ZCC2139替代ME2139

Siweidianzi

Description
4 _( `" _: L, r* X; ^7 aThe Z CC2139 series is a CMOS step-up
3 X% z% W7 m4 kswitching regulator which mainly consists of a
+ f" \& `1 p0 C4 r: hreference voltage source, an oscillation circuit,
an error amplifier, a phase compensation circuit,
a PWM/PFM switching control circuit. With an
% ?0 r* C2 F( S' M" r# Kexternal low-ON-resistance Nch Power MOS,
4 A' S- Y5 H8 n3 |; f& A0 t( Hthis product is applicable to applications
requiring high efficiency and high output current.
The Z CC 2139 series switches its operation to the
PFM control circuit whose duty ratio is 15 % with
! @+ o$ L' ?0 d5 P8 r# S. U0 ]4 pto the PWM/PFM switching control circuit under
a light load and to prevent decline in the
efficiency by IC operation current.
, r1 j: i  N3 aFeature
4 o: f6 s/ I3 S3 u& r# F2 @ Low voltage operation: Start-up is guaranteed
2 b  ~$ F; `* N: {  T5 tfrom 0.9 V(IOUT =1 mA )
 Duty ratio: Built-in PWM/PFM switching control
3 N$ q6 i; G7 h1 a/ r) Q$ T' Vcircuit 15 to 78 % .
6 J$ B. y& I; [. \; v2 k, L: v) j oscillator frequency：1.0MHz
9 L& k. m) Q5 ^ External parts: coil, diode, capacitor, and
  I0 k' E& |! ]' b; I! Dtransistor
( T# d( b" D3 o5 m2 ~# \4 a Output voltage range: 1.5V ~6.5 V
7 a0 `# V. ]8 N Output voltage accuracy：±2%
( K/ q# q2 n$ r  _6 y3 F Soft start function: 2 mS.
* G" i* u6 K/ W: V PACKAGE：SOT23-5
0 D5 M: e* }0 z) ^& I* n
  }$ z& p. u5 c
6 N( n5 p/ h( W/ L" E