參數(shù)資料
型號： P95020NQG8
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132
封裝： 10 X 10 MM, 0.85 MM HEIGHT, QFN-132
文件頁數(shù)： 169/169頁
文件大小： 4297K
代理商： P95020NQG8
IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
99
2011 Integrated Device Technology, Inc.
LED Boost – Operating Requirements
-
Both LED strings must contain the same number of LEDs with similar forward voltage drops for each LED.
-
The block requires one external NFET and an external Schottky diode (rated ≥ 45V for 10 White LEDs in series). The
output power is limited by the voltage and current ratings of the external FET and Schottky diode.
-
If only one LED string is used, SINK1 and SINK2 must be shorted together. The maximum current and current per
programming step for the combined strings can remain at full (50 mA total, 0.78 mA/step) or can be reduced (25 mA total,
0.39 mA/step).
LED Boost – Electrical Characteristics
Unless otherwise specified, typical values at TA = 25°C, VIN=VSYS = 3.8V, VPGND=VDGND=0V, VLED_BOOST_SINK=0.9V,
TA = 0°C to +70°C, COUT=2.2F, L=22H.
Table 157. LED Boost Electrical Characteristics
SYMBOL
DESCRIPTION
CONDITIONS
MIN
TYP MAX UNIT
VIN
LED Boost Input Voltage
If tied to other than
VSYS = 3.0V to 4.5V
3.0
5.5
V
LEDREG
LED Boost Regulation Voltage
0.90
V
VOVP
OVP Trip Voltage
Trip level of LED_BOOST_VSENSE input
1.15
1.25
V
VISENSE
Current Sense Maximum Voltage
VSYS = 3.0V to 4.5V
150
180
210
mV
IBIAS
Input Bias Current For OVP and Isense
-0.1
0.1
A
TGRISE
LED_BOOST_GATE Pin Rise Time
CGATE = 1nF
12
ns
TGFALL
LED_BOOST_GATE Pin Fall Time
CGATE = 1nF
7
ns
ISINK_FULL
LED Current Range – Full Scale
LED_BOOST_IOUT 0x86 [4:0],
LED_BOOST_SCALE 0x86 [6:6] =
0 - Half Scale, 1 - Full Scale
0.78
0.39
25
12.5
mA
Δ ISINK_FULL LED Current Step Size (LSB) – Full Scale
0.78
mA
Δ ISINK_HALF LED Current Step Size (LSB) – Half Scale
0.39
mA
LEDSLEW
LED Current Step Slew Rate
ILED Change From 5mA to 20mA
1/32
LSB/us
InitACC
Initial Current Accuracy
ISINK = 20 mA, VSINK = 0.9V
-5
+5
%
fCLKL
Main Clock (Low)
LED_BOOST_CTRL 0x87 [1:1] =
0 =0.5 MHz, [Note 1]
0.5
MHz
fCLKH
Main Clock (High)
LED_BOOST_CTRL 0x87 [1:1] =
1 = 1.0 MHz, [Note 1]
1.0
MHz
DCLOCK
Max Gate Output Duty Cycle
94
%
tON(MIN)
Minimum Output On Time
100
ns
IQPS
VLED_BOOST_VIN Shutdown Current
VLED_BOOST_VIN = 4.5V
1
A
IDD
Operating Current
[Note 2]
1.6
mA
UVLO
Under Voltage Lock Out Threshold
VSYS Rising. (Shared DC/DC, LDOs
except Pre-DC/DC)
2.85 2.95
V
UVLOHYST
Under Voltage Lock Out Hysteresis
150
mV
Note 1: Guaranteed by design and/or characterization.
Note 2: Value does not include current through external components.
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