LM26001QMXAX/NOPB National Semiconductor, LM26001QMXAX/NOPB Datasheet

IC REG SW 1.5A W/SLEEP 16-TSSOP

LM26001QMXAX/NOPB

Manufacturer Part Number
LM26001QMXAX/NOPB
Description
IC REG SW 1.5A W/SLEEP 16-TSSOP
Manufacturer
National Semiconductor
Series
PowerWise®r
Type
Step-Down (Buck)r
Datasheet

Specifications of LM26001QMXAX/NOPB

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.25 ~ 35 V
Current - Output
1.5A
Frequency - Switching
150kHz ~ 500kHz
Voltage - Input
4 ~ 38 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
Power - Output
2.6W
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM26001QMXAX

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM26001QMXAX/NOPB
Manufacturer:
MOLEX
Quantity:
10 000
Company:
Part Number:
LM26001QMXAX/NOPB
Quantity:
4 300
© 2010 National Semiconductor Corporation
1.5A Switching Regulator with High Efficiency Sleep Mode
General Description
The LM26001 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 LM26001 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 38V
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.
Typical Application Circuit
201794
LM26001/LM26001Q
Features
Applications
LM26001Q is an Automotive Grade product that is AEC-
Q100 grade 1 qualified (-40°C to +125°C operating
junction temperature)
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 38V continuous input range
1.5% 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
Automotive Telematics
Navigation systems
In-Dash Instrumentation
Battery Powered Applications
Stand-by power for home gateways/set-top boxes
November 29, 2010
20179401
www.national.com

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LM26001QMXAX/NOPB Summary of contents

Page 1

... 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. Typical Application Circuit © 2010 National Semiconductor Corporation LM26001/LM26001Q Features ■ LM26001Q is an Automotive Grade product that is AEC- Q100 grade 1 qualified (-40°C to +125°C operating junction temperature) ■ ...

Page 2

Connection Diagram Ordering Information Order Number Package Type LM26001MXA TSSOP-16EXP LM26001MXAX TSSOP-16EXP LM26001QMXA TSSOP-16EXP LM26001QMXAX TSSOP-16EXP *Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies. Reliability qualification is compliant with the ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Voltages from the indicated pins to GND: VIN -0.3V to 40V SW (Note 7) -0.5V to 40V VDD -0. VBIAS -0.3V to 10V FB -0. BOOT SW-0.3V to SW+7V PGOOD -0 ...

Page 4

Symbol Parameter F Lower frequency synchronization SYNC_DN range T Minimum Off-time OFFMIN T Minimum On-time ONMIN TH Sleep mode threshold hysteresis SLEEP_HYS TH Wake up threshold WAKE I BOOT pin leakage current BOOT Protection I Peak Current Limit LIMPK V ...

Page 5

Typical Performance Characteristics 12V 25°C. J VFB vs Temperature IQ and IVBIAS vs Temperature (Sleep Mode) Normalized Switching Frequency vs Temperature (300kHz) Unless otherwise specified the following conditions apply: Vin = (IDC = 300 mA) 20179403 IQ and ...

Page 6

Peak Current Limit vs Temperature Efficiency vs Load Current (330kHz) Startup Waveforms www.national.com Short Circuit Foldback Frequency vs V 20179415 Efficiency vs Load Current (500kHz) 20179408 Load Transient Response 20179410 6 FB (325 kHz nominal) 20179412 20179409 20179452 ...

Page 7

Low Input Voltage Dropout Nominal VOUT = 5V 20179453 7 www.national.com ...

Page 8

Block Diagram www.national.com 8 20179418 ...

Page 9

Operation Description GENERAL The LM26001 is a current mode PWM buck regulator. At the beginning of each clock cycle, the internal high-side switch turns on, allowing current to ramp up in the inductor. The in- ductor current is internally monitored ...

Page 10

Iin = Dwake Where I is the gate drive current, calculated as (4 And Io is the sum of Iload, ...

Page 11

Frequency reduc- tion begins at 20% below the nominal frequency setting. The minimum operating frequency in foldback mode is 71 kHz typical. If the ...

Page 12

VIN, it will not discharge through VIN. Therefore when the VIN voltage drops rapidly, VDD may remain high, especially in sleep mode. For fast line voltage transients, using a larger capacitor at the VDD pin ...

Page 13

When choosing the inductor, the saturation current rating must be higher than the maximum peak inductor current and the RMS current rating should be higher than the maximum load current. Peak inductor current, Ipeak, is calculated as: For example, at ...

Page 14

A Schottky diode must be used. It's low forward voltage max- imizes efficiency and BOOT voltage, while also protecting the SW pin against large negative voltage spikes COMPENSATION The purpose of loop compensation is to ensure stable oper- ation while ...

Page 15

Where B is the desired feedback gain in v/v between fp and fz, and gm is the transconductance of the error amplifier. A gain value around 10dB (3.3v/v) is generally a good starting point. Bandwidth increases with increasing values of ...

Page 16

Thermal Considerations and TSD Although the LM26001 has a built in current limit, at ambient temperatures above 80°C, device temperature rise may limit the actual maximum load current. Therefore, temperature rise must be taken into consideration to determine the maximum ...

Page 17

Physical Dimensions inches (millimeters) unless otherwise noted eTSSOP-16 Package 16-Lead Exposed Pad TSSOP Package NS Package Number MXA16A 17 www.national.com ...

Page 18

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