RY8310
30V 1.2A 1.4MHz PWM SYN Step-Down Regulator
Features
•
•
•
•
•
•
•
•
Wide 4V to 30V Operating Input Range
1.2A Continuous Output Current
1.4MHz Switching Frequency
Short Protection with Hiccup-Mode
Built-in Over Current Limit
Built-in Over Voltage Protection
Force-PWM Mode
Internal Soft-Start
•
•
•
•
•
•
•
200mΩ/150mΩ Low RDS(ON) Internal Power
MOSFETs
Output Adjustable from 0.8V
No Schottky Diode Required
Integrated internal compensation
Thermal Shutdown
Available in SOT23-6 Package
-40°C to +85°C Temperature Range
Applications
•
•
CCTV Camera
Flat-Panel Television and Monitor
•
•
Battery Charger
Distributed Power Systems
General Description
The RY8310 is a high frequency, synchronous, rectified, step-down, switch-mode converter with internal power
MOSFETs. It offers a very compact solution to achieve a 1.5A peak output current over a wide input supply range,
with excellent load and line regulation.
The RY8310 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
V
OUT
R
1
C
IN
ON/
OFF
C
FF
C
OUT
EN
GND
FB
R
2
Basic Application Circuit
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RY8310
30V 1.2A 1.4MHz PWM SYN Step-Down Regulator
Pin Description
Pin Configuration
TOP VIEW
BS
1
6
SW
GND
2
5
IN
FB
3
4
EN
SOT23-6
Top Marking: GBYLL (device code: GB, Y=year code, LL= lot number code)
Pin Description
Pin
1
2
3
4
5
6
Name
BS
GND
FB
EN
IN
SW
Function
Bootstrap. A capacitor connected between SW and BS pins is required to form a
floating supply across the high-side switch driver.
GROUND 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.
Power Supply Pin
Switching Pin
Order Information
Marking
GBYLL
Part No.
70301500
Model
RY8310
Description
RY8310 PWM Buck, 4-30V,
1.4MHz, VFB 0.8V, SOT23-6
1.2A,
Package
SOT23-6
MOQ
3000PCS
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RY8310
30V 1.2A 1.4MHz PWM SYN Step-Down Regulator
Absolute Maximum Ratings
(1) (2)
V
IN
, EN, Voltage …………………... -0.3V to 36V 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° Junction Temperature……….………………...….…+125°C
C
ESD (Human Body Made) HMB…………….2KV 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.
Thermal Resistance
SOT236 θ
JA
……….…..……….……......105°C/W
SOT236 θ
JC
……….……...……………...……........35°C/W
Electrical Characteristics
(3) (4)
(V
IN
=12V, V
OUT
=5V, T
A
= 25°C, unless otherwise noted.)
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 up Threshold
EN Threshold Hysteresis
Soft Start
Thermal Shutdown
Thermal Hysteresis
160
20
V
EN
-Rising
1.05
V
FB
=0.807V
V
EN
=0V, V
SW
=12V
Minimum Duty Cycle
1.2
90
1.5
1.4
95
60
140
1.15
140
1.2
1.25
1.6
V
EN
=3.0V, V
FB
=1.1V
V
EN
=0 or EN = GND
T
A
= 25°C, 4V≤VIN ≤18V
0.791
0.807
200
150
1
Test Conditions
Min
4
0.4
Typ
Max
30
0.6
4
0.823
Unit
V
mA
μA
V
mΩ
mΩ
uA
A
MHz
%
nS
nS
V
mV
mS
℃
℃
Note (3): MOSFET on-resistance specifications are guaranteed by correlation to wafer level measurements.
Note (4): Thermal shutdown specifications are guaranteed by correlation to the design and characteristics analysis.
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RY8310
30V 1.2A 1.4MHz PWM SYN Step-Down Regulator
Typical Performance Characteristics
(5) (6)
Note (5): Performance waveforms are tested on the evaluation board.
Note (6): 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
=0.6A
Output Ripple Voltage
V
IN
=12V, V
OUT
=3.3V, I
OUT
=1.2A
Loop Response
V
IN
= 12V, V
OUT
=3.3V, I
INDUCTOR
=0.6A-1.2A
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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RY8310
30V 1.2A 1.4MHz PWM SYN 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
= 1.2A
Enable Shutdown at Full Load
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 1.2A
Power Up at No Load
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A
Power Up at No Load
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 1.2A
Email: support@rychip.com
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