Datasheet LT8650S (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current |
| Pages / Page | 32 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. Transient Response Internal. … |
| Revision | B |
| File Format / Size | PDF / 3.3 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Transient Response Internal. Transient Response External. Compensation
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Text Version of Document
LT8650S
TYPICAL PERFORMANCE CHARACTERISTICS Transient Response Internal Transient Response Internal Transient Response External Compensation Compensation Compensation
ILOAD ILOAD 2A/DIV I 2A/DIV LOAD 2A/DIV VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV 20µs/DIV 8650S G32 20µs/DIV 8650S G33 20µs/DIV 8650S G34 2A TO 4A TRANSIENT 40mA TO 2A TRANSIENT 2A TO 4A TRANSIENT 3.3VOUT 3.3VOUT 3.3VOUT COUT = 47µF ×2 COUT = 47µF ×2 COUT = 47µF ×2 FCM, fSW = 2MHz FCM, fSW = 2MHz FCM, fSW = 2MHz CC = 220pF, RC = 14kΩ
Transient Response External Compensation Forced Continuous Mode (FCM) Burst Mode Operation
ILOAD 2A/DIV SW SW 5V/DIV 5V/DIV VOUT 100mV/DIV IL IL 1A/DIV 1A/DIV 20µs/DIV 8650S G35 2µs/DIV 8650S G36 2µs/DIV 8650S G37 40mA TO 2A TRANSIENT 12VIN TO 5VOUT AT 100mA 12VIN TO 5VOUT AT 100mA 3.3VOUT SYNC = FLOAT SYNC = 0V COUT = 47µF ×2 FCM, fSW = 2MHz CC = 220pF, RC = 14kΩ
CH1, CH2, and CLKOUT Switch Rising Edge Start-Up Dropout Performance
FCM SW1 (SYNC FLOAT) 10V/DIV VIN 2V/DIV SW2 10V/DIV VSW 2V/DIV VOUT CLKOUT 2V/DIV 2V/DIV 500ns/DIV 8650S G38 1ns/DIV 8650S G40 100ms/DIV 8650S G40 VIN = 12V 5Ω LOAD CH1 = 5VOUT (1A IN REGULATION) CH2 = 3.3VOUT SYNC = FLOAT Rev. B 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Transient Response Internal Transient Response Internal Transient Response External Compensation Compensation Compensation
ILOAD ILOAD 2A/DIV I 2A/DIV LOAD 2A/DIV VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV 20µs/DIV 8650S G32 20µs/DIV 8650S G33 20µs/DIV 8650S G34 2A TO 4A TRANSIENT 40mA TO 2A TRANSIENT 2A TO 4A TRANSIENT 3.3VOUT 3.3VOUT 3.3VOUT COUT = 47µF ×2 COUT = 47µF ×2 COUT = 47µF ×2 FCM, fSW = 2MHz FCM, fSW = 2MHz FCM, fSW = 2MHz CC = 220pF, RC = 14kΩ
Transient Response External Compensation Forced Continuous Mode (FCM) Burst Mode Operation
ILOAD 2A/DIV SW SW 5V/DIV 5V/DIV VOUT 100mV/DIV IL IL 1A/DIV 1A/DIV 20µs/DIV 8650S G35 2µs/DIV 8650S G36 2µs/DIV 8650S G37 40mA TO 2A TRANSIENT 12VIN TO 5VOUT AT 100mA 12VIN TO 5VOUT AT 100mA 3.3VOUT SYNC = FLOAT SYNC = 0V COUT = 47µF ×2 FCM, fSW = 2MHz CC = 220pF, RC = 14kΩ
CH1, CH2, and CLKOUT Switch Rising Edge Start-Up Dropout Performance
FCM SW1 (SYNC FLOAT) 10V/DIV VIN 2V/DIV SW2 10V/DIV VSW 2V/DIV VOUT CLKOUT 2V/DIV 2V/DIV 500ns/DIV 8650S G38 1ns/DIV 8650S G40 100ms/DIV 8650S G40 VIN = 12V 5Ω LOAD CH1 = 5VOUT (1A IN REGULATION) CH2 = 3.3VOUT SYNC = FLOAT Rev. B 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
