Document
APW7215
Fixed 600kHz Step-UP Converter for White LEDs
Features
General Description
• Wide Input Voltage from 2.7V to 6V • Fixed 600kHz Switching Frequency • Reference Voltage : 0.2V • PWM brightness control with wide frequency
range of 5KHz to 100KHz • Build-in Power MOSFET: 0.3Ω • Over-Voltage Protection • Under Voltage Lockout Protection • Over Temperature Protection • <1µA Quiescent Current during Shutdown • TDFN2x2-6 Package • Halogen and Lead Free Available (RoHS
Compliant)
Applications
Th e APW72 15 is a current-mod e and fixed freq uen cy 600kHz boost converter with an integrated N-FET to drive white LEDs. The series connection allows the LED current to be identical for uniform brightness.Its low on-resistance of NFET and low feedback voltage reduce power loss and achieve high efficiency. 600kHz Constant switching frequency allows using small-size inductor and both ofinput and output capacitors. An over voltage protection function, which m onitors the output voltage via LX pin, s tops s witching of the IC if the LXvoltage exceeds the over voltage threshold. An internal soft-start circuit eliminates the inrush current during start-up. The APW7215 also integrates under-voltage lockout and over-temperature protection to protect the IC in abnormal co ndi ti ons . The APW72 15 is avai lab le in TD FN2 x2 -6 package.
• White LED Display Backlighting • Cell Phone and Smart Phone • PDA, PMP, MP3 • Digital Camera
Simplified Application Circuit
Pin Configuration
FB 1 NC 2 GND 3
6 VIN 5 EN 4 LX
APW7215 TDFN 2x2-6 Top View
VIN
L1
22 µH
VOUT
C1 1 µF
VIN
LX
C2
1µF
10 strings
GND
EN
FB
PWM Dimming
R1
ANP EC res erves the right to ma ke cha nges to imp rove relia bility or m anufac turab ility witho ut no tice, and advise customers to obtain the latest version of relevant information to verify before placing orders.
C opyright © ANPEC Electronics C orp.
1
Rev. A.3 - Oct., 2015
www.anpec.com.tw
APW7215
Ordering and Marking Information
Assembly Material G : Halogen and Lead Free Device
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; w hich are fully compliant w ith RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020Dfor MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-fr ee (RoHS compliant) and halogen free (Br or Cl does not exceed 900ppm by w eight in homogeneous material and total of Br and Cl does not exceed 1500ppm by w eight).
Absolute Maximum Ratings (Note 1)
Symbol
Parameter
Rating
Unit
V IN
VIN Pin to GND
-0.3 to 7
V
FB and EN to GND
-0.3 ~ VIN
V
VLX
LX Pin to GND
-0.3 to 40
V
PD
Power Dissipation
Internally Limit
W
TJ
Maximum Junction Temperature
150
°C
TSTG
Storage Temperature Range
-65 to 150
°C
TSDR
Maximum Lead Soldering Temperature, 10 Seconds
260
°C
Note1: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only and functional oper ation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute maximumrating conditions for extended periods may affect device reliability
Thermal Characteristics
Symbol
Parameter
Typical Value
Unit
θJA
Junction-to-Ambient Resistance in free air (Note 2)
θJC
Junction-to-Case Resistance
TDFN2x2-6
165
TDFN2x2-6
20
oC/W oC/W
Note 2: θ is measured w ith the component mounted on a high effective thermal conductivity test board in free air. JA
C opyright © ANPEC Electronics C orp.
2
Rev. A.3 - Oct., 2015
www.anpec.com.tw
APW7215
Recommended Operating Conditions (Note 3)
Symbol
Parameter
Range
Unit
V IN CIN COUT L1 TA TJ
VIN Input Voltage Input Capacitor Output Capacitor Converter Output Inductor Ambient Temperature Junction Temperature
2.7 ~ 6
V
1~
µF
1~
µF
4.7 ~ 22
µH
-40 ~ 85
°C
-40 ~ 125
°C
Note 3: Please refer to the typical application circuit.
Electrical Characteristics
Refer to the typical application circuits. These specifications apply over. VIN=3.6V, TA=25°C.
Symbol
Parameter
Test Conditions
APW7215 Unit
Min. Typ. Max.
SUPPLY VOLTAGE AND CURRENT
VIN
Input Voltage Range
IDD1
IDD2
Input DC Bias Current
ISD UNDER-VOLTAGE LOCKOUT
VFB = 0.4V, no switching VFB = GND, switching EN = GND
2.7
-
6
V
-
-
800
µA
-
1.2
1.7 mA
-
-
1
µA
UVLO Threshold Voltage UVLO Hysteresis Voltage REFERENCE AND OUTPUT VOLTAGES
VIN Rising VIN Falling
1.9
2.2
2.4
V
50
100
200 mV
VREF Regulated Feedback Voltage
IFB
FB Input Current
INTERNAL POWER SWITCH
VIN=2.7V ~ 6V V FB=1.23V
192
200
208
mV
-1
-
1
µA
FS W
Switching Frequency
R ON Power Switch On Resistance
VIN=3.6V VIN=3V
540
600
660 kHz
-
0.3
0.7
Ω
-
-
0.7
LX Leakage Current DMAX LX Maximum Duty Cycl.