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LM2736 データシート(PDF) 11 Page - Texas Instruments

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部品番号 LM2736
部品情報  Thin SOT23 750mA Load Step-Down DC-DC Regulator
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ホームページ  http://www.ti.com
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LM2736 データシート(HTML) 11 Page - Texas Instruments

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r =
'iL
lO
D =
VO + VD
VIN + VD - VSW
D =
VO
VIN
LM2736
www.ti.com
SNVS316E – SEPTEMBER 2004 – REVISED SEPTEMBER 2011
ENABLE PIN / SHUTDOWN MODE
The LM2736 has a shutdown mode that is controlled by the enable pin (EN). When a logic low voltage is applied
to EN, the part is in shutdown mode and its quiescent current drops to typically 30nA. Switch leakage adds
another 40nA from the input supply. The voltage at this pin should never exceed VIN + 0.3V.
SOFT-START
This function forces VOUT to increase at a controlled rate during start up. During soft-start, the error amplifier’s
reference voltage ramps from 0V to its nominal value of 1.25V in approximately 200µs. This forces the regulator
output to ramp up in a more linear and controlled fashion, which helps reduce inrush current.
OUTPUT OVERVOLTAGE PROTECTION
The overvoltage comparator compares the FB pin voltage to a voltage that is 10% higher than the internal
reference Vref. Once the FB pin voltage goes 10% above the internal reference, the internal NMOS control
switch is turned off, which allows the output voltage to decrease toward regulation.
UNDERVOLTAGE LOCKOUT
Undervoltage lockout (UVLO) prevents the LM2736 from operating until the input voltage exceeds 2.74V(typ).
The UVLO threshold has approximately 440mV of hysteresis, so the part will operate until VIN drops below
2.3V(typ). Hysteresis prevents the part from turning off during power up if VIN is non-monotonic.
CURRENT LIMIT
The LM2736 uses cycle-by-cycle current limiting to protect the output switch. During each switching cycle, a
current limit comparator detects if the output switch current exceeds 1.5A (typ), and turns off the switch until the
next switching cycle begins.
THERMAL SHUTDOWN
Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature
exceeds 165°C. After thermal shutdown occurs, the output switch doesn’t turn on until the junction temperature
drops to approximately 150°C.
Design Guide
INDUCTOR SELECTION
The Duty Cycle (D) can be approximated quickly using the ratio of output voltage (VO) to input voltage (VIN):
(12)
The catch diode (D1) forward voltage drop and the voltage drop across the internal NMOS must be included to
calculate a more accurate duty cycle. Calculate D by using the following formula:
(13)
VSW can be approximated by:
VSW = IO x RDS(ON)
(14)
The diode forward drop (VD) can range from 0.3V to 0.7V depending on the quality of the diode. The lower VD is,
the higher the operating efficiency of the converter.
The inductor value determines the output ripple current. Lower inductor values decrease the size of the inductor,
but increase the output ripple current. An increase in the inductor value will decrease the output ripple current.
The ratio of ripple current (
ΔiL) to output current (IO) is optimized when it is set between 0.3 and 0.4 at 750mA.
The ratio r is defined as:
(15)
Copyright © 2004–2011, Texas Instruments Incorporated
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