Datasheet LTC3526L, LTC3526LB (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | 550mA 1MHz Synchronous Step-Up DC/DC Converters in 2mm × 2mm DFN |
| Seiten / Seite | 16 / 6 — Load Step Response. Load Step Response (from Burst. (Fixed Frequency). … |
| Dateiformat / Größe | PDF / 352 Kb |
| Dokumentensprache | Englisch |
Load Step Response. Load Step Response (from Burst. (Fixed Frequency). Mode Operation) (LTC3526L). SW (Pin 1):. SHDN (Pin 4):
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LTC3526L/LTC3526LB typicAl perForMAnce chArActeristics
Load Step Response Load Step Response (from Burst (Fixed Frequency) Mode Operation) (LTC3526L)
VOUT V 100mV/DIV OUT 100mV/DIV AC-COUPLED AC-COUPLED LOAD CURRENT LOAD 50mA/DIV CURRENT 50mA/DIV V 3526l G21 3526l G22 IN = 1.2V 100µs/DIV VIN = 1.2V 50µs/DIV VOUT = 3.3V VOUT = 3.3V 50mA TO 100mA STEP 5mA TO 100mA STEP COUT = 10µF COUT = 10µF pin Functions
SW (Pin 1):
Switch Pin. Connect inductor between SW and
SHDN (Pin 4):
Logic Controlled Shutdown Input. There VIN. Keep PCB trace lengths as short and wide as possible is an internal 4MΩ pull-down on this pin. to reduce EMI. If the inductor current falls to zero or SHDN • SHDN = High: Normal operation is low, an internal anti-ringing switch is connected from SW to V • SHDN = Low: Shutdown, quiescent current < 1µA IN to minimize EMI.
GND (Pin 2, Exposed Pad Pin 7):
Signal and Power Ground.
FB (Pin 5):
Feedback Input to the gm Error Amplifier. Con- Provide a short direct PCB path between GND and the nect resistor divider tap to this pin. The top of the divider (–) side of the input and output capacitors. The Exposed connects to the output capacitor, the bottom of the divider Pad must be soldered to the PCB ground plane. It serves connects to GND. Referring to the Block Diagram, the output as an additional ground connection and as a means of voltage can be adjusted from 1.5V to 5.25V by: conducting heat away from the package. R2 V 1 195 . V • 1
V
OUT = +
IN (Pin 3):
Input Supply Pin. Connect a minimum of 1µF R1 ceramic decoupling capacitor from this pin to ground using short direct PCB traces.
VOUT (Pin 6):
Output voltage sense and drain of the internal synchronous rectifier. PCB trace from VOUT to the output filter capacitor (4.7µF minimum) should be as short and 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
Load Step Response Load Step Response (from Burst (Fixed Frequency) Mode Operation) (LTC3526L)
VOUT V 100mV/DIV OUT 100mV/DIV AC-COUPLED AC-COUPLED LOAD CURRENT LOAD 50mA/DIV CURRENT 50mA/DIV V 3526l G21 3526l G22 IN = 1.2V 100µs/DIV VIN = 1.2V 50µs/DIV VOUT = 3.3V VOUT = 3.3V 50mA TO 100mA STEP 5mA TO 100mA STEP COUT = 10µF COUT = 10µF pin Functions
SW (Pin 1):
Switch Pin. Connect inductor between SW and
SHDN (Pin 4):
Logic Controlled Shutdown Input. There VIN. Keep PCB trace lengths as short and wide as possible is an internal 4MΩ pull-down on this pin. to reduce EMI. If the inductor current falls to zero or SHDN • SHDN = High: Normal operation is low, an internal anti-ringing switch is connected from SW to V • SHDN = Low: Shutdown, quiescent current < 1µA IN to minimize EMI.
GND (Pin 2, Exposed Pad Pin 7):
Signal and Power Ground.
FB (Pin 5):
Feedback Input to the gm Error Amplifier. Con- Provide a short direct PCB path between GND and the nect resistor divider tap to this pin. The top of the divider (–) side of the input and output capacitors. The Exposed connects to the output capacitor, the bottom of the divider Pad must be soldered to the PCB ground plane. It serves connects to GND. Referring to the Block Diagram, the output as an additional ground connection and as a means of voltage can be adjusted from 1.5V to 5.25V by: conducting heat away from the package. R2 V 1 195 . V • 1
V
OUT = +
IN (Pin 3):
Input Supply Pin. Connect a minimum of 1µF R1 ceramic decoupling capacitor from this pin to ground using short direct PCB traces.
VOUT (Pin 6):
Output voltage sense and drain of the internal synchronous rectifier. PCB trace from VOUT to the output filter capacitor (4.7µF minimum) should be as short and 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