Single Switching Controller 5.5V Input Voltage Range Adjustable F
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APW7078
Single Switching Controller
5.5V Input Voltage Range Adjustable Frequency: Maximum 1MHZ Incorporates Soft-start Function Built-in Short-circuit Detection Circuit (SCP) Operating Current: Maximum Shutdown Current: Maximum Package: MSOP-8, TSSOP-8 Under Voltage Lockout Lead Free Available (RoHS Compliant)
General Description
7078 single tep-up DC-DC roller operating volt applic oft-st short circ detect function. oscillator switching frequency chip operated terminating connect apac itor resis adjus able operating frequency. Soft-start adjusted with external capacitor, whic input current ramp. ides, external compensation will apply flexibility dynamic loop status, which allow using small, equivalent series istance eramic output capacitors.
Applications
Display Power Source Camcorders VCRs, Digital Still Camera Hand-held Communication Instruments PDAs
Pinouts
Ordering Marking Information
APW7078
Lead Free Code Handling Code Temp. Range Package Code APW7078 APW7078 APW7078 APW7078 XXXXX
APW7078
Package Code MSOP TSSOP-8 Temp. Range Handling Code Tube Tape Reel Lead Free Code Lead Free Device Blank Original Device XXXXX Date Code
XXXXX Date Code
ANPEC d-free produ comp ds/die attach matte rmin atio nish full compl iant with compa tibl both SnPb ad-free sold ieri ad-free produ exceed -free uireme /JEDEC classi ficati d-fre temp ture.
ANPEC reserves right make changes improve reliability manufacturability without notice, advise customers obtain latest version relevant information verify before placing orders. opyright ANPEC Electronics orp. Rev. Nov., 2005 www.anpec.com.tw
APW7078
Block Diagram
UVLO
0.16V Sawtooth wave oscillator
Error Amp.
0.8V
Comp.
Output drive circuit
Vref 0.5V
Soft start
Absolute Maximum Ratings
Symbol Supply Voltage Input Output Pins Operating Ambient Temperature Range Junction Temperature Range Storage Temperature Range Soldering Temperature Parameter Value -0.3 -0.3 +150 300, seconds Unit
Recommended Operating Condition
Symbol VINV VCTL Supply Voltage Error Amplifier Invert Input Voltage Control Input Voltage Capacitor Timing Resistance Timing Capacitor Oscillator Frequency
Parameter
Value Min. -0.2 -0.2 Typ. Max. 1000
Unit
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APW7078
Electrical Characteristics
Symbol Entire Device Dmax Supply Voltage Supply Current Shutdown Current Maximum Duty Cycle Startup Threshold Voltage Hysteresis voltage Voltage Soft-Start completion Soft-Start Charge Current Vscp=0V VDD=2.3V 5.5V open Rt=3.3K, Ct=270pF Parameter
25°C, 3.3V, unless otherwise specified)
Test Conditions
APW7078
Unit
Under Voltage Lockout Protection
Soft-Start -0.7 -1.0 -1.5
Short Circuit Protection(SCP) Vscp Iscp Fosc Threshold Voltage Charge Current Oscillator Frequency Frequency Stability Voltage Vscp=0V -0.7 -1.0 -1.5
Sawtooth waveform oscillator(OSC) Rt=3.3K, Ct=270pF VDD=2.3V 5.5V Ta=-40°C 85°C
Frequency Stability Temperature Error Amplifier Vref Reference Voltage
VFB=INV VDD=2.3V 5.5V Ta=-40°C 85°C
0.49
0.51
Vref/dV Vref stability Vref variation with Vref/dT Temperature Transconductance Input Bias Current Output Voltage Range Output Source Current Output Sink Current
1000 INV=0V INV=0V,FB=0.5V INV=1V,FB=0.5V -150
1300
1600
µA/V
0.01 -180 -210
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APW7078
Electrical Characteristics (Cont.)
25°C, 3.3V, unless otherwise specified)
Symbol
Parameter
Test Conditions
APW7078 -150 -200 0.2V 0.8VDD
Unit
Controller Driver ISOURCE Output Source Current ISINK Output Sink Current Control Block Control Voltage Active mode Switch-off mode Duty<5%, OUT=0V Duty>5%, OUT=5V
Function Description
Symbol Description Internal 0.5V reference voltage. resistor divider output voltage. Soft-start short-circuit detection, connects capacitor from ground. Power supply input voltage. Output control pin. operating mode; High shutdown mode. External MOSFET driving pin. Ground pins Setting capacitor resister provide oscillation switching frequency adjustment. Error amplifier output pin. Setting circuit compensation.
Application Schematic
2.5V~4.2V 10uH 22uF 0.1uF 390K 2N7002 820K 270pF 3.3K 0.1uF VOUT 300mA
SS12
APM2300A 47uF 0.1uF
*R2100K recommended
33pF
Fig1: APW7078 Step-up Application Adjust Voltage
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APW7078
Application Schematic
2.5V~5.5V 10uH 22uF 0.1uF 390K 270pF VOUT
SS12
100mA
APM2300A 33uF 0.1uF
9.1K 2N7002 150K 68pF
4.3K
0.1uF
Fig2: APW7078 Step-up Application Adjust Voltage
0.1uF
2.5V~5.5V 22uH 22uF
0.1uF
3.3uF
SS12
APM2300A 100uF 0.1uF
0.1uF
390K
1.2M
270pF
3.3K
0.1uF
2N7002
*R2100K recommended
Fig3. APW7078 Multiple-output Panel Power
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APW7078
Timing Diagram
input voltage Short cirucit detect comparator Sawtooth wave output Soft-start setting voltage
Output waveform
detect voltage waveform Soft start Power supply control Output short circuit tscp Output short circuit
Output short circuit detection
Typical Characteristics
25°C, 3.3V, unless otherwise specified)
Supply Current Supply Voltage
SHDN Release
Supply Current(µA)
=25° RT=3.3k CT=270pF
Maximum Duty(%) Supply Voltage(V)
CH1=VOUT 2V/DIV TIME=20ms/DIV CH2=VCTL 2V/DIV CH3=Vss 0.5V/DIV CH4=IL 1A/DIV www.anpec.com.tw
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APW7078
Typical Characteristics (Cont.)
25°C, 3.3V, unless otherwise specified)
Reference Voltage Supply Voltage
0.54 0.53
Reference Voltage Temperature
Reference Voltage(mV)
Reference Voltage(V)
0.52 0.51
=25°
VDD=3.3V
0.50 0.49 0.48 0.47 0.46
Supply Voltage(V)
Temperature(°
Oscillator Frequency Timing Resistor
1000
Maximum Duty Oscillator Frequency
Oscillator Frequency(kHz)
CT=270pF
CT=100pF
Maximum Duty(%)
CT=200pF
CT=100pF
CT=270pF
1000
Timing Resistor(k)
Oscillator Frequency(kHz)
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APW7078
Typical Characteristics (Cont.)
25°C, 3.3V, unless otherwise specified)
Power under light load
Power under heavy load
IOUT= 5mA, TIME=40ms/DIV CH1=OUT 5VDIV CH2=VOUT=VDD 2V/DIV CH3=IL 0.5A/DIV CH4=Vss 1V/DIV
IIOUT= 400mA, TIME=40ms/DIV CH1=OUT 5VDIV CH2=VOUT=VDD 2V/DIV CH3=IL 0.5A/DIV CH4=Vss 1V/DIV
Efficiency
Efficiency
VDD=2.5V
VDD=3.3V
Efficiency(%)
VDD=3.3V
Efficiency(%)
1000
VDD=5V
VDD=3.6V
VOUT=9V L=10µH CT=270pF RT=4.3K
VOUT=5V L=10µH CT=270pF RT=3.3K
Output Current(mA)
Output Current(mA)
opyright ANPEC Electronics orp. Rev. Nov., 2005
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APW7078
Typical Characteristics
25°C, 3.3V, unless otherwise specified)
Frequency Variation Ratio Supply Voltage Frequency Variation Ration f/f(%)
Frequency Variation Ratio Temperature Frequency Variation Ration f/f(%)
=25° RT=3.3k CT=270pF
CT=270pF RT=3.3k
Supply Voltage(V)
Temperature(°
Function Description
Setting Oscillating Frequency oscillator circuit generat triangular sawt ooth wave with peak 0.9V through 0.16V using timing capacitor(Ct) timing resistor(Rt) that connected pin. This oscillator provide oscillating frequency 1MHz.
0.9V 0.16V
ln(VH 1.72 (370 1.72Rt
0.9V
Vosc
Setting Output Voltage voltage using
V(t)
0.16V
sistor divider connected output shown typical operating circuit. internal reference voltage 0.5V with variation, ratio feedbac istors output voltage according following equation:
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Time
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APW7078
Function Description (Cont.)
Setting Output Voltage (Cont.) (pin stays low. Once protection circuit operates, circuit restored resetting power supply. Short circuit detection time calculate follow:
VOUT
avoid thermal nois from feedback resistor, Resistance smaller than 100k variation recommended. Error amplifier error amplifier detects output voltage swit ching regulat control signal. voltage gain fixed, connec ting phase compensation resistor capacitor (pin provides stable phase compensation system. comparator volt omparator invert three non-inverting inputs. comparator voltage/pulse width converter that controls time output pulse depending input voltage. output level high when sawtooth wave lower than error amplifier output voltage, soft start setting voltage, idle period setting voltage. Output circuit output circuit typical push-pull configuration drive external NMOS transistor directly. provide 200mA source/sink to/from OUT(pin Soft start short circuit detection Soft start operation connecting capacitor Cscp (pin Soft tart prevents current spike start-up.On completion soft start operation, (pin tays enters short circuit detection wait stat e.When output short circuit occurs, error amplifier output fixed 1.8V capacitor Cscp starts charging. After charging approximately output
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Cscp(µ
Under Voltage Lock Out(UVLO) Trans ient during powering inst aneous glitches supply voltage cause system damage failure. circuit prevent malfunction input voltage detect input voltage comparing supply voltage internal reference voltage. detection, circuit fixes output low. system recovers when supply voltage rises back above hreshold volt malfunc tion prevention circuit. Layout Considerations Switching Noise Decoupling Capacitor 0.1µF ceramic capacitor should placed close chip filter switc hing spikes output voltage monitored VOUT pin. Feedback Network PW7078 applicat ion, feedback networks should connec directly dedicated analog ground plane this ground plane must connect pin. analog ground plane available then this ground must directly pin. feedback network, resistors should kept close pin, away from inductor, minimize copper trace connections that inject noise into system. Input Capacitor input capacitor must placed close This will reduce copper trace resistance which
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APW7078
Function Description(Cont.)
Input Capacitor (Cont.) effects input voltage ripple additional input voltage filtering, capac itor placed parallel with close pin, shunt high frequency noise ground. Demo Board Circuit Layout Layer
Bottom Layer
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APW7078
Packaging Information
MSOP-8
Millimeters Min. 0.06 0.86 0.25 0.65 2.90 2.90 0.25 0.0375 0.114 0.189 0.169 0.01 Max. 0.15 Min. 0.002
Inches Max. 0.006 0.34 0.0126 0.0256TYP 0.124 0.197 0.177 0.039REF 0.953
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APW7078
Packaging Information
TSSOP-8
GAUGE PLANE
0.25
(L1)
Millimeters Min. 0.00 0.80 0.19 0.65 6.40 4.30 0.45 0.09 0.09 0.004 0.004 0.008 4.50 0.75 0.169 0.018 Max. 0.15 1.05 0.30 Min. 0.000 0.031 0.007 0.114
Inches Max. 0.047 0.006 0.041 0.012 0.122 0.026 0.252 0.177 0.030 0.039REF
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APW7078
Physical Specifications
Terminal Material Lead Solderability Solder-Plated Copper (Solder Material 90/10 63/37 SnPb) Meets Specification RSI86-91, ANSI/J-STD-002 Category
(IR/Convection Reflow)
Reflow Condition
Critical Zone
Ramp-up
Temperature
Tsmax
Tsmin Ramp-down Preheat
Peak
Time
Classification Reflow Profiles
Profile Feature Sn-Pb Eutectic Assembly Pb-Free Assembly Average ramp-up rate 3°C/second max. 3°C/second max. Preheat 100°C 150°C Temperature (Tsmin) 150°C 200°C Temperature (Tsmax) 60-120 seconds 60-180 seconds Time (min max) (ts) Time maintained above: 183°C 217°C Temperature (TL) 60-150 seconds 60-150 seconds Time Peak/Classificatioon Temperature (Tp) table table Time within actual 10-30 seconds 20-40 seconds Peak Temperature (tp) Ramp-down Rate 6°C/second max. 6°C/second max. minutes max. minutes max. Time Peak Temperature Notes: temperatures refer topside package .Measured body surface.
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APW7078
Classification Reflow Profiles(Cont.)
Table SnPb Entectic Process Package Peak Reflow Temperatures Package Thickness Volume Volume <350 <2.5 +0/-5 +0/- +0/-5 +0/-
Table Pb-free Process Package Classification Reflow Temperatures Package Thickness Volume Volume Volume <350 -2000 >2000 <1.6 *Tolerance: device manufacturer/supplier shall assure process compatibility including stated classification temperature (this means Peak reflow temperature example rated level.
Reliability Test Program
Test item SOLDERABILITY HOLT Method MIL-STD-883D-2003 MIL-STD 883D-1005.7 JESD-22-B, A102 MIL-STD 883D-1011.9 Description 245°C,5 1000 Bias 125°C Hrs, 100% 121°C -65°C 150°C, Cycles
Carrier Tape Reel Dimensions
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APW7078
Carrier Tape Reel Dimensions(Cont.)
Application
+1.5
12.75+ 0.15
12.4 12.4
1.75
1.55 +0.1 1.55+ 0.25 +1.5 12.75+ 0.15
±0.013 1.75
Application
TSSOP-8
±0.013
(mm)
Cover Tape Dimensions
Application MSOP- TSSOP- Carrier Width Cover Tape Width Devices Reel 2500 2500
Customer Service
Anpec Electronics Corp. Head Office No.6, Dusing Road, SBIP, Hsin-Chu, Taiwan, R.O.C. 886-3-5642000 886-3-5642050 Taipei Branch 137, Lane 235, Chiao Rd., Hsin Tien City, Taipei Hsien, Taiwan, 886-2-89191368 886-2-89191369
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