Datasheet

TPS61045
www.ti.com SLVS440B –JANUARY 2003–REVISED MARCH 2009
ELECTRICAL CHARACTERISTICS
V
IN
= 2.4 V, CTRL = V
IN
, V
O
= 18 V, I
O
= 10 mA, 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 1.8 6 V
I
Q
Operating quiescent current I
O
= 0 mA, not switching 40 65 mA
I
O(SD)
Shutdown current CTRL = GND 0.1 1 mA
UVLO Undervoltage lockout threshold V
IN
falling 1.5 1.7 V
CTRL and DAC output
V
IH
CTRL high level input voltage 1.3 V
V
IL
CTRL low level input voltage 0.3 V
I
lkg
CTRL input leakage current CTRL = GND or V
IN
0.1 mA
V
O(DO)
DAC output voltage range 0 1.233 V
DAC resolution 6 Bit 19.6 mV
V
O(DO)
DAC center output voltage CTRL = high 607 mV
I
O(SINK)
Maximum DAC sink current 30 mA
t
UP
Increase output voltage one step CTRL = high to low to high 1 60 ms
t
DWN
Decrease the output voltage one step CTRL = high to low to high 140 240 ms
t
d1
Delay time between up/down steps CTRL = low to high to low 1 ms
t
OFF
Shutdown CTRL = high to low to high 560 ms
Input switch (Q1), main switch (Q2) and current limit
V
SW(Q2)
Main switch maximum voltage (Q2) 30 V
r
DS(on)
Main switch MOSFET on-resistance V
IN
= 2.4 V; I
S
= 200 mA 400 800 mΩ
I
lkg
Main switch MOSFET leakage current V
S
= 28 V 0.1 10 mA
I
LIM
Main switch MOSFET current limit 300 375 450 mA
r
DS(on)
Input switch MOSFET on-resistance V
IN
= 2.4 V; I
S
= 200 mA 1 2 Ω
I
lkg
Input switch MOSFET leakage current V
L
= GND, V
IN
= 6 V 0.1 10 mA
Output
V
O
Output voltage range Vin 28 V
V
ref
Internal voltage reference 1.233 V
I
FB
Feedback input bias current VFB = 1.3 V 30 100 nA
Feedback trip point voltage 1.8 V ≤ V
IN
≤ 6 V; V
O
= 18 V, I
LOAD
= 10 mA 1.208 1.233 1.258 V
V
FB
1.8 V ≤ V
IN
≤ 3.6 V; V
O
= 18 V,
Feedback trip point voltage 1.214 1.233 1.251 V
I
LOAD
= 10 mA , T
A
= 0°C to 85°C
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