Datasheet

TPS40090
TPS40091
SLUS578B –OCTOBER 2003– REVISED MAY 2006 www.ti.com
ELECTRICAL CHARACTERISTICS
T
A
= -40°C to 85°C, V
IN
= 12 V, R
(RT)
= 64.9 kΩ, T
J
= T
A
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
V
IN
Operating voltage range, VIN 4.5 15
V
IN
UVLO Rising V
IN
4.25 4.45 V
V
IN
UVLO
(1)
Falling V
IN
4.1 4.35
I
IN
Shutdown current, VIN 2 10 μA
I
IN
Quiescent current switching Four channels, 400 kHz each, no load 4 6 mA
OSCILLATOR/SYNCHRONIZATION
Phase frequency accuracy Four channels, R
RT
= 64.9 kΩ 370 415 455
Phase frequency set range
(1)
Four channels 100 1200 kHz
Synchronization frequency range
(1)
Four channels 800 9600
Synchronization input threshold
(1)
Four channels V
BP5
/2 V
PWM
4-phase operation 87.5%
Maximum duty cycle per channel
2- and 3-phase operation 83.3%
Minimum duty cycle per channel
(1)
0
Minimum controllable on-time
(1)
50 100 ns
ERROR AMPLIFIER
Feedback input voltage 0.693 0.700 0.707 V
Feedback input bias current V
FB
= 0.7 V 25 150 nA
V
OH
High-level output voltage I
COMP
= -1 mA 2.5 2.9
V
V
OL
low-level output voltage I
COMP
= 1 mA 0.5 0.8
G
BW
Gain bandwidth
(1)
5 MHz
A
VOL
Open loop gain
(1)
90 dB
SOFT START
I
SS
Soft-start source current 3.5 5 6 μA
V
SS
Soft-start clamp voltage 0.95 1.00 1.05 V
ENABLE
Enable threshold voltage 0.8 2 2.5
V
Enable voltage capability
(1)
V
IN(max)
PWM OUTPUT
PWM pull-up resistance I
OH
= 5 mA 27 45
Ω
PWM pull-down resistance I
OL
= 10 mA 27 45
I
lkg
PWM output leakage
(1) (2)
3-State 1 μA
5V REGULATOR
V
OUT
Output voltage External I
LOAD
= 2 mA on BP5 4.8 5 5.2 V
Pass device voltage drop V
IN
= 4.5 V, No external load on BP5 200 mV
Short circuit current 10 30 mA
(1) Specified by design. Not production tested.
(2) TPS40091 only.
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