Datasheet > AAT2556

AAT2556

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		转换器电池便携式
页数	文件大小	规格书
29页	745K
描述
Battery Charger and Step-Down Converter for Portable Applications

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AAT2556 数据手册

AAT2556

Battery Charger and Step-Down

Converter for Portable Applications

Input Capacitor

Input Ripple V_PP= 25mV

C_IN=

= 1.38µF; use 4.7µF

⎛

⎝

V_PP

I_O

⎞

⎛

⎝

25mV

0.2A

⎞

- ESR

F_S

- 5mΩ

1.5MHz

⎠

I_O

I_RMS

= 0.1Arms

P = esr

I_RMS²= 5mΩ

(0.1A)²= 0.05mW

AAT2556 Losses

I_O²· (R_DSON(H)· V_O+ R_DSON(L)· [V_IN-V_O

])

P_TOTAL

V_IN

+ (t_sw· F_S· I_O+ I_Q) · V_IN

0.2²· (0.7

1.8V + 0.7Ω

4.2V

· [4.2V - 1.8V])

+ (5ns · 1.5MHz · 0.2A + 30µA) · 4.2V = 34.5mW

T_J(MAX)= T_AMB+ Θ_JA· P_LOSS= 85°C + (50°C/W) · 34.5mW = 86.7°C

2556.2006.05.1.0

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