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PDF SSL3252 Data sheet ( Hoja de datos )
| Número de pieza | SSL3252 | |
| Descripción | Photo flash LED driver | |
| Fabricantes | NXP Semiconductors | |
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SSL3252
Photo flash LED driver
Rev. 1 — 7 July 2011
Product data sheet
1. General description
The SSL3252 is a photo flash LED driver designed for battery operated mobile devices
such as mobile phones and PDAs. The boost converter delivers high performance and
drives a single or dual high brightness LED at up to 500 mA with over 85 % efficiency. The
driver can be programmed to operate in Flash mode, Torch mode, Assist light mode, or
Indicator mode.
The small silicon size and the high internal switching frequency of 2 MHz minimize the
size of the application and make the SSL3252 very suitable for mobile phones where
space is limited, and only requiring three external components. System protection has
been a very important part of the SSL3252 design, so a time-out function can be
programmed to prevent overstressing the LED, and the driver itself is protected from
overheating.
2. Features and benefits
High power single or dual LED output driving up to 500 mA flash current
Separate indicator LED output of 2.5 mA to 10 mA
High side current source for main and indicator LEDs
Output voltage of up to 8.85 V
Wide input voltage ranging from 2.5 V to 5.5 V
High efficiency of over 85 % at optimum output current
Switching frequency of 2 MHz
Flash mode, Assist light mode, Torch mode and Indicator mode are supported
Internally timed flash operation up to 850 ms
I2C-bus, programmable up to 400 kHz
Strobe signal to avoid I2C latency for the flash
Direct enable signals for stand-alone operation
Forward voltage sensing to allow single/dual LED detection
Soft start/soft stop
Integrated protection circuits for enhanced system reliability:
Internal time-out
OverTemperature Protection (OTP)
UnderVoltage LockOut (UVLO)
OverVoltage Protection (OVP)
Short-circuit protection
Inductor peak current limit and broken coil detection
Low device shut-down current of less than 1 A
Small WLCSP12 package with 500 m bump pitch
1 page  
NXP Semiconductors
SSL3252
Photo flash LED driver
7.2.1 Using the direct enable control
When the Direct enable mode is used, the device can be switched to the various
operational modes using the TORCH, EN1 and EN2 control signals. The definitions of
these control signals are given in Table 4. The EN1 and EN2 functions of the SCL/EN1
and SDA/EN2 pins have a higher priority than the pin TORCH. Figure 3 shows all the
possible transitions between the various interface modes.
The device is in Shut-down mode when all control pins (IF_SEL, EN1, EN2, TORCH) are
LOW.
Shut-down
mode
Indicator
mode
Torch
mode
Flash
mode
Fig 3. Direct enable mode transitions
Assist light
mode
014aaa303
Table 4. Direct enable logic definition
IF_SEL SCL/ SDA/ TORCH Mode
pin EN1 EN2 pin
pin pin
0 0 0 0 Shut-down
0 0 0 1 Torch
0 0 1 X[1] Assist light
0 1 0 X[1] Indicator
0 1 1 X[1] Flash
Output states
Outputs disabled; shut-down current less than
1 A
Fixed value; 40 mA dual LEDs; 80 mA single LED
Fixed value; 40 mA dual LEDs; 80 mA single LED
Fixed value 2.5 mA
Fixed value; 320 mA dual LEDs;
500 mA single LED
[1] X = Don’t care.
SSL3252
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 7 July 2011
© NXP B.V. 2011. All rights reserved.
5 of 30
5 Page 
NXP Semiconductors
SSL3252
Photo flash LED driver
ILED (mA)
500
480
(2)
440
(1)
(3)
400
360
(4)
320
280
240
200
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
014aaa308
register
value
(1) I2C level for one LED.
(2) Direct enable default level for one LED.
(3) I2C maximum level for two LEDs.
(4) Direct enable default level for two LEDs.
Fig 10. Flash mode LED current levels
7.3.7 Indicator
The indicator LED is connected between the dedicated indicator LED current output pin
(I_IND) and GND. Internally, a linear current source controls the indicator LED current to
the required current level.
In I2C interface mode, the indicator LED current can be set between 2.5 mA and 10 mA by
bits D[7:6] of the indicator/timer register.
When using the Direct enable mode, the indicator current is set to a default level of
2.5 mA.
Figure 11 shows the LED current levels for the indicator in both the I2C and the Direct
enable use case.
SSL3252
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 7 July 2011
© NXP B.V. 2011. All rights reserved.
11 of 30
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SSL3252.PDF ] | |
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