HM6310P332MR [HMSEMI]

3W, 0.85V Startup Voltage, Synchronous Step-Up Converter;


型号：	HM6310P332MR
厂家：	H&M Semiconductor
描述：	3W, 0.85V Startup Voltage, Synchronous Step-Up Converter
文件：	总6页 (文件大小：499K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

HM6310

3W, 0.85V Startup Voltage, Synchronous Step-Up Converter with

Real-Shutdown and Short-Circuit Protection in SOT23-5

DESCRIPTION

FEATURES

The HM6310 is a high efficiency synchronous step-up

converter that can provide up to 3W of power to a boosted

output from a low voltage source. Unlike most step-up

converter, not only it starts up at a very low input voltage

as low as 0.85V, it also incorporates circuits that

disconnect the input from output, during shutdown,

short-circuit, output current overloading, or other events

when output is higher than the input. This eliminates the

need for an external MOSFET and its control circuitry to

disconnect the input from output, and provides robust

output overload protection. The HM6310 starts up from a

voltage as low as 0.85V making it ideal for applications with

single-cell or two-cell alkaline, NiCd, and NiMh batteries. A

switching frequency of 2MHz minimizes solution footprint

by allowing the use of tiny and low profile inductors and

ceramic capacitors. An internal synchronous MOSFET

provides highest efficiency and with a current mode

control that is internally compensated, external parts

count is reduced to minimal. HM6310 is available in

three output voltage options. They are 2.1V, 3.3V and 5V. It

is housed in a tiny SOT23-5 package.

Output Disconnect

Short-circuit Protection

3W Output Power

Output to Input Reversed Current Protection

0.85V Low Start-up Voltage

VIN range from 0.6V to 4.5V

Up to 96% Efficiency

40μA No load I_Qand light load PFM Mode

Internal Synchronous Rectifier

Current Mode control

Logic Control Shutdown and Thermal shutdown

SOT23-5 Package

APPLICATIONS

USB OTG for MIDs, Smartphones

Mobile back-up Battery Chargers

Alkaline, NiCd, and NiMh batteries applications

USB powered devices

ORDERING INFORMATION

PART #

Output Voltage TOP MARK

HM6310P502MR 5.0V

HM6310P332MR 3.3V

CPYW

DzYW

DaYW

HM6310P212MR

2.1V

TYPICAL APPLICATION

Efficiency Vs I_OUT

100%

80%

60%

40%

20%

6.8μH

2.2nF *Needed if Vout=5V

V_OUT

2.1,3.3V, 5V

OUT

4.7μF

VIN=3V

HM6310

VIN=2.4V

VIN=1.8V

VIN=1.2V

6.3V

22μFx2

_OUT=3.3V

GND

0.01

0.1

I_OUT(A)

HM6310

PIN CONFIGURATION

ABSOLUTE MAXIMUM RATINGS

(Note: Exceeding these limits may damage the device. Exposure to absolute

maximum rating conditions for long periods may affect device reliability.)

OUT

GND

SW Voltage........................................................-0.3V to 5.5V

All Other PIN Voltages……………………………..–0.3V to 5V

SW to ground current ………….…….……….......Internally limited

Operating Temperature Range ……................…–40°C to 85°C

Storage Temperature Range ………………..….–55°C to 150°C

HM6310

Thermal Resistance

θ_JAθ_JC

SOT23-5……………………………………………..220…….…110 ........^oC/W

SOT23-5

ELECTRICAL CHACRACTERISTICS

(V_IN= 1.8V, V_OUT= 3.3V, unless otherwise specified. Typical values are at TA = 25^oC.)

PARAMETER

Minimum Input Voltage

Startup Voltage

CONDITIONS

MIN

TYP

0.6

0.85

2.1

MAX

UNITS

I_OUT=0A

1.1

Output Voltage

V_IN=1.8

3.3

5.0

0.5

Quiescent Current at IN

Shutdown Supply Current at IN

Switching Frequency

No Switching

V_EN=GND

V_IN<4.3V

μA

MHz

Ω

μA

2.4

1.2

Maximum Duty Cycle

NMOS Switch On Resistance

PMOS Switch On Resistance

NMOS Switch Current Limit

Start-up Current Limit

Output to Input Reverse Leakage Current

SW Leakage Current

I_SW=100mA

0.15

1.5

0.5

0.1

0.35

1.2

V_EN=GND, Measure at IN pin

V_OUT=5V,V_SW=0 or 5V, V_EN=GND

EN Input Current

EN Input Low Voltage

0.1

0.3

EN Input High Voltage

0.6

Thermal Shutdown

Rising, Hysteresis=10°C

165

°C

PIN DESCRIPTION

PIN #

NAME

OUT

GND

DESCRIPTION

Output pin. Bypass with a 22μF or larger ceramic capacitor closely between this pin and GND

Ground Pin

Enable pin for the IC. Drive this pin high to enable the part, low to disable.

Input Supply Voltage. Bypass with a 4.7μF ceramic capacitor to GND

Inductor Connection. Connect an inductor Between SW and the regulator output

HM6310

TYPICAL CHARACTERISTICS

(Typical values are at TA = 25^OC unless otherwise specified.)

Efficiency Vs I_OUT

100%

90%

80%

70%

60%

50%

40%

30%

20%

10%

100%

90%

80%

70%

60%

50%

40%

30%

20%

10%

90%

80%

70%

60%

50%

40%

VIN=3V

VIN=1.9V

30%

VIN=2.5V

VIN=3.6V

VIN=4.2V

VIN=2.4V

VIN=1.8V

VIN=1.2V

VIN=1.5V

VIN=0.9V

20%

10%

V_OUT=2.1V

V_OUT=3.3V

V_OUT=5V

0.01

0.1

0.01

0.1

0.01

0.1

I_OUT(A)

Efficiency Vs V_IN

V_OUTVs V_IN

Maximum I_OUTVs V_IN

100%

95%

90%

85%

80%

75%

70%

65%

60%

3.31

3.308

3.306

3.304

3.302

3.3

1.6

1.4

1.2

0.8

0.6

0.4

0.2

3.298

3.296

3.294

3.292

3.29

IOUT=400mA

IOUT=100mA

IOUT=10mA

IOUT=100mA

2.5

VOUT=3.3V

_OUT=3.3V

1.5

2.5

1.5

2.5

V_IN(V)

V_OUTVs I_OUT

No Load I_QVs V_IN

Frequency Vs V_IN

3.4

3.38

3.36

3.34

3.32

3.3

100

1.9

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

3.28

3.26

3.24

3.22

3.2

VIN=1.8V

VOUT=3.3V

0.2

0.4

0.6

1.5

2.5

3.5

1.5

2.5

3.5

4.5

I_OUT(A)

V_IN(V)

HM6310

TYPICAL CHARACTERISTICS

(Typical values are at TA = 25^OC unless otherwise specified.)

Short-Circuit Response

V_IN=3V, V_OUT=3.3V

Heavy load Switching Waveform

V_IN=1.8V, V_OUT=3.3V, I_OUT= 500mA

Light load Switching Waveform

V_IN=1.8V, V_OUT=3.3V, I_OUT= 10mA

V_OUTAC

20mV/div

V_OUT

20mV/div

V_SW

I_SW

100ms/div

200s/div

500ns/div

Short-Circuit Recovery

V_IN=3V, V_OUT=3.3V

Start-Up Waveform

V_IN=3.0V, V_OUT=3.3V, I_OUT= 500mA

Shut Down Waveform

V_IN=3.0V, V_OUT=3.3V, I_OUT= 500mA

V_EN

V_OUT

V_SW

I_SW

500ns/div

5ms/div

Load Transient Response

Line Transient Response

V_IN=3V, V_OUT=3.3V I_OUT=0.1A to 0.5A

V_IN=3V, V_OUT=3.3V I_OUT=0.1A to 1A

_OUT=3.3V, I_OUT= 100mA V_IN=1.2V to3V

V_OUT

V_IN

I_SW

1ms/div

2ms/div

HM6310

FUNCTIONAL DECRIPTIONS

Loop Operation

The HM6310 is a wide input range, high-efficiency, DC-to-DC step-up switching regulator, capable of delivering up to 3W of

output power, integrated with a 150mΩ high side MOSFET and 150 mΩ synchronous rectifier. It uses a PWM current-mode

control scheme. An error amplifier integrates error between the FB signal and the internal reference voltage. The output of the

integrator is then compared to the sum of a current-sense signal and the slope compensation ramp. This operation generates a

PWM signal that modulates the duty cycle of the power MOSFETs to achieve regulation for output voltage.

Light Load Operation

Traditionally, a fixed constant frequency PWM DC-DC regulator always switches even when the output load is small. When

energy is shuffling back and forth through the power MOSFETs, power is lost due to the finite RDSONs of the MOSFETs and

parasitic capacitances. At light load, this loss is prominent and efficiency is therefore very low. HM6310 employs a proprietary

control scheme that improves efficiency in this situation by enabling the device into a power save mode during light load,

thereby extending the range of high efficiency operation.

Short-Circuit Protection

Unlike most step-up converters, the HM6310 allows for short circuits on the output. In the event of a short circuit, the device

first turns off the NMOS when the sensed current reaches the current limit. After V_OUTdrops below V_INthe device then enters a

linear charge period with the current limited same as with the start-up period. In addition, the thermal shutdown circuits

disable switching if the die temperature rises above 165°C.

Down Mode (V_IN>V_OUT) Operation

The HM6310 will continue to supply the output voltage even when the input voltage exceeds the output voltage. Since the PMOS

no longer acts as a low-impedance switch in this mode, power dissipation increases within the IC to cause a sharp drop in

efficiency. Limit the maximum output current to maintain an acceptable junction temperature.

BLOCK DIAGRAM

OUT

UVLO &

Thermal

REF

shutdown

PWM

Logic

COMP

network

DRIVER

OSC

Slope Comp

GND

HM6310

5V APPLICATIONS

For HM6310-50, the 5V output voltage option, in order to maintain an acceptable peak voltage at SW, a small parallel capacitor

snubber between SW and OUT is necessary, and an output cap of greater than 44μF is also required as shown in below figure.

3.6V

6.8μH

2.2nF

V_OUT,5V

OUT

4.7μF

HM6310-50

6.3V

22μF x2

GND

PACKAGE OUTLINE

相关型号：