Datasheet MAX25610A, MAX25610B (Maxim) - 9
| Manufacturer | Maxim |
| Description | Synchronous Buck and Buck Boost LED Driver / DC-DC Converter |
| Pages / Page | 24 / 9 — Pin Description. PIN. NAME. FUNCTION. REF. TSSOP. TQFN. SUPPLY |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
Pin Description. PIN. NAME. FUNCTION. REF. TSSOP. TQFN. SUPPLY
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MAX25610A/MAX25610B Synchronous Buck and Buck-Boost LED Driver/DC-DC Converter
Pin Description PIN NAME FUNCTION REF TSSOP TQFN SUPPLY
1 15 AGND Analog Ground. Connect control loop compensation and other small-signal components to this ground. Connect to PGND at a single point. 2 16 V Main 5V Internal LDO. Bypass this pin to AGND with a minimum 0.1μF ceram- CC ic capacitor. Bypass this pin to PGND with a minimum 1μF ceramic capacitor. 3 1 PGND Power Ground Reference Node. PGND is connected internally to the source terminal of internal low-side power MOSFET. Input Positive Supply. INP is internally connected to the drain terminal of high- 4 2 INP side power FET. Bypass this pin to PGND with a ceramic capacitor close to the pin. 5, 6 3, 4 LX Switching Node. Connect the output inductor to these pins with wide traces. Place the inductor as close as possible to the pins. 7 5 BST High-Side Power Supply for High-Side Gate Drive. Place a 0.1μF ceramic capacitor from this pin to LX. Active-Low, Open-Drain Fault Indicator Output. Connect through an external 8 6 FLT pullup resistor to an external supply with the desired level. This pin can be left open if it is not used. See the [[Fault Handling]] section for more information. 9 7 V Auxiliary 5V Regulator. Bypass this pin to INN with a minimum 1μF ceramic EE capacitor. 10 8 INN Ground Side of Input Supply. Connect this pin to PGND when used as a buck converter. Dimming Control Input. Connect PWMDIM to an external PWM signal for PWM dimming. For analog voltage-controlled PWM dimming, connect PWMDIM to a resistive voltage-divider from VEE to INN. The duty cycle is 11 9 PWMDIM (V given by D = PWMDIM − 0.205) . Connect PWMDIM to INN to turn off the 2.8 LEDs. Connect PWMDIM to VEE for 100% duty cycle. Frequency Programming for PWM Dimming Function. Connect PWMFRQ to the junction of an RC from VCC to AGND. Dimming frequency is given by 12 10 PWMFRQ f V DIM = 3.33e−3 R . Do not connect any other component or device CC PWMFRQCPWMFRQ to this pin. www.maximintegrated.com Maxim Integrated │ 9
Pin Description PIN NAME FUNCTION REF TSSOP TQFN SUPPLY
1 15 AGND Analog Ground. Connect control loop compensation and other small-signal components to this ground. Connect to PGND at a single point. 2 16 V Main 5V Internal LDO. Bypass this pin to AGND with a minimum 0.1μF ceram- CC ic capacitor. Bypass this pin to PGND with a minimum 1μF ceramic capacitor. 3 1 PGND Power Ground Reference Node. PGND is connected internally to the source terminal of internal low-side power MOSFET. Input Positive Supply. INP is internally connected to the drain terminal of high- 4 2 INP side power FET. Bypass this pin to PGND with a ceramic capacitor close to the pin. 5, 6 3, 4 LX Switching Node. Connect the output inductor to these pins with wide traces. Place the inductor as close as possible to the pins. 7 5 BST High-Side Power Supply for High-Side Gate Drive. Place a 0.1μF ceramic capacitor from this pin to LX. Active-Low, Open-Drain Fault Indicator Output. Connect through an external 8 6 FLT pullup resistor to an external supply with the desired level. This pin can be left open if it is not used. See the [[Fault Handling]] section for more information. 9 7 V Auxiliary 5V Regulator. Bypass this pin to INN with a minimum 1μF ceramic EE capacitor. 10 8 INN Ground Side of Input Supply. Connect this pin to PGND when used as a buck converter. Dimming Control Input. Connect PWMDIM to an external PWM signal for PWM dimming. For analog voltage-controlled PWM dimming, connect PWMDIM to a resistive voltage-divider from VEE to INN. The duty cycle is 11 9 PWMDIM (V given by D = PWMDIM − 0.205) . Connect PWMDIM to INN to turn off the 2.8 LEDs. Connect PWMDIM to VEE for 100% duty cycle. Frequency Programming for PWM Dimming Function. Connect PWMFRQ to the junction of an RC from VCC to AGND. Dimming frequency is given by 12 10 PWMFRQ f V DIM = 3.33e−3 R . Do not connect any other component or device CC PWMFRQCPWMFRQ to this pin. www.maximintegrated.com Maxim Integrated │ 9
