Datasheet > MIC5157

MIC5157

更新时间： 2024-11-27 14:54:11

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
13页	271K
描述
The MIC5156, MIC5157, and MIC5158 Super Low-Dropout (LDO) Regulator Controllers are single IC

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MIC5157 数据手册

MIC5156/5157/5158

Micrel, Inc.

MIC5156/5157/5158

Super LDO™ Regulator Controller

either 3.3V, 5.0V, or 12V. The MIC5158 can be conﬁgured

as a ﬁxed 5V controller or programmed to any voltage from

1.3V to 36V using two external resistors.

General Description

The MIC5156, MIC5157, and MIC5158 Super Low-Dropout

(LDO) Regulator Controllers are single IC solutions for high-

current low-dropout linear voltage regulation. Super LDO™

Regulators have the advantages of an external N-channel

power MOSFET as the linear pass element.

The MIC5156 is available in an 8-pin DIP or SOIC. The

MIC5157 and MIC5158 are available in a 14-pin DIPor SOIC

which operate from –40°C to +85°C.

The MIC5156/7/8 family features a dropout voltage as low

as the R

of the external power MOSFET multiplied by

DS(ON)

Features

• 4.5mA typical operating current

• <1µA typical standby current

• Low external parts count

• Optional current limit (35mV typical threshold)

• 1% initial output voltage tolerance in most conﬁgurations

• 2% output voltage tolerance over temperature

• Fixed output voltages of 3.3V, 5.0V (MIC5156)

• Fixed output voltages of 3.3V, 5.0V, 12V (MIC5157)

• Programmable (1.3 to 36V) with 2 resistors (MIC5156/8)

• Internal charge pump voltage tripler (MIC5157/8)

• Enable pin to activate or shutdown the regulator

• Internal gate-to-source protective clamp

• All versions available in DIP and SOIC

the output current. The output current can be as high as the

largest MOSFETs can provide.

The MIC5156/7/8 family operates from 3V to 36V. The

MIC5156 requires an external gate drive supply to provide

the higher voltage needed to drive the gate of the external

MOSFET. The MIC5157 and MIC5158 each have an inter-

nal charge pump tripler to produce the gate drive voltage.

The tripler is capable of providing enough voltage to drive a

logic-level MOSFET to 3.3V output from a 3.5V supply and

is clamped to 17.5V above the supply voltage. The tripler

requires three external capacitors.

The regulator output is constant-current limited when the

controller detects 35mV across an optional external sense

resistor. An active-low open-collector ﬂag indicates a low

voltage of 8% or more below nominal output. A shutdown

(low) signal to the TTL-compatible enable control reduces

controller supply current to less than 1µA while forcing the

output voltage to ground.

Applications

• Ultrahigh current ultralow dropout voltage regulator

• Constant high-current source

• Low parts count 5.0V to 3.3V computer supply

• Low noise/low-dropout SMPS post regulator

• High-current, current-limited switch

The MIC5156-3.3 and MIC5156-5.0 controllers have inter-

nally ﬁxed output voltages. The MIC5156 [adjustable] output

is conﬁgured using two external resistors. The MIC5157 is a

ﬁxed output controller which is externally conﬁgured to select

Typical Applications

+12V

1.0µF

0.1µF

Enable

Shutdown

MIC5157

MIC5156-3.3

10 11 12 13 14

0.1µF

Enable

3mΩ

R_S

3mΩ

R_S

Shutdown

V_IN

V_OUT

3.3V, 10A

V_OUT

3.3V, 10A

V_IN

(3.61Vmin.)

C_L*

47µF

C_L*

47µF

R_S= 0.035V /I_LIMIT

*Improves transient

SMP60N03-10L

response to load changes

IRLZ44 (Logic Level MOSFET) response to load changes

10A 5V to 3.3V Desktop Computer Regulator

10A Low-Dropout Voltage Regulator

Super LDO is a trademark of Micrel, Inc.

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

August 2005

MIC5156/5157/5158

12 3 4 5 6 7...13

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与MIC5157相关器件

型号	品牌	获取价格	描述	数据表
MIC5157BM	MICREL	获取价格	Super LDOâ¢ Regulator Controller
MIC5157BM	ROCHESTER	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO14, SOIC-14
MIC5157BM	MICROCHIP	获取价格	Analog Circuit, 1 Func, PDSO14, SOIC-14
MIC5157BN	MICREL	获取价格	Super LDOâ¢ Regulator Controller
MIC5157BN	MICROCHIP	获取价格	Analog Circuit, 1 Func, PDIP14, DIP-14
MIC5157YM	MICREL	获取价格	Super LDOâ¢ Regulator Controller
MIC5157YMTR	MICREL	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO14, LEAD FREE, SOIC-14
MIC5157YN	MICROCHIP	获取价格	SPECIALTY ANALOG CIRCUIT, PDIP14
MIC5158	MICROCHIP	获取价格	The MIC5156, MIC5157, and MIC5158 Super Low-Dropout (LDO) Regulator Controllers are sing
MIC5158AJ	MICROCHIP	获取价格	Analog Circuit, 1 Func, CDIP14, CERDIP-14

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