LM5122 3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability

Description

The LM5122 is a multi-phase capable synchronous boost controller intended for high-efficiency synchronous boost regulator applications. The control method is based upon peak-current-mode control. Current-mode control provides inherent line feed forward, cycle-by-cycle current limiting, and ease of loop compensation.

The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved by two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode-emulation mode also enables discontinuous-mode operation for improved efficiency at light load conditions.

An internal charge pump allows 100% duty cycle for high-side synchronous switch (bypass operation). A 180° phase shifted clock output enables easy multi-phase interleaved configuration. Additional features include thermal shutdown, frequency synchronization, hiccup-mode current limit, and adjustable line undervoltage lockout.

Features

Maximum Input Voltage: 65 V
Minimum Input Voltage: 3 V (4.5 V for Start-Up)
Output Voltage up to 100 V
Bypass (V_OUT = V_IN) Operation
1.2-V Reference with ±1% Accuracy
Free-Run and Synchronizable Switching to 1 MHz
Peak-Current-Mode Control
Robust 3-A Integrated Gate Drivers
Adaptive Dead-Time Control
Optional Diode-Emulation Mode
Programmable Cycle-by-Cycle Current Limit
Hiccup-Mode Overload Protection
Programmable Line UVLO
Programmable Soft Start
Thermal Shutdown Protection
Low Shutdown Quiescent Current: 9 µA
Programmable Slope Compensation
Programmable Skip-Cycle Mode Reduces Standby Power
Allows External VCC Supply
Inductor DCR Current Sensing Capability
Multi-phase Capability
Thermally Enhanced 20 or 24-Pin HTSSOP
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Parametrics

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Part number	Order	Vin (Min) (V)	Vin (Max) (V)	Vout (Min) (V)	Vout (Max) (V)	Regulated outputs (#)	Switching frequency (Min) (kHz)	Switching frequency (Max) (kHz)	Iq (Typ) (mA)	Features	Duty cycle (Max) (%)	Operating temperature range (C)	Rating	Type	Package Group
LM5122	Order now	3	65	3	100	1	50	1000	4	Enable Frequency Synchronization Phase Interleaving Synchronous Rectification UVLO Adjustable	100	-40 to 125	Catalog	Controller	HTSSOP \| 20 HTSSOP \| 24
LM25122-Q1	Order now	3	42	3	50	1	50	600	4	Enable Frequency Synchronization Phase Interleaving Synchronous Rectification	100	-40 to 125	Automotive	Controller	HTSSOP \| 20
LM3481	Order now	2.97	48	1.275	500	1	100	1000	3.7	Adjustable Current Limit Enable Frequency Synchronization Light Load Efficiency Pre-Bias Start-Up UVLO Adjustable	85	-40 to 125	Catalog	Controller	VSSOP \| 10
LM5020	Order now	13	100	1.25	300	1	175	1000	2	Enable Frequency Synchronization Pre-Bias Start-Up	80	-40 to 125	Catalog	Controller	VSSOP \| 10 WSON \| 10
LM5022	Order now	6	60	1.25	300	1	170	2200	3.5	Enable Frequency Synchronization UVLO Adjustable	90	-40 to 125	Catalog	Controller	VSSOP \| 10
LM5121	Order now	3	65

	Min		Max	Range
Vin		–	V	4.5 to 65.0V
Vout			V	4.5 to 100V
Iout			A	≤ 35A
Ambient Temp			°C	-40 to 125°C

LM5122 ACTIVE This product has been released to the market and is available for purchase. For some products, newer alternatives may be available. 3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability

Description

Features

WEBENCH® Designer LM5122

Parametrics

LM5122
ACTIVE

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

3-65V Wide Vin, Current Mode Synchronous Boost Controller with Multiphase Capability

WEBENCH^® Designer LM5122