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ZHCSCD8C April 2014 – April 2019 LM46002

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机械数据 (封装 | 引脚)

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8.2 Typical Applications

The LM46002 only requires a few external components to convert from a wide range of supply voltage to output voltage. Figure 44 shows a basic schematic when BIAS is connected to V_OUT . This is recommended for V_OUT ≥ 3.3 V. For V_OUT < 3.3 V, connect BIAS to ground, as shown in Figure 45.

Figure 44. LM46002 Basic Schematic for
V_OUT ≥ 3.3 V, Tie BIAS to V_OUT

Figure 45. LM46002 Basic Schematic for
V_OUT < 3.3 V, t-Tie BIAS to Ground

The LM46002 also integrates a full list of optional features to aid system design requirements, such as precision enable, V_CC UVLO, programmable soft start, output voltage tracking, programmable switching frequency, clock synchronization, and power-good indication. Each application can select the features for a more comprehensive design. A schematic with all features utilized is shown in Figure 46.

Figure 46. LM46002 Schematic with All Features

The external components must fulfill the needs of the application, but also the stability criteria of the device control loop. The LM46002 is optimized to work within a range of external components. The inductance and capacitance of the LC output filter must be considered in conjunction, creating a double pole, responsible for the corner frequency of the converter. Table 2 can be used to simplify the output filter component selection.

Table 2. L, C_OUT and C_FF Typical Values

F_S (kHz)	L (µH)⁽¹⁾	C_OUT (µF) ⁽²⁾	C_FF (pF) ⁽³⁾⁽⁴⁾	R_T (kΩ)	R_FBB (kΩ) ⁽³⁾⁽⁴⁾
V_OUT = 1 V
200	8.2	560	none	200	100
500	3.3	470	none	80.6 or open	100
1000	1.8	220	none	39.2	100
2200	0.68	150	none	17.8	100
V_OUT = 3.3 V
200	27	250	56	200	432
500	10	150	47	80.6 or open	432
1000	4.7	100	33	39.2	432
2200	2.2	47	22	17.8	432
V_OUT = 5 V
200	33	200	68	200	249
500	15	100	47	80.6 or open	249
1000	6.8	47	47	39.2	249
2200	3.3	33	33	17.8	249
V_OUT = 12 V
200	56	68	see note ⁽⁵⁾	200	90.9
500	22	47	68	80.6 or open	90.9
1000	10	33	47	39.2	90.9
V_OUT = 24 V
200	180	68	see note ⁽⁵⁾	200	43.2
500	47	47	see note ⁽⁵⁾	80.6 or open	43.2
1000	22	33	see note ⁽⁵⁾	39.2	43.2

(1) Inductor values are calculated based on typical V_IN = 24 V.

(2) All the C_OUT values are after derating. Add more when using ceramics.

(3) R_FBT = 0 Ω for V_OUT = 1 V. R_FBT = 1 MΩ for all other V_OUT settings.

(4) For designs with R_FBT other than 1 MΩ, adjust C_FF so that (C_FF × R_FBT) is unchanged, and adjust R_FBB so that (R_FBT / R_FBB) is unchanged.

(5) High ESR C_OUT provides enough phase boost, and C_FF is not needed.