YOBON YB1696 Technical data
YB1696
150KHz, 3A PWM Buck Switching Regulator
Description
The YB1696 series are monolithic
integrated circuits that provide all the active
functions for a step-down DC/DC converter,
capable of driving a 3A load without
additional transistor component. Requiring
a minimum number of external component,
the board space can be saved easily. The
external shutdown function can be
controlled by TTL logic level and then come
into standby mode. The internal
compensation makes feedback control
have good line and load regulation without
external design. Regarding protected
function, thermal shutdown is to prevent
over temperature operating from damage,
and current limit is against over current
operating of the output switch. The YB1696
series operates at a switching frequency of
150KHz thus allowing smaller sized filter
components than what would be needed
with lower frequency switching regulators.
Other features include a guaranteed +4%
tolerance on output voltage under specified
input voltage and output load conditions,
and +15% on the oscillator frequency. The
output version included fixed 5V and an
adjustable type. The package is available in
a standard 5-lead TO-263(S).
Typical Application Circuit
Features
5V and adjustable output versions
Adjustable version output voltage
range, 1.23V to 28V +4% max over
line and load condition
Available in TO263-5L packages
Voltage mode non-synchronous PWM
control
Thermal-shutdown and current-limit
protection
ON/OFF shutdown control input
Input voltage range up to 32V
Output load current: 3A
150 KHz fixed frequency internal
oscillator
Low power standby mode
Built-in switching transistor on chip
Applications
Simple High-efficiency step-down
regulator
Efficient preregulator for linear
regulators
On-card switching regulators
Positive to negative converter
Battery charger
YB1696 MRev.1.1 www.yobon.com.tw 1
YB1696
150KHz, 3A PWM Buck Switching Regulator
Pin Configuration
Pin Description
Tab le 1
Pin Name Pin Function
VIN
OUTPUT
GND
FB
SD
Operating voltage input
Switching output
Ground
Output voltage feedback control
ON/OFF Shutdown
YB1696 MRev.1.1 www.yobon.com.tw 2
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
YB1696-ADJ : For External Adjustable Version
Absolute Maximum Ratings
Symbol Parameter Rating Unit
VCC Supply Voltage +34 V
VSD ON/OFF Pin input voltage -0.3 to +25 V
VFB Feedback Pin voltage -0.3 to +25 V
V
Output voltage to Ground -1 V
OUT
PD Power dissipation Internally limited W
TST Storage temperature -65 to +150
TOP Operating temperature -40 to +125
VOP Operating voltage +4.5 to +25 V
o
C
o
C
YB1696 MRev.1.1 www.yobon.com.tw 3
YB1696
A
150KHz, 3A PWM Buck Switching Regulator
Electrical Characteristics
Unless otherwise specified, VIN=12V for 3.3V, 5V, adjustable version. I
Symbol Parameter Conditions Min. Typ. Max. Unit
IB
F
OSC
Feedback bias
current
oscillator frequency
V
saturation voltage
SAT
DC
Max. Duty Cycle(ON) VFB=0V force driver on 100
Min. Duty cycle(OFF)
ICL current limit
IL
IQ Quiescent Current VFB=12 force driver off 5 10 mA
I
STBY
Output = 0
Output = 1
Standby Quiescent
Current
Output
leakage
current
VFB=1.3V
(Adjustable version
only)
I
=3A
OUT
no outside circuit
VFB=0V force driver on
VFB=12V force driver
off
peak current
no outside circuit
VFB=0 force driver on
no outside circuit
VFB=12 force driver off
VIN=32V 2 60 mA
ON/OFF pin=5V
VIN=24V
LOAD
=0.3
40
127 150 173
110 173
1.3
60
100
1.4
1.5
nA
Khz
V
0
5.5
3.6 4.5
6.5
%
A
200 uA
150
250
uA
300
VIL Low (regulator ON) - 0.6
VIH
ON/OFF pin logic input
threshold voltage
High (regulator OFF) 2.0
1.3
V
-
IH
IL
ΘJC
ΘJA
ON/OFF pin logic
input current
ON/OFF pin input current
Thermal Resistance
Thermal Resistance
With copper area of
approximately 3 in
2
V
V
=2.5V (OFF) 15 25
LOGIC
=0.5V (ON) 0.02 5
LOGIC
Junction to case 3.5
Junction to ambient 23
uA
o
C/W
o
C/W
YB1696 MRev.1.1 www.yobon.com.tw 4
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