3A, 23V, 340KHz Synchronous Step

FP6193
3A, 23V, 340KHz Synchronous Step-Down Converter
General Description
The FP6193 is a synchronous buck regulator with integrated two 85mΩ power MOSFETs. It
achieves 3A continuous output current over a wide input supply range with excellent load and line
regulation. Current mode operation provides fast transient response and eases loop stabilization. The
device includes cycle-by-cycle current limiting and thermal shutdown protection. The FP6193 requires
a minimum number of readily available external components to complete a 3A buck regulator solution.
Features
 3A Output Current
 85mΩ Internal Power MOSFET Switches
 Stable with Low ESR Output Ceramic Capacitors Up to 93% Efficiency
 Programmable Soft-Start
 Fixed 340KHz Frequency
 Thermal Shutdown
 Cycle-by-Cycle Over Current Protection
 Wide 4.75V to 23V Operating Input Range
 Output Adjustable From 0.923V to 20V
 Available SOP-8L (EP) Package
 Input Under Voltage Lockout
Applications
 Distributed Power Systems
 Battery Charger Network Cards
 Pre-Regulator for Linear Regulators
 DSL Modems
Typical Application Circuit
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
1/11
FP6193
Function Block Diagram
110 / 340KHz
0.923V
Pin Descriptions
SOP-8L (EP)
Top View
Name No. I / O
BS
1
8
SS
IN
2
7
EN
SW
3
6
COMP
GND
4
5
FB
Bottom View
BS
1
Description
O
Bootstrap
IN
2
P
Supply Voltage
SW
3
O
Switch
GND
4
P
Ground
FB
5
I
Feedback
COMP
6
O
Compensation
EN
7
I
Enable / UVLO
SS
8
O
Soft-Start
EP
9
P
Exposed PAD is GND
EP
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
2/11
FP6193
Marking Information
SOP-8L (EP)
FP6193
-
Halogen Free
Lot Number
Internal ID
Per-Half Month
Year
Halogen Free: Halogen free product indicator
Lot Number: Wafer lot number’s last two digits
For Example: 132386TB  86
Internal ID: Internal Identification Code
Per-Half Month: Production period indicated in half month time unit
For Example: January → A (Front Half Month), B (Last Half Month)
February → C (Front Half Month), D (Last Half Month)
Year: Production year’s last digit
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
3/11
FP6193
Ordering Information
Part Number
Operating Temperature
Package
MOQ
Description
-40°C ~ +85°C
SOP-8L (EP)
2500EA
Tape & Reel
FP6193XR-G1
Absolute Maximum Ratings
Max.
Unit
Supply Voltage
VIN
-0.3
24
V
Supply Voltage
Vsw
-1
VIN +0.3
V
Bootstrap Voltage
VBS
Vsw -0.3
Vsw +6
V
-0.3
6
V
+150
°C
+150
℃
650
mW
+60
℃/W
+10
℃/W
Parameter
Symbol
Conditions
All Other Pins
Junction Temperature
TJ
Storage Temperature
TS
Allowable Power Dissipation
Thermal Resistance
Min.
Typ.
-65
SOP-8L (EP)
θJA
θJC
Lead Temperature (soldering, 10
sec)
SOP-8L (EP)
SOP 8L (EP)
+260
℃
IR Re-flow Soldering Curve
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
4/11
FP6193
Recommended Operating Conditions
Parameter
Symbol
Supply Voltage
Conditions
VIN
Operating Temperature
Min.
Typ.
Max.
Unit
4.75
23
V
-40
+85
℃
DC Electrical Characteristics (TA= 25℃, VIN=12V, unless otherwise noted)
Parameter
Symbol Test Conditions
Standby Current
ISB
VEN≧3V,VFB≧1.0V
Shutdown Supply Current
IST
VEN=0
Feedback Voltage
VFB
VIN=12V,VCOMP<2V
Min.
Typ.
Max.
Unit
1.0
1.5
mA
5
0.900
Feedback Over Voltage Threshold
0.923
µA
0.946
V
1.1
V
400
V/V
830
µA / V
Error Amplifier Voltage Gain
GEA
Error Amplifier Transconductance
TEA
High Side Switch ON Resistance
RON-HS
85
mΩ
Low Side Switch ON Resistance
RON-LS
85
mΩ
High Side Switch Leakage Current
IIL
High Side Current Limit
IHCL
Low Side Current Limit
COMP to Current Sense
Transconductance
Oscillation Frequency
Short Circuit Oscillation
Frequency
Maximum Duty Cycle
ILCL
Minimum On Time
Input Under Voltage Lockout
Threshold
Input Under Voltage Lockout
Threshold Hysteresis
EN Lockout Threshold
△IC=±10µA
VEN=0,VSW=0V
0.1
A
1
A
TCS
5.2
A/V
FOSC
340
KHz
VFB=0V
110
KHz
VFB=0.8V
90
%
220
ns
DMAX
From Drain to Source
TON
VUVLO
VIN Rising
3.8
4.1
4.4
200
VENLO
VEN Rising
2.2
EN Lockout Threshold Hysteresis
EN Threshold Voltage
EN Threshold Voltage
Hysteresis
µA
5.3
FSC
3.8
10
2.5
mV
2.7
250
VEN
1.0
1.5
V
V
mV
2.0
V
300
mV
Soft-Start Current
VSS=0V
6
µA
Soft start Period
CSS=0.1µF
15
ms
+150
°C
Thermal Shutdown
TTS
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
5/11
FP6193
Function Description
The FP6193 is a synchronous current-mode buck regulator. It regulates input voltages from 4.75V
to 23V down to an output voltage as low as 0.923V, and is able to supply up to 3A of load current. The
FP6193 uses current-mode control to regulate the output voltage. The output voltage is measured at FB
through a resistive voltage divider and amplified by the internal error amplifier. The output current of the
tranconductance error amplifier is presented at COMP where a network compensates the regulation
control system. The voltage at COMP is compared to the switch current measured internally to control
the output voltage. The converter uses internal n-channel MOSFET switches to step-down the input
voltage to the regulated output voltage. Since the MOSFET requires a gate voltage greater than the
input voltage, a boost capacitor connected between SW and BS drives the gate. The capacitor is
charged from the internal regulator when the SW pin is low.
Output Voltage (VOUT)
The output voltage is set using a resistive voltage divider from the output voltage to FB. The
voltage divider divides the output voltage down by the ratio:
VFB  VOUT 
R4
R2  R4
Thus the output voltage is:
VOUT  VFB 
R2  R4
R4
A typical value for R4 can be as high as 100KΩ, but a typical value is 10KΩ.
Enable Mode / Shutdown Mode
Drive the EN Pin to ground to shutdown the FP6193. Shutdown forces the internal power
MOSFETs off, turns off all internal circuitry. The EN Pin rising threshold is 1.5V (typ), and hysteresis is
300mV. For automatic startup application, pull up the EN pin with 100KΩ resister.
Boost High-Side Gate Drive (BST)
Since the MOSFET requires a gate voltage greater than the input voltage, connect a flying
bootstrap capacitor between SW and BS to provide the gate-drive voltage to the high-side n-channel
MOSFET switch. The capacitor is alternately charged from the internal regulator. On startup, an internal
low-side switch connects SW to ground and charges the BST capacitor to internal regulated voltage.
Once the BST capacitor is charged, and the internal low-side switch is turned off, the BST capacitor
voltage provides the necessary enhancement voltage to turn on the high-side switch.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
6/11
FP6193
Thermal Shutdown Protection
The FP6193 features integrated thermal shutdown protection. When the IC junction temperature
exceeds +150°C, thermal shutdown protection will be triggered. The internal power MOSFET is then
turned off to limit the device power dissipation (PD). Once thermal shutdown occurs, this device can go
back to normal operation until the junction temperature drops below +100°C approximately.
Application Information
Input Capacitor Selection
The input current to the step-down converter is discontinuous, therefore a capacitor is required to
supply the AC current to the step-down converter while maintaining the DC input voltage. Use low ESR
capacitors for the best performance. Ceramic capacitors are preferred, but tantalum or low-ESR
electrolytic capacitors may also suffice.
The input capacitor can be electrolytic, tantalum or ceramic. When using electrolytic or tantalum
capacitors, a small, high quality ceramic capacitor, i.e. 0.1μF, should be placed as close to the IC as
possible.
When using ceramic capacitors, make sure that they have enough capacitance to provide
sufficient charge to prevent excessive voltage ripple at input. The input voltage ripple caused by
capacitance can be estimated by
CIN 
IO
 D(1  D)
f  VIN
Inductor Selection
The inductor is required to supply constant current to the output load while being driven by the
switched input voltage. A larger value inductor will result in less ripple current that will result in lower
output ripple voltage. However, the larger value inductor will have a larger physical size, higher series
resistance, and / or lower saturation current. A good rule for determining the inductance to use is to
allow the peak-to-peak ripple current in the inductor to be approximately 30% of the maximum switch
current limit. Also, make sure that the peak inductor current is below the maximum switch current limit.
The inductance value can be calculated by
L
VO  VD
(1  D)
IO f
Where r is the ripple current ratio
RMS current in inductor
ILrms  IO 1 
2
12
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
7/11
FP6193
Output Capacitor Selection
The output capacitor is required to maintain the DC output voltage. Ceramic, tantalum, or low ESR
electrolytic capacitors are recommended. Low ESR capacitors are preferred to keep the output voltage
ripple low. The output voltage ripple can be estimated by:
VOUT 
VOUT  VIN  VOUT  
1
  ESR 


f  L  VIN
8
f
C OUT




In the case of ceramic capacitors, the impedance at the switching frequency is dominated by the
capacitance. The output voltage ripple is mainly caused by the capacitance. In the case of tantalum or
electrolytic capacitors, the ESR dominates the impedance at the switching frequency.
Ⅰ.In the case of ceramic capacitors
C OUT 
VOUT
2
8  f  L  VOUT

V
 1  OUT
VIN




Ⅱ.In the case of tantalum or electrolytic capacitors
ESR 
VOUT  f  L  VIN
VOUT  VIN  VOUT 
PC Board Layout Checklist
1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be
kept short, direct and wide.
2. Place CIN near IN Pin as closely as possible. To maintain input voltage steady and filter out
the pulsing input current.
3. The resistive divider R2and R4 must be connected to FB pin directly as closely as possible.
4. FB is a sensitive node. Please keep it away from switching node, SW. A good approach is to
route the feedback trace on another layer and to have a ground plane between the top layer
and the layer on which the feedback trace is routed. This reduces EMI radiation on to the
DC-DC converter’s own voltage feedback trace.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
8/11
FP6193
VIN
GROUND PLANE
GND
VIA to BS
VIA to GND
BS
FP6193
GND
VIA to
VIN
R4
VOUT
R2
VIA to GND
Suggested Layout
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
9/11
FP6193
Typical Application
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
10/11
FP6193
Package Outline
SOP-8L (EP)
UNIT: mm
Symbols
Min. (mm)
Max. (mm)
A
1.346
1.752
A1
0.050
0.152
A2
1.498
D
4.800
4.978
E
3.810
3.987
H
5.791
6.197
L
0.406
1.270
θ°
0°
8°
Exposed PAD Dimensions:
Symbols
Min. (mm)
Max. (mm)
E1
2.184 REF
D1
2.971 REF
Note:
1. Package dimensions are in compliance with JEDEC Outline: MS-012AA.
2. Dimension “D” does not include molding flash, protrusions gate burrs.
3. Dimension “E” does not include inter-lead flash, or protrusions.
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Rev. 0.64
Website: http://www.feeling-tech.com.tw
11/11
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