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Description' E5 ^* b# E, M( F' B1 X
The Z CC2139 series is a CMOS step-up 4 B3 U9 ~5 g2 \7 n8 ^% y4 P# N% Y
switching regulator which mainly consists of a , U$ C" H# k2 E) @* Z: S
reference voltage source, an oscillation circuit, 0 m' s! M/ b6 ]; i- A
an error amplifier, a phase compensation circuit,
! e" ~9 |6 x' O+ Ha PWM/PFM switching control circuit. With an
% U7 C4 d$ j" P- {external low-ON-resistance Nch Power MOS, $ O* d/ b8 d P, R2 R* h. l0 p
this product is applicable to applications ' B& g- D" _6 x6 E
requiring high efficiency and high output current.
( g3 b/ m# @8 d" p; o0 ~The Z CC 2139 series switches its operation to the
. `" S6 m2 n4 D: OPFM control circuit whose duty ratio is 15 % with
- E/ }/ K( e% b3 Y6 @! S0 ^to the PWM/PFM switching control circuit under
5 H, B, f) w9 k1 }" x! }6 w9 p% ya light load and to prevent decline in the
# t! T3 v! G9 t/ p! l" w/ cefficiency by IC operation current. 2 c- B5 L) P7 J
Feature
) x6 H2 E ^. q3 l1 M2 N- s* h Low voltage operation: Start-up is guaranteed 3 _: K P" X) [ d
from 0.9 V(IOUT =1 mA )
# {' }* }* w) {2 u Duty ratio: Built-in PWM/PFM switching control
, E6 o. F. v0 {& wcircuit 15 to 78 % . * j) s; k& z7 ?+ O' `; Q
oscillator frequency：1.0MHz! u" Y4 [" J' M. w/ H! d
External parts: coil, diode, capacitor, and
2 {! ?! s- x- z2 n3 Utransistor+ Z; L @1 l* z4 G; h9 n8 K/ D
Output voltage range: 1.5V ~6.5 V s2 _7 s, e u2 u6 O- {: E
Output voltage accuracy：±2% 6 \- [5 \( O7 t: l: j2 o, c
Soft start function: 2 mS.
. w9 W X$ O" H0 r; [ PACKAGE：SOT23-56 y( _$ [+ l$ X3 R; M
& c! E/ R6 ~ P! m ~/ w2 n/ c! m2 M
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发表于 2021-12-30 17:57
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