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参数资料
| 型号： | TPS60251RTWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 750 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件页数： | 20/26页 |
| 文件大小： | 783K |
| 代理商： | TPS60251RTWR |
www.ti.com
SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007
ELECTRICAL CHARACTERISTICS (continued)
VI = 3.5 V, TA = –40°C to 85°C, RIS = 562 k, typical values are at TA = 25°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
VUVLO2
UVLO Threshold voltage2(2)
VI falling
1.2
1.3
1.5
V
Vhys
Under-voltage lockout hysterisis
UVLO1
210
mV
VENA_H
Enable high threshold voltage
1.5
VI
V
VENA_L
Enable low threshold voltage
0.4
V
VI = 3 V, CO = 1 F,
TS
Soft start time(3)
0.5
ms
IMAIN_LED = 15 mA × 4
CHARGE PUMP
Vout
Overvoltage limit
6.5
V
Fs
Switching frequency
750
kHz
×1 Mode, (V
I –VO)/IO
1.2
RO
Open loop output impedance
×1.5 Mode, (V
I × 1.5 – VO)/IO VI = 3.0V (IO =
3.5
5.0
120mA)
CURRENT SINK
Current matching of sub LEDs at light
ISUB_LED = 100 A × 2, VDXX = 0.4 V
Km_sub
0
±2%
load condition(4)
IMAIN_LED = 15 mA × 4,
Km_main
LED to LED Current matching(5)
±0.1%
±5%
3.0 V
≤ VI ≤ 4.2 V
Ka
Current accuracy
ILED = 15 mA
±6%
Main and Sub Display Current Register =
Maximum LED current of DM1-4 and
ID_MS
0
×01&2(111111),
25.5
mA
DS1-2
VDXX = 0.2 V
ID_DM5
Maximum LED current of DM5
Aux Display Current Register = 0
×03 (XXXX11)
80
mA
VIS
IS Pin voltage
3.0V
≤ VI ≤ 6.0V
1.229
1.254
1.279
V
ILED = 100 A
(6)
44.8
Output current to current set ratio sub
Isub
LEDs
6722
ILED = 15 mA
(6)
44.8
ILED = 100 A
(6)
Output current to current set ratio main
Imain
LEDs
6722
ILED = 15 mA
(6)
IDM5
Output current to current set ratio DM5
35853
ILED = 80 mA
(6)
VDropOut
LED Drop out voltage
See (7)
80
120
mV
1
× Mode to 1.5× mode transition
VDXX Falling, 15 mA × 4 measured on the
VTH_GU
85
100
120
mV
threshold voltage(8)
lowest VDXX
Input voltage hysteresis for 1.5
× to 1×
Measured as VI – (VO – VDXX_MIN), IMAIN_LED =
VTH_GD
550
mV
mode transition
15 mA
× 4
SERIAL INTERFACE TIMING REQUIREMENTS
fmax
Clock frequency
400
kHz
twH(HIGH)
Pulse duration, clock high time
600
ns
twL(LOW)
Pulse duration, clock low time
1300
ns
tr
DATA and CLK rise time
300
ns
tf
DATA and CLK fall time
300
ns
High time (repeated) START
th(STA)
condition(after this period the first clock
600
ns
pulse is generated)
Setup time for repeated START
tsu(STA)
600
ns
condition
th(DATA)
Data input hold time
0
ns
tsu(DATA)
Data input setup time
100
ns
(2)
Shut down completely and come up with all 0's after device restart
(3)
Measurement Condition: From enabling the LED driver to 90% output voltage after VI is already up.
(4)
LED current matching is defined as: (ISUB_LED_WORST – IAVG_SUB) / IAVG_SUB
(5)
LED to LED Current Matching is defined as: (IMAIN_LED_WORST – IAVG_MAIN) / IAVG_MAIN
(6)
See the Setting the LED Current section of the data sheet for details on calculating LED current given by dimming step and RIS.
(7)
Dropout Voltage is defined as VDXX (WLED Cathode) to GND voltage at which current into the LED drops 10% from the LED current at
VDXX = 0.2 V, WLED current = 15 mA × 4.
(8)
As VI drops, VDXX eventually falls below the switchover threshold of 100mV, and TPS60251 switches to 1.5× mode. See the Operating
Principle section for details about the mode transition thresholds.
Copyright 2007, Texas Instruments Incorporated
3
Product Folder Link(s): TPS60251
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