ltc1772b Linear Technology Corporation, ltc1772b Datasheet - Page 12

• Manufacturer Part Number: ltc1772b
• Description: Constant Frequency Current Mode Step-down Dc/dc Controller In Sot-23
• Manufacturer: Linear Technology Corporation

RELATED PARTS
LTC1772B
TYPICAL APPLICATIONS
PACKAGE
PART NUMBER
LT1375/LT1376
LTC1622
LTC1624
LTC1625
LTC1627
LTC1649
LTC1702
LTC1735
LTC1771
LTC1772
LTC1773
LTC1872
No R
12
SENSE
is a trademark of Linear Technology Corporation.
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] FAX: [phone] www.linear-tech.com
DESCRIPTION
1.5A, 500kHz Step-Down Switching Regulators
Low Input Voltage Current Mode Step-Down DC/DC Controller
High Efficiency SO-8 N-Channel Switching Regulator Controller
No R
Low Voltage, Monolithic Synchronous Step-Down Regulator
3.3V Input Synchronous Step-Down Controller
550kHz, 2 Phase, Dual Synchronous Controller
Single, High Efficiency, Low Noise Synchronous Switching Controller
Ultra-Low Supply Current Step-Down DC/DC Controller
Constant Frequency Current Mode Step-Down
DC/DC Controller in SOT-23
95% Efficient Synchronous Step-Down Controller
SOT-23 Step-Up Controller
DESCRIPTION
SENSE
(0.014 – 0.022)
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DIMENSIONS ARE INCLUSIVE OF PLATING
3. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
4. MOLD FLASH SHALL NOT EXCEED 0.254mm
5. PACKAGE EIAJ REFERENCE IS SC-74A (EIAJ)
0.35 – 0.55
TM
Synchronous Step-Down Regulator
C1: AVXTPSE476M016R0047
C2: AVXTPSE107M010R0100
D1: IR10BQ015
R4
10k
C3
220pF
(0.059 – 0.069)
(0.110 – 0.118)
U
1.50 – 1.75
2.6 – 3.0
U
3.3V
V
1
2
3
(0.004 – 0.008)
IN
LTC1772B 3.3V to 5V/1A Boost Regulator
I
GND
V
0.09 – 0.20
TH
(NOTE 2)
FB
Dimensions in inches (millimeters) unless otherwise noted.
/RUN
LTC1772B
SENSE
PGATE
L1: MURATA LQN6C-4R7
M1: Si9804
R1: DALE 0.25W
C1
47 F
16V
(0.00 – 0.006)
V
2
6-Lead Plastic SOT-23
(LTC DWG # 05-08-1634)
0.00 – 0.15
IN
–
6
5
4
SIX PLACES (NOTE 2)
S6 Package
(0.014 – 0.020)
2
0.35 – 0.50
U1
0.033
R1
5
3
4
U1: FAIRCHILD NC7SZ04
ALSO SEE LTC1872
FOR THIS APPLICATION
(0.035 – 0.057)
(0.035 – 0.051)
0.90 – 1.45
0.90 – 1.30
M1
L1
4.7 H
D1
COMMENTS
High Frequency, Small Inductor, High Efficiency
V
750kHz Optional Burst Mode Operation, 8-Lead MSOP
N-Channel Drive, 3.5V V
97% Efficiency, No Sense Resistor
Low Supply Voltage Range: 2.65V to 8V, I
No Need for 5V Supply, Uses Standard Logic Gate
MOSFETs; I
Two Channels; Minimum C
High Efficiency 5V to 3.3V Conversion at up to 15A
10 A Supply Current, 93% Efficiency,
1.23V V
With Burst Mode Operation for Higher Efficiency
at Light Load Current
2.65V V
2.5V V
IN
2V to 10V, I
+
(0.074)
1.90
REF
IN
C2
100 F
10V
OUT
IN
2
OUT
9.8V; 550kHz; 90% Efficiency
8.5V; 0.8V V
OUT
up to 15A
18V; 2.8V V
R2
422k
R3
80.6k
1772 TA03
Up to 4.5A, Synchronizable to
V
5V
1A
OUT
(0.037)
0.95
REF
(0.110 – 0.118)
2.80 – 3.00
(NOTE 3)
IN
LINEAR TECHNOLOGY CORPORATION 1999
IN
S6 SOT-23 0898
1772bf LT/TP 0201 4K • PRINTED IN USA
OUT
and C
IN
36V
20V
OUT
V
IN
; Current Mode; 550kHz
, I
OUT
OUT
up to 15A
= 0.5A