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LM34922 Datasheet Preview

LM34922 Datasheet

2A Constant On-Time Switching Regulator

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LM34922
www.ti.com
SNVS813A – JUNE 2012 – REVISED MARCH 2013
LM34922 28V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit
Check for Samples: LM34922
FEATURES
1
2 Input Operating Voltage Range: 6V to 28V
• Absolute Maximum Input Rating: 30V
• Integrated 2A N-Channel Buck Switch
• Adjustable Current Limit Allows for Smaller
Inductor
• Adjustable Output Voltage from 2.51V
• Minimum Ripple Voltage at VOUT
• Power Good Output
• Switching Frequency Adjustable to 1MHz
• COT Topology Features:
– Switching Frequency Remains Nearly
Constant with Load Current and Input
Voltage Variations
– Ultra-Fast Transient Response
– No Loop Compensation Required
– Stable Operation with Ceramic Output
Capacitors
– Allows for Smaller Output Capacitor and
Current Sense Resistor
• Adjustable Soft-Start Timing
• Thermal Shutdown
• Precision 2% Feedback Reference
DESCRIPTION
The LM34922 Constant On-time Step-Down
Switching Regulator features all the functions needed
to implement a low cost, efficient, buck bias regulator
capable of supplying up to 2A of load current. This
voltage regulator contains an N-Channel Buck switch,
a startup regulator, current limit detection, and
internal ripple control. The constant on-time
regulation principle requires no loop compensation,
results in fast load transient response, and simplifies
circuit implementation. The operating frequency
remains constant with line and load. The adjustable
valley current limit detection results in a smooth
transition from constant voltage to constant current
mode when current limit is reached, without the use
of current limit foldback. The PGD output indicates
the output voltage has increased to within 5% of the
expected regulation value. Additional features
include: Low output ripple, VIN under-voltage lock-
out, adjustable soft-start timing, thermal shutdown,
gate drive pre-charge, gate drive under-voltage lock-
out, and maximum duty cycle limit.
Typical Application, Basic Step-Down Regulator
6V to 28V
Input
CIN
VIN BST
LM34922
RT SW
CBST
L1
VPGD
Power
Good
RPGD
CSS
RT
PGD
SS
SGND
D1
CS
CSG
RS
FB
RFB2
RFB1
VOUT
COUT
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012–2013, Texas Instruments Incorporated




etcTI

LM34922 Datasheet Preview

LM34922 Datasheet

2A Constant On-Time Switching Regulator

No Preview Available !

LM34922
SNVS813A – JUNE 2012 – REVISED MARCH 2013
Connection Diagram
Exposed Pad on Bottom
Connect to Ground
www.ti.com
VIN
RT
PGD
SS
SGND
1
2
3
4
5
10 BST
9 SW
8 CS
7 CSG
6 FB
Figure 1. Top View
10-Lead HVSSOP-PowerPAD
Pin No.
1
2
3
4
5
6
7
8
9
10
Name
VIN
RT
PGD
SS
SGND
FB
CSG
CS
SW
BST
PIN DESCRIPTIONS
Description
Application Information
Input supply voltage
Operating input range is 6V to 28V. Transient capability is 30V. A low ESR
capacitor must be placed as close as possible to the VIN and SGND pins.
On-time Control
An external resistor from VIN to this pin sets the buck switch on-time, and the
switching frequency.
Power Good
Logic output indicates when the voltage at the FB pin has increased to above
95% of the internal reference voltage. Hysteresis is provided. An external
pull-up resistor to a voltage less than 7V is required.
Soft-Start
An internal current source charges an external capacitor to provide the soft-
start function.
Signal Ground
Ground for all internal circuitry other than the current limit sense circuit.
Feedback
Internally connected to the regulation comparator. The regulation level is
2.51V.
Current Sense Ground
Ground connection for the current limit sensing circuit. Connect to ground
and to the current sense resistor.
Current sense
Connect to the current sense resistor and the anode of the free-wheeling
diode.
Switching Node
Internally connected to the buck switch source. Connect to the external
inductor, cathode of the free-wheeling diode, and bootstrap capacitor.
Bootstrap capacitor connection of the Connect a 0.1µF capacitor from SW to this pin. The capacitor is charged
buck switch gate driver.
during the buck switch off-time via an internal diode.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2 Submit Documentation Feedback
Product Folder Links: LM34922
Copyright © 2012–2013, Texas Instruments Incorporated


Part Number LM34922
Description 2A Constant On-Time Switching Regulator
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