LTC1872 Datasheet, PDF (12/12 Pages) Linear Technology – Constant Frequency Current Mode Step-Up DC/DC Controller in SOT-23

LTC1872
TYPICAL APPLICATIO
LTC1872 – 2.5V to 3.3V/0.5A Boost Converter
10k
220pF
1
I_TH/RUN
5
V_IN
LTC1872
2
GND
SENSE^{– 4}
3
V_FB
6
NGATE
R1
0.034Ω
L1
4.7µH
M1 ^D1
C2
2× 100µF
10V
332k
V_OUT
3.3V
0.5A
0.1µF
CERAMIC
+ C1
100µF
10V
U1
V_IN
–2.5V
C1, C2: AVX TPSE107M010R0100
D1: MOTOROLA MBR2045CT
L1: COILTRONICS UP2B-4R7
M1: Si9804DV
R1: DALE 0.25W
U1: PANASONIC 2SB709A
80.6k
180k
1872 TA03
LTC1872 2.7V to 9.8V Input
to 3.3V/1.2A Output SEPIC Converter
C_C1
220pF
R_C1
10k ₁
I_TH/RUN
5
V_IN
R_f2
80.6k
LTC1872
2
GND
SENSE^{– 4}
3
V_FB
6
NGATE
R_f1
252k
R_CS
0.03Ω
L1A
L1B
+
D1
MBRM120
CS
4.7µF
10V
V_IN
C_IN
2.7V TO 9.8V
10µF
10V, X5R
C01
180µF
4V, SP
V_OUT
3.3V/1.2A
M1
C_IN, CS; TOKO, MURATA OR TAIYO YUDEN
C₀₁: PANASONIC EEFUE0G181R
L1: BH ELECTRONICS 511-1012
M1: IRLMS2002
R_CS: DALE OR IRC
1872 TA05
FOR V_OUT = 5V CHANGE
R_f1 TO 427kΩ AND
C₀₁ TO 150µF, 6V PANASONIC
SP TYPE CAPACITOR
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
2.6 – 3.0
(0.110 – 0.118)
1.50 – 1.75
(0.059 – 0.069)
S6 Package
6-Lead Plastic SOT-23
(LTC DWG # 05-08-1634)
0.00 – 0.15
(0.00 – 0.006)
0.90 – 1.45
(0.035 – 0.057)
2.80 – 3.00
(0.110 – 0.118)
(NOTE 3)
0.35 – 0.55
(0.014 – 0.022)
NOTE:
0.09 – 0.20
(0.004 – 0.008)
(NOTE 2)
0.35 – 0.50
(0.014 – 0.020)
SIX PLACES (NOTE 2)
0.90 – 1.30
(0.035 – 0.051) ^1.90
(0.074)
REF
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)
0.95
(0.037)
REF
S6 SOT-23 0898
RELATED PARTS
PART NUMBER
LT1304
LT1610
LT1613
LT1619
LT1680
LTC1624
LT1615
LTC1700
LTC1772
LTC3401/LTC3402
DESCRIPTION
Micropower DC/DC Converter with Low-Battery Detector
1.7MHz, Single Cell Micropower DC/DC Converter
1.4MHz, Single Cell DC/DC Converter in 5-Lead SOT-23
Low Voltage Current Mode PWM Controller
High Power DC/DC Step-Up Controller
High Efficiency SO-8 N-Channel Switching Regulator Controller
Micropower Step-Up DC/DC Converter in SOT-23
No R_SENSE Synchronous Current Mode DC/DC Step-Up Controller
Constant Frequency Current Mode Step-Down DC/DC Controller
1A/2A, 3MHz Micropower Synchronous Boost Converter
COMMENTS
120µA Quiescent Current, 1.5V ≤ V_IN ≤ 8V
30µA Quiescent Current, V_IN Down to 1V
Internally Compensated, V_IN Down to 1V
8-Lead MSOP Package, 1.9V ≤ V_IN ≤ 18V
Operation Up to 60V, Fixed Frequency Current Mode
8-Pin N-Channel Drive, 3.5V ≤ V_IN ≤ 36V
20µA Quiescent Current, V_IN Down to 1V
95% Efficient, 0.9V ≤ V_IN ≤ 5V, 550kHz Operation
V_IN 2.5V to 9.8V, I_OUT up to 4A, SOT-23 Package
10-Lead MSOP Package, 0.5V ≤ V_IN ≤ 5V
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^q FAX:[phone] ^q www.linear-tech.com
1872f LT/TP 0301 4K • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2000