MAX1637 소형, 저전압, 정밀 스텝 다운 컨트롤러

제품 설명

The MAX1637 synchronous, buck, switch-mode power-supply controller generates the CPU supply voltage in battery-powered systems. The MAX1637 is a stripped-down version of the MAX1636 in a smaller 16-pin QSOP package. The MAX1637 is intended to be powered separately from the battery by an external bias supply (typically the +5V system supply) in applications where the battery exceeds 5.5V. The MAX1637 achieves excellent DC and AC output voltage accuracy. This device can operate from a low input voltage (3.15V) and delivers the excellent load-transient response needed by upcoming generations of dynamic-clock CPUs.

Using synchronous rectification, the MAX1637 achieves up to 95% efficiency. Efficiency is greater than 80% over a 1000:1 load-current range, which extends battery life in system-suspend or standby mode. Excellent dynamic response corrects output load transients caused by the latest dynamic-clock CPUs within five 300kHz clock cycles. Powerful 1A on-board gate drivers ensure fast external N-channel MOSFET switching.

The MAX1637 features a logic-controlled and synchronizable, fixed-frequency, pulse-width-modulation (PWM) operating mode. This reduces noise and RF interference in sensitive mobile-communications and pen-entry applications. Asserting the SKIP-bar pin enables fixed-frequency mode, for lowest noise under all load conditions. For a stand-alone device that includes a +5V VL linear regulator and low-dropout capabilities, refer to the MAX1636 data sheet.

주요기능

애플리케이션/용도

±2% DC Accuracy
0.1% (typ) DC Load Regulation
Adjustable Switching Frequency to 350kHz
Idle Mode™ Pulse-Skipping Operation
1.10V to 5.5V Adjustable Output Voltage
3.15V Minimum IC Supply Voltage (at V_CC pin)
Internal Digital Soft-Start
1.1V ±2% Reference Output
1µA Total Shutdown Current
Output Overvoltage Crowbar Protection
Output Undervoltage Shutdown (foldback)
Tiny 16-Pin QSOP Package

	핸디 터미널, PDA
	노트북 컴퓨터
	서브노트북 컴퓨터

Key Specifications: Step-Down Switching Regulators

Part Number

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

I_OUT (A)

Output Adj. Method

Operating Current, I_CC (max) (mA)

Number of DC-DC Outputs

Operating Freq. (kHz)

Features

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX1637

3.15

5.5

1.1

5.5

Resistor

0.5

350

•	Adjustable Frequency

•	Current Limit

•	External Synchronization

•	Fixed Frequency/ PWM Operation

•	Output Overvoltage Protection

•	Output Undervoltage Protection

•

Shutdown

•	Soft Start

•	Synchronous Rectifier

Yes

QSOP/16

Yes

-40 to +85

$3.70 @ 1k

See All Step-Down Switching Regulators (223)

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Operating Freq. (kHz)

Internal Power Switch(es)

Package

Price^**

MAX1637

Step-Down

3.15

5.5

1.1

5.5

0.5

350

QSOP/16

$3.70 @ 1k

See All Switch-Mode DC-DC Power Supplies (429)

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.

주문 정보

참고:

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부품번호 suffix: T 또는 T&R = 테잎 앤 릴, + = RoHS/lead-free, # = RoHS/lead 예외.추가 정보:전체 데이터 시트또는 부품번호 규칙
* 일부 패키지는 크기 편차(variation)를 가지며 이 값은 도면 상에 제시되어 있습니다. “패키지 코드/편차”는 해당 제품이 사용하고 있는 편차를 보여줍니다. 부품번호 suffix에 "+", "#", "-"는 RoHS 준수 상태를 나타냅니다. 패키지 도면에 suffix 문자는 다를 수 있습니다.

소자: 1-4 / 4

MAX1637

무료 샘플

구매

패키지:	타입 핀 풋프린트
	도면 코드/편차 *

온도

RoHS/Lead-Free?
재료 분석

MAX1637EEE

QSOP,13 핀,
도면: 21-0055H (PDF)
패키지 코드/편차 이용: E16-1*

-40°C ~ +85°C

데이터 시트 보기

MAX1637EEE-T

QSOP,13 핀,
도면: 21-0055H (PDF)
패키지 코드/편차 이용: E16-1*

-40°C ~ +85°C

데이터 시트 보기

MAX1637EEE+

QSOP,16 핀,
도면: 21-0055H (PDF)
패키지 코드/편차 이용: E16+1*

-40°C ~ +85°C

RoHS/Lead-Free: Lead-Free
재료 분석

MAX1637EEE+T

QSOP,16 핀,
도면: 21-0055H (PDF)
패키지 코드/편차 이용: E16+1*

-40°C ~ +85°C

RoHS/Lead-Free: Lead-Free
재료 분석

관련된 제품군

MAX1636 휴대용 CPU 전원용 저전압, 정밀 스텝 다운 컨트롤러