Switching Regulator. LM26001B Datasheet

LM26001B Regulator. Datasheet pdf. Equivalent

Part LM26001B
Description 1.5A Switching Regulator
Feature LM26001B 1.5A Switching Regulator with High Efficiency Sleep Mode May 29, 2008 LM26001B 1.5A Switc.
Manufacture National Semiconductor
Datasheet
Download LM26001B Datasheet

LM26001B 1.5A Switching Regulator with High Efficiency Sleep LM26001B Datasheet
LM26001B www.ti.com SNVS491B – MAY 2007 – REVISED APRIL 20 LM26001B Datasheet
Recommendation Recommendation Datasheet LM26001B Datasheet




LM26001B
May 29, 2008
LM26001B
1.5A Switching Regulator with High Efficiency Sleep Mode
General Description
The LM26001B is a switching regulator designed for the high
efficiency requirements of applications with stand-by modes.
The device features a low-current sleep mode to maintain ef-
ficiency under light-load conditions and current-mode control
for accurate regulation over a wide input voltage range. Qui-
escent current is reduced to 10 µA typically in shutdown mode
and less than 40 µA in sleep mode. Forced PWM mode is also
available to disable sleep mode.
The LM26001B can deliver up to 1.5A of continuous load cur-
rent with a fixed current limit, through the internal N-channel
switch. The part has a wide input voltage range of 4.0V to 18V
and can operate with input voltages as low as 3V during line
transients.
Operating frequency is adjustable from 150 kHz to 500 kHz
with a single resistor and can be synchronized to an external
clock.
Other features include Power good, adjustable soft-start, en-
able pin, input under-voltage protection, and an internal boot-
strap diode for reduced component count.
Features
High efficiency sleep mode
40 µA typical Iq in sleep mode
10 µA typical Iq in shutdown mode
3.0V minimum input voltage
4.0V to 18V continuous input range
2.0% reference accuracy
Cycle-by-cycle current limit
Adjustable Frequency (150 kHz to 500 kHz)
Synchronizable to an external clock
Power Good Flag
Forced PWM function
Adjustable Soft-start
TSSOP-16 exposed pad package
Thermal Shut Down
Applications
Automotive Telematics
Navigation systems
In-Dash Instrumentation
Battery Powered Applications
Stand-by power for home gateways/set-top boxes
Typical Application Circuit
© 2008 National Semiconductor Corporation 300019
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30001901
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LM26001B
Connection Diagram
Top View
30001902
16-Lead Exposed Pad TSSOP Package
Ordering Information
Order Number
LM26001BMH
LM26001BMHX
Pin Descriptions
Package Type
TSSOP-16EXP
TSSOP-16EXP
Package Drawing
MXA16A
MXA16A
Supplied As
92 Units of Rail
2500 Units of Tape and Reel
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
EP
Pin Name
VIN
VIN
PGOOD
EN
SS
COMP
FB
GND
FREQ
FPWM
SYNC
VBIAS
VDD
BOOT
SW
SW
EP
Description
Power supply input
Power supply input
Power Good pin. An open drain output which goes high when the output voltage is greater than
92% of nominal.
Enable is an analog level input pin. When pulled below 0.8V, the device enters shutdown mode.
Soft-start pin. Connect a capacitor from this pin to GND to set the soft-start time.
Compensation pin. Connect to a resistor capacitor pair to compensate the control loop.
Feedback pin. Connect to a resistor divider between Vout and GND to set output voltage.
Ground
Frequency adjust pin. Connect a resistor from this pin to GND to set the operating frequency.
FPWM is a logic level input pin. For normal operation, connect to GND. When pulled high, sleep
mode operation is disabled.
Frequency synchronization pin. Connect to an external clock signal for synchronized operation.
SYNC must be pulled low for non-synchronized operation.
Connect to an external 3V or greater supply to bypass the internal regulator for improved efficiency.
If not used, VBIAS should be tied to GND.
The output of the internal regulator. Bypass with a minimum 1.0 µF capacitor.
Bootstrap capacitor pin. Connect a 0.1µF minimum ceramic capacitor from this pin to SW to
generate the gate drive bootstrap voltage.
Switch pin. The source of the internal N-channel switch.
Switch pin. The source of the internal N-channel switch.
Exposed Pad thermal connection. Connect to GND.
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