95 lines
2.7 KiB
Plaintext
95 lines
2.7 KiB
Plaintext
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Linear Technology LTC3676 8-output regulators
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Required properties:
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- compatible: "lltc,ltc3676"
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- reg: I2C slave address
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Required child node:
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- regulators: Contains eight regulator child nodes sw1, sw2, sw3, sw4,
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ldo1, ldo2, ldo3, and ldo4, specifying the initialization data as
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documented in Documentation/devicetree/bindings/regulator/regulator.txt.
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Each regulator is defined using the standard binding for regulators. The
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nodes for sw1, sw2, sw3, sw4, ldo1, ldo2 and ldo4 additionally need to specify
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the resistor values of their external feedback voltage dividers:
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Required properties (not on ldo3):
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- lltc,fb-voltage-divider: An array of two integers containing the resistor
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values R1 and R2 of the feedback voltage divider in ohms.
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Regulators sw1, sw2, sw3, sw4 can regulate the feedback reference from:
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412.5mV to 800mV in 12.5 mV steps. The output voltage thus ranges between
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0.4125 * (1 + R1/R2) V and 0.8 * (1 + R1/R2) V.
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Regulators ldo1, ldo2, and ldo4 have a fixed 0.725 V reference and thus output
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0.725 * (1 + R1/R2) V. The ldo3 regulator is fixed to 1.8 V. The ldo1 standby
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regulator can not be disabled and thus should have the regulator-always-on
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property set.
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Example:
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ltc3676: pmic@3c {
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compatible = "lltc,ltc3676";
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reg = <0x3c>;
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regulators {
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sw1_reg: sw1 {
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regulator-min-microvolt = <674400>;
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regulator-max-microvolt = <1308000>;
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lltc,fb-voltage-divider = <127000 200000>;
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regulator-ramp-delay = <7000>;
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regulator-boot-on;
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regulator-always-on;
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};
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sw2_reg: sw2 {
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regulator-min-microvolt = <1033310>;
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regulator-max-microvolt = <200400>;
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lltc,fb-voltage-divider = <301000 200000>;
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regulator-ramp-delay = <7000>;
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regulator-boot-on;
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regulator-always-on;
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};
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sw3_reg: sw3 {
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regulator-min-microvolt = <674400>;
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regulator-max-microvolt = <130800>;
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lltc,fb-voltage-divider = <127000 200000>;
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regulator-ramp-delay = <7000>;
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regulator-boot-on;
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regulator-always-on;
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};
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sw4_reg: sw4 {
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regulator-min-microvolt = <868310>;
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regulator-max-microvolt = <168400>;
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lltc,fb-voltage-divider = <221000 200000>;
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regulator-ramp-delay = <7000>;
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regulator-boot-on;
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regulator-always-on;
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};
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ldo2_reg: ldo2 {
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regulator-min-microvolt = <2490375>;
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regulator-max-microvolt = <2490375>;
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lltc,fb-voltage-divider = <487000 200000>;
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regulator-boot-on;
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regulator-always-on;
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};
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ldo3_reg: ldo3 {
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regulator-min-microvolt = <1800000>;
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regulator-max-microvolt = <1800000>;
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regulator-boot-on;
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};
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ldo4_reg: ldo4 {
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regulator-min-microvolt = <3023250>;
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regulator-max-microvolt = <3023250>;
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lltc,fb-voltage-divider = <634000 200000>;
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regulator-boot-on;
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regulator-always-on;
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};
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};
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};
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