Datasheet

TPS61175
www.ti.com SLVS892B –DECEMBER 2008–REVISED FEBRUARY 2012
ELECTRICAL CHARACTERISTICS
FSW = 1.2 MHz (Rfreq=80 kΩ), Vin=3.6V, T
A
= –40°C to +85°C, typical values are at T
A
= 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V
IN
Input voltage range 2.9 18 V
I
Q
Operating quiescent current into Vin Device PWM switching without load 3.5 mA
I
SD
Shutdown current EN=GND 1.5 μA
V
UVLO
Under-voltage lockout threshold 2.5 2.7 V
V
hys
Under-voltage lockout hysteresis 130 mV
ENABLE AND REFERENCE CONTROL
V
enh
EN logic high voltage Vin = 2.9 V to 18 V 1.2 V
V
enl
EN logic low voltage Vin = 2.9 V to 18 V 0.4 V
V
SYNh
SYN logic high voltage 1.2
V
SYNl
SYN logic low voltage 0.4 V
R
en
EN pull down resistor 400 800 1600 kΩ
T
off
Shutdown delay, SS discharge EN high to low 10 ms
VOLTAGE AND CURRENT CONTROL
V
REF
Voltage feedback regulation voltage 1.204 1.229 1.254 V
I
FB
Voltage feedback input bias current 200 nA
I
sink
Comp pin sink current V
FB
= V
REF
+ 200 mV, V
COMP
= 1 V 50 μA
I
source
Comp pin source current V
FB
= V
REF
–200 mV, V
COMP
= 1 V 130 μA
V
CCLP
Comp pin Clamp Voltage High Clamp, V
FB
= 1 V 3 V
Low Clamp, V
FB
= 1.5 V 0.75
V
CTH
Comp pin threshold Duty cycle = 0% 0.95 V
G
ea
Error amplifier transconductance 240 340 440 μmho
R
ea
Error amplifier output resistance 10 MΩ
f
ea
Error amplifier crossover frequency 500 KHz
FREQUENCY
Rfreq = 480 kΩ 0.16 0.21 0.26
f
S
Oscillator frequency Rfreq = 80 kΩ 1.0 1.2 1.4 MHz
Rfreq = 40 kΩ 1.76 2.2 2.64
D
max
Maximum duty cycle V
FB
= 1.0 V, Rfreq = 80 kΩ 89% 93%
V
FREQ
FREQ pin voltage 1.229 V
T
min_on
Minimum on pulse width Rfreq = 80 kΩ 60 ns
POWER SWITCH
R
DS(ON)
N-channel MOSFET on-resistance V
IN
= V
GS
= 3.6 V 0.13 0.25 Ω
V
IN
= V
GS
= 3.0 V 0.13 0.3
I
LN_NFET
N-channel leakage current V
DS
= 40 V, T
A
= 25°C 1 μA
OC, OVP AND SS
I
LIM
N-Channel MOSFET current limit D = D
max
3 3.8 5 A
I
SS
Soft start bias current Vss = 0 V 6 μA
THERMAL SHUTDOWN
T
shutdown
Thermal shutdown threshold 160 °C
T
hysteresis
Thermal shutdown threshold hysteresis 15 °C
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