AL3157
Document overview
- Manufacturer or author: Diodes Incorporated
- PDF pages: 10
Technical content
Features
Dual-Mode 1x and 2x Charge Pump Up to 300mA Drive Capability 3-Channel for Backlight – 30mA/CH Channel for Flash/Light – 210mA VIN Range: 2.7V to 5.5V Two Simple PWM Dimming Control Inputs up to 50kHz 1.2MHz Constant Switching Frequency Built-in Thermal, Open-Circuit and VOUT Short Circuit Protection Soft Start for Reducing In-Rush Current IQ < 1µA in Shutdown Thermally-Enhanced U-DFN3030-12 Package: Available in “Green” Molding Compound (No Br, Sb) Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/
Applications
Smart touch phone LED backlighting PDA white LED backlighting Backlighting + torch light Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen - and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500p pm total Br + Cl) and <1000ppm antimony compounds. NOT RECOMMENDED FOR NEW DESIGN CONTACT US
Document number: DS35199 Rev. 2 - 3 2 of 10 www.diodes.com November 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AL3157 Typical Application Circuit Pin Descriptions Pin Name Pin Number Description EN2 1 Enable Pin 2: Controls outputs D2, D3 and D4 PGND 2 Charge Pump Switch Ground: Connect to GND CN 3 Negative Terminal of Flying Capacitor VIN 4 Input Power Supply. Decouple with a 2.2µF capacitor between this pin and ground. CP 5 Positive Terminal of Flying Capacitor VOUT 6 Charge Pump Output to Drive D1 to D4 Load Circuit. Decouple with a 2.2µF capacitor between this pin and ground. D4 7 Current Sink Input #4. Drive up to 30mA LED current. Connect to VOUT when unused. D3 8 Current Sink Input #3. Drive up to 30mA LED current. Connect to VOUT when unused. GND 9 Ground D2 10 Current Sink Input #2. Drive up to 30mA LED current. Connect to VOUT when unused. EN1 11 Enable Pin 1: Controls output D1 D1 12 Current Sink Input #1. Drive up to 210mA LED current. Connect to VOUT when unused. Exposed Pad EP Pad Exposed Pad (bottom). Connect to GND directly underneath the package. AL3157 VOUT D4EN2 EN1 EN2 EN1 2.2µF CIN VIN VIN 1µF CP CN PGND GND 2 9 2.2µF COUT Flash/ Light (EN1) Backlight (EN2) AL3157 VOUT D4EN2 EN1 EN2 EN1 2.2µF CIN VIN VIN 1µF CP CN PGND GND 2 9 2.2µF COUT Flash/ Light (EN1) Backlight (EN2)
Document number: DS35199 Rev. 2 - 3 3 of 10 www.diodes.com November 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AL3157 Functional Block Diagram SHORT CIRCUIT PROTECTION CN CP VIN GND CURRENT CONTROL CHARGE PUMP SWITCHES VOUT OVER VOLTAGE PROTECTION EN1 UNDER VOLTAGE LOCKOUT BANDGAP OSCILLATOR OVER TEMPERATURE PROTECTION EN2 DIGITAL CONTROL BLOCK Absolute Maximum Ratings (Note 4) Symbol Description Rating Unit ESD HBM Human Body Model ESD Protection 2 kV ESD MM Machine Model ESD Protection 200 V VIN Input Voltage -0.3 to 6 V VEN1, 2, 3 EN1, EN2, EN3 to GND Voltage -0.3 to VIN +0.3 V IOUT Maximum DC Output Current 300 mA TJ Operating Junction Temperature +125 °C TLEAD Maximum Soldering Temperature (at leads, 10 sec) +300 °C Note: 4. Stresses greater than those listed under Absolute Maximum Ratings can cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to Absolute Maximum Ratings for extended periods can affect device reliability. Recommended Operating Conditions Symbol Parameter Min Max Unit VIN Input Voltage 2.7 5.5 V VENL(1, 2) EN1, 2 Threshold Low 0 0.4 V VENH(1, 2) EN1, 2 Threshold High 1.4 VIN V TA Operating Ambient Temperature -40 +85 °C
Document number: DS35199 Rev. 2 - 3 4 of 10 www.diodes.com November 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AL3157 Electrical Characteristics (VIN = 4V, CIN = COUT = 2.2µF, C1 = 1µF; TA = +25°C, unless otherwise noted.) Symbol Parameter Test Conditions Min Typ. Max Unit IQ Quiescent Current 1x Mode, 3.0 ≤ VIN ≤ 5.5, Active No Load Current — 0.3 0.6 mA 2x Mode, 3.0 ≤ VIN ≤ 5.5, Active No Load Current — 2 5 ISHDN Shutdown Current EN1, EN2 = 0 — — 1 µA ID2-4 Backlight LED Drive Sink Current Accuracy (Note 5) IDX = 30mA 28.5 30 31.5 mA ID1 Flash/Light LED Drive Sink Current Accuracy (Note 5) ID1 = 210mA 199.5 210 220.5 mA ID-Match Current Matching Between Any Two Backlight LED Drive Current Sink Outputs (Note 6) VF: D2:D4 = 4V — 1 2 % ROUT Charge Pump VOUT Open Loop Resistance 1x Mode — 0.5 — Ω 2x Mode — 4.5 — VTH-Dx 1x to 2x Transition Threshold at D2, D3 and D4 Pins ID = 30mA — 150 — mV VTH-D1 1x to 2x Transition Threshold at D1 Pin ID1 = 210mA — 150 — mV VHS Mode Transition Threshold — — — 500 mV tSS Soft-Start Time — — 100 — µs fSW Switching Frequency — — 1.2 — MHz tEN1, 2 EN1, 2 Off Timeout — — — 20 ms UVLO VIN Under-Voltage Lockout — 1.8 2 2.2 V IEN1, 2 EN1, 2 Input Leakage — -1 — 1 µA TSHDN Thermal Shutdown Protection — — +160 — °C THYS Thermal Shutdown Hysteresis — — +10 — °C θJA Thermal Resistance Junction-to-Ambient U-DFN3030-12 (Note 7) — 55.29 — °C/W Notes: 5. Determined by the mean of channels 2, 3 and 4 currents, EG (ID2 + ID3 + ID4)/3. 6. Determined by the maximum sink current (MAX), the minimum sink current (MIN), and the average sink current (AVG). Two matching numbers are calculated as (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is as the matching data. 7. Device mounted on FR-4 substrate, 2" x 2", 2oz copper, double-sided PC board.
Document number: DS35199 Rev. 2 - 3 5 of 10 www.diodes.com November 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AL3157 Typical Performance Characteristics Turn-On in 1x Mode 100µs/div Turn-On in 2x Mode 100µs/div Turn-Off in 1x Mode 200ms/div Turn-Off in 2x Mode 200ms/div Load Characteristics in 2x Mode 500ns/div PWM Dimming Control (Duty Cycle=50%) 10µs/div Vout 2V/div EN1,2 2V/div VIN=4.2V TA=25°C Iin 300mA/div Vout 2V/div EN1,2 2V/div Iin 300mA/div VIN=3.0V TA=25°C Vout 2V/div EN1,2 2V/div Iin 300mA/div VIN=3.0V TA=25°C Iin 300mA/div VIN=4.2V TA=25°C EN1,2 2V/div Vout 2V/div VIN=3.0V TA=25°C Vin 100mVAC/div Vout 100mVAC/div Iin 100mAAC/div Iin 300mA/div VIN=4V Freq=20kHz Duty Cycle=50% TA=25°C EN 2V/div Id1 200mA/div
Document number: DS35199 Rev. 2 - 3 6 of 10 www.diodes.com November 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AL3157 Typical Performance Characteristics (continued)
Document number: DS35199 Rev. 2 - 3 7 of 10 www.diodes.com November 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AL3157 Functional Description The AL3157 is a dual-mode high efficiency charge pump ( 1x and 2x) device, driving 3 -channel standard backlight LEDs and one high -current Flash/Torch LED, intended for white LED backlight applications. An internal comparator circuit compares the voltage at each constant current sink input against a reference voltage. To ensure maximum power efficiency, the most appropriate switching mode (1x and 2x) is automatically selected. The APL3157 requires only three external components: one 1µF ceramic flying capacitor (C1) for the charge pump, one 2.2µF ceramic input capacitor (CIN), and one 2.2µF ceramic charge pump output capacitor (COUT). Each output channel of the A L3157 can drive three individual LEDs with a maximum current of 30mA per channel and a Flash/Torch LED with a maximum current of 210mA. These can be paralleled to give a total output current of 300mA. LED Control Table Disabled Current Sinks Unused current channels must be disabled by connecting the sinks to VOUT with only a small sense current flowing through the disabled channel. Soft-Start Soft-start is incorporated to prevent excessive in-rush current during power-up, mode switching, and transitioning out of stand-by mode. Short-Circuit Protection Short-circuit protection function is incorporated to prevent excessive load current when either flying cap terminals or output pin electrically tied to a very lower voltage or ground. Over-Voltage Protection Over-voltage protection function is incorporated to limit the output voltage under a safe value to avoid on-chip device breakdown. Under-Voltage Lockout Under-voltage lockout feature disables the device when the input voltage drops below UVLO threshold. Thermal Auto Shutdown When the die temperature exceeds the thermal limit, the device will be disabled and enter stand-by mode. The operation resumes whenever the die cools off sufficiently. PWM Dimming Control The AL3157 provides simple PWM dimming control through ENx pins, and the current is adjusted by the duty cycle of the signal applied on ENx pin. The recommended PWM frequency is from 200Hz to 50kHz depending on applications. EN1 EN2 D1 D2, D3, D4 0 0 OFF OFF 0 1 OFF ON 1 0 ON OFF 1 1 ON ON
Document number: DS35199 Rev. 2 - 3 8 of 10 www.diodes.com November 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AL3157
Ordering Information
Part Number Part Number Suffix Package Code Package (Note 8) Packing Qty. Carrier AL3157F-7 -7 F U-DFN3030-12 3000 7” Tape and Reel Marking Information U-DFN3030-12 Y : Year : 0 to 9 (ex: 2 = 2022) W : Week : A to Z : week 1 to 26; ( Top View ) X : A to Z : Green Y W X XX XX : B7 : AL3157 z represents week 52 and 53 a to z : week 27 to 52; Part Number Package Identification Code AL3157F-7 U-DFN3030-12 B7 AL3157 X - 7 Package F : U-DFN3030-12 Packing 7 : 7” Tape & Reel AL3157 X - 7 Package F : U-DFN3030-12 Packing 7 : 7” Tape & Reel
Document number: DS35199 Rev. 2 - 3 9 of 10 www.diodes.com November 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AL3157
Package Information
Please see http://www.diodes.com/package-outlines.html for the latest version. 2.3 / 2.5 2.9 / 3.1 0.10 M C A B 0.25/0.55 R0.3 B 0.25 Bottom View 2.9 / 3.1 A A 0/0.05 0.57/0.63 0.15max.C
0.25 B2x-
0.08 C 0.10 C Seating plane Tape Orientation (Note 9)
Document number: DS35199 Rev. 2 - 3 10 of 10 www.diodes.com November 2022 © 2022 Copyright Diodes Incorporated. All Rights Reserved. AL3157 IMPORTANT NOTICE 1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes ’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diodes’ products. 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