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IS31BL3233A Schematic ( PDF Datasheet ) - ISSI

Teilenummer IS31BL3233A
Beschreibung 1.5A FLASH/TORCH LED DRIVER
Hersteller ISSI
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Gesamt 13 Seiten
IS31BL3233A Datasheet, Funktion
IS31BL3233A
2MHz, 1.5A FLASH/TORCH LED DRIVER
Preliminary Information
September 2014
GENERAL DESCRIPTION
The IS31BL3233A is the ideal power solution for
high-power flash LEDs used with cell phone camera
modules or digital still cameras. It is a highly integrated
step up DC-DC converter with very high switching
frequency, fixed at 2MHz, providing a very small total
solution for portable photo flash. The IS31BL3233A has
separate Flash Mode and Torch Mode enable pins for
maximum flexibility. The Flash Mode and Torch Mode
LED current is programmed by external resistors
respectively, making the flash LED solution simple to
control. If both enable pins are at logic high, the LED
current will be programmed by the Torch Mode setting
resistor. The two LED output sinks can be shorted
together externally for higher power single flash LEDs,
up to 1.5A continuous LED current. Thermal regulation
is integrated in Flash Mode to limit the IC’s temperature
and continuously provide the maximum allowed output
current.
Various protection features are built into the
IS31BL3233A, including cycle-by-cycle input current
limit protection, output over-voltage protection, LED
fault (open or short) protection and thermal shutdown
protection. The IS31BL3233A is available in a RoHS
compliant DFN-14 (2mm × 3mm) package.
FEATURES
Input voltage range: 2.7V~5.5V
Dual flash LED outputs
Drive up to total 1.5A or 0.75A per channel
1s time out in Flash Mode to protect LED
High efficiency up to 93% (1A, Flash Mode)
2MHz step-up converter
Independent Flash Mode enable and Torch Mode
enable pins
Torch Mode dimming via PWM control
Integrated thermal regulation control
LED open/short protection
Over-voltage protection
Cycle-by-cycle inductor current limit
Pb-free package: DFN-14 (2mm×3mm)
-40C° ~ +85C° temperature range
APPLICATIONS
Mobile phones
Smart phones and PDAs
Digital still cameras
TYPICAL APPLICATION CIRCUIT
Figure 1 Typical Application Circuit (Torch Mode current is100mA and Flash Mode current is 500mA)
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0C, 09/11/2014
1






IS31BL3233A Datasheet, Funktion
IS31BL3233A
ELECTRICAL CHARACTERISTICS (CONTINUE)
The following specifications apply for VCC = 3.6V, TA = 25°C, unless otherwise noted.
Symbol
Description
Condition
Min.
Typ.
Max. Units
Control
VIL
VIH
RPD_F
RPD_M
TOTP
THYS
ENF, ENM pin logic low threshold
ENF, ENM pin logic high threshold
ENF Internal pull-down Resistance
ENM Internal pull-down Resistance
IC junction thermal shutdown threshold
IC junction thermal shutdown hysteresis
(Note 1)
(Note 1)
Note 1: Guarantee by design.
Note 2: The current matching between channels is defined as I OUT
I D1 I D2
I D1 I D2
.
0.4
1.4
300
300
150
20
V
V
k
k
°C
°C
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0C, 09/11/2014
6

6 Page









IS31BL3233A pdf, datenblatt
IS31BL3233A
CLASSIFICATION REFLOW PROFILES
Profile Feature
Preheat & Soak
Temperature min (Tsmin)
Temperature max (Tsmax)
Time (Tsmin to Tsmax) (ts)
Average ramp-up rate (Tsmax to Tp)
Liquidous temperature (TL)
Time at liquidous (tL)
Peak package body temperature (Tp)*
Time (tp)** within 5°C of the specified
classification temperature (Tc)
Average ramp-down rate (Tp to Tsmax)
Time 25°C to peak temperature
Pb-Free Assembly
150°C
200°C
60-120 seconds
3°C/second max.
217°C
60-150 seconds
Max 260°C
Max 30 seconds
6°C/second max.
8 minutes max.
Figure 12 Classification Profile
Integrated Silicon Solution, Inc. – www.issi.com
Rev. 0C, 09/11/2014
12

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