Datasheet LTC3528, LTC3528B (Analog Devices) - 6
| Fabricante | Analog Devices |
| Descripción | 1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm x 2mm DFN |
| Páginas / Página | 18 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted). … |
| Formato / tamaño de archivo | PDF / 340 Kb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted). Load Step Response (Fixed. Burst Mode Waveforms
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LTC3528/LTC3528B
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted) Load Step Response (Fixed Burst Mode Waveforms V Frequency, 3.6V to 5V) OUT and IIN During Soft-Start
VOUT V 1V/DIV OUT V 20mV/DIV OUT IIN 100mV/DIV INDUCTOR 200mA/DIV LOAD CURRENT SHDN PIN CURRENT 100mA/DIV 200mA/DIV 200µs/DIV 3528 G21 VIN = 1.2V 5µs/DIV 3528 G20 VIN = 3.6V VOUT = 3.3V 20µs/DIV 3528 G22 VIN = 3.6V VOUT = 5V COUT = 10µF VOUT = 5V COUT = 22µF L = 4.7µH COUT = 10µF CFF = 33pF L = 4.7µH ILOAD = 30mA
Load Step Response (Burst Mode Load Step Response (Fixed Load Step Response (Burst Mode Operation, 3.6V to 5V, LTC3528) Frequency, 1.2V to 3.3V) Operation, 1.2V to 3.3V, LTC3528)
VOUT 100mV/DIV VOUT VOUT 100mV/DIV 100mV/DIV LOAD CURRENT LOAD LOAD 200mA/DIV CURRENT CURRENT 100mA/DIV 100mA/DIV 50µs/DIV 3528 G23 VIN = 3.6V 50µs/DIV 3528 G24 VIN = 1.2V 50µs/DIV 3528 G25 VIN = 1.2V VOUT = 5V VOUT = 3.3V VOUT = 3.3V COUT = 10µF COUT = 10µF COUT = 10µF L = 4.7µH L = 4.7µH L = 4.7µH
PIN FUNCTIONS SHDN (Pin 1):
Logic Controlled Shutdown Input. There is
VOUT (Pin 4):
Output Voltage Sense and Drain Connection an internal 4MΩ pull-down resistor on this pin. of the Internal Synchronous Rectifier. PCB trace length • SHDN = High: Normal operation from VOUT to the output filter capacitor (4.7µF minimum) • SHDN = Low: Shutdown, quiescent current < 1µA should be as short and wide as possible.
FB (Pin 2):
Feedback Input. Connect resistor divider tap
SW (Pin 5):
Switch Pin. Connect inductor between SW to this pin. The output voltage can be adjusted from 1.6V and VIN. Keep PCB trace lengths as short and wide as to 5.25V by: possible to reduce EMI. If the inductor current falls to zero, or SHDN is low, an internal anti-ringing switch is R2 V connected from SW to VIN to minimize EMI. OUT = 1.20V • 1+ R1
PGND (Pin 6):
Power Ground. Provide a short direct PCB
PGOOD (Pin 3):
Power Good Comparator Output. This path between PGND and the (–) side of the input and open-drain output is low when V output capacitors. FB < 10% from its regu- lation voltage. 3528fd 6 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 Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted) Load Step Response (Fixed Burst Mode Waveforms V Frequency, 3.6V to 5V) OUT and IIN During Soft-Start
VOUT V 1V/DIV OUT V 20mV/DIV OUT IIN 100mV/DIV INDUCTOR 200mA/DIV LOAD CURRENT SHDN PIN CURRENT 100mA/DIV 200mA/DIV 200µs/DIV 3528 G21 VIN = 1.2V 5µs/DIV 3528 G20 VIN = 3.6V VOUT = 3.3V 20µs/DIV 3528 G22 VIN = 3.6V VOUT = 5V COUT = 10µF VOUT = 5V COUT = 22µF L = 4.7µH COUT = 10µF CFF = 33pF L = 4.7µH ILOAD = 30mA
Load Step Response (Burst Mode Load Step Response (Fixed Load Step Response (Burst Mode Operation, 3.6V to 5V, LTC3528) Frequency, 1.2V to 3.3V) Operation, 1.2V to 3.3V, LTC3528)
VOUT 100mV/DIV VOUT VOUT 100mV/DIV 100mV/DIV LOAD CURRENT LOAD LOAD 200mA/DIV CURRENT CURRENT 100mA/DIV 100mA/DIV 50µs/DIV 3528 G23 VIN = 3.6V 50µs/DIV 3528 G24 VIN = 1.2V 50µs/DIV 3528 G25 VIN = 1.2V VOUT = 5V VOUT = 3.3V VOUT = 3.3V COUT = 10µF COUT = 10µF COUT = 10µF L = 4.7µH L = 4.7µH L = 4.7µH
PIN FUNCTIONS SHDN (Pin 1):
Logic Controlled Shutdown Input. There is
VOUT (Pin 4):
Output Voltage Sense and Drain Connection an internal 4MΩ pull-down resistor on this pin. of the Internal Synchronous Rectifier. PCB trace length • SHDN = High: Normal operation from VOUT to the output filter capacitor (4.7µF minimum) • SHDN = Low: Shutdown, quiescent current < 1µA should be as short and wide as possible.
FB (Pin 2):
Feedback Input. Connect resistor divider tap
SW (Pin 5):
Switch Pin. Connect inductor between SW to this pin. The output voltage can be adjusted from 1.6V and VIN. Keep PCB trace lengths as short and wide as to 5.25V by: possible to reduce EMI. If the inductor current falls to zero, or SHDN is low, an internal anti-ringing switch is R2 V connected from SW to VIN to minimize EMI. OUT = 1.20V • 1+ R1
PGND (Pin 6):
Power Ground. Provide a short direct PCB
PGOOD (Pin 3):
Power Good Comparator Output. This path between PGND and the (–) side of the input and open-drain output is low when V output capacitors. FB < 10% from its regu- lation voltage. 3528fd 6 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 Related Parts