HM6310P212MR [HMSEMI]
3W, 0.85V Startup Voltage, Synchronous Step-Up Converter;型号: | HM6310P212MR |
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.
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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 IQ and light load PFM Mode
Internal Synchronous Rectifier
Current Mode control
Logic Control Shutdown and Thermal shutdown
SOT23-5 Package
APPLICATIONS
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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 IOUT
100%
80%
60%
40%
20%
0%
6.8μH
2.2nF *Needed if Vout=5V
4
5
IN
SW
VOUT
2.1,3.3V, 5V
1
OUT
4.7μF
VIN=3V
3
EN
HM6310
VIN=2.4V
VIN=1.8V
VIN=1.2V
6.3V
22μFx2
V
OUT=3.3V
GND
2
0.01
0.1
1
IOUT (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
EN
1
2
3
5
4
SW
IN
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
θJA θJC
SOT23-5……………………………………………..220…….…110 ........oC/W
SOT23-5
ELECTRICAL CHACRACTERISTICS
(VIN = 1.8V, VOUT = 3.3V, unless otherwise specified. Typical values are at TA = 25oC.)
PARAMETER
Minimum Input Voltage
Startup Voltage
CONDITIONS
MIN
TYP
0.6
0.85
2.1
MAX
UNITS
V
V
IOUT=0A
1.1
Output Voltage
VIN =1.8
3.3
5.0
40
0.5
2
V
Quiescent Current at IN
Shutdown Supply Current at IN
Switching Frequency
No Switching
VEN=GND
VIN<4.3V
μA
μA
MHz
%
Ω
Ω
A
A
μA
μA
μA
V
5
2.4
1.2
90
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
ISW =100mA
ISW =100mA
0.15
0.15
1.5
0.5
0.1
0.35
0.35
1.2
VEN=GND, Measure at IN pin
VOUT=5V,VSW=0 or 5V, VEN=GND
5
10
1
EN Input Current
EN Input Low Voltage
0.1
0.3
EN Input High Voltage
0.6
V
Thermal Shutdown
Rising, Hysteresis=10°C
165
°C
PIN DESCRIPTION
PIN #
NAME
OUT
GND
EN
IN
SW
DESCRIPTION
1
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
2
3
4
5
HM6310
TYPICAL CHARACTERISTICS
(Typical values are at TA = 25OC unless otherwise specified.)
Efficiency Vs IOUT
Efficiency Vs IOUT
Efficiency Vs IOUT
100%
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%
0%
VOUT=2.1V
VOUT=3.3V
VOUT=5V
0%
0%
0.01
0.1
1
0.01
0.1
1
0.01
0.1
1
IOUT (A)
IOUT (A)
IOUT (A)
Efficiency Vs VIN
VOUT Vs VIN
Maximum IOUT Vs VIN
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
1
0.8
0.6
0.4
0.2
0
3.298
3.296
3.294
3.292
3.29
IOUT=400mA
IOUT=100mA
IOUT=10mA
IOUT=100mA
2.5
VOUT=3.3V
V
OUT=3.3V
1.5
1
2
2.5
3
1
1.5
2
3
1
1.5
2
2.5
3
VIN (V)
VIN (V)
VIN (V)
VOUT Vs IOUT
No Load IQ Vs VIN
Frequency Vs VIN
3.4
3.38
3.36
3.34
3.32
3.3
100
90
80
70
60
50
40
30
20
10
2
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
VOUT=3.3V
0
1
0
0.2
0.4
0.6
1.5
2
2.5
3
3.5
1.5
2.5
3.5
4.5
IOUT (A)
VIN (V)
VIN (V)
HM6310
TYPICAL CHARACTERISTICS
(Typical values are at TA = 25OC unless otherwise specified.)
Short-Circuit Response
VIN=3V, VOUT=3.3V
Heavy load Switching Waveform
VIN=1.8V, VOUT=3.3V, IOUT= 500mA
Light load Switching Waveform
VIN=1.8V, VOUT=3.3V, IOUT= 10mA
VOUT AC
VOUT AC
20mV/div
VOUT
20mV/div
VSW
VSW
ISW
ISW
ISW
100ms/div
200s/div
500ns/div
Short-Circuit Recovery
VIN=3V, VOUT=3.3V
Start-Up Waveform
VIN=3.0V, VOUT=3.3V, IOUT= 500mA
Shut Down Waveform
VIN=3.0V, VOUT=3.3V, IOUT= 500mA
VEN
VEN
VOUT
VOUT
VOUT
VSW
VSW
ISW
ISW
ISW
500ns/div
5ms/div
5ms/div
Load Transient Response
Load Transient Response
Line Transient Response
VIN=3V, VOUT=3.3V IOUT=0.1A to 0.5A
VIN=3V, VOUT=3.3V IOUT=0.1A to 1A
V
OUT=3.3V, IOUT= 100mA VIN=1.2V to3V
VOUT
VOUT
VOUT
VIN
ISW
ISW
1ms/div
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 VOUT drops below VIN the 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 (VIN>VOUT) 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
EN
OUT
IN
UVLO &
Thermal
REF
shutdown
+
-
EA
+
-
PWM
Logic
Σ
COMP
network
SW
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.
V
IN
3.6V
6.8μH
4
5
2.2nF
IN
SW
VOUT, 5V
1
OUT
4.7μF
3
HM6310-50
EN
6.3V
22μF x2
GND
2
PACKAGE OUTLINE
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