參數(shù)資料
型號： P95020ZLLGI8
廠商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類： 電源管理
英文描述： 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA124
封裝： LLGA-124
文件頁數(shù)： 120/137頁
文件大小： 3533K
代理商： P95020ZLLGI8
P95020 / Preliminary Datasheet
Revision 0.7.10
83
2010 Integrated Device Technology, Inc.
9.0 HIGH EFFICIENCY 10 LED BOOST CONVERTER AND SINKS
FEATURES
Fully controllable by a host or I2C interface
Peak efficiency > 88% with two strings of 10 LEDs
Low Shutdown Current (<1uA)
0.5MHz or 1MHz fixed frequency low noise operation
Supports up to two (2) strings of 3 to 10
series-connected white LEDs
Programmable Sink current:
0-25 mA per string or 0-50mA for one string only
Half range setting also available
Soft Start and Sink Current Slew Rate Control
Programmable Over-Current Limit through external
sense resistor
Programmable Output Voltage Protection through
external resistor divider
UVLO shutdown protection
DESCRIPTION
The LED BOOST is a current mode PWM boost converter that
provides power to one or two strings of white or colored LEDs as
used in LCD displays and keyboard backlighting. The converter
is fully compensated and requires no additional external
components for stable operation at a user-selectable switching
frequency of either 1MHz or 500kHz. The converter also
includes two regulated current sink drivers with internal FETs,
providing two outputs each containing the same number of LEDs
up to 25 mA each or a single (combined) output up to 50 mA
total. Safe operation is ensured by a user programmable over-
current limiting function and by output over-voltage protection.
REQUIREMENTS
1. Both LED strings must contain the same number of
LEDs with similar forward voltage drops for each LED.
2. 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.
3. 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).
L
VIN
R3
EA
PWM
LOGIC
1.2V
+
-
+
-
+
-
CSA
+
-
DRV
+
-
0.15V
OC
+
-
Vref
IDAC &
SINKS
-
Rc
Cc
SOFT START
& SHUTDOWN
CONTROL
OV
R1
R2
IN
T
E
R
N
A
L
IN
T
E
R
F
A
C
E
IDAC PROGRAM BUS
CLK
S
H
D
N
GATE
ISENSE
GND
VSENSE
SINK1
SINK2
VIN
Figure 21
– White LED Boost & Sink Driver Block Diagram
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