SYH113
High Efficiency, 500kHz, 3A, 18V Input
Synchronous Step Down Regulator
General Description
The SYH113 is a high efficiency 500 kHz synchronous
step-down DC-DC converter capable of delivering 3A
current. The SYH113 operates over a wide input
voltage range from 4.5V to 18V and integrates main
switch and synchronous switch with very low R
DS(ON)
to minimize the conduction loss.
Low output voltage ripple and small external inductor
and capacitor sizes are achieved with 500 kHz
switching frequency. It adopts the instant PWM
architecture to achieve fast transient responses for high
step down applications
Features
•
•
•
•
•
•
•
•
•
low R
DS(ON)
for internal switches (top/bottom):
80mΩ/40mΩ
4.5-18V input voltage range
3A output current capability
500 kHz switching frequency
Instant PWM architecture to achieve fast transient
responses.
Cycle-by-cycle peak current limitation
Internal softstart limits the inrush current
±1.5%
0.6V reference
TSOT23-6 package
Ordering Information
SYH113
□
(
□□
)
□
Tempera ture Code
Packa ge Code
Optional Spec Code
Applications
•
•
•
•
•
Set Top Box
Portable TV
Access Point Router
DSL Modem
LCD TV
Temperature Range:
-
40°C to 85°C
Ordering Number
SYH113ADC
Package type
TSOT23-6
Note
--
Typical Applications
Figure 1. Schematic Diagram
Figure 2. Efficiency Figure
SYH113 Rev.0.1
Silergy Corp. Confidential-prepared for Internal Use Only
1
SYH113
Pinout
(
top view)
BS
LX
GND
IN
FB
EN
TSOT23-6(FC)
Top Mark:
WCxyz
,
(Device
code: WC,
x=year code, y=week code, z= lot number code)
Pin Name
BS
GND
FB
Pin Number
1
2
3
Pin Description
Boot-Strap Pin. Supply high side gate driver. Decouple this pin to LX pin with
0.1uF ceramic cap.
Ground pin
Output Feedback Pin. Connect this pin to the center point of the output resistor
divider (as shown in Figure 1) to program the output voltage:
Vout=0.6*(1+R1/R2)
Enable control. Pull high to turn on. Do not float.
Input pin. Decouple this pin to GND pin with at least 1uF ceramic cap
Inductor pin. Connect this pin to the switching node of inductor
EN
IN
LX
4
5
6
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage ------------------------------------------------------------------------------------------------ 19V
Enable Voltage---------------------------------------------------------------------------------------------- VIN + 0.3V
FB Voltage ----------------------------------------------------------------------------------------------------------- 4V
Power Dissipation, PD @ TA = 25°C, TSOT23-6（FC）----------------------------------------------------- 1W
Package Thermal Resistance (Note 2)
θ
JA ------------------------------------------------------------------------------------------------------ 100°C /W
θ
JC ----------------------------------------------------------------------------------------------------- 11.2°C /W
Junction Temperature Range ----------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------- 260°C
Storage Temperature Range ------------------------------------------------------------------------- -65°C to 150°C
Recommended Operating Conditions
(Note 3)
Supply Input Voltage ---------------------------------------------------------------------------------------------- 4.5V to 18V
Junction Temperature Range ----------------------------------------------------------------------------------- -40°C to 125°C
Ambient Temperature Range -----------------------------------------------------------------------------------
-
40°C to 85°C
SYH113 Rev.0.1
Silergy Corp. Confidential-prepared for Internal Use Only
2
SYH113
Electrical Characteristics
(V
IN
= 12V, V
OUT
= 1.2V, L = 2.2uH, C
OUT
= 47uF, T
A
= 25°C, I
OUT
= 1A unless otherwise specified)
Parameter
Input Voltage Range
Quiescent Current
Shutdown Current
Feedback Reference
Voltage
FB Input Current
Top FET RON
Bottom FET RON
Top FET PeakCurrent
Limit
Bottom FET Valley
Current Limit
EN Rising Threshold
EN Falling Threshold
Input UVLO Threshold
UVLO Hysteresis
Min ON Time
Min OFF Time
Switching Frequency
Soft-start Time
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
Symbol
V
IN
I
Q
I
SHDN
V
REF
I
FB
R
DS(ON)1
R
DS(ON)2
I
LIM,TOP
I
LIM
V
ENH
V
ENL
V
UVLO
V
HYS
Test Conditions
I
OUT
=0
,
V
FB
=V
REF
*105%
EN=0
Min
4.5
Typ
100
5
0.6
Max
18
10
0.609
50
90
50
6
4.25
0.591
V
FB
=3.3V
-50
Unit
V
µA
µA
V
nA
mΩ
mΩ
A
A
V
V
V
V
ns
ns
kHz
uS
°C
°C
80
40
3
1.5
0.4
4.5
50
140
0.3
80
170
500
800
150
15
120
220
t
SS
T
SD
T
HYS
Note 1:
Stresses beyond the “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Note 2:
θ
JA is measured in the natural convection at T
A
= 25°C on a low effective 4-layer thermal conductivity test
board of JEDEC 51-3 thermal measurement standard. Pin2 of TSOT23-6 packages is the case position for
θ
JC
measurement.
Note 3:
The device is not guaranteed to function outside its operating conditions
SYH113 Rev.0.1
Silergy Corp. Confidential-prepared for Internal Use Only
3
SYH113
TSOT23-6L (FC)Package outline & PCB layout
1.90
2.80 - 3.10
2.40
0.95
0.60
1.00
2.70 - 3.00
0.30 - 0.50
Recommended Pad Layout
1.50 - 1.70
1.00 (max)
0.95 TYP
1.90 TYP
0.1 - 0.20
0.3 - 0.6
Notes:
All dimension in MM
All dimension don’t not include mold flash & metal burr
SYH113 Rev.0.1
Silergy Corp. Confidential-prepared for Internal Use Only
0.25 REF
4
0.01 - 0.1
SYH113
Taping & Reel Specification
1. Taping orientation
TSOT23-6
3.9/4.1
1.45/1.55
7.7/8.3
Feeding direction
2. Carrier Tape & Reel specification for packages
Reel
Width
Reel
Size
Package
types
SOT23-6
Tape
width
(mm)
8
Pocket
pitch(mm)
4
Reel size
(Inch)
7"
Reel
width(mm)
8.4
Trailer
length(mm)
280
Leader length
(mm)
160
Qty per
reel
3000
3. Others: NA
SYH113 Rev.0.1
Silergy Corp. Confidential-prepared for Internal Use Only
5
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