ACE707C - ACE Technology Co., LTD.

ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
Description
The ACE707C is a step-up converter that provides a boosted output voltage from a low voltage source.
Because of its proprietary design, it starts up at a very low input voltage down to 0.9V, and only
consumes 15uA at standby, making it an ideal choice for single cell alkaline/NiMH battery operations.
A switching frequency of 1MHz minimizes solution footprint by allowing the use of tiny, low profile
inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing
external parts count. ACE707C is available in SOT-23 and SOT89-3 Package.
Features
•
•
•
•
•
•
•
•
•
•
•
Efficiency up to [email protected]=3.3V, Vout=5.5V
Typical 15uA standby current
1MHz Switching Frequency allows small inductor and output cap
Input boost-strapping allows using small or no input cap
Low Vin Start-up Voltage down to 0.9V Ideal for Single Alkaline Cell operations
Maximum Output Current up to 300mA
Low Noise PWM control
Internally Compensated Current Mode Control
Internal Synchronous Rectifier
Logic Control Shutdown (IQ<1uA)
Available in SOT-23 and SOT89-3
Application
•
•
•
•
•
One to Three Cell Battery Operated Devices
Medical Instruments
Bluetooth Headsets
Flash-Based MP3 Players
Noise Canceling Headphones
Absolute Maximum Ratings
Parameter
Value
SW Voltage
-0.3 ~ 6V
OUT Voltage
-0.3 ~ 6V
Max Operating Junction Temperature(Tj)
Maximum Power Dissipation
125°C
SOT-23
450mW
SOT89-3
500mW
Ambient Temperature(Ta)
-40°C– 85°C
Storage Temperature(Ts)
-55°C - 150°C
Lead Temperature & Time
260°C, 10S
Note: Exceed these limits to damage to the device.
Exposure to absolute maximum rating conditions may affect device reliability.
VER 1.1
1
ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
Packaging Type
SOT-23
SOT89-3
Description
SOT-23 SOT-89-3 NAME
1
1
GND
2
3
SW
3
2
OUT
Ground
To connect inductor to VIN
Output voltage pin, with 10uF ceramic capacitor
closely connected to GND
Ordering information
ACE707C XX + H
Halogen - free
Pb - free
BM: SOT-23
AM:SOT-89-3
VER 1.1
2
ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
Block Diagram
Typical Application Circuit
Note: Input capacitor (Cin=0.47uF) and Output capacitor (Cout≥4.7uF) are recommended in all application circuit.
VER 1.1
3
ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
Detail Description
ACE707C is a low input voltage start up, current mode DC-DC step up converter. It’s operation can be
best understood by referring to the block diagram. Upon starting up, the low voltage startup circuitry drives
SW with on-off cycles, transferring energy from input to OUT by storing energy in the inductor during
on-time and releasing it to the output during off-time. When OUT reaches 2V, the startup circuit turns off
and the main controller takes over. The main control loop consists of a reference, a GM error amplifier, a
PWM controller, a current sense amplifier, an oscillator, a PWM logic control, and it is power stage
including its driver. The main control loop is a classic current mode control loop. The GM stage integrates
the error between FB and REF, and its output is used to compare with a triangular wave which the
summing result of the current sense amplifier output and a slope compensation voltage. The output of the
comparator is used to drive the power stage to reach regulation.
Application Information
Inductor selection
With switching frequency up to 1MHz, small surface mount inductors can be used with values from
2.2uH to 4.7uH. For a given chosen inductor value and application conditions make sure the peak
inductor current does not exceed the maximum current rating of the selected vendor's inductor.
Input and output capacitor selection
The ACE707C's bootstrap architecture allows the use of very small input capacitor. For applications
that only need to drive small output load current, the input capacitor is optional, because once output is
started up, the IC's is powered by OUT, a quiet power supply.
The output capacitor is used to stabilize the loop and provide ac current to the load. A low ESR ceramic
cap with values from 2.2uF to 22uF can be used. Smaller value capacitors are generally cheaper with
small footprints, while larger capacitor provides lower ripples and better transient load responses. Also,
when extreme low startup voltage is needed, larger output capacitors are needed for the part to startup
under heavy load condition.
VER 1.1
4
ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
Electrical Characteristics
O
(TA=25 C)
Symbol
Vin
Parameter
Conditions
Input Voltage Range
Min
Typ
0.9
Vstart
Startup Voltage
Iout = 1mA
0.9
Vhold
Hold Voltage
Iout = 50mA
0.5
Vout
Output Voltage Range
1.8
Max
Unit
5
V
V
0.7
V
5.5
V
Output voltage accuracy
Iout = 0mA
2
Line regulation
Iout = 50mA
0.1
0.2
%/V
Load regulation
Iout = 0~300mA
1
2
%
Switching Frequency
Vout=0.95Vo, No inductor
0.7
1
1.4
MHz
Max Duty cycle
Vout=0.95Vo, No inductor
85
90
95
%
Quiescent Current at Vout
Vout=1.05*Vo
5
8
15
uA
Supply current at Vin
Iout = 0mA
20
uA
Efficiency
Iout = 100mA
RdsonP
PMOS Rdson
Isw =100mA
400
600
mohm
RdsonN
NMOS Rdson
Isw =100mA
200
300
mohm
SW Leakage Current
Vout=5.2V, Vsw=0 or 5.2V
1
uA
Fsoc
%
IQ
Iswlk
85
%
VER 1.1
5
ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
ELECTRICAL PERFORMANCE
O
Tested under Cin=Cout=10uF, L=2.2uH, TA=25 C , unless otherwise specified
VER 1.1
6
ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
ELECTRICAL PERFORMANCE
O
Tested under Cin=Cout=10uF, L=2.2uH, TA=25 C , unless otherwise specified
VER 1.1
7
ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
Packing Information
SOT-23-3
SOT-89-3
VER 1.1
8
ACE707C
0.9 V startup, 1MHz, 300mA Iout, Low Iq, Synchronous Boost Converter
Notes
ACE does not assume any responsibility for use as critical components in life support devices or systems
without the express written approval of the president and general counsel of ACE Electronics Co., LTD.
As sued herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and shoes failure to perform when properly used in
accordance with instructions for use provided in the labeling, can be reasonably expected to result in
a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can
be reasonably expected to cause the failure of the life support device or system, or to affect its safety
or effectiveness.
ACE Technology Co., LTD.
http://www.ace-ele.com/
VER 1.1
9