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PDF STCF07 Data sheet ( Hoja de datos )
| Número de pieza | STCF07 | |
| Descripción | High power buck-boost white LED driver | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STCF07
High power buck-boost white LED driver
Features
■ Buck-boost DC-DC converter
■ Drives one power LED up to 1 A in flash mode
■ Drives one power LED up to 800 mA in
continuous mode
■ LED temperature protection
■ Output current control
■ 1.8 MHz (typ.) fixed frequency PWM
■ Synchronous rectification
■ High efficiency across the total input voltage
range
■ Operational modes:
– Shutdown mode
– High current mode: up to 1 A
– Low current mode: from 20 mA
■ Adjustable current in both modes
■ Peak inductor limited to 2.3 A (typ.)
■ LED disconnected from the battery in
shutdown mode
■ NTC LED temperature protection
www.DataS■heeOt4vUe.crovmoltage protection: 5.3 V
■ Short-circuit protection
■ Overtemperature protection
■ ULVLO function
■ 1 µA max shutdown current
■ QFN16 (4 x 4 x 1 mm) 16 leads
Applications
QFN16 (4 x 4 mm)
Description
The STCF07 is a dedicated, size-optimized
solution for driving a power LED. The device is a
buck-boost converter which guarantees proper
LED current control over all possible battery
voltage and LED forward voltage conditions. The
output current control ensures good current
regulation over the forward voltage spread
characteristics of high-brightness LEDs.
The device includes various functions to protect
the chip and the power LEDs. These include soft-
start control as well as detection and protection of
chip overtemperature and shorted LEDs. An
optional external NTC is supported to protect the
LEDs against overheating. It is possible to
separately program the current intensity in HIGH
and LOW mode using the SEL pin. The device is
housed in a 16-lead QFN16 (4 x 4 mm) package
with a height less than 1 mm.
■ Camera flash for mobile phones
■ Power supply for high power LEDs
Table 1. Device summary
Order code
Package
Packaging
STCF07PNR
QFN16 (4 x 4 mm)
Tape and reel
November 2009
Doc ID 16757 Rev 1
1/26
www.st.com
26
1 page  
STCF07
2 Pin configuration
Figure 2. STCF07 pin connections (top view)
Pin configuration
Table 2. STCF07 pin description
Pin n°
Symbol
Description
1
8
2
3
4
5
6
www.DataSheet4U.c1o4m
13
7
16
9
10
11
12
15
Exposed pad
VLX2
RX
NTC
VOUT
FB1
FB2
FB2S
GND
CSEL
EN
FAULT
PVBAT
VBAT
VLX1A
VLX1B
PGND
PGND
Inductor VLX2 connection
RX resistor connection
NTC resistor connection
Output voltage
Feedback pin [ILED*(RHC+RLC)]
RTR bypass
Feedback pin [ILED*RHC]
Signal ground
Current selection
Enable
Diagnostic
Power supply voltage
Supply voltage
Inductor VLX1 connection
Inductor VLX1 connection
Power ground
To be connected to the PCB ground plane for optimal electrical and
thermal performance
Doc ID 16757 Rev 1
5/26
5 Page 
STCF07
7 Logic pin description
Logic pin description
7.1 CSEL pin
This input pin allows the setting of two different levels of current. When the voltage on this
pin is low, the internal multiplexer switches the feedback to the FB1 pin, which is the
dedicated feedback pin for low current operation. When the voltage on the CSEL pin is high,
the internal multiplexer switches the feedback to the FB2s pin, and enables the shorting
transistor connected between the FB1 and FB2 pins. The feedback voltage is sensed
directly on the sensing RHC by the connection of FB2s. This sensing pin is dedicated to high
current operation.
7.2 FAULT pin
When the STCF07 is in ON mode (EN is high), the device is able to detect disconnection or
failure of the LED. This information can be used by the system to signal that a problem has
occurred in the LEDs.
7.3 ENABLE pin
This pin functions as an enable input. No internal pull-up or pull-down is provided.
www.DataSheet4U.com
Doc ID 16757 Rev 1
11/26
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet STCF07.PDF ] | |
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