RY3825
18V 2A 600KHz Synchronous Step-Down Regulator
Features
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•
•
Wide 4V to 18V Operating Input Range
2A Continuous Output Current
600kHz Switching Frequency
Short Protection with Hiccup-Mode
Built-in Over Current Limit
Built-in Over Voltage Protection
Internal Power-Save Mode (PFM/PWM)
Internal Soft-Start
•
•
•
•
•
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110mΩ/70mΩ Low RDS(ON) Internal Power
MOSFETs
Output Adjustable from 0.768V
No Schottky Diode Required
Integrated internal compensation
Thermal Shutdown
Available in SOT23-6 Package
-40°C to +85°C Temperature Range
Applications
•
•
•
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Digital Set-top Box (STB)
Tablet Personal Computer (Pad)
Flat-Panel Television and Monitor
Wi-Fi Router / AP
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Digital Video Recorder (DVR)
Portable Media Player (PMP)
Cable Modem / XDSL
General Purposes
General Description
The RY3825 is a high frequency, synchronous, rectified, step-down, switch-mode converter with internal power
MOSFETs. It offers a very compact solution to achieve a 3A peak output current over a wide input supply range,
with excellent load and line regulation.
The RY3825 requires a minimal number of readily available, external components and is available in a space saving
SOT23-6 package.
Typical Application
Circuit
C
1
V
IN
BS
IN
SW
L
1
C
FF
Opt.
V
OUT
R
1
C
IN
ON/
OFF
EN
GND
FB
R
2
C
OUT
Basic Application Circuit
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RY3825
18V 2A 600KHz Synchronous Step-Down Regulator
Pin Description
Pin Configuration
TOP VIEW
GND
1
6
BS
SW
2
5
EN
IN
3
4
FB
SOT23-6
Top Marking: BLYLL (device code: BL, Y=year code, LL= lot number code)
Pin Description
Pin
1
2
3
4
5
6
Name
GND
SW
IN
FB
EN
BS
GROUND Pin
Switching Pin
Power Supply Pin
Adjustable Version Feedback input. Connect FB to the center point of the external
resistor divider
Drive this pin to a logic-high to enable the IC. Drive to a logic-low to disable the IC
and enter micro-power shutdown mode.
Bootstrap. A capacitor connected between SW and BS pins is required to form a
floating supply across the high-side switch driver.
Function
Order Information
Marking
BLYLL
Part No.
70301029
Model
RY3825
Description
RY3825 Buck, 4-18V, 2A, 600KHz, VFB
0.768V, SOT23-6
Package
SOT23-6
T/R Qty
3000PCS
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RY3825
18V 2A 600KHz Synchronous Step-Down Regulator
Absolute Maximum Ratings
V
IN
, EN, Voltage …………………... -0.3V to 21V V
SW
Voltage ...………………...…...…. -0.3V to (V
IN
+0.5V)
V
FB
Voltages ...………………………… -0.3 to 6V V
BS
Voltage …...………………...... (Vsw-0.3) to (Vsw+5V)
Operating Temperature Range …...-40°C to +85°C Storage Temperature Range ………………. -65°C to 150°C
Lead Temperature (Soldering, 10s) ……... +300°C Junction Temperature……….………………...….…+150°C
θ
JA
……….……...……….…………........170°C/W ESD (Human Body Made) HMB……………...……….2KV
θ
JC
……….……...……………...……......110°C/W ESD (Machine Made) MM…………………………... 200V
Note1: Exceeding these ratings may damage the device.
Note2: The device is not guaranteed to function outside of its operating conditions.
Electrical Characteristics
Parameter
Input Voltage Range
Supply Current in Operation
Supply Current in Shutdown
Regulated Feedback Voltage
High-Side Switch On-Resistance
Low-Side Switch On-Resistance
High-Side Switch Leakage Current
Upper Switch Current Limit
Oscillation Frequency
Maximum Duty Cycle
Minimum On-Time
Minimum Off-Time
EN Input Current
VIN Under-Voltage Lockout
Threshold
VIN Under-Voltage Lockout
Threshold-Hysteresis
EN up Threshold
EN Threshold Hysteresis
Soft Start
Hiccup Frequency
Hiccup Duty cycle
Thermal Shutdown
Thermal Hysteresis
V
OUT
= 3.3V, V
IN
= 12V
V
OUT
= 3.3V, V
IN
= 12V
1
80
40
160
20
V
EN
=2V
V
EN
=0V
INUV
TH
INUV
HYS
V
EN
-Rising
1.05
3.5
200
1.15
140
2
120
1.25
V
FB
=0.768V
V
EN
=0V, V
SW
=0V
Minimum Duty Cycle
3
600
92
60
90
1
0
3.8
V
EN
=3.0V, V
FB
=1.1V
V
EN
=0 or EN = GND
T
J
=
-
40°C to +125°C
0.749
0.768
110
70
10
Test Conditions
Min
4
0.4
Typ.
Max
18
0.8
10
0.787
Unit
V
mA
uA
V
mΩ
mΩ
uA
A
KHz
%
nS
nS
uA
uA
V
mV
V
mV
mS
Hz
%
℃
℃
Note3: MOSFET on-resistance specifications are guaranteed by correlation to wafer level measurements.
Note4: Thermal shutdown specifications are guaranteed by correlation to the design and characteristics analysis.
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RY3825
18V 2A 600KHz Synchronous Step-Down Regulator
Typical Performance Characteristics
Note (1): Performance waveforms are tested on the evaluation board.
Note (2): V
IN
=12V, V
OUT
=3.3V, T
A
= +25ºC, unless otherwise noted.
Efficiency vs Load Current
V
OUT
= 3.3V
Load Regulation
V
OUT
= 3.3V
Line Regulation
V
OUT
= 3.3V
Output Ripple Voltage
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A
Output Ripple Voltage
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 1.0A
Output Ripple Voltage
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 2.0A
Loop Response
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 1.0A-2.0A
Hiccup with Output Short
V
IN
= 12V, V
OUT
= 3.3V
Short Circuit Entry
V
IN
= 12V, V
OUT
= 3.3V
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RY3825
18V 2A 600KHz Synchronous Step-Down Regulator
Short Circuit Recovery
V
IN
= 12V, V
OUT
= 3.3V
Enable Startup at No Load
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A
Enable Shutdown at No Load
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A
Enable Startup at Full Load
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 2.0A
Enable Shutdown at Full Load
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 2.0A
Power Up at No Load
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A
Power Up at Full Load
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 2.0A
Email: support@rychip.com
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http://www.rychip.com
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