Datasheet

LM25005
SNVS411C –JANUARY 2006–REVISED MARCH 2013 www.ti.com
Electrical Characteristics
Specifications with standard typeface are for T
J
= 25°C, and those with boldface type apply over full Operating Junction
Temperature range. V
IN
= 24V, R
T
= 32.4kΩ unless otherwise stated.
(1)
Symbol Parameter Conditions Min Typ Max Units
STARTUP REGULATOR
VccReg Vcc Regulator Output 6.85 7.15 7.45 V
Vcc LDO Mode turn-off 9 V
Vcc Current Limit Vcc = 0V 20 mA
VCC SUPPLY
Vcc UVLO Threshold (Vcc increasing) 5.95 6.35 6.75 V
Vcc Undervoltage Hysteresis 1 V
Bias Current (Iin) FB = 1.3V 3 4.5 mA
Shutdown Current (Iin) SD = 0V 50 85 µA
SHUTDOWN THRESHOLDS
Shutdown Threshold (SD Increasing) 0.5 0.7 0.9 V
Shutdown Hysteresis 0.1 V
Standby Threshold (Standby Increasing) 1.18 1.225 1.27 V
Standby Hysteresis 0.1 V
SD Pull-up Current Source 5 µA
SWITCH CHARACTERSICS
Buck Switch Rds(on) 160 320 mΩ
BOOST UVLO 3.8 V
BOOST UVLO Hysteresis 0.56 V
Pre-charge Switch Rds(on) 75 Ω
Pre-charge Switch on-time 275 ns
CURRENT LIMIT
Cycle by Cycle Current Limit RAMP = 0V 3 3.5 4.25 A
Cycle by Cycle Current Limit Delay RAMP = 2.5V 100 ns
SOFT-START
SS Current Source 7 10 14 µA
OSCILLATOR
Frequency1 180 200 220 KHz
Frequency2 RT = 11kΩ 425 485 525 KHz
SYNC Source Impedance 10 kΩ
SYNC Sink Impedance 160 Ω
SYNC Threshold (falling) 1.4 V
Upper SYNC Frequency 550 KHz
SYNC Pulse Width Minimum 15 ns
RAMP GENERATOR
Ramp Current 1 Vin = 36V, Vout=10V 136 160 184 µA
Ramp Current 2 Vin = 10V, Vout=10V 18 25 32 µA
PWM COMPARATOR
Forced Off-time 500 ns
Min On-time 80 ns
COMP to PWM Comparator Offset 0.7 V
(1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation
using Statistical Quality Control (SQC) methods. Limits are used to calculate Average Outgoing Quality Level (AOQL).
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