HM7065 [HMSEMI]

5A, 500KHz Synchronous Boost Converter with Output Disconnect;


型号：	HM7065
厂家：	H&M Semiconductor
描述：	5A, 500KHz Synchronous Boost Converter with Output Disconnect
文件：	总7页 (文件大小：329K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

5A, 500KHz Synchronous Boost Converter

with Output Disconnect

HM7065 Series

 INTRODUCTION:

 FEATURES:

The HM7065 devices provide a power supply

solution for products powered by either a one-cell

Li-Ion or Li-polymer, or a two to three-cell alkaline,

NiCd or NiMH battery. The converter generates a

stable output voltage that is either adjusted by an

external resistor divider. It provides high efficient

power conversion and is capable of delivering

output currents up to 1.5A at 5V at a supply

voltage down to 2V.



97% Efficiency at V_OUT=5V from 3.3V Input

Device Quiescent Current: 37μA (Typ)

Guaranteed 2.5A Output Current at V_OUT=5V

from 3.3V Input

500kHz PWM Switching Frequency

Synchronous and Embedded Power

MOSFETs, No Schottky Diode Required

Low R_DS(ON)(main switch/synchronous switch)

at 5.0V output: 20/40mohm



The implemented boost converter is based on a

fixed switching frequency (500kHz typical),

current-mode controller using a synchronous

rectifier to obtain maximum efficiency. Boost

switch and rectifier switch are connected internally

to provide the lowest leakage inductance and best

EMI behavior possible. The current-mode control

scheme provides fast transient response and

good output voltage accuracy. At light load, the

converter will automatically enter into Pulse

Frequency Modulation (PFM) operation to reduce

the dominant switching losses. During PFM

operation, the IC consumes very low quiescent

current and maintains high efficiency over a wide

load current range.



Input Voltage Range: 1.8V to 5.25V

Adjustable Output Voltage Range:

from 2.5V to 5.5V

Pulse Frequency Modulation Operation for

Improved Efficiency at Low Output Power

Current Mode Operation with Internal

Compensation for Excellent Line and Load

Transient Response

Logic Controlled Shutdown(<1μA)

Load Disconnect During Shutdown

Automatic output discharge at shutdown:

HM7065A: Auto output discharge function



HM7065B: No output discharge function

Low Battery Comparator

Internal Soft-Start to Limit Inrush Current

Over Current Protection

Input Under Voltage Lockout

Output Over Voltage Protection

Over-Temperature Protection



The converter can be disabled to minimize battery

drain. During shutdown, the load is completely

disconnected from the battery.

The device allows use of small inductors and

output capacitors for USB devices.

Available in 2.1mm x 2.1mm QFN10 Package

 APPLICATIONS：



All Single Cell Li or Dual Cell Battery

Operated Products as Tablet PC, Smartbook

and Other Portable Equipment

Products including portable HDMI and USB-OTG

USB Hosts Without Native 5V Supplies

USB Charging Port (5V)

Power Bank, Battery Backup Units

Wireless Peripherals

Portable Audio Players



Personal Medical Devices

Industrial Metering Equipments

DC/DC Micro Modules

HM7065

5 A, 500KHz Synchronous Boost Converter with Output Disconnect

 ORDER INFORMATION

Operating free air

Output Voltage

Package

Device No.

temperature range

-40~+85°C

Adjustable

QFN2.1x2.1-10

HM7065A

HM7065B

-40~+85°C

 PIN CONFIGURATION:

Top View

(QFN2.1X2.1-10)

DESCRIPTION

TYPE⁽¹⁾

NO.

NAME

Chip Enable Input. Internal integrated with 1Mohm pull down resistor.

CE=High: Normal free running operation.

CE=Low: Shutdown; quiescent current <1μA. Output capacitor can be

completely discharged through the load or feedback resistors. An

anti-ringing switch is internally connected between SW and V_IN. If CE is

undefined, pin SW may ring.

LBI

Low Battery Comparator Input (comparator enabled with CE).

Battery Supply Input Voltage. The device gets its start-up bias from V_IN.

Once AV_OUTexceeds 2.3V, bias comes from AV_OUT. Thus, once started,

operation is completely independent from V_IN. Operation is only limited by

the output power level and the battery’s internal series resistance. The V_IN

pin should be connected to the positive terminal of the battery and

bypassed with a low ESR ceramic bypass capacitor. Care should be taken

to minimize the loop area formed by the bypass capacitor connections, the

V_INpin, and the HM7065 AGND pin. The minimum recommended bypass

capacitance is 1μF ceramic with a X5R or X7R dielectric and the optimum

placement is closest to the V_INpin and the AGND pin.

V_IN

PCB trace length from V_INto the input filter capacitor(s) should be as short

and wide as possible.

V0.4

Chipower Corp. Confidential- Prepared for Customer Use Only

2(8)

HM7065

5 A, 500KHz Synchronous Boost Converter with Output Disconnect

Power Ground. Ground connection for high-current power converter

node. High current return for the low-side driver and power main switch

N-MOSFET. Connect PGND with large copper areas directly to the input

and output supply returns and negative terminals of the input and output

filter capacitor(s).

PGND

Tie this pin to the ground island/plane through the lowest impedance

connection available.

Connect this pin to AGND.

Boost and Rectifying Switch Input. Connect an inductor between this

pin and V_IN. Keep the PCB trace lengths as short and wide as is practical

to reduce EMI and voltage overshoot. If the inductor current falls to zero,

or pin CE is low, an internal anti-ringing switch is connected from this pin

to V_INto minimize EMI.

DC-DC Power Output (Drain of the Internal Synchronous Rectifier

P-MOSFET). PCB trace length from PV_OUTto the output filter capacitor(s)

should be as short and wide as possible. Care should be taken to

minimize the loop area formed by the output filter capacitor(s)

connections, the PV_OUTpin, and the HM7065 PGND pin. The minimum

recommended output filter capacitance is 22μF ceramic with a X5R or

X7R dielectric and the optimum placement is closest to the PV_OUTpin and

the PGND pin. PV_OUTis completely disconnected from V_INwhen CE is low,

due to the output disconnect feature.

PV_OUT

IC Supply Voltage and Output Voltage Sense Input. Bias is derived

from AV_OUTwhen AV_OUTexceeds 2.3V. The AV_OUTpin should be

connected to the DC-DC power output pin, PV_OUT, and bypassed with a

low ESR ceramic bypass capacitor for noise immunity consideration. Care

should be taken to minimize the loop area formed by the bypass capacitor

connections, the AV_OUTpin, and the HM7065 AGND pin. The minimum

recommended bypass capacitance is 1μF ceramic with a X5R or X7R

dielectric and the optimum placement is closest to the AV_OUTpin and the

AGND pin.

AV_OUT

PCB trace length from AV_OUTto the output filter capacitor(s) should be as

short and wide as possible. AV_OUTis also completely disconnected from

V_INwhen CE is low, due to the output disconnect feature.

Feedback Input.

Feedback Input to the gm Error Amplifier. Connect resistor divider tap to

this pin.

The output voltage can be adjusted from 2.5V to 5.5V by:

V_OUT=1.2V•[1+(R1/R2)]

The feedback networks should be connected directly to a dedicated

analog ground plane and this ground plane must connect to the AGND

pin. If no analog ground plane is available, then the ground connection of

V0.4

Chipower Corp. Confidential- Prepared for Customer Use Only

3(8)

HM7065

5 A, 500KHz Synchronous Boost Converter with Output Disconnect

the feedback network must tie directly to the AGND pin. Connecting the

network to the PGND can inject noise into the system and effect

performance.

The feedback network, resistors R1 and R2 must be connected to FB pin

directly as closely as possible. And FB is a sensitive signal node, trace

area at FB pin should be small.

Please keep FB away from the inductor and SW switching node on the

PCB layout to minimize copper trace connections that can inject noise into

the system.

Analog Ground. The analog ground ties to all of the noise sensitive

signals. Provide a clean ground for the analog control circuitry and should

not be in the path of large currents.

AGND

LBO

Return for output voltage set resistor divider.

Connect this pin to PGND.

Low Battery Comparator Output (open drain).

(1) I = input; O = output; P = power

 ABSOLUTE MAXIMUM RATINGS⁽¹⁾

PARAMETER

CE Voltage⁽²⁾

Other Pins Voltage⁽²⁾

SYMBOL

RATINGS

V_OUT+0.3

UNITS

V_CE

Power Dissipation⁽³⁾

QFN2.1X2.1-10

P_D@T_A=25℃

2.5

°C /W

θ_JA

Package Thermal Resistance⁽⁴⁾

θ_JC

Operating Junction Temperature Range

Lead Temperature(Soldering, 10 sec)

Storage Temperature Range

T_j

150

260

°C

T_solder

T_stg

-65~150

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are

stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under

recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods

my affect device reliability.

(2) All voltages are with respect to network ground terminal.

(3) The maximum allowable power dissipation is a function of the maximum junction temperature T_J(MAX), the junction-to

ambient thermal resistance θ_JA, and the ambient temperature T_A. The maximum allowable continuous power dissipation at

any ambient temperature is calculated by P_D(MAX) = [ T_J(MAX)-T_A]/ θ_JA. Exceeding the maximum allowable power

dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal

shutdown circuitry protects the device from permanent damage.

(4) θ_JAis measured in the natural convection at T_A=25℃ on a four-layer Chipower Evaluation Board

HM7065

5 A, 500KHz Synchronous Boost Converter with Output Disconnect

 RECOMMENDED OPERATING CONDITIONS⁽⁵⁾

MIN NOM

MAX

5.25

5.5

UNITS

Supply voltage at V_IN

Output voltage at PV_OUT, AV_OUT

1.8

2.5

V_OUT+0.3

5.5

All other pins

Operating Ambient temperature range, T_A

Operating junction temperature range, T_j

(5) The device is not guaranteed to function outside its operating conditions.

-40

°C

125

 ELECTRICAL CHARACTERISTICS

(V_CE=V_IN=2.4V, V_OUT=5V, I_OUT=500mA, T_A=25°C , unless otherwise specified)

PARAMETER

SYMBOL

V_IN

CONDITIONS

MIN

1.8

TYP⁽⁶⁾

MAX UNITS

Input Supply Range

5.25

5.5

Output Voltage Range

Output Over Voltage Protection

Output Discharge Resistor

V_OUT

2.5

V_OVP

R_DSC

For HM7065A only

V_CE=V_IN=1.8V, V_OUT=5V, no load,

Measured on V_INpin

100

V_IN

Quiescent Current

V_OUT

μA

I_Q

V_CE=V_IN=1.8V, V_OUT=5V, no load,

Measured on V_OUTpin

Shutdown Current

I_SHDN

V_UVLO

V_CE=0V, V_IN=2.4V

0.1

μA

Input V_INUVLO Threshold

V_INUVLO Hysteresis

1.78

V_{UVLO_HYS}

0.1

0.75

0.7

_OUT≤1V

Linear Charge Current Limit⁽⁷⁾

I_CHARGE

1V<V_OUT<90%V_IN

Soft-start time

T_SS

V_CEH

V_CEL

CE High-Level Threshold

CE Low-Level Threshold

LBI Voltage Threshold

LBI Input Hysteresis

CE Rising

CE Falling

1.2

0.3

V_LBI

1.176

1.2

1.224

V_{LBI_HYS}

F_SW

KHz

Switching Frequency

500

1.2

Feedback Reference Voltage

Low Side Main N-FET R_ON

Synchronous P-FET R_ON

Maximum Duty Cycle

Main N-FET Current Limit^{(7) (8)}

Thermal Shutdown⁽⁷⁾

V_REF

1.182

1.218

R_NDS(ON)

R_PDS(ON)

D_MAX

I_LIM1

V_OUT=5V

mΩ

D=44%, V_IN=2.8V, V_OUT=5V

5.0

T_SD

150

°C

Thermal Shutdown Hysteresis⁽⁷⁾

°C

T_HYS

(6) Typical numbers are at 25°C and represent the most likely norm.

(7) Specification is guaranteed by characterization and not 100% tested in production.

(8) Duty cycle affects current limit due to ramp generator.

HM7065

5 A, 500KHz Synchronous Boost Converter with Output Disconnect

 TYPICAL APPLICATION CIRCUIT

100KΩ

LBO

V_IN

LBI

AV_OUT

PV_OUT

0Ω

1μF

V_OUT=5V

V_BAT

0.1Ω

22μF/ 6.3V

V_IN:1.8V~4.35V

1.5μH

300KΩ

HM7065

22μF

470KΩ

22μF 22μF

100μF

200KΩ

148.4KΩ

PGND AGND

Figure 1 Standard Application Circuit

HM7065

5 A, 500KHz Synchronous Boost Converter with Output Disconnect

 PACKAGING INFORMATION



QFN2.1X2.1-10 Package Outline Dimensions

HM7065 [HMSEMI]

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