YB1693
2A / 150KHz Buck DC-DC Converter
Description
YB1693 Series are step-down switching
regulators with all required active functions.
It is capable of driving 2A load with
excellent line and load regulations. These
devices are available in fixed output
voltages of 3.3V, 5V and an adjustable
output version.
YB1693 series operates at a switching
frequency of 150KHz thus allowing smaller
sized filter components than what would be
needed with lower frequency switching
regulators. It substantially not only reduces
the area of board size but also the size of
heat sink, and in some cases no heat sink
is required. The ±4% tolerance on output
voltage within specified input voltages and
output load conditions is guaranteed. Also,
the oscillator frequency accuracy is within
±10%. External shutdown is included.
Featuring 70μA (typical) standby current.
The output switch includes cycle-by-cycle
current limiting, as well as thermal
shutdown for full protection under fault
conditions.
Features
Output Voltage: 3.3V, 5V & Adjustable
version
Adjustable Output Voltage Range
1.23V~19.5V ±4%
150KHz ±15% fixed switching
frequency
Voltage Mode Non-synchronous PWM
control
Thermal Shutdown and Current Limit
Protection
ON/OFF Shutdown Control Input
Soft-start (SS) Function
Short Circuit Protect (SCP)
Operating Voltage Can be up to 24V
Output Load Current 2A
Low Power Standby Mode
Applications
Simple High-efficiency Step down
Regulator
On-Card Switching Regulators
Typical Application Circuit
Figure 1: Typical Application Circuit
YB1693 MRev.1.0
www.yobon.com.tw
1
YB1693
2A / 150KHz Buck DC-DC Converter
Pin Configuration
Figure 2: YB1693 Pin Configuration
Pin Description
Table 1
NAME
VIN
SW
FB
Description
This is the positive input supply for the IC switching regulator. A suitable input
bypass capacitor must be presented at this pin to minimize voltage transients
and to supply the switching currents needed by the regulator.
Internal switch. The voltage at this pin switches between (+Vcc – Vsat) and
approximately – 0.5V, with a duty cycle of approximately Vout / Vcc. To
minimize coupling to sensitive circuitry, the PC board copper area connected
to this pin should be minimized.
Sense the regulated output voltage to complete the feedback loop.
Allows the switching regulator circuit to be shutdown using logic level signals
thus dropping the total input supply current to approximately 100uA. Pulling
this pin below a threshold voltage of approximately 1.3V turns the regulator
on, and pulling this pin above 1.3V (up to a maximum of Vcc) shuts the
regulator down. If this shutdown feature is not needed, the EN pin can be
wired to the ground pin.
Circuit ground
EN
GND
Ordering Information
Table 2
Order Number
YB1693-33
YB1693-50
YB1693-ADJ
Package Type
SOP-8
SOP-8
SOP-8
Supplied as
2500 units Tape & Reel
2500 units Tape & Reel
2500 units Tape & Reel
Package Marking
YB1693-33
YB1693-50
YB1693-ADJ
YB1693 MRev.1.0
www.yobon.com.tw
2
YB1693
2A / 150KHz Buck DC-DC Converter
Absolute Maximum Ratings
Supply Voltage............................................. +28V
Operating Voltage Range ..............+4.5V to +24V
SW, EN Pin Input Voltage ................. -0.3V to Vcc
Feedback Pin Voltage....................... -0.3V to Vcc
Power Dissipation ..................... Internally Limited
Output Voltage to Ground ............................... -1V
Storage Temperature Range ...... -65℃ to +150℃
Operating Temperature Range ... -40℃ to +125℃
Thermal Resistance
Junction to Case
θ
JA
..............................70℃ / W
Junction to Ambient
θ
JC
.........................15℃ / W
Note:
Ө
JA
is measured with the PCB copper area
(need connect to GROUND pins) of approximately
1.5 in
2
(Multi-layer)
Electricity Characteristics
Table 3
( T
A
=25°C, unless otherwise noted, V
IN
=12V for 3.3V, 5V, Adj version. I
LOAD
=0.2A )
Function Parameter
Symbol
ADJ
V
FB
η
3.3V
V
FB
η
5V
V
FB
η
I
FB
F
OSC
T
SS
I
CL
F
SCP
V
SAT
V
IL
V
IH
I
L
I
H
DC
I
Q
I
STBY
SW pin = 0
SW pin = -1
Rising edge of EN on to I
CL
Pear Current, no outside circuit
V
FB
=0V force driver on
When current limit occurred and
o
V
FB
<0.5V, Ta = 25 C
Test Conditions
4.5V≤ V
IN
≤24V
0.2A≤ I
LOAD
≤2A
V
IN
=12V, I
LOAD
=2A
4.75V≤ V
IN
≤24V
0.2A≤ I
LOAD
≤2A
V
IN
=12V, I
LOAD
=2A
7V≤ V
IN
≤24V
0.2A≤ I
LOAD
≤2A
V
IN
=12V, I
LOAD
=2A
V
FB
=1.3V (Adj version only)
Min
1.193
1.180
76
3.168
3.135
80
4.80
4.75
84
Typ
1.23
Max
1.267
1.280
3.432
3.465
5.20
5.25
-100
173
Units
V
%
Output Feedback
Efficiency
Output Feedback
Efficiency
Output Feedback
Efficiency
Feedback Bias Current
Oscillator Frequency
Soft-Start Time
Current Limit
3.3
V
%
5
V
%
-10
127
150
3
2.4
60
1.15
1.3
-0.1
nA
KHz
mS
A
KHz
Oscillator Frequency of Short Circuit
Protect
Saturation Voltage
ON/OFF Pin Logic Input Threshold
Voltage
ON/OFF Pin Logic Input Current
Maximum Duty Cycle (ON)
Maximum Duty Cycle (OFF)
Quiescent Current
Standby Quiescent Current
SW Pin Leakage
Current
I
OUT
=2A, No outside circuit
V
FB
=0V force driver on
Low (regulator ON)
High (regulator OFF)
V
LOGIC
=2.5V (OFF)
V
LOGIC
=0.5V (ON)
V
FB
=0V force driver on
V
FB
=12V force driver off
V
FB
=12V force driver off
ON/OFF pin=5V
V
IN
=24V
No outside circuit,
V
FB
=12V force driver off
V
IN
=24V
2.0
1.50
0.6
-0.5
-0.01
V
V
µA
100
0
4
45
8
100
100
-200
-5
%
mA
µA
I
SWL
µA
mA
YB1693 MRev.1.0
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YB1693
2A / 150KHz Buck DC-DC Converter
Electrical Characteristics Curve
Vout vs. Vin
Quiescent Current vs. Vin
Frequency vs. Vin
Frequency vs. Temperature
Feedback Voltage vs. Temperature
Quiescent Current vs. Temperature
YB1693 MRev.1.0
www.yobon.com.tw
4
YB1693
2A / 150KHz Buck DC-DC Converter
Threshold Voltage vs. Temperature
ON/OFF Current vs. voltage
Output Voltage vs. Temperature
Feedback Current vs. Temperature
Efficiency (Vin=12V, Vo=3.3V)
Efficiency (Vin=12V, Vo=5V)
YB1693 MRev.1.0
www.yobon.com.tw
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