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TPS61060
TPS61061
TPS61062
SLVS538 – NOVEMBER 2004
PARAMETER
FEEDBACK FB
I
FB
V
FB
V
FB
r
DS(ON)
R
DS(ON)
I
swleak
I
SW
f
s
OUTPUT
Vovp
Vovp
Vovp
Vovp
Vo
Vo
Output overvoltage protection
Output overvoltage protection
Output overvoltage protection
Output overvoltage protection hysteresis
Output voltage threshold for short-circuit
detection
Output voltage threshold for short-circuit
detection
Feedback input bias current
Feedback regulation voltage
Feedback regulation voltage
P-channel MOSFET on-resistance
N-channel MOSFET on-resistance
N-channel MOSFET on-resistance
Switch leakage current
N-Channel MOSFET current limit
Switching frequency
TEST CONDITIONS
V
FB
= 500 mV
ILED = GND, after start-up
ILED = High, after start-up
V
O
= 10 V, Isw = 10 mA
V
IN
= V
GS
= 3.6 V, Isw = 100 mA
V
IN
= V
GS
= 2.7 V, Isw = 100 mA
V
IN
= V
SW
=6.0 V, V
OUT
= GND,
EN=GND
V
O
= 10 V
MIN
TYP
1
MAX
1.5
515
260
3.7
0.9
1.0
2
475
1.2
16
19.8
25
UNIT
uA
mV
mV
Ω
Ω
Ω
µA
mA
MHz
V
V
V
V
V
V
485
240
500
250
2.5
0.6
0.7
0.1
POWER SWITCH SYNCHRONOUS RECTIFIER AND CURRENT LIMIT (SW)
325
0.8
400
1.0
14.5
18.5
23.5
0.7
V
IN
–0.7
V
IN
–0.3
OSCILLATOR
V
O
rising; TPS61060
V
O
rising; TPS61061
V
O
rising; TPS61062
TPS61060/61/62, V
O
falling
V
O
falling
V
O
rising
Start-up, EN = low to high,
OUT = GND
14
18
22.2
Ipre
Pre-charge current and short circuit current V
IN
= 6 V
V
IN
= 3.6 V
V
IN
= 2.7 V
Maximum duty cycle
180
95
65
95%
mA
D
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
η
Efficiency
vs LED current; 2 LEDs, ILED = high
vs LED current; 3 LEDs, ILED = low
vs LED current; 3 LEDs, ILED = high
vs LED current; 4 LEDs, ILED = low
vs LED current; 4 LEDs, ILED = high
vs LED current; 5 LEDs, ILED = high
PWM dimming
Digital brightness control
LED current
Soft-start operation
Short-circuit protection
Overvoltage protection
Input voltage ripple
Feedback voltage vs ILED program-
ming step
vs PWM duty cycle
2
3
4
5
6
7
8
9
10
11
12
13
14
5
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