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UCC39422PWR

更新时间： 2024-11-23 23:39:07
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32页 560K
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UCC39422PWR 数据手册

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SLUS246B – OCTOBER 1999 – REVISED APRIL 2000  
D
Operation Down to an Input  
Voltage of 1.8 V  
simplified schematic block diagram and  
application circuit  
D
D
High Efficiency Boost, SEPIC or  
Flyback (Buck-Boost) Topologies  
1.8 V(MIN)  
+
+
Drives External FETs for  
High-Current Applications  
VPUMP  
VIN  
2 CELL  
ALKALINE/  
NiCd OR  
1 LI–ION  
7
9
1.24 V  
VREF  
D
Up to 2-MHz Oscillator  
CP  
8
3
D
Synchronizable Fixed Frequency  
Operation  
SYNC/SD  
RT  
CHARGE  
PUMP  
13  
14  
VOUT  
PWM  
OSC  
D
D
High-Efficiency Low-Power Mode  
RSEN  
RECT  
2
VOUT  
VPUMP  
High-Efficiency at Very Low-Power  
with Programmable Variable  
Frequency Mode  
4
RSEL  
ANTI–  
CROSS  
COND.  
19  
6
D
D
D
D
D
D
Pulse-by-Pulse Current Limit  
VGD  
CHRG  
5-µA Supply Current in Shutdown  
150-µA Supply Current in Sleep  
Mode  
PWM CIRCUITRY  
CURRENT LIMIT  
ISENSE  
PGND  
12  
5
+
X10  
Selectable NMOS or PMOS  
Rectification  
50 mV TYP  
LOW POWER  
MODE  
1.24 V  
ERROR  
AMP  
Built-In Power-On Reset  
(UCC39422 Only)  
SLOPE  
+
COMPENSATION  
FB  
17  
18  
16  
PFM MODE  
CONTROL  
Built-In Low-Voltage Detect  
(UCC39422 Only)  
COMP  
PFM  
GND  
15  
+
description  
1.22V  
The UCC39421 family of synchronous  
RESET  
UCC39422  
ONLY  
1
PWM controllers is optimized to operate  
from dual alkaline/NiCd cells or a single  
Lithium-Ion (Li-Ion) cell, and convert to  
adjustable output voltages from 2.5 V to  
8 V. For applications where the input  
voltage does not exceed the output, a  
standard boost configuration is used.  
200 mS  
RESET/  
POR  
+
1.18 V  
RSADJ  
VDET  
LOWBAT  
20  
11  
10  
+
1.24 V  
UDG–98122  
For other applications where the input voltage can swing above and below the output, a 1:1 coupled inductor  
(Flyback or SEPIC) is used in place of the single inductor. Fixed frequency operation can be programmed, or  
synchronized to an external clock source. In applications where (at light loads) variable frequency mode is  
acceptable, the IC can be programmed to automatically enter PFM (pulse frequency modulation) mode for an  
additional efficiency benefit.  
Synchronous rectification provides excellent efficiency at high power levels, where N- or P- type MOSFETs can  
be used. At lower power levels (between 10% and 20% of full load) where fixed frequency operation is required,  
low power mode is entered. This mode optimizes efficiency by cutting back on the gate drive of the charging  
FET. At very low power levels, the IC enters a variable frequency mode (PFM). PFM can be disabled by the user.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 2000, Texas Instruments Incorporated  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
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