B340L MPS [Monolithic Power Systems], B340L Datasheet - Page 3

• Manufacturer Part Number: B340L
• Description: 2A, 32V, 330KHz Step-Down Converter
• Manufacturer: MPS [Monolithic Power Systems]

ELECTRICAL CHARACTERISTICS
V
Notes:
4) These parameters are guaranteed by design, not production tested.
5) Equivalent output current = 1.5A ≥ 50% Duty Cycle
PIN FUNCTIONS
MP1591 Rev. 2.3
9/27/2006
Parameter
Thermal Shutdown
REF Voltage
REF Load Regulation
REF Line Regulation
Pin #
IN
Assumes ripple current = 30% of load current.
Slope compensation changes current limit.
1
2
3
4
5
6
7
8
= 12V, T
COMP Compensation Node. COMP is used to compensate the regulation control loop. Connect a
Name Description
GND
REF
SW
BS
EN
FB
IN
A
= +25°C, unless otherwise noted.
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET
switch. Connect a 10nF or greater capacitor from SW to BS to power the high-side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 6.5V to 32V power source. Bypass IN to GND with a suitably large capacitor to
eliminate noise on the input to the IC. See Input Capacitor.
Power Switching Output. SW is the switching node that supplies power to the output. Connect
the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS
to power the high-side switch.
Ground. For the MP1591DN, connect the Exposed Pad to pin 4.
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a resistive
voltage divider from the output voltage. The feedback threshold is 1.230V. See Setting the
Output Voltage.
series RC network from COMP to GND to compensate the regulation control loop. In some
cases, an additional capacitor from COMP to GND is required. See Compensation.
Enable/UVLO. A voltage greater than 2.8V enables operation. For complete low current
shutdown the EN pin voltage needs to be less than 800mV.
Reference Output. REF is the 5V reference voltage output. It can supply up to 1mA to external
circuitry. If used, bypass REF to GND with 10nF or greater capacitor. Leave REF unconnected
if not used.
(4)
(4)
(4)
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2.0A ≤ 50% Duty Cycle
Symbol Condition
© 2006 MPS. All Rights Reserved.
www.MonolithicPower.com
I
∆I
I
REF
REF
MP1591 – 2A, 32V, 330KHz STEP-DOWN CONVERTER
REF
(continued)
= 100µA, V
= 0
= 0 to 1mA
IN
= 6.5 to 32V
Min
Typ
160
100
5.0
30
Max
Units
mV
mV
°C
V
3