HM7065B [HMSEMI]
5A, 500KHz Synchronous Boost Converter with Output Disconnect;型号: | HM7065B |
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 VOUT=5V from 3.3V Input
Device Quiescent Current: 37μA (Typ)
Guaranteed 2.5A Output Current at VOUT=5V
from 3.3V Input
500kHz PWM Switching Frequency
Synchronous and Embedded Power
MOSFETs, No Schottky Diode Required
Low RDS(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
1
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
Adjustable
QFN2.1x2.1-10
QFN2.1x2.1-10
HM7065A
HM7065B
-40~+85°C
PIN CONFIGURATION:
Top View
9
10
8
7
1
6
2
3
5
4
(QFN2.1X2.1-10)
DESCRIPTION
PIN
TYPE(1)
NO.
1
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 VIN. If CE is
undefined, pin SW may ring.
CE
I
I
2
LBI
Low Battery Comparator Input (comparator enabled with CE).
Battery Supply Input Voltage. The device gets its start-up bias from VIN.
Once AVOUT exceeds 2.3V, bias comes from AVOUT. Thus, once started,
operation is completely independent from VIN. Operation is only limited by
the output power level and the battery’s internal series resistance. The VIN
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
VIN pin, 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 VIN pin and the AGND pin.
3
VIN
I
PCB trace length from VIN to 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).
4
5
PGND
P
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 VIN. 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 VIN to minimize EMI.
SW
I
DC-DC Power Output (Drain of the Internal Synchronous Rectifier
P-MOSFET). PCB trace length from PVOUT to 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 PVOUT pin, 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 PVOUT pin and
the PGND pin. PVOUT is completely disconnected from VIN when CE is low,
due to the output disconnect feature.
6
PVOUT
O
IC Supply Voltage and Output Voltage Sense Input. Bias is derived
from AVOUT when AVOUT exceeds 2.3V. The AVOUT pin should be
connected to the DC-DC power output pin, PVOUT, 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 AVOUT pin, 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 AVOUT pin and the
AGND pin.
7
AVOUT
I
PCB trace length from AVOUT to the output filter capacitor(s) should be as
short and wide as possible. AVOUT is also completely disconnected from
VIN when 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:
VOUT =1.2V•[1+(R1/R2)]
8
FB
I
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.
9
AGND
LBO
I
Return for output voltage set resistor divider.
Connect this pin to PGND.
10
O
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
VOUT+0.3
6
UNITS
VCE
V
V
Power Dissipation(3)
QFN2.1X2.1-10
PD@TA=25℃
2.5
W
50
10
°C /W
°C /W
θJA
Package Thermal Resistance(4)
θJC
Operating Junction Temperature Range
Lead Temperature(Soldering, 10 sec)
Storage Temperature Range
Tj
150
260
°C
°C
°C
Tsolder
Tstg
-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 TJ (MAX), the junction-to
ambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = [ TJ(MAX)-TA ]/ θJA. 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) θJA is measured in the natural convection at TA=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 VIN
Output voltage at PVOUT, AVOUT
CE
1.8
2.5
0
V
V
VOUT+0.3
5.5
V
All other pins
0
V
Operating Ambient temperature range, TA
Operating junction temperature range, Tj
(5) The device is not guaranteed to function outside its operating conditions.
-40
-40
85
°C
°C
125
ELECTRICAL CHARACTERISTICS
(VCE=VIN=2.4V, VOUT=5V, IOUT=500mA, TA=25°C , unless otherwise specified)
PARAMETER
SYMBOL
VIN
CONDITIONS
MIN
1.8
TYP(6)
MAX UNITS
Input Supply Range
5.25
5.5
V
V
V
Ω
Output Voltage Range
Output Over Voltage Protection
Output Discharge Resistor
VOUT
2.5
VOVP
6
RDSC
For HM7065A only
VCE=VIN=1.8V, VOUT=5V, no load,
Measured on VIN pin
100
VIN
Quiescent Current
VOUT
10
μA
μA
IQ
VCE=VIN=1.8V, VOUT=5V, no load,
Measured on VOUT pin
27
Shutdown Current
ISHDN
VUVLO
VCE=0V, VIN=2.4V
0.1
1
μA
V
Input VIN UVLO Threshold
VIN UVLO Hysteresis
1.78
VUVLO_HYS
0.1
0.75
0.7
1
V
V
OUT≤1V
Linear Charge Current Limit(7)
ICHARGE
A
1V<VOUT<90%VIN
Soft-start time
TSS
VCEH
VCEL
ms
V
CE High-Level Threshold
CE Low-Level Threshold
LBI Voltage Threshold
LBI Input Hysteresis
CE Rising
CE Falling
1.2
0.3
V
VLBI
1.176
1.2
20
1.224
V
VLBI_HYS
FSW
mV
KHz
V
Switching Frequency
500
1.2
20
Feedback Reference Voltage
Low Side Main N-FET RON
Synchronous P-FET RON
Maximum Duty Cycle
Main N-FET Current Limit(7) (8)
Thermal Shutdown(7)
VREF
1.182
1.218
RNDS(ON)
RPDS(ON)
DMAX
ILIM1
VOUT=5V
VOUT=5V
mΩ
mΩ
%
40
90
95
D=44%, VIN=2.8V, VOUT=5V
5.0
A
TSD
150
20
°C
Thermal Shutdown Hysteresis(7)
°C
THYS
(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
R5
100KΩ
R7
LBO
VIN
SW
LBI
AVOUT
PVOUT
0Ω
C6
C8
1μF
1μF
L1
VOUT=5V
C9
VBAT
0.1Ω
22μF/ 6.3V
VIN:1.8V~4.35V
1.5μH
300KΩ
R1
HM7065
C4
22μF
R3
470KΩ
C1
22μF 22μF
C2
FB
100μF
R4
200KΩ
R2
148.4KΩ
CE
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
相关型号:
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