L6732 Adjustable step-down controller with synchronous rectification

The controller is an integrated circuit realized in BCD5 (BiCMOS-DMOS, version 5) fabrication that provides complete control logic and protection for high performance step-down DC-DC and niPoL converters.

It is designed to drive N-channel MOSFETs in a synchronous rectified buck topology. The output voltage of the converter can be precisely regulated down to 600 mV with a maximum tolerance of ±0.8 % and it is also possible to use an external reference from 0 V to 2.5 V.

The input voltage can range from 1.8 V to 14 V, while the supply voltage can range from 4.5 V to 14 V. High peak current gate drivers provide for fast switching to the external power section, and the output current can be in excess of 20 A. The PWM duty cycle can range from 0 % to 100 % with a minimum on-time (TON, MIN) lower than 100 ns making possible conversions with very low duty cycle at high switching frequency. The device provides voltage-mode control that includes a selectable frequency oscillator (250 kHz or 500 kHz).

The error amplifier features a 10 MHz gain-bandwidth-product and 5 V/µs slew-rate that permits to realize high converter bandwidth for fast transient response. The device monitors the current by using the RDS(on) of both the high-side and low-side MOSFET(s), eliminating the need for a current sensing resistor and guaranteeing an effective over-current-protection in all the application conditions. When necessary, two different current limit protections can be externally set through two external resistors.

During the soft-start phase a constant current protection is provided while after the soft-start the device enters in hiccup mode in case of over-current. During the soft-start, the sink mode capability is disabled in order to allow a proper start-up also in pre-biased output voltage conditions. After the soft-start the device can sink current. Other features are power good, master/slave synchronization (with 180° phase shift), over-voltage-protection, feed-back disconnection and thermal shutdown. The HTSSOP16 package allows the realization of really compact DC/DC converters

技术特性

Input voltage range from 1.8V to 14V
Supply voltage range from 4.5V to 14V
Adjustable output voltage down to 0.6V with ±0.8% accuracy over line voltage and temperature (0˚C~125˚C)
Fixed frequency voltage mode control
TON lower than 100ns
0% to 100% duty cycle
External input voltage reference
Soft-start and inhibit
High current embedded drivers
Predictive anti-cross conduction control
Programmable high-side and low-side RDS(on) sense over-current-protection
Selectable switching frequency 250KHz/500KHz
Pre-bias start up capability
Power good output
Master/slave synchronization with 180˚ phase shift
Over voltage protection
Thermal shut-down
Package: HTSSOP16

功能框图

L6732 订购信息

订购型号	产品状态	美金价格	数量	封装	包装形式	温度范围	材料声明
L6732TR	Active		1000	HTSSOP16	Tape And Reel
L6732	Active		1000	HTSSOP16	Tube

DATASHEET

描述	版本	大小
L6732 : DS4562: Adjustable step-down controller with synchronous rectification	6	890KB

BOARDS AND TOOLS

型号	描述
STEVAL-ISA026V1	Step-down DC-DC converter evaluation board with 3.3 Vout / 20 A and switching frequency of 250 kHz, based on the L6732