Document
AiT Semiconductor Inc.
www.ait-ic.com
A7506
600mA, 1.2MHz CONSTANT FREQUENCY SYNCHRONUS STEP-UP DC-DC CONVERTER
DESCRIPTION
FEATURES
The A7506 is synchronous, fixed frequency, step-up
High Efficiency: Up to 92%
DC/DC converters delivering high efficiency in a
1.2MHz Constant Switching Frequency
6-lead SOT package. Capable of supplying 3.3V at
3.3V Output Voltage at IOUT=100mA from a Single
100mA from a single AA cell input, the device
AA Cell; 5.0V Output Voltage at IOUT=500mA from
contain an internal NMOS switch and PMOS
one Li battery.
synchronous rectifier. A switching frequency of
Low Start-up Voltage: 0.85V
1.2MHz minimizes solution footprint by allowing the
Integrated main switch and synchronous rectifier.
use of tiny, low profile inductors and ceramic
No Schottky Diode Required
capacitors. The current mode PWM design is
2.5V to 5V Output Voltage Range
internally compensated, reducing external parts
Automatic Pulse Skipping Mode Operation
count. The A7506 features continuous switching at
Tiny External Components
light loads. Anti-ringing control circuitry reduces EMI
<1µA Shutdown Current
concerns by damping the inductor in discontinuous
Anti-ringing Control Reduces EMI
mode, and the device features low shutdown current
Available in SOT-26 Package.
of under 1A. The A7506 is available in SOT-26 Package.
APPLICATION
Cellular and Smart Phones
ORDER INFORMATION
Microprocessors and DSP Core Supplies Wireless and DSL Modems
Package Type
Part Number
SOT-26 Note
E6
A7506E6R-XXX A7506E6VR-XXX
XXX=Output
ADJ=Adjustable
V: Green Package
R : Tape & Reel
AiT provides all Pb free products Suffix “ V “ means Green Package
,
Typical Application Circuit
REV1.0 - APR 2009 RELEASED -
Fig 1. A7506-ADJ
-1-
AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
A7506
600mA, 1.2MHz CONSTANT FREQUENCY SYNCHRONUS STEP-UP DC-DC CONVERTER
Pin # 1 2 3
4 5 6
Symbol SW GND FB
SHDN VOUT VIN
Top View
Function Power Switch Pin. It is the switch node connection to Inductor. Ground Pin Feedback Input Pin. Connect FB to the center point of the external resistor divider. The feedback threshold voltage is 1.23V. Chip Shutdown Signal Input. Logic high is normal operation mode, Logic Low is Shutdown. Typically, this pin is connected to VIN through a 1mΩ resistor. Power Output Pin. VOUT is held 0.6V below than VIN in shutdown. Power Supply Input. Must be closely decoupled to GND, Pin 2, with a 4.7µF or greater ceramic capacitor.
REV1.0 - APR 2009 RELEASED -
-2-
AiT Semiconductor Inc.
www.ait-ic.com
A7506
600mA, 1.2MHz CONSTANT FREQUENCY SYNCHRONUS STEP-UP DC-DC CONVERTER
ABSOLUTE MAXIMUM RATINGS
Input voltage, VDD
-0.3V to +6V
SW Voltage
-0.3V to +6V
FB, SHDN Voltages
-0.3V to +6V
VOUT Voltage
-0.3V to +6V
Operating Temperature Range
40°C to +85°C
Storage Temperature Range
-65°C to +150°C
Lead Temperature (Soldering, 10s)
TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD) x (250°C/W).
+300°C
Stresses above 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 in the Electrical Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Thermal Resistance
Package
θJA
SOT26
250°C /W
Thermal Resistance is specified with approximately 1 square of 1 oz copper.
θJC 110°C /W
REV1.0 - APR 2009 RELEASED -
-3-
AiT Semiconductor Inc.
www.ait-ic.com
A7506
600mA, 1.2MHz CONSTANT FREQUENCY SYNCHRONUS STEP-UP DC-DC CONVERTER
ELECTRICAL CHARACTERISTICS
VIN =1.2V, VOUT=3.3V, TA = 25°C, Test Circuit of Fig 1., unless otherwise specified.
Parameter
Conditions
MIN TYP
Minimum Start-Up Voltage IOUT = 1mA
0.85
Minimum Operating Voltage VSHDN = VIN
0.5
Output Voltage Range
2.5
Feedback Voltage
–40oC ≤TA≤ 85oC
1.192 1.230
Quiescent Current(Shutdown) VSHDN = 0V
Quiescent Current(Active)
Measured on VOUT
0.01 300
NMOS Switch Leakage
VSW = 5V
0.1
PMOS Switch Leakage
VSW = 0V
0.1
VOUT = 3.3V NMOS Switch ON Resistance
VOUT = 5V
0.40 0.35
VOUT = 3.3V PMOS Switch ON Resistance
VOUT = 5V
0.70 0.60
Output Voltage
VOUT = 3.3V, IOUT = 1mA VOUT = 5V , IOUT = 1mA, VIN = 2.4V
3.201 4.850
3.300 5.000
Line Regulation
VIN = 0.8V to 3.0V, IOUT = 10mA
1
Load Regulation
IOUT = 1mA to 100mA
0.02
NMOS Current Limit
600 850
Current Limit Delay to Output
40
Max Duty Cycle
VFB = 1.15V, –40oC ≤TA≤ 85oC
80 85
Switching Frequency
–40oC ≤TA ≤85oC
0.85 1.2
SHDN Input Threshold
0.35 0.60
SHDN Input Current
VSHDN = 5.5V
0.01
MAX 1
0.65 5
1.268 1
500 5 5
3.399 5.150
1.5 1.50
1
unit V V V V µA µA µA µA Ω Ω Ω Ω V V %/V %/mA mA ns % MHz V µA
REV1.0 - APR 2009 RELEASED -
-4-
AiT Semiconductor Inc.
www.ait-ic.com
A7506
600mA, 1.2MHz CONSTANT FREQUENCY SYNCHRONUS STEP-UP DC-DC CONVERTER
TYPICAL PERFORMANCE .