mA output current. n
Internal Soft-Start
n Current Mode Operation for Excellent Line and Load The LTC3606B’s programmable average input current limit Transient Response is ideal for USB applications and for point-of-load power n ±2% Output Voltage Accuracy supplies because the LTC3606B’s limited input current n Short-Circuit Protected will still allow its output to deliver high peak load cur- n Shutdown Current ≤ 1μA rents without collapsing the input supply. The operating n Available in Small Thermally Enhanced 8-Lead frequency is internally set at 2.25MHz allowing the use of 3mm × 3mm DFN Package small surface mount inductors. Internal soft-start reduces in-rush current during start-up. The LTC3606B is available
APPLICATIONS
in an 8-Lead 3mm × 3mm DFN package. n High Peak Load Current Applications L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the n USB Powered Devices property of their respective owners. Protected by U.S.Patents, including 5481178, 6127815, n 6304066, 6498466, 6580258, 6611131. Supercapacitor Charging n Radio Transmitters and Other Handheld Devices
TYPICAL APPLICATION Monolithic Buck Regulator with Input Current Limit GSM Pulse Load
1.5μH V VOUT IN 3.4V V V SW OUT TO 5.5V IN 3.4V AT 200mV/DIV LTC3606B 800mA 499k CIN RUN VIN 10μF + 2.2mF AC-COUPLED PGOOD s2 1210k 1V/DIV V SuperCap RLIM FB PGOOD I GND OUT 255k 500mA/DIV 116k 1000pF 3606B TA01 IIN 500mA/DIV ILIM = 475mA 1ms/DIV 3606B TA01b VIN = 5V, 500mA COMPLIANT ILOAD = 0A to 2.2A 3606bfb 1
FEATURES DESCRIPTION
n
Programmable Average Input Current Limit:
The LTC®3606B is an 800mA monolithic synchronous
±5% Accuracy
buck regulator using a constant frequency current mode n
Step-Down Output: Up to 96% Effi ciency
architecture. n
Low Noise Pulse-Skipping Operation at Light Loads
The input supply voltage range is 2.5V to 5.5V, making it n
Input Voltage Range: 2.5V to 5.5V
ideal for Li-Ion and USB powered applications. 100% duty n
Output Voltage Range: 0.6V to 5V
cycle capability provides low dropout operation, extending n
2.25MHz Constant-Frequency Operation
the run time in battery-operated systems. Low output n
Power Good Output Voltage Monitor
voltages are supported with the 0.6V feedback reference n
Low Dropout Operation: 100% Duty Cycle
voltage. The LTC3606B can supply 800mA output current. n
Internal Soft-Start
n Current Mode Operation for Excellent Line and Load The LTC3606B’s programmable average input current limit Transient Response is ideal for USB applications and for point-of-load power n ±2% Output Voltage Accuracy supplies because the LTC3606B’s limited input current n Short-Circuit Protected will still allow its output to deliver high peak load cur- n Shutdown Current ≤ 1μA rents without collapsing the input supply. The operating n Available in Small Thermally Enhanced 8-Lead frequency is internally set at 2.25MHz allowing the use of 3mm × 3mm DFN Package small surface mount inductors. Internal soft-start reduces in-rush current during start-up. The LTC3606B is available
APPLICATIONS
in an 8-Lead 3mm × 3mm DFN package. n High Peak Load Current Applications L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the n USB Powered Devices property of their respective owners. Protected by U.S.Patents, including 5481178, 6127815, n 6304066, 6498466, 6580258, 6611131. Supercapacitor Charging n Radio Transmitters and Other Handheld Devices
TYPICAL APPLICATION Monolithic Buck Regulator with Input Current Limit GSM Pulse Load
1.5μH V VOUT IN 3.4V V V SW OUT TO 5.5V IN 3.4V AT 200mV/DIV LTC3606B 800mA 499k CIN RUN VIN 10μF + 2.2mF AC-COUPLED PGOOD s2 1210k 1V/DIV V SuperCap RLIM FB PGOOD I GND OUT 255k 500mA/DIV 116k 1000pF 3606B TA01 IIN 500mA/DIV ILIM = 475mA 1ms/DIV 3606B TA01b VIN = 5V, 500mA COMPLIANT ILOAD = 0A to 2.2A 3606bfb 1
