YB1696
150KHz, 3A PWM Buck Switching Regulator
Description
Features
The YB1696 series are monolithic 5V and adjustable output versions integrated circuits that provide all the active Adjustable version output voltage functions for a step-down DC/DC converter, range, 1.23V to 28V +4% max over
line and load condition capable of driving a 3A load without
additional transistor component. Requiring Available in TO263-5L packages
a minimum number of external component, Voltage mode non-synchronous PWM
control the board space can be saved easily. The
external shutdown function can be Thermal-shutdown and current-limit
protection controlled by TTL logic level and then come
into standby mode. The internal ON/OFF shutdown control input compensation makes feedback control Input voltage range up to 32V have good line and load regulation without Output load current: 3A
external design. Regarding protected 150 KHz fixed frequency internal
oscillator function, thermal shutdown is to prevent
over temperature operating from damage, Low power standby mode
and current limit is against over current Built-in switching transistor on chip operating of the output switch. The YB1696 series operates at a switching frequency of
150KHz thus allowing smaller sized filter Applications components than what would be needed
with lower frequency switching regulators. Simple High-efficiency step-down
regulator
Other features include a guaranteed +4% Efficient preregulator for linear
tolerance on output voltage under specified
regulators
input voltage and output load conditions,
and +15% on the oscillator frequency. The On-card switching regulators output version included fixed 5V and an Positive to negative converter
Battery charger
adjustable type. The package is available in
a standard 5-lead TO-263(S).
Typical Application Circuit
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YB1696
150KHz, 3A PWM Buck Switching Regulator
Pin Configuration
Pin Function
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
Pin Description
Table 1
Pin Name VIN OUTPUT GND FB SD
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YB1696
150KHz, 3A PWM Buck Switching Regulator
Ordering Information
YB1696-50 : For Fixed Output Voltage of 5.0V YB1696-ADJ : For External Adjustable Version
Marking Information
YB1696-50 : For Fixed Output Voltage of 5.0V
For External Adjustable Version YB1696-ADJ :
Absolute Maximum Ratings Symbol Parameter VCC Supply Voltage
VSD ON/OFF Pin input voltage VFB Feedback Pin voltage VOUT Output voltage to Ground PD Power dissipation TST Storage temperature TOP Operating temperature VOP Operating voltage
Rating
+34 -0.3 to +25 -0.3 to +25
-1 -65 to +150 -40 to +125 +4.5 to +25
Unit
V V V V W
oo
Internally limited
C C
V
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YB1696
150KHz, 3A PWM Buck Switching Regulator
Electrical Characteristics
Unless otherwise specified,VIN=12V for 3.3V, 5V, adjustable version. ILOAD=0.3A Symbol Parameter Conditions Min. Typ. Max. Unit
VFB=1.3V 60
Feedback bias IB 40 nA (Adjustable version current 100
only)
127 150 173 FOSC oscillator frequency Khz 110 173 IOUT=3A 1.4
V saturation voltage no outside circuit 1.3 V SAT 1.5 VFB=0V force driver on
Max. Duty Cycle(ON) V=0V force driver on 100 FB
% DC 12V force driver VFB 0 Min. Duty cycle(OFF)
off = peak current 5.5 ICL current limit 3.6 4.5 A no outside circuit
6.5 VFB=0 force driver on Output no outside circuit
Output = 0 200 uA
IL leakage VFB=12 force driver off Output = 1 current VIN32V 2 60 mA IQ Quiescent Current VFB=12 force driver off 5 10 mA 250 Standby Quiescent ON/OFF pin=5V ISTBY 150 uA
Current VIN=24V 300
VIL Low (regulator ON) - 0.6
ON/OFF pin logic input
1.3 V threshold voltage
VIH High (regulator OFF) 2.0 -
IH IL
ΘJC ΘJA
VLOGIC=2.5V (OFF)
ON/OFF pin input current VLOGIC=0.5V (ON)
Thermal Resistance Junction to case Thermal Resistance
With copper area of Junction to ambient 2ON/OFF pin logic input current
approximately 3 in
15 0.02 3.5 23
25 5
o
uA C/WC/W
o
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YB1696
150KHz, 3A PWM Buck Switching Regulator
YB1696_ADJ YB1696_50
Symbol VFB Parameter Output Feedback Conditions 5V < VIN < 32V 0.2A < ILOAD < 3A VOUT programmed for 3V Typ.1.23Limit 1.193/1.18 1.267/1.28 Unit V VMIN VMAX % V VMIN VMAX % η VOUT η Efficiency VIN = 12V, ILOAD3A 73 Output voltage8V < VIN < 32V 0.2A < ILOAD < 3A 5 4.8/4.75 5.2/5.25 Efficiency VIN = 12V, ILOAD3A 80
=
=
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YB1696
150KHz, 3A PWM Buck Switching Regulator
Typical Characteristics
Typical Performance Characteristics
Normalized Output Voltage
5.10
OUTPUT VOLTAGE CHANGEVIN=20V, ILOAD=3ANormalized at TJ=25oCEfficiency
100
EFFICIENCY (%)5.05
9590858075
3A Load5.00
5V4.95
3.3V4.90
-50
-25
0
25
50
75
100
125
70
8
10
15
20
25
303540
JUNCTION TEMPERATURE(oC)
JUNCTION TEMPERATURE(oC)
Switch Saturation Voltage
1.7
SATURATION VOLTAGE (V)Switch Current Limit
6.0
SWITCH CURRENT LIMIT (A)1.61.51.4
1 : -40oC2 : 25oC3 : 125oCVIN=12V, VOUT=5V5.5
5.0
11.31.2
32.0
3
4
5
24.5
4.0
-50
-25
0
25
50
75
100125
o
SWITCH CURRENT(A)JUNCTION TEMPERATURE(C)
Operating Quiescent Current
25.0
SUPPLY CURRENT (mA)Shutdown Quiescent Current
200.0160.0
CURRENT (uA)20.015.010.05.00.0
-50
-25
0
25
50
75
100
125
Switch ONSwitch OFF120.080.040.00.0
123VON/OFF=5V1 : -40oC2 : 25oC3 : 125oC20
30
40
10
JUNCTION TEMPERATURE(oC)SUPPLY VOLOTAGE (V)
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YB1696
150KHz, 3A PWM Buck Switching Regulator
Minimum Operating Supply Voltage5.0THRESHOLD VOLTAGE (V)ON/OFF Threshold Voltage5.04.03.02.01.00.0SUPPLY VOLTAGE (V)4.03.02.01.00.0-50-250255075100125VOUT=1.23VILOAD=120mA-50-250255075100125JUNCTION TEMPERATURE (oC)JUNCTION TEMPERATURE (oC)ON/OFF Pin Current (Sinking)150.0FREQUENCY (kHz)Switch Frequency200.0120.0CURRENT (uA)VIN=40V-40oC T 125oC≤J≤150.090.060.030.00.01.4510152022232425ON/OFF PIN VOLTAGE (V)100.050.00.0-50-250255075100125JUNCTION TEMPERATURE (oC)Feedback Pin Bias Current50.0BIAS CURRENT (nA)40.030.020.0Adjustable Version Only10.00.0-50-250255075100125JUNCTION TEMPERATURE(oC)
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YB1696
150KHz, 3A PWM Buck Switching Regulator
Functional Block Diagram
SD
VIN
200mVCurrentSourcebias1.235VReference2.5VRegulatorStartup220mV+Comp_Comp++FB
_Comp+
Typical Application Circuit
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_AmpPre-driver150kHzOSC.ThermalLimit_3ASwitchOutputGnd
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YB1696
150KHz, 3A PWM Buck Switching Regulator
Function Description
Pin Functions +VIN
This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator.
open, in either case the regulator will be in the ON condition.
Thermal Considerations
The YB1696 is available in a 5-pin surface mount TO-263.
The TO-263 surface mount package tab is
designed to be soldered to the copper on a Ground
printed circuit board. The copper and the Circuit ground.
board are the heat sink for this package
and the other heat producing components, Output
Internal switch. The voltage at this pin such as the catch diode and inductor. The switches between (+VIN – VSAT) and PC board copper area that the package is approximately – 0.5V, with a duty cycle of soldered to should be at least 0.8 in2, and approximately VOUT / VIN. To minimize ideally should have 2 or more square coupling to sensitive circuitry, the PC board inches of 2 oz. Additional copper area copper area connected to this pin should improves the thermal characteristics, but be kept a minimum. with copper areas greater than
approximately 6 in2, only small
improvements in heat dissipation are Feedback
Senses the regulated output voltage to realized. If further thermal improvements complete the feedback loop. are needed, double sided, multilayer PC
board with large copper areas and/or
airflow are recommended. ON/OFF
Allows the switching regulator circuit to be
shutdown using logic level signals thus The YB1696 (TO-263 package) junction dropping the total input supply current to temperature rise above ambient approximately 150uA. Pulling this pin below temperature with a 2A load for various input a threshold voltage of approximately 1.3V and output voltages. This data was taken turns the regulator on, and pulling this pin with the circuit operating as a buck above 1.3V (up to a maximum of 25V) switching regulator with all components shuts the regulator down. If this shutdown mounted on a PC board to simulate the feature is not needed, the ON/OFF pin can junction temperature under actual be wired to the ground pin or it can be left operating conditions. This curve can be
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YB1696
150KHz, 3A PWM Buck Switching Regulator
used for a quick check for the approximate junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. When load currents higher than 3A are used, double sided or multilayer PC boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages.
For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (Once exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further.
Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multilayer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or
moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board.
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YB1696
150KHz, 3A PWM Buck Switching Regulator
Package Information
TO263-5L
EFAL2C2DLeBCL1
Symbol
Dimensions In Millimeters Min.
Max.
Dimensions In Inches Min.
Max.
A 4.38 4.78 0.172 0.188 B 0.72 0.92 0.028 0.036 C 0.36 0.41 0.014 0.016 C2 1.18 1.38 0.046 0.055 D 8.23 8.63 0.324 0.340 E 9.96 10.36 0.392 0.407 e 1.60 1.80 0.062 0.071 F 6.80 7.20 0.267 0.283 L 15.14 15.74 0.596 0.620 L1 2.28 2.79 0.089 0.110 L2 1.40 1.80 0.055 0.071
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