Datasheet > 电源电路 > 开关式稳压器或控制器> ADP1621ARMZ

ADP1621ARMZ

更新时间： 2024-11-23 04:31:39

品牌	Logo	应用领域
亚德诺 - ADI		稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数	文件大小	规格书
32页	777K
描述
Constant-Frequency, Current-Mode Step-Up DC/DC Controller

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数据手册
替代型号

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ADP1621ARMZ 数据手册

Constant-Frequency, Current-Mode

Step-Up DC/DC Controller

ADP1621

FEATURES

92% efficiency (no sense resistor required)

TYPICAL APPLICATION CIRCUIT

_IN= 3.3V

1.0% initial accuracy

4.7µH

IC supply voltage range: 2.9 V to 5.5 V

Power-input voltage as low as 1.0 V

Capable of high supply input voltage (>5.5 V)

with an external NPN or a resistor

_OUT= 5V

1µF

10V

0.1µF

10V

R_S

80Ω

35.7kΩ

C_OUT1C_OUT2C_OUT3

1µF

10V

10µF

150µF

6.3V

×2

10V

V_INUVLO and 35 mA shunt regulator

ADP1621

11.5kΩ

External slope compensation with 1 resistor

Programmable operating frequency

(100 kHz to 1.5 MHz) with 1 resistor

Lossless current sensing for switch-node voltage <30 V

Resistor current sensing for switch-node voltage >30 V

Synchronizable to external clock

SDSN

COMP

FREQ

GATE

PGND

R_COMP

9.09kΩ

120pF

GND

C_COMP

1.8nF

47µF

6.3V

R_FREQ

31.6kΩ

Current-mode operation for excellent line and load transient

responses

10 μA shutdown current

Current limit and thermal overload protection

Soft start in 2048 clock cycles

AGND

_OSC= 600kHz

C1 = MURATA GRM31CR60J476M

_OUT3= SANYO POSCAP 6TPE150M

L1 = TOKO FDV0630-4R7M

M1 = VISHAY Si7882DP

D1 = VISHAY SSA33L

Figure 1. High Efficiency Output Boost Converter in Lossless Mode,

3.3 V Input, 5 V Output (Bootstrapped)

APPLICATIONS

APD bias

Portable electronic equipment

Isolated dc/dc converter

Step-up/step-down dc/dc converter

LED driver for laptop computer and navigation system

LCD backlighting

100

GENERAL DESCRIPTION

The ADP1621 is a fixed-frequency, pulse-width modulation

(PWM), current-mode, step-up converter controller. It drives an

external n-channel MOSFET to convert the input voltage to a

higher output voltage. The ADP1621 can also be used to drive

flyback, SEPIC, and forward converter topologies, either isolated

or nonisolated.

0.01

0.1

LOAD CURRENT (A)

Figure 2. Efficiency of Circuit Shown in Figure 1

The ADP1621 eliminates the use of a current-sense power

resistor by measuring the voltage drop across the on resistance

of the n-channel MOSFET. This technique, allowed up to a

maximum voltage of 30 V at the switch node, maximizes

efficiency and reduces cost. For switch-node voltages higher than

30 V or for more accurate current limiting, the CS pin can be

connected to a current-sense resistor in the source of the MOSFET.

The slope compensation is implemented by an external resistor,

allowing a wide range of external components (inductors and

MOSFETs), and can be chosen for various switching frequencies

and input and output voltages.

NPN pass transistor or a single resistor. The voltage of the

power input can be as low as 1 V for fuel cell applications. The

switching frequency is set by an external resistor over a range of

100 kHz to 1.5 MHz and can be synchronized to an external

clock by using the SDSN pin. The shutdown quiescent current is

less than 10 μA. The ADP1621 has a thermal shutdown feature

that shuts down the gate driver when the junction temperature

reaches approximately 150°C. The internal soft start circuit limits

inrush current at startup. The ADP1621 is available in the 10-lead

MSOP lead-free package and is specified over the −40°C to +125°C

junction temperature range.

The ADP1621 supply input voltage range is 2.9 V to 5.5 V, although

higher input voltages are possible with the use of a small-signal

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

12 3 4 5 6 7...32

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ADP1621ARMZ 替代型号

型号	品牌	替代类型	描述	数据表
ADP1621ARMZ-R7	ADI	功能相似	Constant-Frequency, Current-Mode Step-Up DC/DC Controller

与ADP1621ARMZ相关器件

型号	品牌	获取价格	描述	数据表
ADP1621ARMZ-R7	ADI	获取价格	Constant-Frequency, Current-Mode Step-Up DC/DC Controller
ADP1621-EVAL	ADI	获取价格	Constant-Frequency, Current-Mode Step-Up DC/DC Controller
ADP162ACBZ-1.2-R7	ADI	获取价格	Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators
ADP162ACBZ-1.8-R7	ADI	获取价格	Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators
ADP162ACBZ-2.1-R7	ADI	获取价格	Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators
ADP162ACBZ-2.3-R7	ADI	获取价格	Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators
ADP162ACBZ-2.8-R7	ADI	获取价格	Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators
ADP162ACBZ-3.0-R7	ADI	获取价格	Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators
ADP162ACBZ-4.2-R7	ADI	获取价格	Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators
ADP162AUJZ-1.5-R7	ADI	获取价格	Ultralow Quiescent Current, 150 mA, CMOS Linear Regulators

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