Analog Devices Inc. LT8636x/LT8637x Synch Step-Down Regulators

Analog Devices Inc. LT8636x/LT8637x Synch Step-Down Regulators feature Silent Switcher® architecture designed to minimize electromagnetic interference (EMI) emissions. This allows the step-down regulators to deliver high efficiency at high switching frequencies. Output voltage on step-down regulators are lower than their input voltage. The Step-Down Regulators also feature peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies. LT8636 also has an ultralow 2.5µA quiescent current. The LT8637has external compensation to enable current sharing and fast transient response at high switching frequencies. A CLKOUT pin enables synchronizing other regulators tothe LT8636/LT8637.

Features

Silent Switcher® Architecture
- Ultralow EMI emissions
- Optional spread spectrum modulation
High efficiency at high frequency
- Up to 96% efficiency at 1MHz, 12V_IN to 5V_OUT
- Up to 95% efficiency at 2MHz, 12V_IN to 5V_OUT
3.4V to 42V wide input voltage range
5A maximum continuous, 7A peak output
30ns fast minimum switch on-time

Ultralow quiescent current Burst Mode® operation
- 2.5µA IQ regulating 12V_IN to 3.3V_OUT (LT8636)
- Output ripple < 10mV_P-P
- _{External compensation of fast transient response and current sharing (LT8637)}
100mV at 1A low dropout under all conditions
Forced continuous mode
200kHz to 3MHz adjustable and synchronizable
Output soft-start and tracking
Small 20-lead 4mm × 3mm LQFN package
AEC-Q100 qualification in progress