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YB1692
2A Synchronous Step-Down Converter
Description
The YB1692 is a monolithic synchronous
buck regulator. The device integrates
130mMOSFETS that provide 2A
continuous load cur- rent over a wide
operating input voltage of 4.75V to 18V.
Current mode control provides fast
transient response and cycle-by-cycle cur-
rent limit.
An adjustable soft-start prevents inrush
current at turn-on. In shutdown mode, the
supply cur- rent drops below 1μA.
This device, available in an 8-pin SOP
pack- age, provides a very compact system
solution with minimal reliance on external
components.
Features
„ 2A Output Current
„ Wide 4.75V to 18V Operating Input
Range
„ Integrated 130mPower MOSFET
Switches
„ Output Adjustable from 0.923V to 15V
„ Up to 93% Efficiency
„ Programmable Soft-Start
„ Stable with Low ESR Ceramic Output
Capaci- tors
„ Fixed 340KHz Frequency
„ Cycle-by-Cycle Over Current
Protection
„ Input Under Voltage Lockout
„ Thermally Enhanced 8-Pin SOP
Package
Applications
„ Distributed Power Systems
„ Networking Systems
„ FPGA, DSP, ASIC Power Supplies
„ Green Electronics/ Appliances
„ Notebook Computers
Typical Application Circuit
YB1692 Rev.1.0
Figure1 Typical Application Circuit
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Pin Configuration
YB1692
2A Synchronous Step-Down Converter
SOP-8
Figure 2 Pin Configuration
Pin Description
Table 1
Pin Name
Description
High-Side Gate Drive Boost Input. BS supplies the drive for the
1 BS high-side N-Channel MOSFET switch. Connect a 0.01μF or greater
capacitor from SW to BS to power the high side switch.
Supply Voltage Input Pin. YB1692 operates from a 4.75V to 18VDC
2
VIN
voltage.
Bypass VIN to GND with a suitably large capacitor to eliminate noise
on the input.
3
SW
Power Switch Output Pin. SW is the switch node that supplies power
to the output.
4 GND Ground Pin.
Feedback Pin. Through an external resistor divider network,
5 FB FBsenses the output voltage and regulates it. The feedback threshold
voltage is 0.923V
Compensation Node. COMP is used to compensate the regulation
control loop. Connect a series RC network from COMP to GND to
6 COMP compensate the regulation control loop. In some cases, an additional
capacitor from COMP to GND is required. See Compensation
Components.
7
EN
Enable Pin. EN is a digital input that turns the regulator on or off.
Drive EN pin high to turn on the regulator, drive it low to turn it off.
Soft-Start Control Input. SS controls the soft-start period. Connect a
8
SS
capacitor from SS to GND to set the soft-start period. A 0.1μF
capacitor sets the soft-start period to 15ms. To disable the soft-start
feature, leave SS unconnected.
Ordering Information
Order Number
Package Type
YB1692SPX8
SOP-8
Supplied As
2500 units
Tape & Reel
Package Marking
YB1692
YB1692 Rev.1.0
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YB1692
2A Synchronous Step-Down Converter
Absolute Maximum Ratings(1)
Supply Voltage............................-0.3V to 20V
Switch Voltage..........................................21V
Bootstrap Voltage...... VSW -0.3V to VSW + 6V
Enable/UVLO Voltage...............–0.3V to +6V
Comp Voltage...........................–0.3V to +6V
Feedback Voltage.....................–0.3V to +6V
Junction Temperature ....................... +150
Lead Temperature ............................. +260
Storage Temperature........... –65°C to +150
Recommended Operating Conditions(2)
Input Voltage............................. 4.75V to 18V
Output Voltage.......................... 0.923 to 15V
Operating Temperature............–45to +85
Thermal Resistance(3) θJA θJC
SOP8 ................................ 90...... 45... /W
Notes:
(1) Exceeding these ratings may damage the
device.
(2) The device is not guaranteed to function
outside of its operating conditions.
(3) Measured on approximately 1”square of 1
oz copper.
Electrical and Optical Characteristics
Table 2 VIN = 12V, TA=25°C, Test Circuit Figure 1, unless otherwise noted.
Description
Input Voltage
Shutdown Supply Current
Supply Current
Feedback Voltage
Feedback Overvoltage Threshold
High-Side Switch Leakage
Soft-star Current
Soft-Start Period
Switch Current Limit
Oscillator Frequency
EN Pin Threshold
Internal MOS RDSON
Maximum Duty Cycle
Minimum On Time
Efficiency
Thermal Shutdown
Symbol
VIN
ISTBY
ICC
VFB
Test Conditions
VEN=0V
VEN=2V , VFB=1.0V
4.75VVIN 18
Min
4.75
900
ISS
ILIM
FOSC
VEN
RDSON
DMAX
VEN=0V , VSW=0V
VSS
CSS = 0.1μF
Minimum Duty Cycle
From Drain to Source
2.4
1.1
η
TOSTD
VIN=8V VOUT=3.3 IOUT=500mA
Typ.
1
1.3
923
1.1
6
15
3.4
1.1
340
1.5
130
90
220
93
160
Max Units
18 V
3 μA
1.5 mA
946 mV
V
10 μA
μA
ms
A
A
KHz
2.0 V
m
nS
°C
YB1692 Rev.1.0
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