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PDF APW7077A Data sheet ( Hoja de datos )
| Número de pieza | APW7077A | |
| Descripción | PWM Step-Up DC-DC Converter | |
| Fabricantes | Anpec Electronics Coropration | |
| Logotipo |  |
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APW7077/A
Features
• Low Start-up Voltage 0.9V
• Fixed 300kHZ Operating Frequency
• Built-In Internal Soft Start Circuit
• Low Operating Current
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• 3.3V and 5V (±2.5%) Fixed (APW7077) or
Adjustable Output Voltage (APW7077A)
• High Efficiency Up to 88% at 400mA
Output Current
• High Output Current Up to 1A
• Compact Package: SOT-23-5
• Lead Free Available (RoHS Compliant)
Applications
• Cellular and Portable Phones
• Portable Audio
• Camcorders and Digital Still Camera
• Hand-held Instrument
• PDAs
PWM Step-Up DC-DC Converter
General Description
The APW7077/A series are multi- function PWM
step-upDC-DCconverterwith anadaptive voltagemode
controller and higher efficiency application from one to
four cells battery packs. The APW7077/A series are
set PWM operating mode, voltage-mode to follow
portable application. And built-in driver pin, EXT pin,
for connecting to an external transistor or MOSFET
during light load, the device will automatically skip
switching cycles to maintain high efficiency. The
APW7077/A series consists of PWM controller,
reference voltage, phase compensation, oscillator,
soft-start, driver block. It will provide to operate suitable
voltage without external compensation circuit. The
APW7077/A series have fixed voltage and adjustable
voltage version from a wide input voltage ranges 0.7V
to 5.5V for step-up DC-DC converter. The start-up is
guaranteed at 1V and the device is operating down to
0.7V. And providing up to 300mA loading current.
Besides, low quiescent current (switch-off) is
guaranteed.
Pinouts
EXT GND
54
123
CE VOUT NC
SOT-23-5 (Top View)
APW7077
EXT GND
54
123
FB VDD CE
SOT-23-5 (Top View)
APW7077A
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Sep, 2005
1
www.anpec.com.tw
1 page  
APW7077/A
Electrical Characteristics (Cont.)
(for all values TA = 25°C, VOUT = 3.3V, unless otherwise noted)
Symbol
Parameter
Test Condition
APW7077
Min Typ Max
Step-Up Section
VIN
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Minimum Operating Input
Voltage
Operating Voltage
0.7
1 5.5
APW7077_33, Io<10mA
0.9
Start-up Voltage
APW7077_33, 10mA<Io<100mA
APW7077_50, Io<10mA
1.1
0.9
APW7077_50, 10mA<Io<100mA
1.1
VHOLD Hold Voltage
fSW Operating Frequency
DMAX Maximum Duty Cycle
Power MOSFET
ILOAD = 10mA
VOUT = 3.3VX96%
VOUT = 3.3VX96%
0.7 0.8
270 300 330
81 88 95
ISOURCE EXT Output Source Current Duty≤5%, EXT = 2.9V
ISINK EXT Output Sink Current Duty≤5%, EXT = 0.4V
Control Section
-70 -110 -150
80 120 160
VOUT
TSS
APW7077-33
IIN = 0mA
APW7077-50
IIN = 0mA
Soft-start Time
Soft-start Threshold Voltage Duty = 50%
3.218
4.875
10
3.3
5
25
1.65
3.383
5.125
40
Soft-start Hysteresis Voltage
150
Iq Operating Current
IOFF Stand-by Current
Switch-off Current
VCE Logic LOW (VIL)
Logic HIGH (VIH)
ICE CE Pin Input Current
VCE = VOUT, VOUT = 0.96VOUT
VCE = VOUT, VOUT = 1.04VOUT
VCE = VOUT, VOUT = 1.3VOUT
VCE = 0V
VCE = 0V
200 300
160 240
35 55
12
0.7
1.2
12
VCE = 2.0V
0.07 50
Unit
V
V
V
V
V
V
V
KHZ
%
mA
mA
V
V
ms
V
mV
µA
µA
µA
µA
V
V
µA
nA
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Sep, 2005
5
www.anpec.com.tw
5 Page 
APW7077/A
Typical Characteristics (Cont.)
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Feedback Voltage vs. Temperature
1.020
1.015
1.010
1.005
1.000
0.995
0.990
0.985
0.980
-40 -20
0
2 0 4 0 60 8 0
Temperature (°C)
Function Description
Operation
The APW7077/A series are low noise fixed frequency
voltage–mode PWM DC–DC controllers, and consist
of start–up circuit, reference voltage, oscillator, loop
compensation network, PWM control circuit, and low
ON resistance driver.
APW7077 provide on–chip feedback resistor and loop
compensation network, the system designer can get
the regulated fixed output voltage 3.3V and 5.0V with
a small number of external components, it is optimized
for battery powered portable products where large
output current is required. APW7077A provide internal
reference voltage 1.0V and output voltage setting by
external resistance for higher voltage requirement. The
quiescent current is typically 120uA (VOUT = 3.3V,
fsw = 300kHz), and can be further reduced to about
1.0uA when the chip is disabled (V < 0.7V).
CE
The APW7077/A operation can be best understood by
referring to the block diagram. The error amplifier
monitors the output voltage via the feedback resistor
divider by comparing the feedback voltage with the
reference voltage. When the feedback voltage is lower
than the reference voltage, the error amplifier output
will decrease. The error amplifier output is then
compared with the oscillator ramp voltage at the PWM
controller.
When the feedback voltage is higher than the reference
voltage, the error amplifier output increases and the
duty cycle decreases. When the external power switch
is on, the current ramps up in the inductor, storing
energy in the magnetic field. When the external power
switch is off, the energy stored in the magnetic field is
transferred to the output filter capacitor and the load.
The output filter capacitor stores the charge while the
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Sep, 2005
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet APW7077A.PDF ] | |
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