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Description9 ^: s" i$ O, c; R. R
The Z CC2139 series is a CMOS step-up , C5 z9 g; x w
switching regulator which mainly consists of a & _; S6 K" B% X3 i4 F% {
reference voltage source, an oscillation circuit, 9 @8 q5 y* F( J* U( j& a
an error amplifier, a phase compensation circuit,
. F" Y- ~) |! R) fa PWM/PFM switching control circuit. With an 4 ?7 y/ \- h- @; @% Q% ]# ^
external low-ON-resistance Nch Power MOS, : ^" t2 ?9 f! u+ N) Z
this product is applicable to applications / U8 y1 L5 B0 ?; q3 V
requiring high efficiency and high output current.
. V$ M' w c! [: g5 U8 a$ t2 Z* hThe Z CC 2139 series switches its operation to the
9 ~; L, x& k+ z6 b0 R) h' yPFM control circuit whose duty ratio is 15 % with % I c/ U. q4 ] ?) G8 R5 s
to the PWM/PFM switching control circuit under 6 a1 D, X1 z2 I9 h
a light load and to prevent decline in the , c. `, h! w! l0 B x* a& I1 H
efficiency by IC operation current. 8 b! B: Y1 s7 n; s% r1 C$ ?8 u
Feature
' i) v: d% G$ F( n: ^+ Y Low voltage operation: Start-up is guaranteed 5 N$ q8 m0 Y; R O- u8 |9 J8 t5 P
from 0.9 V(IOUT =1 mA ); Z' `+ K- I, j, J( G6 O/ E b4 z: }: F
Duty ratio: Built-in PWM/PFM switching control
$ N$ E8 ~4 j' B2 |circuit 15 to 78 % .
( ~8 }" n' t$ w! f oscillator frequency：1.0MHz4 ~" [7 V+ M) B/ g$ H( }$ b0 H
External parts: coil, diode, capacitor, and * G6 @" ]) C- {7 x7 K; o; N% \: O
transistor
7 ?$ v* A8 h. Y/ w+ C Output voltage range: 1.5V ~6.5 V
- B. r8 [" ]% _5 M; ?! e Output voltage accuracy：±2% ( N |9 n$ f9 V9 u& v. J
Soft start function: 2 mS.
l2 S5 l3 R8 [! _2 H PACKAGE：SOT23-5* K L; _* B! o- b& i- D
+ {$ Q4 J5 x" a4 |# f9 m
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发表于 2021-12-30 17:57
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