快速浏览 - MAX730A, MAX738A, MAX744A 5V、降压型、电流模式PWM DC-DC转换器

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The MAX730A/MAX738A/MAX744A are 5V-output CMOS, step-down switching regulators. The MAX738A/MAX744A accept inputs from 6V to 16V and deliver 750mA. The MAX744A guarantees 500mA load capability for inputs above 6V and has tighter oscillator frequency limits for low-noise (radio) applications. The MAX730A accepts inputs between 5.2V and 11V and delivers 450mA for inputs above 6V. Typical efficiencies are 85% to 96%. Quiescent supply current is 1.7mA and only 6µA in shutdown.

Pulse-width modulation (PWM) current-mode control provides precise output regulation and excellent transient responses. Output voltage accuracy is guaranteed to be ±5% over line, load, and temperature variations. Fixed-frequency switching allows easy filtering of output ripple and noise, as well as the use of small external components. These regulators require only a single inductor value to work in most applications, so no inductor design is necessary.

The MAX730A/MAX738A/MAX744A also feature cycle-by-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection.

关键特性

应用/使用

750mA Load Currents (MAX738A/MAX744A)
High-Frequency, Current-Mode PWM
159kHz to 212.5kHz Guaranteed Oscillator Frequency Limits (MAX744A)
85% to 96% Efficiencies
1.7mA Quiescent Current
6µA Shutdown Supply Current
Single Preselected Inductor Value, No Component Design Required
Overcurrent, Soft-Start, and Undervoltage Lockout Protection
Cycle-by-Cycle Current Limiting
8-Pin DIP/SO Packages (MAX730A)

	蜂窝电话
	计算机外设
	分布式供电系统
	个人通信装置
	便携式仪表

Key Specifications: Step-Down Switching Regulators
Part Number	V_IN (min) (V)	V_IN (max) (V)	Min. V_OUT (V)	Max. V_OUT (V)	Preset V_OUT (V)	I_OUT (A)	I_OUT (A)	Output Adj. Method	Operating Current, I_CC (max) (mA)	Number of DC-DC Outputs	Operating Freq. (kHz)	Package	Smallest Available Package (max w/pins) (mm²)	Price^**
MAX730A	5.2	11	5	5	5.0	0.45	0.45	Preset Resistor	3	1	210	CDIP(N)/8 PDIP(N)/8 SOIC(N)/8	31	$2.15 @ 1k
MAX738A	6	16				0.75	0.75				190	CDIP(N)/8 PDIP(N)/8 SOIC(W)/16	82	$2.60 @ 1k
MAX744A	6	16				0.75	0.75				212.5	CDIP(N)/8 PDIP(N)/8 SOIC(W)/16	82	$2.90 @ 1k
See All Step-Down Switching Regulators (252)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.